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← TechnologyWhich outcome occurs when forging die temperatures exceed the austenite recrystallization threshold?
A)Decreased grain boundary creep resistance✓
B)Increased fatigue crack propagation rate
C)Elevated surface hardness penetration depth
D)Reduced martensitic transformation start temperature
💡 Explanation
Decreased grain boundary creep resistance will occur due to grain growth at excessive temperature. This happens because the recrystallization process leads to larger grains. Therefore, resistance decreases, rather than hardness increasing which would require material phase changes at the surface.
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