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Heating of 4.8% cast iron at _______ results in the formation of liquid metal.

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Heating of 4.8% cast iron at _______ results in the formation of liquid metal.

(a) 450^oC

(b) 650^oC

(c) 950^oC

(d) 1450^oC

The question was posed to me at a job interview.

Question is taken from Transformation of Steel and Cast Iron topic in portion Constitution of Alloys and Phase Diagrams of Engineering Material & Metallurgy

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The correct choice is (d) 1450^oC

Easy explanation: If a sample of 4.8% cast iron is heated to about 1450^oC for a sufficient time, its structure becomes a homogeneous liquid metal. If this cast iron is slowly cooled, cementite crystals nucleate and grow in the liquid phase.

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