Mod01 lec28 metal working deformation processing contd. Autoplay when autoplay is enabled, a suggested video will automatically play next. Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects. The fefe3c diagram is not the easiest thing to understand. Bcc orthorhombic ironcarbon phase diagram iron shows a eutectic with carbon allowing for a lower melting alloy body centered tetragonal. Having trouble understanding the ironcarbon phase diagram.
The ironcarbon diagram provides a valuable foundation on which to build knowledge of both plain carbon and alloy steels in their immense variety. The iron carbon diagram there are two iron carbon equilibrium diagrams. Iron carbon diagram free download as powerpoint presentation. Bakhuis roozeboom gave in i9oo j a n interpreta t i f known facts relative to the constitution of metals fo cd of iron and carbon, which is unexceptionable from a th rctical point of view, but upon which some points re. Unit cell unit cell is the basic building block of crystal structure and defines the crystal structure by virtue of its geometry and the atom positions within.
A phase is a portion of a substance possessing a welldefined structure, uniform composition, and distinct boundaries or interfaces. The ironcarbon equilibrium diagram and plain carbon steels. The iron carbon diagram provides a valuable foundation on which to build knowledge of both plain carbon and alloy steels in their immense variety. The much larger phase field of gammairon austenite compared with that of alphairon ferrite indicates clearly the. This chapter discusses ironcarbon equilibrium diagram.
Teach yourself phase diagrams university of cambridge. Now in order for us to do that, lets go back and take a look at the ironcarbon phase diagram. Iron carbon phase diagram in their simplest form, steels are alloys of iron fe and carbon c. Sketch and explain the iron carbon equilibrium diagram. Nptel video lectures, iit video lectures online, nptel youtube lectures, free video lectures, nptel online courses, youtube iit videos nptel courses. It also covers the invariant reactions of iron carbon system. Classification, properties and uses of carbon steels, cast iron and alloy wheels. And as you cool down pure iron and some amount of carbon in the material what you get is a phase that is called delta iron. Martensite non equilibrium bct phase from quench of. Iron carbon equilibrium diagram as used in engineering materials by mechanical engineers. When we look at the phase diagram over a range of different temperatures, what we see is iron melts at a temperature of 1538 c. So, apart from fefe3c diagram, your concepts in heat treatment may be weak. Introduction to iron carbon diagram, different phases of iron and reactions at elevated temperatures.
The study of the constitution and structure of iron and steel start with the ironcarbon phase diagram. Please provide detailed solutions, steps and explanations. An equilibrium phase or constitutional diagram is a graphic representation of the effects of temperature and. By using the iron carbon fec phase diagram provided herein, answer the following questions, e sec relevant portions of the diagram in answering the questions if you believe it is convenient. Binary systems have two components, ternary systems three, and so on. Equilibrium phase change temperature 100 200 300 400 500 600 700 t e m p e r a t u r e b c 0. Principles of physical metallurgy nptel online videos. The fec phase diagram is a fairly complex one, but we will only consider the steel part of the diagram, up to around 7% carbon.
The ironcarbon equilibrium diagram introduction the ironcarbon diagram is the basis of two very important groups of alloys. At the lowcarbon end of the metastable fec phase diagram, we distinguish ferrite alphairon, which can at most dissolve 0. In a glass of soda with ice, the soda is continuous and the ice is discontinuous. Equilibrium phase change temperature 100 200 300 400 500 600 700 t e m p e r a t u r e b c. Ironcarbon equilibrium diagram mechanical engineering. You may mar your answers on the provided phase diagram as well. The iron carbon equilibrium diagram introduction the iron carbon diagram is the basis of two very important groups of alloys. L liquid phase a ferrite bcc structure ferromagnetic fairly ductile d bcc structure. This is a fairly complex phase diagram but we are only interested in the steels part of. Co lead to the diffusion of c into the iron at the surface case hardened steel even a fraction of a percent of carbon can have a dramatic effect on hardness hittites needed to beat bronze in terms of hardness so their weapons could pierce bronze shields quenching also hardened steel martensite followed by tempering heating. It is the softest structure that appears on the diagram.
A new version of the complete equilibrium phase diagram of the iron carbon system has been proposed, which enables to reject the conventional superposed version of the equilibrium and non. Discuss the iron carbon diagram and various allotropies of. The compositions of the two new phases are given by the ends of the tieline through the eutectoid point. This is a fairly complex phase diagram but we are only interested in the steels part of the diagram up to around 7% carbon. Our new crystalgraphics chart and diagram slides for powerpoint is a collection of over impressively designed datadriven chart and editable diagram s guaranteed to impress any audience. Fe3c iron carbide called cementite because it is hard. Equilibrium of ironcarbon systems by g, qharpand l. Return to the main teach yourself phase diagrams website.
