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ch11.2-S06 - Summary of Microconstituents in steels The...

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MY2100 – Ch 11, Part 2, Slide 1 Summary of Microconstituents in steels The following form on slow cooling of γ in compositions different than the eutectoid: Primary α Primary Fe 3 C ( α + Fe 3 C) microconstituents (all form below the eutectoid temp.): Pearlite (slow cooling) Bainite (quicker cooling) Tempered martensite (formed by re-heating martensite) Martensite (formed by quenching γ very quickly)
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MY2100 – Ch 11, Part 2, Slide 2 Microconstituents in steels Primary α Pearlite Bainite Tempered martensite martensite ( but brittle ) Primary Fe 3 C ( but brittle ) Decreasing Fe 3 C size Increasing strength
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MY2100 – Ch 11, Part 2, Slide 3 How do we keep all this straight? For every commercial steel, there are two diagrams available that give you the processing window for making different microconstituents. Isothermal transformation (IT) diagrams (curves) Continuous cooling transformation (CCT) diagrams (curves) In this class, we will only look at IT diagrams for eutectoid steels, just to see the utility of the curves.
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