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Which outcome accelerates microcrack growth on turbine blades?

A)Thermal fatigue crack propagation
B)Increased blade creep resistance
C)Reduced oxidation scale formation
D)Isothermal forging hardening improvement

💡 Explanation

Thermal fatigue crack propagation accelerates crack growth because cyclical heating and cooling causes repeated stress concentration at microcrack tips, leading to their gradual expansion rather than improved material properties or protective surfaces, therefore faster crack initiation.

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