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← TechnologyWhich outcome occurs when hammer forging exceeds material temper?
A)Work hardening induces surface cracks✓
B)Internal stresses cause shape distortion
C)Grain alignment increases machinability
D)Recrystallization strengthens carbide precipitation
💡 Explanation
Surface cracks happen because exceeding the material’s temper during forging initiates the mechanism of work hardening. Therefore, surface embrittlement causes cracking, rather than the metal deforming gracefully or recrystallizing, due to excessive energy input and localized stress concentrations beyond material yield.
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