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← ScienceWhich risk increases when a turbine blade's crystal lattice contains larger grain boundaries?
A)Reduced thermal fatigue resistance
B)Increased creep rate at temperature✓
C)Decreased material density overall
D)Higher resonant frequency oscillation
💡 Explanation
Increased grain boundary area promotes grain boundary sliding. This creep occurs because the increased surface area of the grain boundaries allows dislocations move more easily, weakening the material. Therefore, higher temperature creep is the risks, rather than increased thermal fatigue because of oxidation.
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