[PDF] [PDF] IRON –CARBON PHASE DIAGRAM

[PDF] IRON –CARBON PHASE DIAGRAM

Definition of structures: Various phases that appear on the Iron- Carbon equilibrium phase diagram are as under: • Austenite • Ferrite • Pearlite • Cementite

The C-Fe (carbon-iron) system

Weighk Percent Carbon 1 Assessed Fe-C phase diagram from 0 to 25 aL Fe Stable Fe-C (graphite) and metastable Fe-Fe3C (cementite) equilibria

[PDF] The Iron - Iron Carbide (Fe-Fe C) Phase Diagram - Academic Uprm

Phases in Fe–Fe 3 C Phase Diagram ➢ α-ferrite - solid solution of C in BCC Fe • Stable form of iron at room temperature • Transforms to FCC g-austenite at 

[PDF] Iron/Carbon Phase Diagram

Martensite (non equilibrium BCT phase from quench of γ) BCC Orthorhombic Iron/Carbon Phase Diagram Iron shows a eutectic with Carbon allowing for a 

[PDF] Iron–Iron Carbide (Fe–Fe3C) Phase Diagram - NIFFT

The Fe-C phase diagram is a fairly complex one, but we will only consider the steel part of the diagram, up to around 7 carbon Page 2 Phases in Fe–Fe3C 

[PDF] Iron Carbon Phase diagram Questions - NPTEL

Lecture 23-24 : Iron Carbon Phase diagram Questions: 1 FCC is a more close packed structure yet solubility of carbon in austenite which is FCC is higher

[PDF] Phase Diagrams - NPTEL

3) The iron-carbon system, phase transformations 4) Transformation rate effects and TTT diagrams, Microstructure and property changes in iron- carbon system

[PDF] Iron-Carbon Phase Diagram (a review) see Callister Chapter 9

In their simplest form, steels are alloys of Iron (Fe) and Carbon (C) The Fe-C phase diagram is a fairly complex one, but we will only consider the steel part of the 

[PDF] Iron-Carbon Phase Diagram Its defined as:- A map of the

In their simplest form, steels are alloys of Iron (Fe) and Carbon (C) Notes: - This graph, which is known as iron- carbon equilibrium diagram has the following

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CB.EN.P2MFG15018

IRON

CARBON PHASE DIAGRAM

Definition of structures:

yVariousphasesthatappearontheIron-

Carbonequilibriumphasediagramareas

under:

Austenite

Ferrite

Pearlite

Cementite

Martensite

Ledeburite

Definition of structures:

Carbondissolvedin(F.C.C.)iron.

yMaximumsolubilityis2.0%Cat1130°C. withthissinglephase. yItisnormallynotstableatroomtemperature.

But,undercertainconditionsitispossibleto

obtainausteniteatroomtemperature.

Austenite

yAverage properties are: yTensile strength = 150,000 psi; yElongation= 10 percent in 2 in.; yHardness= Rockwell C 40, approx; and ytoughness= high

Definition of structures:

yFerriteisknownasȽsolidsolution. yItisaninterstitialsolidsolutionofasmall amountofcarbondissolvedinȽ(BCC)iron. ystableformofironbelow912deg.C. yThemaximumsolubilityis0.025%Cat723C anditdissolvesonly0.008%Catroom temperature. yItisthesofteststructurethatappearsonthe diagram.

Ferrite

Averagepropertiesare:

yTensilestrength=40,000psi; yElongation=40%in2in; yHardness>Rockwell C0or>

RockwellB90

Definition of structures:

yPearliteistheeutectoidmixturecontaining

0.80%Candisformedat723°Converyslow

cooling. ferriteandcementite. yThewhiteferriticbackgroundormatrix containsthinplatesofcementite(dark).

Pearlite

Averagepropertiesare:

Tensile

strength=120,000 psi;

Elongation=20%in2

in.;

Hardness=Rockwell

C20,BHN-300

Definition of structures:

intermetalliccompoundofiron&carbon,as

Fe3C,contains6.67%C.

yItisthehardeststructurethatappearsonthe diagram,exactmeltingpointunknown. yItscrystalstructureisorthorhombic. yItishas ylowtensilestrength(approx.5,000psi),but yhighcompressivestrength.

Definition of structures:

carboninferrite. thechangefromaustenitetopearliteis suppressed. yTheinterstitialcarbonatomsdistorttheBCC responsibleforthehardnessofquenchedsteel

Definition of structures:

yLedeburiteistheeutecticmixtureof austeniteandcementite. yItcontains4.3percentCandisformedat

1130°C.

The Iron-Carbon Diagram:

yAmapofthetemperatureatwhichdifferent phasechangesoccuronveryslowheating andcoolinginrelationtoCarbon,iscalled Iron

Carbon

Diagram.

yIron-Carbondiagramshows- ythetypeofalloysformedunderveryslow cooling, yproperheat-treatmenttemperatureand yhowthepropertiesofsteelsandcastirons canberadicallychangedbyheat-treatment.

Cooling curve for pure iron

Various Features of Fe-C diagram

Max. solubility of C in ferrite=0.022%

Max. solubility of C in %austenite=2%

IRON »CARBON DIAGRAM

Three Phase Reactions

yPeritectic, at 1490 deg.C, with low wt% C alloys (almost no engineering importance). yEutectic, at 1130 deg.C, with 4.3wt% C, alloys called cast irons. yEutectoid, at 723 deg.Cwith eutectoid composition of 0.8wt% C, two-phase mixture (ferrite & cementite). They are

Eutectic,Eutectoid,&Peritectic:

Peritectic

liquid and one solid phase transform to a 2nd solid phase Solid + Liquid Solid + L yEutectic-liquid transforms to two solid phases L + ÅEutectoid»one solid phase transforms to two other solid phases

Solid1 ļSolid2 + Solid3

+ Fe

Simplified Iron-Carbon phase

diagram yļpearlite(mixture of ferrite & cementite)

Eutectoid reaction

Redistribution of carbon by

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