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Which risk increases when grinding turbine blades post-casting?

A)Metastable austenite phase transformation occurs
B)Increased compressive residual stress buildup
C)Abrasive grit size becomes inconsistent
D)Electrochemical potential shifts to anodic

💡 Explanation

Heat generation during grinding induces a martensitic transformation because the temperature rises rapidly above the austenite finish temperature, therefore creating a hard, brittle, untempered martensite surface layer, rather than desired ductile metallic characteristics.

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