Rotating bending (52.5 Hz) and ultrasonic (20 kHz) fatigue tests were performed on the specimens of a bearing steel, which were quenched and tempered at 150 degrees C, 300 degrees C, 450 degrees C and 600 degrees C, respectively, to investigate the influence of strength level and loading frequency on the fatigue behavior in very-high-cycle regime. Influences on fatigue resistance of materials, characteristics of S-N curves and transition of crack initiation site were discussed. The specimens with higher strength showed interior fracture mode in very-high-cycle regime and with slight frequency effect, otherwise cracks all initiate from the surface and the fatigue strength was much higher under ultrasonic cycling. [DOI:10.1016/j.ijfatigue.2011.11.014]

This article was published as:
Zhao AG;Xie JJ;Sun CQ;Lei ZQ;Hong YS.Effects of strength level and loading frequency on very-high-cycle fatigue behavior for a bearing steel.INTERNATIONAL JOURNAL OF FATIGUE, 38:46-56(2012)