Abstract
It is reported that a clean steel with low oxygen content is effective to improve the fatigue strength. In this paper, the bending fatigue tests are carried out for carburized gears made of clean steel and ordinary steel with oxygen content of 5ppm and 8ppm, respectively. After removing the nonmartensitic layers by electropohshing, the fatigue strength of the clean steel gear is 28% higher than that of the ordinary steel gear. To discuss the influence of cleanliness, we estimate the fatigue strength considering the distribution of inclusions, and validate the estimated value.
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