대한금속재료학회지 (Korean Journal of Metals and Materials)

  • 제47권10호
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  • Pages.629-634
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  • 2009
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  • 1738-8228(pISSN)
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  • 2288-8241(eISSN)
대한금속재료학회 (The Korean Institute of Metals and Materials)
권호 표지

내식성 및 표면경도 향상을 위한 AISI 304L 스테인리스강의 저온 플라즈마질화 프로세스

Low Temperature Plasma Nitriding Process of AISI 304L Austenitic Stainless Steels for Improving Surface Hardness and Corrosion Resistance

  • Lee, In-Sup (Department of Advanced Materials Engineering, Dongeui University)
  • 투고 : 2009.01.10
  • 발행 : 2009.10.25
⟨ 이전 논문 다음 논문 ⟩

초록

The effects of processing parameters on the surface properties of the hardened layers processed by the low temperature plasma nitrocarburizing and the low temperature two-step plama treatment (carburizing+nitriding) were investigated. The nitrogen-enriched expanded austenite structure (${\gamma}_N$) or S phase was formed on all of the treated surface. The surface hardness reached up to 1200 $HV_{0.025}$, which is about 5 times higher than that of untreated sample (250 $HV_{0.1}$). The thickness of hardened layer of the low temperature plasma nitrocarburized layer treated at $400^{\circ}C$ for 40 hour was only $15{\mu}m$, while the layer thicknesss in the two-step plama treatment for the 30 hour treatment increased up to about $30{\mu}m$. The surface thickness and hardness increased with increasing treatment temperature and time. In addition, the corrosion resistance was enhanced than untreated samples due to a high concentration of N on the surface. However, higher treatment temperature and longer treatment time resulted in the formation of $Cr_2N$ precipitates, which causes the degradation of corrosion resistance.

키워드

과제정보

연구 과제 주관 기관 : 한국학술진흥재단

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