Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Effects of Processing Time and Temperature on the Surface Properties of AISI 316L Stainless steel During Low Temperature Plasma Nitriding After Low Temperature Plasma Carburizing

AISI 316L stainless steel에 저온 플라즈마 침탄처리 후 질화처리 시 처리시간과 온도가 표면특성에 미치는 영향

  • Lee, Insup (Department of Advanced Materials Engineering, Dongeui University)
  • Received : 2007.12.12
  • Published : 2008.06.22
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Abstract

The 2-step low temperature plasma processes (the combined carburizing and post-nitriding) were carried out for improving both the surface hardness and corrosion resistance of AISI 316L stainless steel. The effects of processing time and temperature on the surface properties during nitriding step were investigated. The expanded austenite (${\gamma}_N$) was formed on all of the treated surface. The thickness of ${\gamma}_N$ was increased up to about $20{\mu}m$ and the thickness of entire hardened layer was determined to be about $40{\mu}m$. The surface hardness reached up to $1,200HV_{0.1}$ which is about 5 times higher than that of untreated sample ($250HV_{0.1}$). The thickness of ${\gamma}_N$ and concentration of N on the surface were increased with increasing processing time and temperature. The corrosion resistance in 2-step low temperature plasma processed austenitic stainless steels was enhanced more than that in the untreated austenitic stainless steels due to a high concentration of N on the surface.

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