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Casehardening refers to _________ the material, after which necessary heat treatment is done to it.

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Casehardening refers to _________ the material, after which necessary heat treatment is done to it.

(a) annealing

(b) critical range

(c) carburizing

(d) hardening

This question was addressed to me in homework.

The question is from Heat Treatment Terms topic in chapter Physical Test & Heat Treatment Terms of Aerospace Materials & Processes

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The correct option is (c) carburizing

To explain: In casehardening, the material has to first undergo carburizing. Then, the material is subjected to heat treatment. This is done to harden the surface of the material. Critical range is a range of temperatures at which the structure of a metal changes.

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