A simplified version of the iron carbon equilibrium diagram is shown below. It should first be pointed out that the normal equilibrium diagram really represents the metastable equilibrium between iron and iron carbide cementite. Teach yourself phase diagrams and phase transformations. Therefore, it is also called as ironiron carbide equilibrium diagram. Jan 05, 2014 principles of physical metallurgy by prof. The ironiron carbide fefe3c phase diagram microstructures of iron. Diagrammy sostoyaniya dvoinykh i mnogokomponentnykh sistem na osnove zheleza. Mechanical engineering best website for mechanical engineers with complete. Equilibrium of iron carbon systems by g, qharpand l.
Home page of the doitpoms micrograph library, based in the department of materials science and metallurgy in the university of cambridge. Nptel provides elearning through online web and video courses various streams. Ghosh,department of metallurgy and material science, iit kharagpur. Thus, this diagram is only just a part of the complete fec equilibrium diagram. Now in order for us to do that, lets go back and take a look at the iron carbon phase diagram. Up next iron carbon equilibrium diagram complete discussion with interview questions duration. Unit quiz the ironcarbon system multiple choice identify the choice that best completes the statement or answers the question. Interstitial sites of fcc interstitial sites of bcc. Were now going to focus in this lesson, on the iron carbon system.
Oct 11, 2017 iron carbon equilibrium diagram, ttt diagram and heat treatment 1. Iron carbon diagram iron iron carbide phase diagram iron iron carbide phase diagram features of ironiron carbide diagram phases present. According to the diagram, point b is which of the following. Chapter 4 equilibrium phase diagrams and the ironcarbon. Download meta ris compatible with endnote, reference manager, procite, refworks bib tex compatible with bibdesk, latex text. This chapter discusses iron carbon equilibrium diagram. The ironiron carbide fefe3c phase diagram in their simplest form, steels are alloys of iron fe and carbon c. Iron carbon diagram leaving certificate engineering notes. A phase diagram or equilibrium diagram is a diagram with t and composition as axes, showing the equilibrium constitution. It provides an invaluable foundation on which to build knowledge of both carbon steels and alloy steels, as well as a number of various heat treatments they are usually subjected to hardening, annealing. The part of iron carbon alloy system diagram between pure iron and an interstitial compound, iron carbide fe 3 c, containing 6. Principles of physical metallurgy free video lectures. Iron carbon equillibrium diagram with explanation youtube.
By using the ironcarbon fec phase diagram provided herein, answer the following questions, e sec relevant portions of the diagram in answering the questions if you believe it is convenient. The ironcarbon diagram there are two ironcarbon equilibrium diagrams. The study of the constitution and structure of iron and steel start with the iron carbon phase diagram. Nptel video lectures, iit video lectures online, nptel youtube lectures. Phase diagrams metastable ironcarbon fec phase diagram. Learn for free, pay a small fee for exam and get a certificate. The main structures, significance of various lines and critical points are discussed as. Due to the high lattice distortion, martensite has high residual stresses.
Ghosh,department of metallurgy and material science,iit kharagpur. It is an interstitial solid solution of a small amount of carbon dissolved in. What is an intuitive explanation of the ironcarbon phase. The phase diagram of an alloy made of components a and b, for all combinations of t and x b, defines the ab system. Show all you workings and give clear but short explanations in your bluebook whenever. Introduction to ironcarbon equilibrium diagram structures in fec diagram iron carbon equilibrium diagram fig. Equilibrium phase diagram of the ironcarbon system. The ironcarbon equilibrium diagram over a very small range of carbon 0 to 2% by weight, or 0 to 7% by atoms this is as much carbon as steel can handle before it turns into cast iron, and then useless rock. A compound of iron and carbon that is very hard and brittle. Iron carbon phase diagram crystal structure the atoms of liquid metal during solidification arrange themselves into a systematic pattern called a crystal structure. Conventionally, the complete fec diagram should extend from 100% fe to 100% carbon, but it is normally studied up to around 6. Dmitri kopeliovich ironcarbon phase diagram describes the ironcarbon system of alloys containing up to 6. Eutectoid transformation in ironcarbon phase diagram duration. A study of the microstructure of all steels usually starts with the metastable ironcarbon fec binary phase diagram figure 1.
The three phases, ferrite, cementite and pearlite are the principal constituents of the microstructure of plain carbon steels if they have. Ironcarbon equilibrium diagram as used in engineering materials by mechanical engineers. Nptel, online courses and certification, learn for free. The part of ironcarbon alloy system diagram between pure iron and an interstitial compound, iron carbide fe 3 c, containing 6. A new version of the complete equilibrium phase diagram of the ironcarbon system has been proposed, which enables to reject the conventional superposed version of the equilibrium and non. The ironcarbon equilibrium diagram total materia article.
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