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Which outcome occurs when rapid, repeated heat cycling of steel turbine blades exceeds design parameters?

A)Elevated creep deformation accumulates significantly
B)Austenite grains transform to pearlite
C)Embrittlement decreases notch toughness
D)Martensite formation ceases entirely

💡 Explanation

Elevated creep deformation accumulates because thermal stresses cause microstructural changes during each cycle; specifically, thermal fatigue through dislocation climb increases strain. Therefore, permanent deformation results, rather than phase transformations or other metallurgical changes under stress without heat.

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