Engineering Materials
The purpose of heat treatment is to

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

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Engineering Materials
In spheroidising process, the steel is

Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C
Heated below the lower critical temperature and then cooled slowly
Heated up to the lower critical temperature and then cooled in still air
None of these

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