1. OBJECT
The hardness test is a mechanical test for material properties which are used in engineering
design, analysis of structures, and materials development. The principal purpose of the
hardness test is to determine the suitability of a material for a given application, or the
particular treatment to which the material has been subjected. The ease with which the
hardness test can be made has made it the most common method of inspection for metals and
alloys.
Replacement of lead Free Cutting Steel - 2018 research paperMukesh Karnik
this project is to study about free cutting steels and machinability property and to focus on newly developed Lead Free- Free Cutting Steel.
Points are given below about project:-
And also explained about Built up edge - Chip Formation to increase the machinability.
effect of alloying elements on free cutting steel.
manufacturing process of free cutting steel.
BASED ON CHROMIUM AND CARBON ADDITION.
To avoid Lead Hazardous problem and environmental friendly.
Cold Work and Annealing: Recovery, Recrystallization and Grain GrowthMANICKAVASAHAM G
Cold Working and Annealing.
Cold working is deformation carried out under conditions where recovery processes are not effective.
Structural changes during cold working of polycrystalline
metals and alloys.
Effect of cold work on properties.
Annealing.
Recovery
Recrystallization is the process in which deformed grains of the crystal structure are replaced by a new set of stress-free grains that nucleate and grow until all the original grains have been consumed. The process is accomplished by heating the material to temperatures above that of crystallization.
6.1 Annealing: Purposes of annealing, Annealing temperature range, Types and applications
6.2 Normalizing: Purposes of Normalizing, Temperature range, Broad applications of Normalizing
6.3 Hardening: Purposes of hardening, Hardening temperature range ,application
6.4 Tempering: Purpose of tempering, Types of tempering and its applications
6.5 Case hardening methods like Carburizing, Nitriding, and Cyaniding.
6.6 Heat treatment Furnaces – Muffle , Box type
1. OBJECT
The hardness test is a mechanical test for material properties which are used in engineering
design, analysis of structures, and materials development. The principal purpose of the
hardness test is to determine the suitability of a material for a given application, or the
particular treatment to which the material has been subjected. The ease with which the
hardness test can be made has made it the most common method of inspection for metals and
alloys.
Replacement of lead Free Cutting Steel - 2018 research paperMukesh Karnik
this project is to study about free cutting steels and machinability property and to focus on newly developed Lead Free- Free Cutting Steel.
Points are given below about project:-
And also explained about Built up edge - Chip Formation to increase the machinability.
effect of alloying elements on free cutting steel.
manufacturing process of free cutting steel.
BASED ON CHROMIUM AND CARBON ADDITION.
To avoid Lead Hazardous problem and environmental friendly.
Cold Work and Annealing: Recovery, Recrystallization and Grain GrowthMANICKAVASAHAM G
Cold Working and Annealing.
Cold working is deformation carried out under conditions where recovery processes are not effective.
Structural changes during cold working of polycrystalline
metals and alloys.
Effect of cold work on properties.
Annealing.
Recovery
Recrystallization is the process in which deformed grains of the crystal structure are replaced by a new set of stress-free grains that nucleate and grow until all the original grains have been consumed. The process is accomplished by heating the material to temperatures above that of crystallization.
6.1 Annealing: Purposes of annealing, Annealing temperature range, Types and applications
6.2 Normalizing: Purposes of Normalizing, Temperature range, Broad applications of Normalizing
6.3 Hardening: Purposes of hardening, Hardening temperature range ,application
6.4 Tempering: Purpose of tempering, Types of tempering and its applications
6.5 Case hardening methods like Carburizing, Nitriding, and Cyaniding.
6.6 Heat treatment Furnaces – Muffle , Box type
Laboratory Experiment. Number 6 & 7Heat Treatment and Hardenabil.docxDIPESH30
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 ...
Study and Analysis on Heat Treatment Process and Microstructure of Low Carbon...IJARTES
Low carbon steel is easily available and cheap
having all material properties that are acceptable for many
applications. Heat treatment on low carbon steel is to improve
ductility, to improve toughness, strength, hardness and tensile
strength and to relive internal stress developed in the material.
Here basically the experiment of harness and ultimate tensile
strength is done to get idea about heat treated low carbon steel,
which has extensive uses in all industrial and scientific fields
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 ...
