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What is the effect of heat treatment on a metal?

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What is the effect of heat treatment on a metal?

(a) Improvement in availability

(b) Improved physical properties

(c) Decreased color

(d) Decreased availability

I have been asked this question in a job interview.

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

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Right option is (b) Improved physical properties

The explanation: Heat treatment improves/changes the physical properties of a given metal. It is a set of processes involving several different methods like hardening, drawing, etc. Heat treatment does not affect the availability of the metal.

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