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I asked my materials science proffesor if forging a cast part (inside a mold to prevent shape change) can increase it's strength to that of a forged part. She told me to find out myself and tell the group next lesson. I googled for a bit on post casting treatment but haven't got a clear answer to my question. Is it possible?

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Generally , no. That is more or less cold working , but the die prevents much strain , so very limited strain hardening / cold work. That could be called a "coining" operation. A special case could be a poor casting with gas porosity , shrinkage cracks or hot tears ; wherein the forging partially remedies some of these defects.

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  • $\begingroup$ what if the cast was above recrystalization temperature? $\endgroup$ – Francis L. Mar 3 at 15:26
  • $\begingroup$ As it recrystallizes it removes residual stress and cold work ; depending on specifics ,it anneals and lower strength.. $\endgroup$ – blacksmith37 Mar 3 at 22:42

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