Engineering Materials
For the allotropic forms of iron, the points of arrest are

The points where no further change occurs
The points where there is no further flow of metal
The points of discontinuity
Constant for all metals

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

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