AISI 316L stainless steel에 저온 플라즈마 침탄 및 질화처리 시 가스조성이 표면특성에 미치는 영향
Effects of Gas Composition on the Characteristics of Surface Layers Produced on AISI316L Stainless Steel during Low Temperature Plasma Nitriding after Low Temperature Plasma Carburizing
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초록
The 2-step low temperature plasma processes (the combined carburizing and post-nitriding) offer the increase of both surface hardness and thickness of hardened layer and corrosion resistance than the individually processed low temperature nitriding and low temperature carburizing techniques. The 2-step low temperature plasma processes were carried out for improving both the surface hardness and corrosion resistance of AISI 316L stainless steel. The influence of gas compositions on the surface properties during nitriding step were investigated. The expanded austenite (gN) was formed on all of the treated surface. The thickness of gN and concentration of N on the surface increased with increasing both nitrogen gas and Ar gas levels in the atmosphere. The thickness of gN increased up to about 20mm and the thickness of entire hardened layer was determined to be about 40mm. The surface hardness was independent of nitrogen and Ar gas contents and reached up to about 1200 HV0.1 which is about 5 times higher than that of untreated sample (250 HV0.1). The corrosion resistance in 2-step low temperature plasma processed austenitic stainless steels was also much enhanced than that in the untreated austenitic stainless steels due to a high concentration of N on the surface.
Abstract
The 2-step low temperature plasma processes (the combined carburizing and post-nitriding) offer the increase of both surface hardness and thickness of hardened layer and corrosion resistance than the individually processed low temperature nitriding and low temperature carburizing techniques. The 2-step low temperature plasma processes were carried out for improving both the surface hardness and corrosion resistance of AISI 316L stainless steel. The influence of gas compositions on the surface properties during nitriding step were investigated. The expanded austenite (gN) was formed on all of the treated surface. The thickness of gN and concentration of N on the surface increased with increasing both nitrogen gas and Ar gas levels in the atmosphere. The thickness of gN increased up to about 20mm and the thickness of entire hardened layer was determined to be about 40mm. The surface hardness was independent of nitrogen and Ar gas contents and reached up to about 1200 HV0.1 which is about 5 times higher than that of untreated sample (250 HV0.1). The corrosion resistance in 2-step low temperature plasma processed austenitic stainless steels was also much enhanced than that in the untreated austenitic stainless steels due to a high concentration of N on the surface.
참고문헌 (10)
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