ch10.3-S06 - Chapter 10: Steel - The Iron/Carbon System...

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MY2100 – Ch 10, Part 3, Slide 1 Chapter 10: Steel - The Iron/Carbon System structure processing properties Performance ISSUES TO ADDRESS. .. What does the phase diagram look like for Fe-C (basic composition of steel)? What microstructures exist in steels?
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MY2100 – Ch 10, Part 3, Slide 2 Steel - The Iron/Carbon System A huge fraction of structural materials used for transportation, construction, tooling and machinery are made of steel. The basic building blocks of steels are iron and carbon. Other alloying elements are used to control corrosion resistance or to improve response to heat treatment. So we need to study the iron-carbon system to understand steels.
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MY2100 – Ch 10, Part 3, Slide 3 Fe 3 C Structural steels contain less than 1.5 wt% C. So we really only need to study the very left-hand side of the Fe-C phase diagram. In this region, there is an intermediate compound of tremendous importance: Fe 3 C. We call this cementite , or iron carbide , or sometimes just carbide . Medium and high strength steels are two-phase mixtures of α -iron and cementite.
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MY2100 – Ch 10, Part 3, Slide 4 Fe-Fe 3 C Phase Diagram Result: Pearlite = alternating layers of αανδΦε 3 Χπηασεσ. 120 μμ
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ch10.3-S06 - Chapter 10: Steel - The Iron/Carbon System...

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