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How does hot working affect grain structure?

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in Engineering Material & Metallurgy by (773k points)
How does hot working affect grain structure?

(a) Refines it

(b) Distorts it

(c) Warps it

(d) Has no effect

I got this question in an international level competition.

This is a very interesting question from Cryogenics, Hot and Cold Working of Metals in portion Mechanical Working Processes & Phase Transformations of Engineering Material & Metallurgy

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Best answer
Correct option is (a) Refines it

Best explanation: Although hot working refines the grain structure of the material, it does not improve its surface finish.  Cold working, on the other hand, improves surface finish while distorting the grain structure.

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