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← TechnologyWhich failure in a forged turbine blade escalates when exposed to high blade temperature?
A)Creep crack propagation velocity improves✓
B)Grain boundary sliding contribution minimizes
C)Cyclic loading fatigue endurance improves
D)Tensile strength reaches maximum value
💡 Explanation
High temperatures accelerate creep, enabling creep crack propagation because the elevated temperature provides the energy for dislocations to move and cracks to grow. With faster propagation, ultimate fracture occurs more rapidly rather than if solely driven by normal fatigue at lower temperatures; therefore overall blade life decreases.
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