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

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

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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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