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← TechnologyWhich outcome occurs when exceeding thermal tolerances during induction hardening?
A)Grain growth and reduced hardness✓
B)Increased compressive residual stresses
C)Enhanced martensite formation uniformly
D)Reduced risk of surface cracking
💡 Explanation
Exceeding recommended temperature limits leads to excessive grain growth because the increased energy overcomes activation barriers for grain boundary movement, therefore reduces material hardness, rather than the other options related to stress or martensite.
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