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Influence of Super Carburization on the Roller Pitting Fatigue Life of 0.16C-0.60Si-2.00Cr-0.34Mo Steel

2012; The Korean Institute of Metals and Materials; Volume: 50; Issue: 7 Linguagem: Inglês

10.3365/kjmm.2012.50.7.517

2288-8241

Jungho Shin, Woon-Jae Lee, Young-Pyo Kim, In-Yong Ko,

Metallurgy and Material Forming

In this study, a super carburizing treatment was applied to improve roller pitting fatigue life. It produced excellent properties of surface hardness and temper softening resistance by forming precipitation of fine and spherodized carbides on a tempered marstensite matrix through the repeated process of carburization and diffusion after high temperature carburizing step 1. The cycle II performed two times carburizing/diffusion cycle (process) after super carburization at 1,000°C had fine and spherodized carbides to subsurface 200 μm. In this case, the carbide was (Fe,Cr)3C and there was not any massive carbides. In the case of Cycle II, the roller pitting fatigue life had a 6.15 million cycles. It was improved 48% compared to normal gas carburizing treatment. (Received March 14, 2012)