Laboratory Experiment. Number 6 & 7
Heat Treatment and Hardenability of Steels
Laboratory Experiment No. 6 & 7
Heat Treatment and Hardenability of Steels
Abstract
This experiment is attempted to measure the hardenability of the steel and understand the process of heat treatment of different materials at different cooling strategies. Cooling through different procedures will cause the materials to have different properties and different microstructures. Furthermore next stage of experiment relates the cooling rate and hardness of 1045 steel and 4143 steel. This also helps in determine how alloying a material permits it to be heat treated more homogeneously. Investigated results also proven to be close enough to expected results in obtaining higher brittleness with rapid cooling in and to improve ductility the process of tempering is proven to be very efficient with increase of tempering temperature the hardness of material must be decrease. Last but not least, after finishing experiment 6 the group found out that the lower the tempering temperature the lower the hardness. Also, the results that the group found from experiment 7 after finishing it proved being inconsistent from what it should be.
Introduction
The purpose of this experiment is to determine what effect heat treating and then cooling has on the hardness and grain structure of two different types of steel. The two different types of steels were utilized are 1045 steel samples and 4143 steel sample which is considered to be a low-alloy steel.
The heat-treating process is a method to alter physical and mechanical properties of the material. The heat-treating process is consists of three crucial steps of annealing, hardening, and tempering. Annealing is primarily used to soften and to induce the ductility of the specimens by heating and holding at suitable temperature and then cooling, by instantly quenching in the water, which produces the higher brittleness with low ductility and toughness in the specimens. Moreover, tempering is a process of heat-treating, which is used to increase the toughness of metal. Tempering is important because it used to achieve desired hardness. To restore some the toughness and impact properties is obtained by tempering where specimens are reheated to a temperature between 5000 F and 10000 F for certain time which removes the internal strain caused by sudden cooling in the quenching bath without a large decrease in hardness or strength.
In attempting the first phase of the experiment it cannot determined why some heat-treated materials don’t reach a high hardness when cooled at certain temperature. With the hardness test the hardness of a material can be determined. The Hardenability is a property that determines the depth and distribution of hardness when steel is heated to a given temperature and then quenched to reach martensitic structure, which is obtained by performing Jominy test, where an austenitized steel bar is quenched at one end only, thu ...
Laboratory Experiment No. 6 & 7Heat Treatment and Hardenability .docxsmile790243
Laboratory Experiment No. 6 & 7
Heat Treatment and Hardenability of Steels
Abstract
This experiment is attempted to measure the hardenability of the steel and understand the process of heat treatment of different materials at different cooling strategies. Cooling through different procedures will cause the materials to have different properties and different microstructures. Furthermore next stage of experiment relates the cooling rate and hardness of 1045 steel and 4143 steel. This also helps in determine how alloying a material permits it to be heat treated more homogeneously. Investigated results also proven to be close enough to expected results in obtaining higher brittleness with rapid cooling in and to improve ductility the process of tempering is proven to be very efficient with increase of tempering temperature the hardness of material must be decrease. Last but not least, after finishing experiment 6 the group found out that the lower the tempering temperature the lower the hardness. Also, the results that the group found from experiment 7 after finishing it proved being inconsistent from what it should be.
Introduction
The purpose of this experiment is to determine what effect heat treating and then cooling has on the hardness and grain structure of two different types of steel. The two different types of steels were utilized are 1045 steel samples and 4143 steel sample which is considered to be a low-alloy steel.
The heat-treating process is a method to alter physical and mechanical properties of the material. The heat-treating process is consists of three crucial steps of annealing, hardening, and tempering. Annealing is primarily used to soften and to induce the ductility of the specimens by heating and holding at suitable temperature and then cooling, by instantly quenching in the water, which produces the higher brittleness with low ductility and toughness in the specimens. Moreover, tempering is a process of heat-treating, which is used to increase the toughness of metal. Tempering is important because it used to achieve desired hardness. To restore some the toughness and impact properties is obtained by tempering where specimens are reheated to a temperature between 5000 F and 10000 F for certain time which removes the internal strain caused by sudden cooling in the quenching bath without a large decrease in hardness or strength.
In attempting the first phase of the experiment it cannot determined why some heat-treated materials don’t reach a high hardness when cooled at certain temperature. With the hardness test the hardness of a material can be determined. The Hardenability is a property that determines the depth and distribution of hardness when steel is heated to a given temperature and then quenched to reach martensitic structure, which is obtained by performing Jominy test, where an austenitized steel bar is quenched at one end only, thus producing a range of cooling rates along the bar.
Procedure
First of all, th ...
Report and Analysis: Resulting Microstructures of Cooled Carbon SteelDeAndria Hardy
Report and Analysis of experiment which tested the mechanical properties and resulting microconstituents of carbon steel under various cooling conditions
Influence of Heat Treatment on Mechanical Properties of Aisi1040 SteelIOSR Journals
This investigation is concerned to evaluate the influence of heat treatment on mechanical behavior of AISI1040 steel; it is one of the grades of medium carbon steel of American standard containing 0.40% carbon in its composition. Specimen of quenched/hardened AISI1040 steel was tempered at temperature (650,450&250℃) for 60, 90&120 minutes to modify desired properties. The mechanical behavior, particularly, ultimate tensile strength, yield strength and elongation were investigated using universal testing machine; while the hardness measurement was done on Rockwell hardness testing machine of heat treated specimens. Result shows that the ultimate tensile strength and the yield strength decrease while the elongation increases with an increase in tempering temperature and tempering time of different tempered specimen. The hardness of quenched/hardened specimen decreases with an increase in tempering temperature and tempering time. Furthermore, increasing temperature and lowering time produces approximately same result as decreasing temperature and increasing time.
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Laboratory Experiment No. 6 & 7Heat Treatment and Hardenability .docxsmile790243
Laboratory Experiment No. 6 & 7
Heat Treatment and Hardenability of Steels
Abstract
This experiment is attempted to measure the hardenability of the steel and understand the process of heat treatment of different materials at different cooling strategies. Cooling through different procedures will cause the materials to have different properties and different microstructures. Furthermore next stage of experiment relates the cooling rate and hardness of 1045 steel and 4143 steel. This also helps in determine how alloying a material permits it to be heat treated more homogeneously. Investigated results also proven to be close enough to expected results in obtaining higher brittleness with rapid cooling in and to improve ductility the process of tempering is proven to be very efficient with increase of tempering temperature the hardness of material must be decrease. Last but not least, after finishing experiment 6 the group found out that the lower the tempering temperature the lower the hardness. Also, the results that the group found from experiment 7 after finishing it proved being inconsistent from what it should be.
Introduction
The purpose of this experiment is to determine what effect heat treating and then cooling has on the hardness and grain structure of two different types of steel. The two different types of steels were utilized are 1045 steel samples and 4143 steel sample which is considered to be a low-alloy steel.
The heat-treating process is a method to alter physical and mechanical properties of the material. The heat-treating process is consists of three crucial steps of annealing, hardening, and tempering. Annealing is primarily used to soften and to induce the ductility of the specimens by heating and holding at suitable temperature and then cooling, by instantly quenching in the water, which produces the higher brittleness with low ductility and toughness in the specimens. Moreover, tempering is a process of heat-treating, which is used to increase the toughness of metal. Tempering is important because it used to achieve desired hardness. To restore some the toughness and impact properties is obtained by tempering where specimens are reheated to a temperature between 5000 F and 10000 F for certain time which removes the internal strain caused by sudden cooling in the quenching bath without a large decrease in hardness or strength.
In attempting the first phase of the experiment it cannot determined why some heat-treated materials don’t reach a high hardness when cooled at certain temperature. With the hardness test the hardness of a material can be determined. The Hardenability is a property that determines the depth and distribution of hardness when steel is heated to a given temperature and then quenched to reach martensitic structure, which is obtained by performing Jominy test, where an austenitized steel bar is quenched at one end only, thus producing a range of cooling rates along the bar.
Procedure
First of all, th ...
