Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Effect of Mn Addition on Rolling Contact Fatigue of C-Base Induction Hardened Bearing Steels

C계 유도경화 베어링강의 회전접촉 피로거동에 미치는 Mn 첨가의 영향

  • Jung, Kyung-Jo (Department of Metallurgical Engineering, Chonbuk National University) ;
  • Yoon, Kee-Bong (Korean Research Institute of Standards and Science, Materials Evaluation Center) ;
  • Choi, Byung-Young (Department of Metallurgical Engineering, Chonbuk National University)
  • 정경조 (전북대학교 공과대학 금속공학과) ;
  • 윤기봉 (한국표준과학연구원 소재특성평가센터) ;
  • 최병영 (전북대학교 공과대학 금속공학과)
  • Published : 1995.09.30
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Abstract

Effect of Mn addition on rolling contact fatigue of C-base induction hardened bearing steels has been investigated to develop inexpensive surface-hardened bearing steels with improved resistance to rolling contact fatigue. Fatigue tests were conducted in elasto-hydrodynamic lubricating conditions at a shaft speed of 5,000rpm, under max. Hertzian stress of $492kg/mm^2$. It was found in the C-Mn steels that effective depth of induction hardened layer and amount of retained austenite were slightly increased in comparison with those of C-base steels. finer interlamellar spacing of pearlite in the C-Mn steels was also observed using TEM. Decomposition of retained austenite during rolling contact fatigue was smaller in quantity in the C-Mn steels than C-base steels. This might be associated with enhanced mechanical stability of retained austenite with addition of Mn. Statistical analysis of fatigue life for C-Mn steels using Weibull distribution indicated that improved resistance to rolling contact fatigue was mainly attributed to transformation induced plasticity and mechanical stability of retained austenite.

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Acknowledgement

Supported by : 교육부