Question: Question 1 a) Describe the three grain structures that are formed after a metal has solidified. b) Most metals shrink during solidification, one of the

Question 1

a) Describe the three grain structures that are formed after a metal has solidified. b) Most metals shrink during solidification, one of the exceptions is gray cast iron (gray cast iron) it expands instead. Explain why? c) Why does cast metal have to undergo heat treatment?

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