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Which element causes cementite to behave in a stable manner?

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Which element causes cementite to behave in a stable manner?

(a) Silicon

(b) Sulphur

(c) Manganese

(d) Carbon

This question was posed to me during an interview.

Question is from Cast Irons topic in portion Non Ferrous Materials of Engineering Material & Metallurgy

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The correct option is (b) Sulphur

Explanation: Sulphur has a stabilizing effect in cementite. This helps it easily break the cementite and produce white iron.

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