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← TechnologyIn closed-die forging of landing gear components, which outcome arises when the initial billet temperature exceeds the steel's recrystallization point?
A)Increased grain isotropy, strength
B)Decreased residual stress, hardness
C)Grain boundary diffusion, creep✓
D)Enhanced elastic modulus, ductility
💡 Explanation
Exceeding the recrystallization temperature in forging allows grain boundary diffusion enhanced creep because thermal energy overcomes activation energy to mass transport. Creep occurs, leading to dimensional instability and loss of tolerance, rather than strengthening as it's closer to hot working.
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