Report and Analysis: Resulting Microstructures of Cooled Carbon SteelDeAndria Hardy
Report and Analysis of experiment which tested the mechanical properties and resulting microconstituents of carbon steel under various cooling conditions
Influence of Heat Treatment on Mechanical Properties of Aisi1040 SteelIOSR Journals
This investigation is concerned to evaluate the influence of heat treatment on mechanical behavior of AISI1040 steel; it is one of the grades of medium carbon steel of American standard containing 0.40% carbon in its composition. Specimen of quenched/hardened AISI1040 steel was tempered at temperature (650,450&250℃) for 60, 90&120 minutes to modify desired properties. The mechanical behavior, particularly, ultimate tensile strength, yield strength and elongation were investigated using universal testing machine; while the hardness measurement was done on Rockwell hardness testing machine of heat treated specimens. Result shows that the ultimate tensile strength and the yield strength decrease while the elongation increases with an increase in tempering temperature and tempering time of different tempered specimen. The hardness of quenched/hardened specimen decreases with an increase in tempering temperature and tempering time. Furthermore, increasing temperature and lowering time produces approximately same result as decreasing temperature and increasing time.
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Effect of Heat Treatment on Corrosion Behavior of Spring SteelsEditor IJCATR
The experimental work deals with the effect of heat treatment on the corrosion behaviour of spring steels. In this study the
heat treatments like hardening, normalizing and tempering were done for spring steels to obtain martensitic matrix, pearlitic structure
and tempered martensitic matrix respectively. After heat treatment the microstructural studies were carried out for the samples using
SEM. Hardness measurements were done. The corrosion behaviour of all heat treated samples in HCl at different concentration (1.5N,
2N and 2.5N) was determined using Tafel extrapolation technique. The variation in the corrosion rates due to the effect of heat
treatment was noted. The results indicate that for fully martensitic matrix the corrosion rate is minimum and for pearlitic structure its
maximum. As tempering time is increased the corrosion rate increases correspondingly. The corroded microstructural images were
also taken using SEM and analysed.
Effect of Subzero Treatment on Microstructure and Material Properties of EN...IJMER
Cryogenic treatment of steels has been widely used for enhancing mechanical properties
like hardness, toughness and stable metallurgical structure. Application such as gears, kicker rods,
bolts are made of medium carbon alloy steels like EN-24 steel. In these applications, percentage of
retained austenite has considerable effects on the life of the material. A comparative study on
conventionally heat-treated (CHT) and shallow cryogenic treated (SCT) EN-24 steel was done to
evaluate the effect of shallow cryogenic treatment (SCT) on hardness, toughness and the amount of
retained austenite present in the structure of EN24 steel. The microscopic structure of cryogenic
treated EN24 steel revealed the formation of carbides, both primary and secondary carbides. An
estimated amount of 15% retained austenite after CHT tempered condition was less than 2% after SCT
tempered condition. Tensile test fractography of subzero treated (SCT) specimen revealed ductile
fracture. The maximum hardness observed in case of SCT tempered samples was 415BHN, 15%
increase from CHT tempered samples. The maximum impact strength observed in case of SCT
tempered samples was 240kJ/m2, 11% increase from CHT tempered samples. Further SCT tempered
samples, tempered at 650°C resulted in ductility increase by 55% as compared to CHT tempered
samples without sacrificing hardness.
Experimental Investigation on Characteristic Study of the Carbon Steel C45 in...IJMER
In this paper, the mechanical characteristics of C45 medium carbon steel are investigated
under various working conditions. The main characteristic to be studied on this paper is impact toughness
of the material with different configurations and the experiment were carried out on charpy impact testing
equipment. This study reveals the ability of the material to absorb energy up to failure for various
specimen configurations under different heat treated conditions and the corresponding results were
compared with the analysis outcome
Analysis of mechanical properties of heat treated mild steelSaugata Chowdhury
The aim of this project was to make a comparison between the changes in mechanical properties of mild steel quenched in various quenching mediums namely Vegetable oil, Brine solution, NaOH solution and Super-quenchant. Mild-Steel specimens for hardness test, tensile test and impact test were prepared and heated upto the austenizing range of temperature. After holding at that temperature for the necessary sintering time, they were immediately quenched in the four mediums.
Upon carrying the various tests, it was observed that hardness of all the specimens increased at the expense of toughness. Further the rate of cooling influenced the hardness of the specimens. Specimens quenched in NaOH exhibited maximum increase in hardness and tensile strength of steel. Oil quenched steel showed rise in hardness and tensile strength with least decrease in toughness among the four mediums. Brine also improved the hardness and tensile strength but maximum reduction in toughness was encountered. Finally, superquenchant was found to be the best quenching medium with appreciable rise in the hardness and tensile strength at very less reduction in toughness.
Effect of Quenching Media on Mechanical Properties for Medium Carbon SteelIJERA Editor
In this research work the mechanical properties of medium carbon steel has been studied . the Steel AISI 1039
quenched in different quenching media. These quenching media were cold water, water , oil and hot water.
Hardness , tensile , impact and wear tests have been carried out for specimens after quenching in different
media.
It was found that the tensile strength and hardness increased with increasing the heating temperature values of
heat treatment process. Also quenching in cold water has a great effect on tensile strength and hardness values .
where the heights value for tensile strength was (998.6N/mm²) and the hardness was (360.4 Hv) for steel which
quenching in cold water. The percentage of elongation decreased with increasing the temperature of heat
treatment process. also the lowest values of elongation was after quenching process in cold water.
However, the impact toughness and wear rate values were high for alloy after stress relief and lower after
quenching in different media. But the lowest values were recorded after quenching in cold water. It was found
that the absorbed energy and the wear rate for the alloy quenched in cold water were (23.6) J and
(2x10¯⁷gm/cm) respectively. While, for steels treated with the stress relief process were (62.02) J and
(7x10¯⁷gm/cm) respectively.
Effect of Step Quenching and Tempering on the Corrosion Behaviour of a Low Ca...inventionjournals
The trust of this research is to critically examine the effect of step quenching and tempering on the corrosion performance of a low carbon steel in 0.1M HCl aqueous solution. The steel was first normalized at 850OC for 1 hour. This was followed by step quenching heat treatment, which involved austenitizing at 850OC followed by slow cooling in the furnace to and soaking at various temperatures in the (α + γ) region of 730OC, 750OC and 770OC for 30 minutes and then quenched in water. Some set of the samples were tempered for 1 hour at 320OC and air cooled. Samples were prepared for microscopic examination and corrosion performance evaluation from all the heat treatment procedures. The weight loss method was used to evaluate the corrosion rate. Volume fraction of martensite was measured for the as-quenched step quenched samples. From the results, it was observed that martensite volume fraction increased with increase in soaking temperature. The results also revealed that step quenching increases the susceptibility of the investigated steel to corrosion, while tempering the as-quenched step quenched steel reduces corrosion susceptibility. Hence, it was recommended that for applications of this material in chloride environment, tempering should always proceed step quenching.
Effect of Subzero Treatment on Microstructure and Material Properties of EN24...IJMER
Cryogenic treatment of steels has been widely used for enhancing mechanical properties
like hardness, toughness and stable metallurgical structure. Application such as gears, kicker rods,
bolts are made of medium carbon alloy steels like EN-24 steel. In these applications, percentage of
retained austenite has considerable effects on the life of the material. A comparative study on
conventionally heat-treated (CHT) and shallow cryogenic treated (SCT) EN-24 steel was done to
evaluate the effect of shallow cryogenic treatment (SCT) on hardness, toughness and the amount of
retained austenite present in the structure of EN24 steel. The microscopic structure of cryogenic
treated EN24 steel revealed the formation of carbides, both primary and secondary carbides. An
estimated amount of 15% retained austenite after CHT tempered condition was less than 2% after SCT
tempered condition. Tensile test fractography of subzero treated (SCT) specimen revealed ductile
fracture. The maximum hardness observed in case of SCT tempered samples was 415BHN, 15%
increase from CHT tempered samples. The maximum impact strength observed in case of SCT
tempered samples was 240kJ/m2, 11% increase from CHT tempered samples. Further SCT tempered
samples, tempered at 650°C resulted in ductility increase by 55% as compared to CHT tempered
samples without sacrificing hardness
Steel 4140
Left
Middle
Right
AVG
Hardness (HRA)
42.7
48.4
45.2
45.4
Diameter (in.)
