The Iron Iron Carbide (Fe Fe 3 C) Phase Diagram
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1 The Iron Iron Carbide (Fe Fe 3 C) Phase Diagram Steels: alloys of Iron (Fe) and Carbon (C). Fe-C phase diagram is complex. Will only consider the steel part of the diagram, up to around 7% Carbon. University of Virginia, Dept. of Materials Science and Engineering 1
2 Phases in Fe Fe 3 C Phase Diagram a-ferrite - solid solution of C in BCC Fe Stable form of iron at room temperature. The maximum solubility of C is wt% Transforms to FCC g-austenite at 912 C g-austenite - solid solution of C in FCC Fe The maximum solubility of C is 2.14 wt %. Transforms to BCC d-ferrite at 1395 C Is not stable below the eutectic temperature (727 C) unless cooled rapidly (Chapter 10) d-ferrite solid solution of C in BCC Fe The same structure as a-ferrite Stable only at high T, above 1394 C Melts at 1538 C Fe 3 C (iron carbide or cementite) This intermetallic compound is metastable, it remains as a compound indefinitely at room T, but decomposes (very slowly, within several years) into a-fe and C (graphite) at C Fe-C liquid solution University of Virginia, Dept. of Materials Science and Engineering 2
3 Comments on Fe Fe 3 C system C is an interstitial impurity in Fe. It forms a solid solution with a, g, d phases of iron Maximum solubility in BCC a-ferrite is wt% at727 C. BCC:relatively small interstitial positions Maximum solubility in FCC austenite is 2.14 wt% at 1147 C - FCC has larger interstitial positions Mechanical properties: Cementite (Fe 3 C is hard and brittle: strengthens steels. Mechanical properties also depend on microstructure: how ferrite and cementite are mixed. Magnetic properties: a -ferrite is magnetic below 768 C, austenite is non-magnetic Classification. Three types of ferrous alloys: Pure Iron: < wt % C in a-ferrite at room T Steels: up to 2.14 wt % C (usually < 1 wt % ) a-ferrite + Fe 3 C at room T (Chapter 12) Cast iron: wt % (usually < 4.5 wt %) University of Virginia, Dept. of Materials Science and Engineering 3
4 Eutectic and eutectoid reactions in Fe Fe 3 C Eutectic: 4.30 wt% C, 1147 C L g + Fe 3 C Eutectoid: 0.76 wt%c, 727 C g(0.76 wt% C) a (0.022 wt% C) + Fe 3 C Eutectic and Eutectoid reactions are important in heat treatment of steels University of Virginia, Dept. of Materials Science and Engineering 4
5 Microstructure in Iron - Carbon alloys Microstructure depends on composition (carbon content) and heat treatment. Assume slow cooling equilibrium maintained Microstructure of eutectoid steel (I) University of Virginia, Dept. of Materials Science and Engineering 5
6 Microstructure of eutectoid steel (II) Pearlite, layered structure of two phases: a-ferrite and cementite (Fe 3 C) Alloy of eutectoid composition (0.76 wt % C) Layers formed for same reason as in eutectic: Atomic diffusion of C atoms between ferrite (0.022 wt%) and cementite (6.7 wt%) Mechanically, properties intermediate to soft, ductile ferrite and hard, brittle cementite. In the micrograph, the dark areas are Fe 3 C layers, the light phase is a-ferrite University of Virginia, Dept. of Materials Science and Engineering 6
7 Microstructure of hypoeutectoid steel (I) Compositions to the left of eutectoid ( wt % C) hypoeutectoid (less than eutectoid -Greek) alloys. g a + g a + Fe 3 C University of Virginia, Dept. of Materials Science and Engineering 7
8 Microstructure of hypoeutectoid steel (II) Hypoeutectoid contains proeutectoid ferrite formed above eutectoid temperature and eutectoid perlite that contains ferrite and cementite. University of Virginia, Dept. of Materials Science and Engineering 8
9 Microstructure of hypereutectoid steel (I) Compositions to right of eutectoid ( wt % C) hypereutectoid (more than eutectoid -Greek) alloys. g g + Fe 3 C a + Fe 3 C University of Virginia, Dept. of Materials Science and Engineering 9
10 Microstructure of hypereutectoid steel (II) Hypereutectoid contains proeutectoid cementite (formed above eutectoid temperature) plus perlite that contains eutectoid ferrite and cementite. University of Virginia, Dept. of Materials Science and Engineering 10
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