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← TechnologyWhich mechanical failure arises in steel forging when rapid directional changes cool unevenly?
A)Quench cracking forms brittle regions✓
B)Strain hardening increases final toughness
C)Work softening mitigates thermal stress
D)Grain refinement optimizes tensile strength
💡 Explanation
Quench cracking occurs because rapid directional cooling during quenching generates excessive thermal stress exceeding the material's tensile strength; therefore, cracks propagate, embrittling the steel section rather than allowing uniform contraction.
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