EFFECT OF SURFACE TREATMENT ON ULTRA LONG LIFE FATIGUE BEHAVIOR IN HIGH CARBON-CHROMIUM BEARING STEEL
LianTao Lu
西南交通大学
Cite this article:
LianTao Lu. EFFECT OF SURFACE TREATMENT ON ULTRA LONG LIFE FATIGUE BEHAVIOR IN HIGH CARBON-CHROMIUM BEARING STEEL. Acta Metall Sin, 2006, 42(5): 515-520 .
Abstract In order to investigate the effect of surface treatment on fatigue behavior of high strength steel in ultra long life regime, cantilever-type rotating-bending fatigue tests were performed in laboratory air at room temperature using hour-glass-shaped specimens of high carbon-chromium bearing steel, JIS SUJ2, with three kinds of surface treatment, which can induce residual stress and hardening in the specimen surface layer. Surface treatments included superoll processing, fine-particle and conventional particle shot-peening. The results obtained are summarized as follows: (1) After surface treatment, fatigue crack initiation site in high cycle region transfers from subsurface in a ground specimen to interior of the specimen, where compressive residual and hardened layer vanish. The largest transference is attributed to the superoll processing specimen, followed by the conventional particle shot-peening one and the smallest is fine-particle shot-peening one. (2) After sur-face treatment, stress gradient of bending fatigue and tensile residual stress exist at fatigue crack initiation site, and affect the fatigue strength of nominal stress amplitude. Fatigue strength of the superoll processing speci-men is improved due to the deeper stress gradient of bending fatigue as compared with the ground specimen. However, that of the shot-peening specimen is not improved. (3) Fatigue strength of high strength steel in ultra long life regime under rotating-bending can be improved by surface treatment which must induce smaller ten-sile residual stress and deeper compression residual stress distribution in surface layer of the material.
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