0.996
0.994
0.995
0.995
Steel 1410
Left
Middle
Right
AVG
Hardness (HRA)
46.7
44.4
51.8
47.6
Diameter (in.)
0.994
0.995
0.995
0.995
Steel 1410 Rockwell A (HRA) Measurements
Every 1/16 inch for 1 inch
Every 1/8 inch for 1 inch
Every 1/4 inch for 2 inches
1
23.0
45.9
41.9
2
45.7
47.1
42.0
3
47.8
46.6
40.9
4
46.0
44.9
29.5
5
46.0
46.7
32.7
6
45.1
47.5
42.5
7
47.1
45.3
43.0
8
46.9
43.3
21.8
9
45.2
10
47.7
11
47.8
12
46.9
13
46.8
14
55.8
15
45.9
16
46.6
Steel 4140 Rockwell A (HRA) Measurements
Every 1/16 inch for 1 inch
Every 1/8 inch for 1 inch
Every 1/4 inch for 2 inches
1
69.8
60.3
57.5
2
73.2
61.4
55.4
3
72.2
59.4
51.2
4
72.4
60.1
57.7
5
72.0
58.1
53.2
6
73.2
58.3
72.5
7
73.1
59.7
64.2
8
72.0
58.7
63.7
9
70.5
10
69.1
11
67.7
12
67.4
13
65.4
14
63.2
15
62.1
16
63.2
EXPERIMENT 6
HEAT TREATMENT OF STEEL
Purpose
The purposes of this experiment are to:
Investigate the processes of heat treating of steel
Study hardness testing and its limits
Examine microstructures of steel in relation to hardness
Background
To understand heat treatment of steels requires an ability to understand the Fe-C phase
diagram shown in Figure 6-1. Steel with a 0.78 wt% C is said to be a eutectoid steel. Steel
with carbon content less than 0.78 wt% C is hypoeutectoid and greater than 0.78 wt% C is
hypereutectoid. The region marked austenite is face-centered-cubic (FCC) and ferrite is
body-centered-cubic (BCC).
There are also regions that have two phases. If one cools a hypoeutectoid steel from a point in
the austenite region, reaching the A3 line, ferrite will form from the austenite. This ferrite is
called proeutectoid ferrite. When A1 is reached, a mixture of ferrite and iron carbide
(cementite) forms from the remaining austenite. The microstructure of a hypoeutectoid steel
upon cooling would contain proeutectoid ferrite plus pearlite (+ Fe3C).
The size, type and distribution of phases present can be altered by not waiting for
thermodynamic equilibrium. Steels are often cooled so rapidly that metastable phases appear.
One such phase is martensite, which is a body-centered tetragonal (BCT) phase and forms
only by very rapid cooling.
Much of the information on non-equilibrium distribution, size and type of phases has come
from experiments. The results are presented in a time-temperature-transformation (TTT)
diagram shown in Figure 6-2. As a sample is cooled, the temperature will decrease as shown
in curve #1. At point A, pearlite (a mixture of ferrite and cementite) will start to form from
austenite. At the time and temperature associated with point B, the austenite will have
completely transformed to pearlite. There are many possible paths through the pearlite
regions. Slower cooling causes coarse Pearlite, while fast cooling causes fine pearlite to form.
.
International Journal of Engineering Research and DevelopmentIJERD Editor
Electrical, Electronics and Computer Engineering,
Information Engineering and Technology,
Mechanical, Industrial and Manufacturing Engineering,
Automation and Mechatronics Engineering,
Material and Chemical Engineering,
Civil and Architecture Engineering,
Biotechnology and Bio Engineering,
Environmental Engineering,
Petroleum and Mining Engineering,
Marine and Agriculture engineering,
Aerospace Engineering.
Effect of Hardness and Wear Resistance on En 353 Steel by Heat Treatment IJMER
En 353 steel is an easily available and cheap material that is acceptable for heavy duty
applications. Heat treatment on En 353 steel is improved the ductility, toughness, strength, hardness and
relive internal stress in the material. Spectrographic method is used to analyze the composition of the
alloy material. The experimental results of hardness and dry wear testing on pin-on-disc are done to get
idea about heat treated En 353 steel. It is found that the hardness and wear resistance of the En 353 steel
is improved after the heat treatment and the microstructure is changed from ferrite to martensite.
please write a short essay to address the following questions. Lengt.docxDIPESH30
please write a short essay to address the following questions. Length: 500 word count to the minimum.
“Blogs, Twitter, Facebook, and a host of other news and social-media sites have allowed average citizens to become newsmakers. Is this a good or bad thing? Is the increase in citizen journalism leading to inaccuracies in reporting? Or can we trust that Americans will “consider the source” and verify any questionable information they read on a blog?”
Requirements:
1.Word count: 500.
2.Submissions must be in Word format (doc, docx) or Rich Text format (rtf). Attached file sent to my email will not be graded.
3.VeriCite has been activated to prevent plagiarism and no credit will be issued if Similarity Index points to 20% or higher.
.
please write a diary entry from the perspective of a French Revoluti.docxDIPESH30
please write a diary entry from the perspective of a French Revolutionary of the Third Estate (bourgeoisie, worker, or peasant), a member of the First Estate (clergy) or a member of the Second Estate (nobles). Your entry should have a well established mood, or writing that evokes certain feelings or emotions in readers through words and descriptions. Some examples of mood through setting, diction, and tone can be found
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In addition, your journal should incorporate at least
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estate (First, Second, Third)
The Enlightenment
Great Fear
.
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Effect of Heat Treatment on Corrosion Behavior of Spring SteelsEditor IJCATR
The experimental work deals with the effect of heat treatment on the corrosion behaviour of spring steels. In this study the
heat treatments like hardening, normalizing and tempering were done for spring steels to obtain martensitic matrix, pearlitic structure
and tempered martensitic matrix respectively. After heat treatment the microstructural studies were carried out for the samples using
SEM. Hardness measurements were done. The corrosion behaviour of all heat treated samples in HCl at different concentration (1.5N,
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Effect of Subzero Treatment on Microstructure and Material Properties of EN...IJMER
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like hardness, toughness and stable metallurgical structure. Application such as gears, kicker rods,
bolts are made of medium carbon alloy steels like EN-24 steel. In these applications, percentage of
retained austenite has considerable effects on the life of the material. A comparative study on
conventionally heat-treated (CHT) and shallow cryogenic treated (SCT) EN-24 steel was done to
evaluate the effect of shallow cryogenic treatment (SCT) on hardness, toughness and the amount of
retained austenite present in the structure of EN24 steel. The microscopic structure of cryogenic
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under various working conditions. The main characteristic to be studied on this paper is impact toughness
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specimen configurations under different heat treated conditions and the corresponding results were
compared with the analysis outcome
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The aim of this project was to make a comparison between the changes in mechanical properties of mild steel quenched in various quenching mediums namely Vegetable oil, Brine solution, NaOH solution and Super-quenchant. Mild-Steel specimens for hardness test, tensile test and impact test were prepared and heated upto the austenizing range of temperature. After holding at that temperature for the necessary sintering time, they were immediately quenched in the four mediums.
Upon carrying the various tests, it was observed that hardness of all the specimens increased at the expense of toughness. Further the rate of cooling influenced the hardness of the specimens. Specimens quenched in NaOH exhibited maximum increase in hardness and tensile strength of steel. Oil quenched steel showed rise in hardness and tensile strength with least decrease in toughness among the four mediums. Brine also improved the hardness and tensile strength but maximum reduction in toughness was encountered. Finally, superquenchant was found to be the best quenching medium with appreciable rise in the hardness and tensile strength at very less reduction in toughness.
