Abstract
It is reported that clean steel with low oxygen content may be effective to improve the fatigue strength. In this paper, the bending fatigue tests were carried out for carburized gears made of clean steel and ordinary steel with oxygen content of 5 ppm and 8 ppm, respectively. After removing the nonmartensitic layers by electropolishing, the fatigue strength of the clean steel gear is 28% higher than that of the ordinary steel gear. To discuss the influence of cleanliness, the authors estimate the fatigue strength considering the distribution of inclusions. The maximum size of inclusions in the dangerous volume of gear tooth, which is calculated according as the stress distribution of fillet including the position of crack initiation, is estimated by the statistics of extremes. Then the fatigue strength is estimated by using the maximum size of inclusion and the estimation formula proposed by the authors.
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