Engineering Materials
In a hardening process, the hypo-eutectoid steel is

Heated below or closes to the lower critical temperature and then cooled slowly
Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace
Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium

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Engineering Materials
Amorphous material is one

In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid
In which atoms align themselves in a geometric pattern upon solidification
Which is not attacked by phosphorous
Which emits fumes on melting

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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 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

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