Effect of Quenching Media on Mechanical Properties for Medium Carbon SteelIJERA Editor
In this research work the mechanical properties of medium carbon steel has been studied . the Steel AISI 1039
quenched in different quenching media. These quenching media were cold water, water , oil and hot water.
Hardness , tensile , impact and wear tests have been carried out for specimens after quenching in different
media.
It was found that the tensile strength and hardness increased with increasing the heating temperature values of
heat treatment process. Also quenching in cold water has a great effect on tensile strength and hardness values .
where the heights value for tensile strength was (998.6N/mm²) and the hardness was (360.4 Hv) for steel which
quenching in cold water. The percentage of elongation decreased with increasing the temperature of heat
treatment process. also the lowest values of elongation was after quenching process in cold water.
However, the impact toughness and wear rate values were high for alloy after stress relief and lower after
quenching in different media. But the lowest values were recorded after quenching in cold water. It was found
that the absorbed energy and the wear rate for the alloy quenched in cold water were (23.6) J and
(2x10¯⁷gm/cm) respectively. While, for steels treated with the stress relief process were (62.02) J and
(7x10¯⁷gm/cm) respectively.
Effect of Step Quenching and Tempering on the Corrosion Behaviour of a Low Ca...inventionjournals
The trust of this research is to critically examine the effect of step quenching and tempering on the corrosion performance of a low carbon steel in 0.1M HCl aqueous solution. The steel was first normalized at 850OC for 1 hour. This was followed by step quenching heat treatment, which involved austenitizing at 850OC followed by slow cooling in the furnace to and soaking at various temperatures in the (α + γ) region of 730OC, 750OC and 770OC for 30 minutes and then quenched in water. Some set of the samples were tempered for 1 hour at 320OC and air cooled. Samples were prepared for microscopic examination and corrosion performance evaluation from all the heat treatment procedures. The weight loss method was used to evaluate the corrosion rate. Volume fraction of martensite was measured for the as-quenched step quenched samples. From the results, it was observed that martensite volume fraction increased with increase in soaking temperature. The results also revealed that step quenching increases the susceptibility of the investigated steel to corrosion, while tempering the as-quenched step quenched steel reduces corrosion susceptibility. Hence, it was recommended that for applications of this material in chloride environment, tempering should always proceed step quenching.
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Cryogenic treatment of steels has been widely used for enhancing mechanical properties
like hardness, toughness and stable metallurgical structure. Application such as gears, kicker rods,
bolts are made of medium carbon alloy steels like EN-24 steel. In these applications, percentage of
retained austenite has considerable effects on the life of the material. A comparative study on
conventionally heat-treated (CHT) and shallow cryogenic treated (SCT) EN-24 steel was done to
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fracture. The maximum hardness observed in case of SCT tempered samples was 415BHN, 15%
increase from CHT tempered samples. The maximum impact strength observed in case of SCT
tempered samples was 240kJ/m2, 11% increase from CHT tempered samples. Further SCT tempered
samples, tempered at 650°C resulted in ductility increase by 55% as compared to CHT tempered
samples without sacrificing hardness
Steel 4140
Left
Middle
Right
AVG
Hardness (HRA)
42.7
48.4
45.2
45.4
Diameter (in.)
0.996
0.994
0.995
0.995
Steel 1410
Left
Middle
Right
AVG
Hardness (HRA)
46.7
44.4
51.8
47.6
Diameter (in.)
0.994
0.995
0.995
0.995
Steel 1410 Rockwell A (HRA) Measurements
Every 1/16 inch for 1 inch
Every 1/8 inch for 1 inch
Every 1/4 inch for 2 inches
1
23.0
45.9
41.9
2
45.7
47.1
42.0
3
47.8
46.6
40.9
4
46.0
44.9
29.5
5
46.0
46.7
32.7
6
45.1
47.5
42.5
7
47.1
45.3
43.0
8
46.9
43.3
21.8
9
45.2
10
47.7
11
47.8
12
46.9
13
46.8
14
55.8
15
45.9
16
46.6
Steel 4140 Rockwell A (HRA) Measurements
Every 1/16 inch for 1 inch
Every 1/8 inch for 1 inch
Every 1/4 inch for 2 inches
1
69.8
60.3
57.5
2
73.2
61.4
55.4
3
72.2
59.4
51.2
4
72.4
60.1
57.7
5
72.0
58.1
53.2
6
73.2
58.3
72.5
7
73.1
59.7
64.2
8
72.0
58.7
63.7
9
70.5
10
69.1
11
67.7
12
67.4
13
65.4
14
63.2
15
62.1
16
63.2
EXPERIMENT 6
HEAT TREATMENT OF STEEL
Purpose
The purposes of this experiment are to:
Investigate the processes of heat treating of steel
Study hardness testing and its limits
Examine microstructures of steel in relation to hardness
Background
To understand heat treatment of steels requires an ability to understand the Fe-C phase
diagram shown in Figure 6-1. Steel with a 0.78 wt% C is said to be a eutectoid steel. Steel
with carbon content less than 0.78 wt% C is hypoeutectoid and greater than 0.78 wt% C is
hypereutectoid. The region marked austenite is face-centered-cubic (FCC) and ferrite is
body-centered-cubic (BCC).
There are also regions that have two phases. If one cools a hypoeutectoid steel from a point in
the austenite region, reaching the A3 line, ferrite will form from the austenite. This ferrite is
called proeutectoid ferrite. When A1 is reached, a mixture of ferrite and iron carbide
(cementite) forms from the remaining austenite. The microstructure of a hypoeutectoid steel
upon cooling would contain proeutectoid ferrite plus pearlite (+ Fe3C).
The size, type and distribution of phases present can be altered by not waiting for
thermodynamic equilibrium. Steels are often cooled so rapidly that metastable phases appear.
One such phase is martensite, which is a body-centered tetragonal (BCT) phase and forms
only by very rapid cooling.
Much of the information on non-equilibrium distribution, size and type of phases has come
from experiments. The results are presented in a time-temperature-transformation (TTT)
diagram shown in Figure 6-2. As a sample is cooled, the temperature will decrease as shown
in curve #1. At point A, pearlite (a mixture of ferrite and cementite) will start to form from
austenite. At the time and temperature associated with point B, the austenite will have
completely transformed to pearlite. There are many possible paths through the pearlite
regions. Slower cooling causes coarse Pearlite, while fast cooling causes fine pearlite to form.
.
International Journal of Engineering Research and DevelopmentIJERD Editor
Electrical, Electronics and Computer Engineering,
Information Engineering and Technology,
Mechanical, Industrial and Manufacturing Engineering,
Automation and Mechatronics Engineering,
Material and Chemical Engineering,
Civil and Architecture Engineering,
Biotechnology and Bio Engineering,
Environmental Engineering,
Petroleum and Mining Engineering,
Marine and Agriculture engineering,
Aerospace Engineering.
Effect of Hardness and Wear Resistance on En 353 Steel by Heat Treatment IJMER
En 353 steel is an easily available and cheap material that is acceptable for heavy duty
applications. Heat treatment on En 353 steel is improved the ductility, toughness, strength, hardness and
relive internal stress in the material. Spectrographic method is used to analyze the composition of the
alloy material. The experimental results of hardness and dry wear testing on pin-on-disc are done to get
idea about heat treated En 353 steel. It is found that the hardness and wear resistance of the En 353 steel
is improved after the heat treatment and the microstructure is changed from ferrite to martensite.
please write a short essay to address the following questions. Lengt.docxDIPESH30
please write a short essay to address the following questions. Length: 500 word count to the minimum.
“Blogs, Twitter, Facebook, and a host of other news and social-media sites have allowed average citizens to become newsmakers. Is this a good or bad thing? Is the increase in citizen journalism leading to inaccuracies in reporting? Or can we trust that Americans will “consider the source” and verify any questionable information they read on a blog?”
Requirements:
1.Word count: 500.
2.Submissions must be in Word format (doc, docx) or Rich Text format (rtf). Attached file sent to my email will not be graded.
