1) The document discusses various micro-constituents that make up iron-carbon alloys including ferrite, pearlite, austenite, cementite, and martensite.
2) It provides definitions and properties of each micro-constituent, for example ferrite is a solid solution of carbon in body centered cubic iron that is the softest structure.
3) The document also discusses the transformation structures in steel and cast iron of different carbon contents during heating and cooling processes.
Mumbai University.
Mechanical Engineering
SEM III
Material Technology
MOdule 2.2
Theory of Alloys& Alloys Diagrams :
Significance of alloying, Definition, Classification and properties of different types of alloys, Solidification of pure metal, Different types of phase diagrams (Isomorphous, Eutectic,
08
University of Mumbai, B. E. (Mechanical Engineering), Rev 2016 19
Peritectic, Eutectoid, Peritectoid) and their analysis, Importance of Iron as engineering material, Allotropic forms of Iron, Influence of carbon in Iron- Carbon alloying Iron-Iron carbide diagram and its analysis
Topic related to material science and metallurgy, Includes basic information about steel.Also the Iron-Iron Carbon Diagrams and its structures with various features of fe-c diagram.
Mumbai University.
Mechanical Engineering
SEM III
Material Technology
MOdule 2.2
Theory of Alloys& Alloys Diagrams :
Significance of alloying, Definition, Classification and properties of different types of alloys, Solidification of pure metal, Different types of phase diagrams (Isomorphous, Eutectic,
08
University of Mumbai, B. E. (Mechanical Engineering), Rev 2016 19
Peritectic, Eutectoid, Peritectoid) and their analysis, Importance of Iron as engineering material, Allotropic forms of Iron, Influence of carbon in Iron- Carbon alloying Iron-Iron carbide diagram and its analysis
Topic related to material science and metallurgy, Includes basic information about steel.Also the Iron-Iron Carbon Diagrams and its structures with various features of fe-c diagram.
Part a). Pearlite - Pearlite is a two-phased, lamellar (or l.pdfannaelctronics
>> Part a).
>> Pearlite :- Pearlite is a two-phased, lamellar (or layered) structure composed of alternating
layers of ferrite (88 wt%) and cementite (12 wt%) that occurs in some steels and cast irons. In
fact, the lamellar appearance is misleading since the individual lamellae within a colony are
connected in three dimensions; a single colony is therefore an interpenetrating bicrystal of ferrite
and cementite. In an iron-carbon alloy, during slow cooling pearlite forms by a eutectoid reaction
as austenite cools below 727 °C (1,341 °F) (the eutectoid temperature). Pearlite is a
microstructure occurring in many common grades of steels.
>> Cementite :- Cementite, also known as iron carbide, is an interstitial compound of iron and
carbon, more precisely an intermediate transition metal carbide with the formula Fe3C. By
weight, it is 6.67% carbon and 93.3% iron. It has an orthorhombic crystal structure. It is a hard,
brittle material, normally classified as a ceramic in its pure form, though it is more important in
ferrous metallurgy. While iron carbide is present in most steels and cast irons, it is produced as a
raw material in the Iron Carbide process, which belongs to the family of alternative ironmaking
technologies.
>> Austenite :- Austenite, also known as gamma-phase iron (-Fe), is a metallic, non-magnetic
allotrope of iron or a solid solution of iron, with analloying element. In plain-carbon steel,
austenite exists above the critical eutectoid temperature of 1,000 K (1,340 °F; 730 °C); other
alloys of steel have different eutectoid temperatures. It is Face Centred Cubic Configuration
(FCC).
>> Eutectoid Phase :- When the solution above the transformation point is solid, rather than
liquid, an analogous eutectoid transformation can occur. For instance, in the iron-carbon system,
the austenite phase can undergo a eutectoidtransformation to produce ferrite and cementite, often
in lamellar structures such as pearlite and bainite.
>> Proeutectoid :- When a hot steel with carbon content very close to 0.8%, is cooled down
slowly, there is a temperature (723 deg C) at which a constant-temperature transformation takes
place. This is called eutectoid transformation. And this results in formation of alternate layers of
Ferrite and Iron-Carbide (Fe3C).
But if the carbon content in this hot steel is much less than 0.8%, and it is cooled down slowly,
then till the temperature reduces to 723 deg C, a part of Austenite (also called gamma iron) gets
transformed to Ferrite by rejecting carbon from the solution. This is not a constant-temperature
process and occurs over a range of temperature. The ferrite so formed is called Proeutectoid...At
723 deg C, all the remaining Austenite get converted to Pearlite at this constant temperature -
which is nothing but alternate layers of Ferrite and cementite
>> Martensite :- Martensite, most commonly refers to a very hard form of steel crystalline
structure, but it can also refer to any crystal structure that is form.
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.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
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.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
6. Definition of structures
• Ferrite is known as α solid solution.
