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Which outcome occurs when a metallurgical sample undergoes rapid quenching?

A)Increased residual stress is generated
B)Grain boundary diffusion is accelerated
C)Equilibrium phase transformation completes
D)Ductility proportionally increases linearly

💡 Explanation

Quenching introduces thermal shock; therefore, differential cooling rates induce plastic deformation by the martensitic transformation. Increased volumetric strain causes increased residual stress, because volume changes are constrained, rather than boundary diffusion dominating at elevated temperatures.

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