3.VeriCite has been activated to prevent plagiarism and no credit will be issued if Similarity Index points to 20% or higher.
.
please write a diary entry from the perspective of a French Revoluti.docxDIPESH30
please write a diary entry from the perspective of a French Revolutionary of the Third Estate (bourgeoisie, worker, or peasant), a member of the First Estate (clergy) or a member of the Second Estate (nobles). Your entry should have a well established mood, or writing that evokes certain feelings or emotions in readers through words and descriptions. Some examples of mood through setting, diction, and tone can be found
HERE
.
In addition, your journal should incorporate at least
THREE
of the following vocabulary terms:
Louis XVI
Estates-General
National Assembly
Tennis Court Oath
estate (First, Second, Third)
The Enlightenment
Great Fear
.
Please write the definition for these words and provide .docxDIPESH30
Please write the definition for these words and
provide two
examples
for each one
The definition should relate to “linguistic form“ / grammar
See attached file. you have
three hours and an half
to do the assignemnt
.
Please view the filmThomas A. Edison Father of Invention, A .docxDIPESH30
Please view the film:
Thomas A. Edison: Father of Invention
, A & E Television (New York, NY: A & E Television Networks, 1996); Available on the Hagerty Library catalogue at: http://records.library.drexel.edu/record=b2133926~S9
And discuss:
Edison is portrayed rather herocially in this film, what would you do to present a more balanced view of Edison the man and inventor? Based on my lecture, discuss why or why not Edison should be considered the creator of the light bulb?
.
Please watch the clip from the movie The Break Up. Then reflect w.docxDIPESH30
Please watch the clip from the movie "The Break Up." Then reflect who you think is most at fault and why.
Then I would you like to think about a conflict you have had and think about what could have been done differently to resolve it.
Write a one page paper (double spaced)
https://www.youtube.com/watch?v=_bqhVqTuFO4
.
please write a report on Social Media and ERP SystemReport should.docxDIPESH30
please write a report on Social Media and ERP System:
Report should be a detail study on social media, effects of social media on business.Use of ERP Systems in social media and its benefits.During presentatio the students should present the use of ERP Systems in the social media aspect.
pages: 15
font size: 11
spaces: 1.5
please see attached file
due date tomorrow, within 24 hour
.
Please write 200 wordsHow has the healthcare delivery system chang.docxDIPESH30
Please write 200 words
How has the healthcare delivery system changed?
For what types of patients and what types of care does each of the systems deliver? Would a patient have a need for more than one system? When (give examples and explain)?
What are the regulations related to the medical staff? What purpose do these regulations serve?
.
Please view the documentary on Typhoid Mary at httpswww..docxDIPESH30
Please view the documentary on Typhoid Mary at:
https
://
www
.
youtube
.com/watch?v=
Mc
8O9
EnAuLo
And read:
- Priscilla Wald, “Cultures and Carriers: "Typhoid Mary" and the Science of Social Control,”
Social Text
, No. 52/53,
Queer
Transexions
of Race, Nation, and Gender
(Autumn - Winter, 1997), pp. 181-214; Available in the Readings Folder and on JSTOR at:
http
://
www
.
jstor
.
org
/stable/466739
Then discuss:
Wald discusses how the concept of "social control" relates or is exemplified by the Mary
Mallon
ca
se
. Choose one of the aspects of Wald's argument and discuss how it relates to the Typhoid Mary documentary. Do these help us understand the significance the 'Typhoid Mary' case has for the history of medicine, or for the treatment of epidemics today?
.
Please use the two attachments posted to complete work. Detailed in.docxDIPESH30
Please use the two attachments posted to complete work. Detailed instructions, notes / additional information, links and some resources are listed therein.
#1. Discussion due Thursday 12/11/14 Noon
#2. Paper due Saturday 12/13/14 Noon
******12/11/14 Edit to add additional research sources for you if need for part2 of assignment.
Davidson, W. H. (1979). FACTOR ENDOWMENT, INNOVATION AND INTERNATIONAL TRADE THEORY.
Kyklos
,
32
(4), 764.
Handlin, A. H. (2011).
Government Grief : How to Help Your Small Business Survive Mindless Regulation, Political Corruption and Red Tape
. Santa Barbara, Calif: Praeger.
Warren, R. C. (2003). The evolution of business legitimacy.
European Business Review,
15
(3), 153. Retrieved from http://search.proquest.com/docview/225421529?accountid=8289
.
Please use the sources in the outline (see photos)The research.docxDIPESH30
Please use the sources in the outline (see photos)
The research essay is to be 12 pages, typed, double-spaced. 10-12 sources are to be used. It is to be on a social policy area and may focus on Canada, or Canada in comparative perspective.
1.
Discuss the National Child Benefit, introduced in 1997. Has this measure been effective in reducing child poverty? Can this measure be seen as the further extension of neoliberalism, or as a new form of state-provided social investment?
Please make a clear and wordy thesis (highlight this in red) use notions of this thesis throughout the paper please. Clear and concise english as this is a university level paper.
Please include your own ideas as well as recommendations.
if a point is made please provide proof with the sources or readings
Please use APA FORMAT.
Please ensure that the paper follows the format suggested in the outline.
.
Please submit a minimum of five (5) detailed and discussion-provokin.docxDIPESH30
Please submit a minimum of five (5) detailed and discussion-provoking questions based on the recent reading assignments, video clips and the other websites assigned.
Only complete questions will earn credit. Therefore, it is important for you to think carefully about formulating the kinds of questions intended to stimulate conversations. Ask detailed and specific, rather than broad, general questions. Do not ask, for example, ‘When was the first Mission established in California?’ Instead, ask something like ‘What is the ideological agenda behind maintaining figures like Father Junipero Serra as heroic in California textbooks?’
Other examples include:
Does recent news media coverage of the “riots” in Baltimore, Ferguson and other cities promote a message that is pro-police? If not, how does it engender understanding of the root causes of many of the frustrations of local residents?
In the film “Banned in Arizona,” why does Superintendent Tom Horne argue in favor of “individualism” and why does he say that the Mexican American Studies program encourages radical thinking? What, if anything, is radical about the way those courses teach students in Tucson, Arizona?
If the U.S. reinstated a Vietnam War era-like military draft instead of relying upon the current all-volunteer force, would current public support for war change at all? If so, how?
Please consider these guidelines in composing your questions:
1. Make certain to ask at least one question from each source.
2. Ask questions about things that interest you.
3. Write your questions as though you were asking them to the entire class.
4. Be sure to make specific reference to the readings in each question. Many good questions require at least two sentences.
5. Try and use the questions to critique the author's opinion.
6. These homework questions should attempt to raise larger issues and---when possible---to relate the readings to issues in our current world.
"This week, I want us to think about the concept of
bias
, and its application in the places we consume information. This is tricky territory because even the very presentation of this unit is fraught with bias—my personal bias, or frame of reference. I’m going to ask you to read a collection of articles that I think are important, but they all clearly have a perspective and an agenda that comes from a particular worldview. So let’s get that out in the open. Maybe nothing in your liberal arts education is free from bias, but that does not mean we shy away from considering the information, ideas, arguments and critiques.
What is bias? For the purposes of our consideration, bias is really just about a set of values that can color or distort fair judgment. We can sometimes recognize obvious bias in others, especially when people use overtly discriminatory or offensive language, or have a clear political or ideological perspective that makes everything they present go through that lens. But more than anything else, I want us to think a.
Please think about the various learning activities you engaged in du.docxDIPESH30
Please think about the various learning activities you engaged in during this unit.
write one page summarizing the following:
Multiculturalism plays an important role in many schools today.
How can this be incorporated into everyday lessons related to health, safety, and nutrition?
How has your school (or your children’s school) incorporated multiculturalism into their lesson?
.
Please type out the question and answer it underneath. Each question.docxDIPESH30
Please type out the question and answer it underneath. Each question should be about a page long DOUBLE SPACED and cited.
Please use the articles that I PROVIDE!