Mumbai University
Mechanical engineering
SEM III
Material Technology
Module 1.4
Strain Hardening:
Definition importance of strain hardening, Dislocation theory of strain hardening, Effect of strain hardening on engineering behaviour of materials, Recrystallization Annealing: stages of recrystallization annealing and factors affecting it
Study on the Mold Temperature Control for the Core Plate during Injection Mol...IOSR Journals
Abstract: During injection molding process, the mold temperature is one of the most important influences on
the product quality. In this paper, the temperature of the core plate with the size of 100 mm × 100 m × 40 mm
will be examined for different product sizes. Different types of heating and cooling channels are inserted in the
core plate. The size of the plastic product will be changed from 40 mm to 80 mm, with varying heights.
Simulation method will be utilized to observe the heating and cooling steps. The temperature values and
distribution will be collected and compared. Results show that when the product size changes, the heating and
cooling steps have a slight variation. However, the product height has a strong effect on the mold temperature.
When the height increases from 1 mm to 9 mm, the highest heating temperature reduces from 104 °C to 82.5 °C.
The simulation results were verified by an experiment. The comparison between the simulated and the
experimental results shows a good agreement between them. Keywords: Injection Molding, Mold Temperature Control, Mold Heating, Mold Cooling, plastic process
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
For more technical information, visit our website https://intellaparts.com
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
NUMERICAL SIMULATIONS OF HEAT AND MASS TRANSFER IN CONDENSING HEAT EXCHANGERS...ssuser7dcef0
Power plants release a large amount of water vapor into the
atmosphere through the stack. The flue gas can be a potential
source for obtaining much needed cooling water for a power
plant. If a power plant could recover and reuse a portion of this
moisture, it could reduce its total cooling water intake
requirement. One of the most practical way to recover water
from flue gas is to use a condensing heat exchanger. The power
plant could also recover latent heat due to condensation as well
as sensible heat due to lowering the flue gas exit temperature.
Additionally, harmful acids released from the stack can be
reduced in a condensing heat exchanger by acid condensation. reduced in a condensing heat exchanger by acid condensation.
Condensation of vapors in flue gas is a complicated
phenomenon since heat and mass transfer of water vapor and
various acids simultaneously occur in the presence of noncondensable
gases such as nitrogen and oxygen. Design of a
condenser depends on the knowledge and understanding of the
heat and mass transfer processes. A computer program for
numerical simulations of water (H2O) and sulfuric acid (H2SO4)
condensation in a flue gas condensing heat exchanger was
developed using MATLAB. Governing equations based on
mass and energy balances for the system were derived to
predict variables such as flue gas exit temperature, cooling
water outlet temperature, mole fraction and condensation rates
of water and sulfuric acid vapors. The equations were solved
using an iterative solution technique with calculations of heat
and mass transfer coefficients and physical properties.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
We have compiled the most important slides from each speaker's presentation. This year’s compilation, available for free, captures the key insights and contributions shared during the DfMAy 2024 conference.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Student information management system project report ii.pdf
Cold working and annealing lab
1. Cold Working and Annealing Lab
CHE 333 Engineering Materials
7 November 2013
2. Introduction
Cold working is a process performed at room temperature. This includes a
variety of processes, such as forging, rolling, drawing, and extrusion. Although these
processes can be done at elevated temperatures, they must be done at room
temperature in order to be considered a cold working process. There are a few
reasons for utilizing cold working. One of these reasons is to homogenize the
material by moving the atoms within the structure. Secondly, this process aids in
controlling grain size. The grain size is maintained through full annealing when the
cold working process is completed. In addition to this, the material is hardened
through this process because the yield strength is increased, and thus lowering the
ductility.
In order to restore ductility, a process called annealing is performed. Since
cold working increases the yield stress and lowers the ductility, cold working can
only go so far before the material cannot handle the process anymore. Although
some ductility is restored to the material, some of the yield stress gained from cold
working will be lost. Annealing is a three-step process that recovers the material to
move and remove dislocations, recrystallizes to restore its mechanical properties,
and stimulate grain growth. Together, cold working and annealing provide the
desired mechanical properties of a material.
