In this study, the effect of alloying elements on microstructures and fatigue strength of vacuum carburized specimens were investigated. The edge specimens whose edge angle was varied from 60 to 150 degree, were used in the bending tests. In high Cr and low Si steel, the surface carbon content increased with the sharpness of the corner, in which coarse carbides were observed, and resulted in lower fatigue strength. On the other hand, in low Cr and high Si steel, the increase in the carbon content of the sharp corner was smaller comparing with the former steel, and carbides were not precipitated in the case. The fatigue strength of carburized low Cr-high Si steel was kept high without depending on the edge angle of the specimens.
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