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Which risk increases when rapid temperature changes affect a polycrystalline metal turbine blade?

A)Intergranular stress corrosion cracking
B)Uniform grain boundary strengthening
C)Increased overall creep resistance
D)Enhanced fatigue resistance improvement

💡 Explanation

Intergranular stress corrosion cracking will occur because differential thermal expansion induces stress concentrations at grain boundaries, rather than creep resistance improvements occurring. Crack propagation follows these weakened gaps because intergranular corrosion attacks are more prone given high micro stresses; therefore cracking risk rises.

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