Question

Reason of expansion of grey cast iron during solidification

Answer 1

It is due to presence of free carbon(graphite).Graphite expends on cooling.Any iron which is having carbides have less expansion on cooling and maximum expansion is in case of nodular/ductile iron. Yes, gray cast iron expands upon cooling unlike most other materials which contract on cooling.

Answer 2

Expansion in grey iron is due to presence of free carbon(graphite).Graphite expends on cooling.Any iron which is having carbides have less expansion on cooling and maximum expansion is in case of nodular/ductile iron. Yes, gray cast iron expands upon cooling unlike most other materials which contract on cooling.

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