Abstract
The cast structure of M963 superalloy is greatly affected by the melt superheating treatment. Melt superheating treatment (below 1923 K) coarsens the grain structure and transforms the blocky MC carbide into Chinese-script one that mostly distributed in dendrite. However, when the melt superheating temperature reaches 2123 K, the grain structure becomes very fine equiaxed, and the morphology of MC carbide changes back to the blocky appearance.
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