• It is an interstitial solid solution of a small amount
of carbon dissolved in α (BCC) iron.
• stable form of iron below 912 deg.C
• The maximum solubility is 0.025 % C at 723C and
it dissolves only 0.008 % C at room temperature.
• It is the softest structure that appears on the
diagram.
7. Definition of structures
Ferrite
• Average properties are:
– Tensile strength = 40,000 psi;
– Elongation = 40 % in 2 in;
– Hardness > Rockwell B 90
8. Definition of structures
• Pearlite is the eutectoid mixture
containing 0.80 % C and is formed
at 723°C on very slow cooling.
• It is a very fine plate like or
lamellar mixture of ferrite and
cementite.
• The white ferritic background or
matrix contains thin plates of
cementite (dark).
9. Definition of structures
Pearlite
• Average properties are:
– Tensile strength = 120,000 psi;
– Elongation = 20 % in 2 in.;
– Hardness = Rockwell C 20
10. Definition of structures
• Austenite is an interstitial solid solution of
Carbon dissolved in (F.C.C.) iron.
• Maximum solubility is 2.0 % C at 1130°C.
• High formability, most of heat treatments begin
with this single phase.
• It is normally not stable at room temperature.
But, under certain conditions it is possible to
obtain austenite at room temperature.
11. Definition of structures
Austenite
• Average properties are:
– Tensile strength = 150,000 psi;
– Elongation = 10 percent in 2 in.;
– Hardness = Rockwell C 40,
approx; and
– toughness = high
12. Definition of structures
• Cementite or iron carbide, is very hard, brittle
intermetallic compound of iron & carbon, as
Fe3C, contains 6.67 % C.
• It is the hardest structure that appears on the
diagram, exact melting point unknown.
• Its crystal structure is orthorhombic.
• It is has
– low tensile strength (approx. 5,000 psi), but
– high compressive strength.
13. Definition of structures
• Ledeburite is the eutectic
mixture of austenite and
cementite.
• It contains 4.3 percent C and is
formed at 1130°C.
14. Definition of structures
Martensite - a super-saturated solid solution of carbon
in ferrite.
It is formed when steel is cooled so rapidly that the
change from austenite to pearlite is suppressed.
The interstitial carbon atoms distort the BCC ferrite into
a BC-tetragonal structure (BCT).; responsible for the
hardness of quenched steel
18. TRANSFORMATION STRUCTURE IN Steel (EUTECToid, HYPO
EUTECToid AND HYPER EUTECToid steel)
1. TRANSFORMATION OF Eutectoid Steel
2. TRANSFORMATION OF HYPO Eutectoid Steel
3. TRANSFORMATION OF HYPER Eutectoid Steel
19.
20.
21.
22.
23.
24.
25. TRANSFORMATION STRUCTURE IN CAST IRON (EUTECTIC,
HYPOEUTECTIC AND HYPER EUTECTIC CAST IRONS)
• 1) TRANSFORMATION OF EUTECTIC CAST
IRON:
– CAST iron contains 4.3% C
– Heated to 1175 C
– Cooled slowly to 1148 C
– Mixture of austenite + cementite forms
26. • 2) TRANSFORMATION OF HYPO EUTECTIC
CAST IRON:
– It is having LESS THAN 4.3% C
– A 3.4% C cast iron heated up to 1350 C
– Cooled slowly to 1250 C (liquid metal and
austenite crystals forms)
– At 1148 C 50% austenite and 50% cementite
– Cooling slowly below 723 C
– Final structure as cementite , pearlite and
transformed ledeburite
27. • 3) TRANSFORMATION OF HYPER EUTECTIC CAST
IRON
– CAST IRON HAVING MORE THAN 4.3% C
– a sample of 4.8% C
– Heated to 1450 C for sufficient time
– It very cooled slowly formation of liquid phase
– Further slow cooling at 1148 C formation of
ledeburite takes place.
– Cooling below 723 C formation of pearlite takes place
28.
29. FERRITE AND AUSTENITE STABILIZERS
• Three most common phases in Iron-Carbon
Phase diagram are Ferrite,Cementite and
Austenite. Stabilising a particular phase
primarily means making that phase more
available in room temperature. This effect may
lead to excessive changes in properties and
may make the material fit or unfit for certain
application.
30. • Ferrite generally has body centered cubic type
of structure. According to Hume Rothery
Principle a body centered cubic (BCC) material
will stabilise another body centered cubic type
of material when mixed with each other.
Therefore, Ti, Cr, Mo, Al will help in stabilising
ferrite at room temperature.
31. • Austenite generally has face centered cubic
type of structure. According to Hume Rothery
Principle a face centered cubic (FCC) material
will stabilise another face centered cubic type
of material when mixed with each other.
Therefore, Si, Mn, Ni, C will help in stabilising
austenite at room temperature.