Abstract
Very high cycle fatigue (VHCF) of high carbon chromium bearing steel 100Cr6 (SAE52100; JISSUJ2) is investigated with ultrasonic fatigue testing for compressive mean stresses with minimum stresses σmin at compressive yield stress σCY, for σmin = 0.59σCY, and for load ratio R = −1. Fatigue limits are found for σmin = σCY and for σmin = 0.59σCY, whereas no fatigue limit below 109 cycles exists at R = −1. Cracks leading to VHCF failures exclusively start at interior inclusions. Considering inclusions as cracks, the maximum stress intensity factor of a load cycle being below the effective threshold stress intensity factor determines the fatigue limit.
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