Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Analysis of Surface Compound for Austanitic Nitrocarburized High Carbon Chromium Bearing Steel

오스테나이트 침질탄화 처리한 고탄소 크롬 베어링강의 표면층 분석

  • Kim, C.S. (Department of Metallurgical Engineering, Chonbuk National University) ;
  • Jin, J.K. (Department of Metallurgical Engineering, Chonbuk National University) ;
  • Kim, D.K. (Department of Metallurgical Engineering, Chonbuk National University)
  • 김창석 (전북대학교 공과대학 금속공학과) ;
  • 진재관 (전북대학교 공과대학 금속공학과) ;
  • 김동건 (전북대학교 공과대학 금속공학과)
  • Published : 1995.12.31
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Abstract

To investigate the characteristics of nitrocarburizing for high carbon chromium bearing steel, it was undertaken 4 hours holding at $850^{\circ}C$ in the atmosphere containing 60% endothermic gas and 40% ammonia. The microstructure of nitrocarburized surface consists of ${\varepsilon}-Fe_{2-3}N$, ${\gamma}^{\prime}-Fe_4N$, $Fe_3C$ and $Fe_3$(C,N), and the ${\varepsilon}$-nitride was rich in the surface-internal part. The nitrocarburized surface contains a larger volume fraction of primary carbonitrides and has more retained austenite and is slightly harder than the interior.

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