Abstract
A method for estimating the fatigue strength of smoothed and tufftrided specimens from the measurements of temperature rise in the specimens during rotating bending fatigue test was applied on three kinds of S15CK specimens with different tufftriding treatment time as well as on S45C and SCM3 specimens.
The fatigue strengths of the tufftrided S15CK specimens with three different treated times were found to be estimatable by means of heat generation rate. It seems that the fatigue strength of the tufftrided S45C specimen can be estimated, because the temperature rise of the specimen had a similar tendency to that of the tufftrided S15CK specimens.
However, this method for estimating the fatigue strength from heat generation rate was not applicable to the tufftrided SCM3 specimen, because the temperature rise of the specimen had a different tendency from those of both tufftrided low and middle carbon steels. Therefore, the fatigue strength of the specimen was estimated from the rate of mean temperature rise. However, the applicability of this method should be examined in future.
