Engineering Materials
When low carbon steel is heated up to lower critical temperature

The grain size increases very rapidly
The grain size first increases and then decreases very rapidly
There is no change in grain size
The average grain size is a minimum

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Engineering Materials
Free carbon in iron makes the metal

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

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