Chapter 9_Part_9

Chapter 9_Part_9 - The IronIron Carbide (FeFe3C) Phase...

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41 MSE 2090: Introduction to Materials Science Chapter 9, Phase Diagrams The Iron–Iron Carbide (Fe–Fe 3 C) Phase Diagram 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 diagram, up to around 7% Carbon.
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42 MSE 2090: Introduction to Materials Science Chapter 9, Phase Diagrams Phases in Fe–Fe 3 C Phase Diagram ¾ α -ferrite - solid solution of C in BCC Fe • Stable form of iron at room temperature. • The maximum solubility of C is 0.022 wt% • Transforms to FCC γ -austenite at 912 ° C ¾ γ -austenite - solid solution of C in FCC Fe • The maximum solubility of C is 2.14 wt %. • Transforms to BCC δ -ferrite at 1395 ° C • Is not stable below the eutectoid temperature (727 ° C) unless cooled rapidly (Chapter 10) ¾ δ -ferrite solid solution of C in BCC Fe • The same structure as α -ferrite • Stable only at high T, above 1394 ° C • Melts at 1538 ° C ¾
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This note was uploaded on 02/14/2012 for the course MSE 2090 taught by Professor Leoindzhiglei during the Fall '10 term at UVA.

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Chapter 9_Part_9 - The IronIron Carbide (FeFe3C) Phase...

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