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___________ is a eutectic mixture of α iron and Fe3C.

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___________ is a eutectic mixture of α iron and Fe3C.

(a) Pearlite

(b) Martensite

(c) Ledeburite

(d) Sorbite

This question was addressed to me in an interview for internship.

This key question is from Iron-Carbon System and their Alloys topic in division Constitution of Alloys and Phase Diagrams of Engineering Material & Metallurgy

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The correct option is (c) Ledeburite

The explanation: Ledeburite is known as the eutectic mixture of α iron (austenite) and Fe3C (cementite) containing 4.3% carbon. It forms at 1140^oC in the pure iron-carbon alloy.

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