Due date is this Sunday the 14th.
First two articles answer the questions 1 & 2 , the last article answers question 3
PLEASE FOLLOW INSTRUCTIONS
.
Please use the following technique-Outline the legal issues t.docxDIPESH30
Please use the following technique:
-
Outline the legal issues that you are going to discuss in your answer
-
Define the legal rules that are relevant to the question
-
Apply the legal rules to the facts of the question
-
Formulate a decision of which party should be successful
The use of headings for each relationship discussed is suggested.
Application of legal principles to the facts is the most important and often the hardest step. I am more interested in how you arrived at your answer, than the actual conclusions that you draw. Having said that, the “kitchen sink approach” is not suggested – i.e. spilling all of your knowledge that is vaguely related to the issue raised into your answer.
Please do not simply say, “Andrew is liable for negligence.” You must go through the analysis for why or why not a particular tort claim will be successful.
Use the language of the question.
Be as comprehensive and thorough as possible when responding to each issue – canvas all possible answers. If you have considered the application of a particular contractual concept, but after analysis, you have decided that it is not applicable, please go through your analysis.
If any possible remedies are available to either party, please identify with supporting reasons.
Assume for each relationship that the matter is being litigated in court,
not
through alternative dispute resolution.
DUE: TUESDAY MARCH 24
th
, 2015 at beginning of class
No midterms will be accepted after this date.
Tort Law Problem
Andrew Black is the owner of Confederation Mall (“Mall”) located in New Minas, Nova Scotia. Mr. Black leases out many retail spaces in the Mall to a wide range of businesses. He prides himself as a local success story. The people of New Minas truly admire his entrepreneurial success.
George Orange, owner of Guppy World, a pet fish store, has been a long-time tenant of Confederation Mall. Colin and Darren work for Mr. Orange. Colin was repairing a ceiling fan when he asked Darren to toss him a screwdriver, as Colin was up on a step-ladder at the time. Darren, standing 15 feet away, underhand tosses the screwdriver to Colin. Darren overshoots the toss and the screwdriver shatters a glass fish tank containing a piranha fish. At the same time a customer, Sally, was walking towards the check-out to purchase fish food, when she slipped on the water from the broken tank, fell to the floor and fractured her wrist. She is also bitten on the ankle by the piranha. When Mr. Orange tried to assist Sally, he smelled a strong smell of alcoholic beverage coming from her mouth. Colin noted that Sally appeared to be staggering slightly before falling.
Sally was transported to the hospital by paramedics. The doctor determines that Sally’s foot needs to be amputated due to the piranha bite and she needs to wear a cast on her wrist for 6-8 weeks due to the fracture.
Word of the piranha bite spreads like wild fire throughout the Mall. Evelyn, who suff.
Please use from these stratagies This homework will be to copyies .docxDIPESH30
Please use from these stratagies
This homework will be to copyies with different stratgies !!11
Rubrics
Revising Reading
RAFT
Quick write
Learning loge
KAMAL
Gallery walks
Data charts
All about book
Cubing Clusters Authors chair
Words Walks
.
PLEASE THOROUGHLY ANSWER THE FOLLOWING FIVE QUESTIONS BELOW IN.docxDIPESH30
PLEASE THOROUGHLY ANSWER THE FOLLOWING
FIVE
QUESTIONS BELOW IN A 500 Word Count Discussion
Contrast the dynamics between dominant cultures and subcultures either in a work setting or in society.
Explain why it is important to understand the impact of culture.
Give an example where you demonstrated your awareness and or openness to understanding a cultural difference.
Explain how these differences underscore the need for understanding diversity.
From the information given, develop guidelines for embracing diversity.
YOU MUST USE ONE CITED SCHOLARLY SOURCE. PROPERLY CITED IN APA FORM WITH AN REFERENCE PAGE ON THE BOTTOM. DO NOT USE WIKIPEDIA, THESAURUS, OR ENCYCLOPEDIA (THESE ARE NOT CITED SCHOLARLY SOURCES)
DO NOT TURN IN A PLAGIARIZED PAPER, WE WILL REPORT YOU.....
THIS PAPER IS DUE TODAY 12/11/2014.... 8 HOURS FROM NOW MAX NO LATER....SERIOUS INQUIRIES ONLY...DO NOT TAKE THIS PAPER IF YOU DO NOT KNOW THE TOPIC.....
.
Please share your thoughts about how well your employer, military .docxDIPESH30
Please share your thoughts about how well your employer, military base, or home responds to environmental concerns. Provide examples of some types.
1.
Issue 4
-
Re-Wilding
a. Explain what re-wilding is and how it became an issue.
b. Outline and discuss three main areas of disagreement between Josh Donlan and Rubenstein et al.
c. Which side do you agree with? Explain your answer.
Your response should be at least 200 words in length. All sources used, must be referenced; paraphrased and quoted material must have accompanying citations.
Put citation under each answer please
1.
Issue 5
-
Military Training and the Environment
a. Explain the history of military training and the environment.
b. Outline and discuss three main areas of disagreement between Benedict Cohen and Jamie Clark.
c. Which side do you agree with? Explain your answer.
Your response should be at least 200 words in length.
All sources used, must be referenced; paraphrased and quoted material must have accompanying citations.
Put citation under each answer please
1.
Issue 6
-
Carbon Emission Restrictions
a. Explain the history of carbon emissions and why the debate over carbon emissions exists.
b. Outline and discuss three main areas of disagreement between Paul Cicio and Eileen Claussen.
c. Which side do you agree with? Explain your answer.
Your response should be at least 200 words in length. All sources used, must be referenced; paraphrased and quoted material must have accompanying citations.
Put citation under each answer please
1.
Explain in your own words the Section 2017 initiative which Jamie Clark describes on. Then describe how you think Benedict Cohen would respond to Jamie Clark's presentation of Section 2017. Your response should be at least 200 words in length. as source material for your response. All sources used, must be referenced; paraphrased and quoted material must have accompanying citations.
Put citation under each answer please
Explain carbon trading, carbon offsets, and cap and trade. How are each similar? How are each different? Your response should be at least 200 words in length. as source material for your response. All sources used, , must be referenced; paraphrased and quoted material must have accompanying citations.
Put citation under each answer please
.
Please select and answer one of the following topics in a well-org.docxDIPESH30
Please select and answer one of the following topics in a well-organized and thoughtful paper (a minimum of 10 pages in
length). Your paper must contain at least five references in addition to the text. CSU requires that students use the APA
style for papers and projects. Therefore, the APA rules for formatting, quoting, paraphrasing, citing, and listing of sources
are to be followed.
1. If your employer's EMS is registered to ISO 14000, review the registration process. What were the most
difficult implementation activities? How long did it take? How easy was it to get worker buy-in and
participation? Cost? Others.
.
Please see the attachment for the actual work that is require. This.docxDIPESH30
Please see the attachment for the actual work that is require. This will be due on Sunday Nov 9, 2014.
THIS ISTHE CASE STUDY ATTACHED IS THE DIRECTIONS ON OW TO COMPLETE THE TASK.
Case Study Analysis
When it comes to planning events how many of us take the proper steps and put in the time and how many of us wait till the last minute to plan our event? What's the outcome of an event that has had the proper planning? Usually, a properly planned event is a huge success, and people leave-taking away information that will help them either improve, grow as a person or be successful at their job. People who try to plan events without taking the proper steps find themselves running into many problems along the way. Before they know it, they are out of time to fix any issues or problems that arise. Running out of time can lead to frustration, panic, and eventually the thought of “what am I going to do". Even though the steps to planning an event can be time-consuming, proper planning can ease frustration and anxiety, and lead to a successful event. Proper planning can eliminate the “What am I going to do” question.
