Engineering Materials
A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as

Allotropic change
Heat treatment
Precipitation
Recrystallization

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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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