Abstract
It seems to be possible to heat treat the gears having higher fatigue strength with lower distortion by applying newly developed super rapid induction heating and quenching (SRIHQ) technology. In this previous research, rotating bending fatigue properties of S 45 C tempered martensite structure plane specimens heat treated by SRIHQ having shallower hardened layer and higher compressive residual stress were studied, and it was observed that the fatigue strength was not improved due to the fatigue cracks initiation just beneath the shallow hardened layer. In the present research, rotating bending fatigue properties of same specimens with notch (α=2.3) heat treated by SRIHQ were studied. As a result, on the contrary of previous work, much higher fatigue strength was obtained in spite of shallow hardened layer. The compressive residual stress formed at the bottom of notch is extremely high (2000 MPa) due to the effect of stress concentration.
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