Engineering Materials
For the allotropic forms of iron, the points of arrest are

The points of discontinuity
The points where no further change occurs
The points where there is no further flow of metal
Constant for all metals

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

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Engineering Materials
Cyaniding is the process of

Adding carbon and nitrogen by heat treatment of steel to increase its surface hardness
Dipping steel in cyanide bath
Reacting steel surface with cyanide salts
Obtaining cyanide salts

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