Engineering Materials
The lower critical temperature

Is same for all steels
Increases as the carbon content in steel increases
Depends upon the rate of heating
Decreases as the carbon content in steel increases

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Engineering Materials
Free carbon in iron makes the metal

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

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