Which risk increases when a turbine blade's crystal lattice contains larger grain boundaries?

💡 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.

• Which risk increases in a steam turbine when saturated steam experiences sudden pressure drops?
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