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A mixture of austenite and cementite is called ___________

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A mixture of austenite and cementite is called ___________

(a) Ferrite

(b) Ledeburite

(c) Pearlite

(d) Bainite

I had been asked this question in examination.

This key question is from Transformation of Steel and Cast Iron topic in division Constitution of Alloys and Phase Diagrams of Engineering Material & Metallurgy

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Right answer is (b) Ledeburite

Easy explanation: Slow cooling of eutectic cast iron leads to precipitation of austenite of cementite. This combination of austenite and cementite is called ledeburite. This reaction occurs at 1148^oC.

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