Engineering Materials
In spheroidising process, the steel is

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
Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C

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Engineering Materials
Recrystallization temperature is one

At which change of allotropic form takes place
At which crystals first start forming from molten metal when it is cooled
At which new spherical crystals first begin to form from the old deformed one when a strained metal is heated
At which crystals grow bigger in size

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Engineering Materials
Free carbon in iron makes the metal

Hard and gives a fine grained crystalline structure
Hard and gives a coarse grained crystalline structure
Soft and gives a coarse grained crystalline structure
Soft and gives a fine grained crystalline structure

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