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The specimens of a high carbon chromium steel were quenched and tempered at 150°C,180°C and 300°C.Such specimens were tested via rotating bending and a push-pull type of axial loading to investigate the influences of loading condition on the behaviour of very-high-cycle fatigue(VHCF).Experimental results show the different influences of inclusion size on the fatigue life for the two loading conditions.Predominant factors and mechanism for the fine-granular-area(FGA)of crack origin were discussed.In addition,a reliability analysis based on a modified Tanaka-Mura model was carried out to evaluate the sensitivity of inclusion size,stress,and KFGA to the life of VHCF crack initiation.
The specimens of a high carbon chromium steel were quenched and tempered at 150 ° C, 180 ° C and 300 ° C.Such specimens were tested via rotating bending and a push-pull type of axial loading to investigate the influences of loading condition on the behavioour of very-high-cycle fatigue (VHCF). Experimental results show the different effects of inclusion size on the fatigue life for the two loading conditions. Predominant factors and mechanism for the fine-granular-area (FGA) of crack origin were discussed .In addition, a reliability analysis based on a modified Tanaka-Mura model was carried out to evaluate the sensitivity of inclusion size, stress, and KFGA to the life of VHCF crack initiation.