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← ScienceWhich 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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