Background
In the case study, Carl Robins did not plan for his event very well. He hired 15 new trainees and wanted to schedule a new hire orientation on June 15
th
. His goal was to have the new hires working by July. Carl had only been at his job for six months, and this was his first recruitment effort, so it is crucial for this event to work in Carl’s favor. Carl was contacted by Monica Carrolls, the soon to be Supervisor of the new hires, on May 15
th
. Monica was following up with Carl on how the planning for his orientation was going. She asked him about physicals, drug tests, the training schedule, orientation, manuals, and policy booklets. Carl told Monica that everything would be fine and ready to go in time for orientation. After Memorial Day, Carl finally decided to start planning for his event. Unfortunately; because Carl did not do any planning after hiring the fifteen new trainees and waited till the last minute to plan his event, he ran into multiple problems. When Carl finally decided to start planning for his event, he found that the training room where he was going to hold his orientation was booked for the whole month of June by a fellow associate named Joe. Joe was from technology services and needed the room for computer terminals. When he went to finalize the paperwork for his event, he found that some of the new hire trainees did not have completed transcripts or applications on file; nor had they gone to the clinic for their physicals and mandatory drug screenings. He then checked the orientation manuals and found that there were only three and that those three had missing pages. By now, Carl is very concerned, his anxiety is at a level high, and he is so frustrated that he sits with his head on his desk with the thought of “What am I going to do”.
Alternatives
At this point, Carl can .
Please see the attachment and look over the LOOK HERE FIRST file b.docxDIPESH30
Please see the attachment and look over the "LOOK HERE FIRST" file before handshaking to make sure you're committed to the assignment. Everything you need is within the zip folder attached. Thanks in advance. I had someone working on this and then they stopped answering me. Please don't be that person.
.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
Embracing GenAI - A Strategic ImperativePeter Windle
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Laboratory Experiment. Number 6 & 7Heat Treatment and Hardenabil.docx
1. Laboratory Experiment. Number 6 & 7
Heat Treatment and Hardenability of Steels
Laboratory Experiment No. 6 & 7
Heat Treatment and Hardenability of Steels
Abstract
This experiment is attempted to measure the hardenability of the
steel and understand the process of heat treatment of different
materials at different cooling strategies. Cooling through
different procedures will cause the materials to have different
properties and different microstructures. Furthermore next stage
of experiment relates the cooling rate and hardness of 1045
steel and 4143 steel. This also helps in determine how alloying
a material permits it to be heat treated more homogeneously.
Investigated results also proven to be close enough to expected
results in obtaining higher brittleness with rapid cooling in and
to improve ductility the process of tempering is proven to be
very efficient with increase of tempering temperature the
hardness of material must be decrease. Last but not least, after
finishing experiment 6 the group found out that the lower the
tempering temperature the lower the hardness. Also, the results
that the group found from experiment 7 after finishing it proved
being inconsistent from what it should be.
Introduction
The purpose of this experiment is to determine what effect heat
treating and then cooling has on the hardness and grain
structure of two different types of steel. The two different types
of steels were utilized are 1045 steel samples and 4143 steel
sample which is considered to be a low-alloy steel.
The heat-treating process is a method to alter physical and
mechanical properties of the material. The heat-treating process
is consists of three crucial steps of annealing, hardening, and
tempering. Annealing is primarily used to soften and to induce
the ductility of the specimens by heating and holding at suitable
temperature and then cooling, by instantly quenching in the
2. water, which produces the higher brittleness with low ductility
and toughness in the specimens. Moreover, tempering is a
process of heat-treating, which is used to increase the toughness
of metal. Tempering is important because it used to achieve
desired hardness. To restore some the toughness and impact
properties is obtained by tempering where specimens are
reheated to a temperature between 5000 F and 10000 F for
certain time which removes the internal strain caused by sudden
cooling in the quenching bath without a large decrease in
hardness or strength.
In attempting the first phase of the experiment it cannot
determined why some heat-treated materials don’t reach a high
hardness when cooled at certain temperature. With the hardness
test the hardness of a material can be determined. The
Hardenability is a property that determines the depth and
distribution of hardness when steel is heated to a given
temperature and then quenched to reach martensitic structure,
which is obtained by performing Jominy test, where an
austenitized steel bar is quenched at one end only, thus
producing a range of cooling rates along the bar.
Procedure
First of all, the experiment provided six 1045 steel specimens
were for heat treating process, and for the second were only two
steel rods of 1045 steel and 4143 steel respectively used to
perform the Jominy test. In order to go though the details read
the following: First the group begin with identifying all each
specimen by punching different letter on to them using hammer.
Second, the engineer students heated all specimens at 16000 F
for 1/2 hour after obtaining the Rockwell a scale hardness
measurement. Third, The four samples were quenched in water,
one sample is allowed for air cool, and the other sample is set
for furnace cool for one hour and quenched in water. Then, the
two steel rods of different properties also allowed for heated at
16000 F for 45 minutes after obtaining the Rockwell scale
hardness measurements. Also, the group measured the Rockwell
a scale hardness on all six quenched specimens after being heat
3. treated and tempered the three-quenched specimen at different
temperature of 6000 F, 8000 F, and 10000 F respectively for 30
minutes. After tempering specimens then quenched in water.
Moreover, obtained hardness measurements using Brinell (3000
kg) and Rockwell A scale on all six steel specimens. In order to
perform the Jominy test one steel rod is then removed from the
furnace and is placed in the cooling tower for 10 minutes before
quenching in water, repeated the same procedure for other steel
rod. Finally, measured the hardness 1/16 inch for the first inch
and every 1/8 for the next inch and 1/4 for the next 2 inches
using Rockwell a scale for both steel rods.
Results and Discussions
The experiments “Heat Treatment of Steel” and “Hardenability
of Steel” are two different experiments, which show the effects
of heat-treating, and quenching of specimen provides different
hardness and microstructure in the materials. During first phase
of experiment the two specimens are left to cool at room
temperature and furnace temperature, these specimens were
quenched after an hour. The reason for this quenching after an
hour is due to the fact that the grains in the material are given a
chance to form when cooling at room temperature and furnace
cooling temperature. If the grains are not given enough time to
form when cooling at room and oven temperature the grain
structure would not be accurate as if actually air cooled and
furnace cooled. From the Table 1 it can be clearly seen the
hardness obtained through furnace cooled is lesser than
hardness obtained by air cooled specimens because in furnace
cooling allow the grains to from due to its slow cooling process
where as during air cool specimens tends to cool much quicker
compare to furnace cool and specimens have less time to form
grains. Due to that specimens will have more boundaries, which
mean there will be more interference with dislocation motion.
Also, in Table 1 it shows the Rockwell measurement is 76.99
for the instant quench. On the other hand, the furnace cooled is
55.05. Moreover, in Table 2 represent the Ultimate Tensile
strength (psi) for all samples from the average Brinell Hardness
4. number obtained. In fact, the hardness of both of the measured
BNH and the measured Rockwell are decreasing. The Ultimate
Tensile Strength (psi) is also decreasing because the hardness is
going down. As we know the harder a material is the higher the
strength is. Furthermore, the instant quenched sample has the
highest hardness and the Ultimate Tensile strength results.
Finally, Table 3 represents the hardness of the Steel 1045
sample after it has been placed at different tempering
temperatures. Moreover, Table 4 shows the difference in
hardness between Steel 1045 and Steel 4143 that that was taken
at different distance from the quenched end.
Table 1 Comparison between performed Brinell hardness
numbers measurements with Brinell hardness numbers obtained
by conversion of Rockwell A scale measurements.
Specimens
Rockwell
A scale
measurements
RHA Conversion to BHN
Dimple Diameters (mm)
BHN from Dimple Diameters
S instant quench
76.99
500
2.50
601
H Tempered @540 0C
71.58
390
3.20
363
D Tempered @ 430 0C
69.19
353
2.90
5. 444
K Tempered @ 315 0C
70.89
381
2.81
417
M (air cooled)
53.39
172
4.29
197
E (Furnace cooled)
53.05
169
4.51
179
Table 2 Computed Ultimate Tensile strength (psi) based on the
average Brinell Hardness number obtained.
