Engineering Materials
Recrystallization temperature can be lowered by

Grain refinement
Purification of metal
Working at lower temperature
All of these

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Engineering Materials
In spheroidising process, the steel is

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

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