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In heat treatment of materials, the purpose of annealing is totally opposite to that of hardening.

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in Casting-Forming-Welding II by (119k points)
In heat treatment of materials, the purpose of annealing is totally opposite to that of hardening.

(a) True

(b) False

This question was addressed to me at a job interview.

Origin of the question is Method of Heat Treatment topic in portion Heat treatment of Metals and Alloys of Casting-Forming-Welding II

1 Answer

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by (701k points)
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Right choice is (a) True

Explanation: In general, the purpose of annealing is just the opposite of hardening. In annealing process, metal is treated to relieve internal stresses and to get soften or ductile by refining their grain structures. And the purpose of hardening is to harden the metal, which also increases its strength by decreasing its ductility.

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