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How can temperature differences between center and surface be prevented?

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in Engineering Material & Metallurgy by (773k points)
How can temperature differences between center and surface be prevented?

(a) Refined grain structure

(b) Cooling to room temperature

(c) Hot working

(d) Addition of silicon

The question was asked in a national level competition.

This is a very interesting question from Interrupted Quenching topic in portion Heat Treatment of Engineering Material & Metallurgy

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Correct answer is (b) Cooling to room temperature

Explanation: Cooling the steel at moderate to room temperature prevents temperature differences between center and surface. This is usually done in air. The resulting microstructure of martempered steel is untempered martensite.

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