Abstract
In order to investigate the fatigue properties of high strength steels and surface hardened steels in the super-long life range (N&ge1×(10)^7), cantilever type rotating bending fatigue tests were carried out for the SUJ2 high carbon chromium bearing steel which was finished by the electro-polishing. The surface of notch bottom was removed up to 30μm deep by electro-polishing because the depth of residual stress in the notch bottom of grinding specimen has been 20μm. As a result of fatigue tests, in the case of "surface crack origin type fracture", it was found that the fatigue life of eletctro-polishing specimen were shorter than that of grinding specimen. In the case of "interior crack origin type fracture", it was found that the fatigue life of electro-polishing specimen were almost equal to that of grinding specimen. The causes for this are discussed.
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