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← TechnologyWhich increased risk follows prolonged forging die chilling?
A)Increased fatigue crack propagation rate✓
B)Reduced material grain boundary corrosion
C)Decreased inclusion precipitation hardening effects
D)Elevated bulk recrystallization temperature threshold
💡 Explanation
Fatigue crack propagation accelerates because the chilling induces localized thermal gradients, thus creating uneven stress distribution via thermal stress concentration. Therefore, crack growth is expedited rather than mitigated, because temperature variations impact grain boundary cohesion.
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