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

Allotropic change
Physical change
Solidus change
Molecular change

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Engineering Materials
In spheroidising process, the steel is

None of these
Heated up to the lower critical temperature and then cooled in still air
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

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