Specimens
Measured BHN
(3000)kg
Measured Rockwell A scale numbers (HRA )
Conversion BHN
Average BHN
Ultimate Tensile Strength (psi)
S
401
75.53
500
550.5
2.75E+05
D
429
71.71
7. and Rockwell a numbers were proportional to each other a
straight line would be seen. A graph like the one shown in
Figure 1 could be a result of an inaccurate machine or
inaccurate measurement taking strategies.
Figure 1 Brinell Hardness numbers vs. Rockwell A scale
numbers obtained after heat treating of the specimens.
Table 3 The hardness measurements obtained using Rockwell A
scale for three 1045 steel specimens that has been tempered at
different temperatures after being heat treated.
Specimens
Hardness Rockwell
A scale (HRA)
Tempering temperature ( c )
D
71.71
430
K
66.89
315
H
66.99
540
Figure 2 Hardness obtained using Rockwell A scale hardness
after tempering the specimens.
To obtain desired mechanical properties in steel specimens it is
necessary to process heat treating, quenching, and tempering of
the steel. Hardening is way of making steel harder, by first heat
treating the specimens to 8850 C for half hour and immediately
cools it by quenching the specimens in water, which increase
the brittleness of the substance at much higher rate with very
low ductility and toughness in the samples. The tempering is the
process through which brittleness is reduced to improve
8. ductility and toughness by heating the specimens at different
temperature for certain time.
Higher tempering temperature will yield a somewhat softer
material with higher toughness, whereas a lower tempering
temperature will produce a harder and somewhat more brittle
material, as shown by the Figure 2 where hardness increases
with the increase of tempering temperature.
The possible errors of not quenching the specimens in desired
time or factors of obtaining the hardness of the samples at
softer spot may have occurred in processing the tempering of
specimens, which resulted on the graphs for not obtaining
consistency.
The decline in hardness of tempered specimens once has been
heat treated and quenched in Table 3 proves the hypothesis of
decrease in brittleness by tempering the specimens.
The Ultimate tensile strength of materials is determined using
equation 1 by using data collected for Brinell hardness for all
the specimens mentioned in Table 2.
Equation 1 Calculating the Ultimate Tensile Strength of
materials.
In determining the strength, obtaining the hardness is great
ways of making comparison, which can be attain using
Rockwell A scale and Brinell hardness scale which is directly
proportional to the tensile strength. In using Brinell hardness
scale timing in maintaining the load on the specimens may have
been a factor of slight variation of results where as in Rockwell
A scale ha
From the Figure 4 the amount of carbide ((Fe3C) can be
calculated at temperature 1338 0F for 1045 steel using equation
2 where C1 is 45% because that is the weight percent of carbon
in 1045 steel. Ca and Cb calculated using the lever rule which
consists of drawing a line across to determine how much weight
percent of material there is in the steel, where “a” is alpha and
“b” is Iron Carbide (Fe3C). Using equation 2 is determined that
Iron carbide percent is about 0.68% and 99.32% is presumed to
be alpha phase.
9. Wb = (C1 – Ca)/(Cb – Ca) , Ca= 2.2%, and Cb= 65% are the
weight percent composition.
Equation 2 To find the Fe3C (carbide) content using weight
percent equation.
Figure 4 The iron-iron carbide phase diagram.
Different microstructures obtained when specimens processed
through differen cooling strategies that is why the TTT (Time,
Temperature, Transformation) chart in Figure 5 is proven to be
great tool in determining the microstructure. The TTT chart
shows the amount of time needed to quench a material to reach
a certain phase. The left part line represents the beginning of
the transformation and the right part line represents the
conclusion of the transformation. The TTT chart also explains
the need of quenching the specimens after an hour of cooling
due to after certain time the specimens does not require any
more transformation. The martensite structure which is one of
the hardest of all phases is obtained upon quenching instantly to
a low temperature. But the other samples that quenched were
temperd again to move higher up in the TTT chart where less
hardened materials are . To obtained a desired phase it is
neccsary to for rapid change in temperature with respect to time
when quenching the 1045 steel to reach a Bainite phase.
The specimens that were furnace cooled and cooled at room
temperature are most likely to fall in the pearlite phase where
the one cooled at room temperature is said to be fine pearlite
while the other one is more close to coarse pearlite due to slow
cooling process. The specimens tempered at 540°C falls
between pearlite and bainite phases. The specimens tempered at
430°C and 315°C fall under the Bainite phase, the one tempered
at a lower temperature could be classified as being of finer
Bainite.
Figure 5 The TTT (Time, Temperature, Transformation) chart
for 1045 steel.
10. Microstructure and hardness are closely correlated;
microstructure consists of grain size and crystal structure. When
the specimens were reached at austenite phase, the grains are
more uniform and homogeneously distributed; upon completion
of this process the specimens are ready to be cooled in order to
obtain different hardeneability in the material. During instant
quenching of the specimens the specimens with evenly
distributed grains are not given a chance to form and are then
solidified giving the material a fine grain structure in contrast
to a material slowly cooling which gives a material more coarse
grains making the material less hard and more ductile. The
Jominy test results illustrated in Figure 3 prove that how
cooling rate affects hardness data obtained on the attempt of
experiment. The greater distance of quenching the less hard the
material is because, as mentioned before, the grains are given
more time to form, and the bigger the grains the less hard the
material. The inconsistency among results obtained instead of
constantly moving downward may have caused due to
experimental errors such as not placing it fast enough on the
Jominy tester. The graph line obtained by the 4143steel and
1045 steel quickly goes up and down not opening the water
enough for quenching during the Jominy test. The overall graph
is also does not matches to the expected results where 1045
steel graph must lower than the graph line obtained by the 4061
steel rod specimen is considered to be an experimental error of
not transporting the specimen on the tester with in time
duration.
Table 4 The Jominy test results obtained on two steel rods.
Distance from quenched end (in)
1045 Steel
4143 Steel
0.0625
75.9
66.2
13. 2.5
47.5
49.7
2.75
46.9
45.5
3
44.2
45.8
3.25
38.6
45.1
3.5
40.1
22.9
3.75
42.7
32
4
36.4
26.3
Figure 3 Plot showing Hardness as a function of distance from
the quenched end for 1045 steel and 4061 steel specimens. The
dash line is the Steel 4061 and the solid line is the Steel 1045.
Conclusion
Materials that cool at slower cooling rates tend to be softer
materials while those that are cooled at faster cooling rates tend
to be harder. Tempering a material lowers its ultimate strength
but increases the amount of stress the material can absorb
(toughness), higher the tempering temperature the lower the
ultimate strength. Tempering also adds more ductile
characteristics to the material. High hardness in materials only
14. can be attain when there is a low toughness, in order to acquire
toughness in a material that has been quenched, The tempering
of the specimens is then processed to improve the toughness in
the material and lower the brittleness.Fine grain structures tend
to be hard material where as materials with coarse grain
structure has more ductile properties. Furthermore, the data
does not accurately show what should be happening. The data I
collected has error that is obviously shows in my graph. The
graph should show a straight line going down similar to the one
in experiment 6. For example, after heating the Steel and
quenched it the group had to measured it and probably by
mistake the engineer student measured the same point twice or
took similar points close to each other. Also, maybe the time it
took to move the Steel from furnace to be quenched was too
long which effected the measurements. Moreover, the water that
was used to quench could have been too strong hitting the
specimen, which leads to make a huge differences in
measurements.
References
D. Callister Jr, Fundamentals of Materials Science and
Engineering, J. Wiley & Sons, NY, 3rd Ed. 2008, Flinn and
Trojan, Engineering Materials and Their Application, Chapter 6
Dieter, Mechanical Metallurgy ASM Handbook on Heat
Treatment, Vol. 2
http://www.smt.sandvik.com/en/products/strip-steel-and-strip-
based-products/strip-products/knife-steel/hardening-
guide/purpose-of-hardening-and-tempering/
http://www.carbidedepot.com/formulas-hardness.htm
William D. Callister, Jr., David G. Rethwisch. Fundamentals of
materials science and engineering, third edition
www.csun.edu/~bavarian/Courses/MSE%20227/Labs/2-
Charpy_test.pdf