Abstract
Macro and micro-structure and hardness of hardened layer of induction hardened SUJ2 steel gears were measured, and profiles of hardened layers and effective hardened depths were obtained. Bending fatigue tests of induction hardened SUJ2 steel gears were carried out and S-N curves and bending fatigue limits were obtained. On the basis of these results, effects of heating time, pre-treatment and tempering on effective hardened depth and bending fatigue limits of induction hardened SUJ2 steel gears were clarified. Furthermore, these results were also compared with those of induction hardened S35C steel gears.