Equipment
One annealed 70-30 brass sample, 0.108in thick x 4in long by1.25in wide
Three furnaces at temperatures at 350 C (to +L solidus at 920C for 70-30 brass)
One measuring caliper
Instron hardness tester on R30T scale and 1/16” steel ball indenter
Five pre-rolled samples of various thicknesses
Five samples consisting of 10, 20, 30, 40, and 50% cold worked 70-30 brass
Tongs
Beakers with water to cool samples
3. Experimental Procedure
The first part of the procedure is cold working. Each group was provided one
sample of brass (6 total) initially 0.0108 inches thick. The samples were rolled to
several different thicknesses, and these final thicknesses were measured to calculate
the percent cold work for each sample. Each individual sample had a different
percent cold work. Once cold working was completed, the hardness was tested
twice for each sample. Hardness was tested on the Intron hardness tester set to the
Rockwell 30T scale with a 1/16th inch ball indenter as it was done in the previous
hardness testing lab. The hardness was tested twice for each sample and the
average hardness was recorded.
Once that process was completed, each group utilized the process of
annealing their samples. Each of these samples had a different hardness and percent
cold work. The hardness was tested twice for each of the samples after being
individually placed into a 400oC furnace at 5 minutes, 10 minutes, 15 minutes, 30
minutes, and 45 minutes. The hardness was tested using the same machine as it was
previously done after cold working. The data was recorded to illustrate the time and
cold work dependencies of recrystallization.
Experimental Data
Sample # Thickness (in) % Cold Work (%) Hardness
1 0.108 0 42.2
2 0.101 6.5 53.1
3 0.094 13 62.7
4 0.087 19.4 67.2
5 0.082 24.1 69.6
6 0.075 30.6 72.2
Table 1: Percent cold-worked and hardness for each sample
5. Table 2: Average hardness of each sample
Graph 2: Hardness vs. Time at 400°C
0 5 10 15 20 25 30 35 40 45
30
35
40
45
50
55
60
65
70
75
80
Time (minutes)
Hardness(R30T)
Hardness V Time for 70-30 Brass at 400 C
Thickness= 0.108"
Thickness= 0.101"
Thickness= 0.094"
Thickness= 0.087"
Thickness= 0.082"
Thickness= 0.075"
6. Discussion
Each sample being tested during cold working initially had the same
thickness. The final thickness of each sample differed when they were rolled at
room temperature. Knowing this, we can use the following equation to calculate the
percent cold work of each sample:
% Cold Work =
Since all of the final thicknesses were different, each sample will have a different
percent cold work. Because of this, the hardness of each sample differed as well,
meaning that the percent cold work of the sample correlates to hardness and yield
strength. Cold working increases these properties while lowering ductility.
Through annealing, each sample was placed in the same conditions, which
was the 400°C furnace 5 min, 10 min, 15 min, 30 min, and 45 min and having their
hardness tested in between each amount of time. Regardless of these conditions,
each sample reacted differently, which is easy to tell from the different curves in the
graph. The reason for this is that each sample had a different percent cold work. The
percent cold work affects recrystallization, hardness, and grain size of the materials.
Because of this, we conclude that the material has a specific percent cold work that
it must reach prior to recrystallization.
Conclusion
Cold working and annealing work together in order to strengthen the
mechanical properties of a material. Cold working is performed first, which could be
a variety of processes such as rolling, forging, extruding, and drawing as long as it is
done at room temperature. The purpose of cold working is to increase the yield
stress and hardness of a material. During cold working, the stress and strain of the
material are increase, which causes plastic deformation, and work hardening occurs.
Once cold working is completed, the material will have high yield stress and
dislocation density while also having low ductility.
Some of this ductility that has been lost is recovered through annealing. This
process has three steps: recovery, recrystallization, and grain growth. During
recovery, dislocations in the material are moved and removed through thermal
processes. This is the first stage and there is not a major change in ductility and
yield stress yet. Dislocations are removed through the diffusion of atoms. Cells are
created and form the nuclei of the new grains. During recrystallization, a majority of
the material’s mechanical properties are restored. It is necessary for the right
amount of cold working to be done prior to this step in order for new grains to form.
Small grain size is desired during grain growth, which can only be achieved if the
critical percent cold work is reached. If it is not close enough to that point, there will
be larger grain size.
7. References
CHE 333 Sixth Lab: Cold Working of 7030 Brass PDF
CHE 333 Seventh Lab: Annealing of 7030 Brass PDF
CHE 333 Class 15 PowerPoint
CHE 333 Class 16 PowerPoint