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How does the rate of cooling affect the hardness of the metal?

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in Engineering Material & Metallurgy by (773k points)
How does the rate of cooling affect the hardness of the metal?

(a) Slow cooling, hard material

(b) Slow cooking, soft material

(c) Rapid cooling, soft material

(d) No effective change

This question was addressed to me in my homework.

My doubt stems from Annealing in section Heat Treatment of Engineering Material & Metallurgy

1 Answer

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Right answer is (b) Slow cooking, soft material

Easiest explanation: The rate of cooling is the controlling factor in developing either a hard or soft structure. Rapid cooling from critical range results in a hard structure, whereas very slow cooling gives a soft structure.

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