Engineering Materials
Combined carbon in iron makes the metal

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

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Engineering Materials
In spheroidising process, the steel is

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
Heated below the lower critical temperature and then cooled slowly

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