Engineering Materials
The purpose of heat treatment is to

Any one of these
Change grain size
Relieve the stresses set up in the material after hot or cold working
Modify the structure of the material

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Engineering Materials
Free carbon in iron makes the metal

Hard and gives a coarse grained crystalline structure
Soft and gives a coarse grained crystalline structure
Hard and gives a fine grained crystalline structure
Soft and gives a fine grained crystalline structure

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Engineering Materials
Specify the sequence correctly

Stress relief, grain growth, recrystallization
Stress relief, recrystallization, grain growth
Grain growth, recrystallization, stress relief
Grain growth, stress relief, recrystallization

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