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Which risk increases when forging large steel crankshafts using repeated closed-die impacts at gradually decreasing temperatures?

A)Cold shuts form internally
B)Eutectic transformation accelerates rapidly
C)Austenite grains achieve superplasticity
D)Strain energy promotes recrystallization

💡 Explanation

Cold shuts are more likely because viscous flow decreases with temperature during closed-die forging. The impact of repeated forging fails to eliminate pre-exiting laps or folds using diffusion bonding; therefore, cold shuts persist, rather than being healed at high temperatures or deformation.

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