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← TechnologyWhich outcome occurs when thermal stress exceeds turbine disc endurance?
A)Increased creep crack propagation rate✓
B)Decreased turbine blade leading distortion
C)Enhanced compressive pre-stress retention
D)Improved oxidation resistance coating bonding
💡 Explanation
Increased creep crack propagation results because thermal stress concentrates at pre Nickel-alloy grain boundaries, initiating the Larson-Miller Parameter mechanism exceeding threshold. Therefore accelerated crack growth occurs towards turbine blade failure, rather than slower crack growth at lower stress.
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