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← TechnologyWhich risk increases when forging close-tolerance gears at excessively high temperatures?
A)Austenite grain growth occurs rapidly✓
B)Ferrite precipitation strengthens rapidly
C)Martensite formation lowers hardness
D)Cementite decomposition improves ductility
💡 Explanation
Excessive forging temperatures accelerate austenite grain growth due to increased atomic diffusion; this weakens grain boundaries because larger grains provide less boundary area. Therefore, toughness decreases, rather than the precipitation of other phases strengthening the material at forging temps.
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