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What microconstituent of iron-carbon alloys does this diagram illustrate?

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What microconstituent of iron-carbon alloys does this diagram illustrate?

(a) Pearlite

(b) Austenite

(c) Cementite

(d) Sorbite

This question was addressed to me in semester exam.

My enquiry is from Iron-Carbon System and their Alloys in chapter Constitution of Alloys and Phase Diagrams of Engineering Material & Metallurgy

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Right choice is (d) Sorbite

To explain I would say: Sorbite is the microstructure containing ferrite and cementite. This is produced by tempering martensite above 450oC. Sorbite steels are also known as toughened steels owing to their tensile and yield strengths being high.

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