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Question 62

Thermal fatigue cracks usually initiate on the _________ of the component. They are generally wide and filled with oxides due to the elevated temperatures.

    Correct Answer: A

    Thermal fatigue cracks usually initiate on the surface of the component. These cracks are generally wide and filled with oxides due to exposure to elevated temperatures. This is because the surface is the area that experiences the most direct and severe temperature fluctuations, leading to thermal fatigue.

Discussion
ahmadmmOption: A

Thermal fatigue cracks usually initiate on the surface of the component, on either the ID or OD surface. They are generally wide and often filled with oxides due to elevated temperature exposure. Cracks may occur as single or multiple cracks.