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Question 68

Heat treatment can have a significant effect on the toughness and hence fatigue resistance of a metal. In general, ________ grained microstructures tend to perform better than _________ grained.

    Correct Answer: A

    Heat treatment can significantly affect the toughness and fatigue resistance of a metal. In general, fine-grained microstructures tend to perform better because they hinder crack propagation and enhance the mechanical properties, making the metal tougher and more resistant to fatigue compared to coarse-grained structures.

Discussion
ahmadmmOption: A

Heat treatment can have an effect on fatigue resistance of a metal. In general, finer-grained microstructures tend to perform better than coarse grained. Heat treatments such as quenching and tempering can improve fatigue resistance of carbon and low-alloy steels.