Abstract
Notched and unnotched fatigue tests have been carried out on several ultrahigh strength alloy steels in the as-quenched condition and after tempering at progressively higher temperatures. The effect of residual quenching stress and secondary hardening stresses on the notch sensitivity of the steels has been evaluated. Minimum notch sensitivity was found in the as-quenched condition and after tempering to the peak of secondary hardening. The mechanism of failure is discussed in terms of the effect of residual stresses and metallurgical structure on the relief of applied peak stresses.
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