The Effect of Sursulf Treating Time and Traveling Speed during Induction Hardening on Hardness and Wear Characteristics of Low Carbon Steel Combined-Heat-Treated

Sursulf 처리후 고주파 표면경화된 저탄소강의 경도 및 마모특성에 미치는 Sursulf 처리시간 및 고주파 경화 이송속도의 영향

This study has been performed to investigate into some effects of the Sursulf treatment time and the traveling speed of surface hardening treatment on the hardness and the wear characteristics by applying the combined heat treating techniques of Sursulf process followed by induction hardening treatment to mild steel. It has been shown that increasing the Sursulf treatment time increases the case depth, but both hardness and wear resistance are not considerably improved. When the combined heat treating technique of high frequency induction heating after Sursulf treatment is applied, an improvement in case depth as well as wear resistance is obtained. In particular, the hardness in diffusion zone is greatly increased due mainly to the formation of martensite and possibly lower bainite. Iron oxides formed during induction heating and subsequent water spray cooling in the outermost part of compound layer may be considered to cause some increases in hardness and wear resistance.