Effect of high-temperature thermomechanical treatment (HTMT) on the fatigue strength of high-carbon steels
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Fatigue tests on steels 9KhS and ShKh15 revealed anisotropy in fatigue properties of these steels after HTMT.
In asymmetric cycling, the fatigue limit depends to a large extent on the magnitude and direction of the mean stress of the cycle. Superimposition of a direct load (in the entire range of τ0 studied) increases the fatigue limit (sometimes by 100%), of steel subjected to HTMT; when an inverse load is superimposed, the fatigue limit after HTMT is lower than after a conventional heat treatment.
The increase in fatigue strength of high-carbon steels after HTMT is achieved in the first instance as a result of the directional congruence of “weak” regions and external stresses. This effect becomes particularly evident under conditions of asymmetric stress cycling with a superimposed static load.
KeywordsFatigue Heat Treatment Fatigue Strength Fatigue Test Fatigue Limit
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