AISI304L 강에 저온 플라즈마침탄 처리 시 처리조건에 따른 표면특성평가
The Influence of Treatment Condition During Low Temperature Plasma Carburizing of AISI304L Stainless Steel
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A low temperature plasma carburizing process was performed to AISI 304L austenitic stainless steel to achieve the enhancement of surface hardness without a compromise in their corrosion resistance. Attempts were made to investigate the influence of the processing temperatures on the surface-hardened layer during low temperature plasma carburizng in order to obtain the optimum processing conditions. The expanded austenite (γC) was formed on all the treated surfaces. Precipitates of chromium carbides were detected in the hardened layer (C-enriched layer) only for the specimen treated at 500℃. The hardened layer thickness of γC increased up to about 35 μm, with increasing treatment temperature. The surface hardness reached about 1000 HK_0.05, which is about 4 times higher than that of the untreated sample (250 HK_0.05). Minor loss in corrosion resistance was observed for the specimens treated at temperatures of 310℃-450℃ compared with untreated austenitic stainless steel. Particularly,the precipitation of chromium carbides at 500℃ led to a significant decrease in the corrosion resistance.
Abstract
A low temperature plasma carburizing process was performed to AISI 304L austenitic stainless steel to achieve the enhancement of surface hardness without a compromise in their corrosion resistance. Attempts were made to investigate the influence of the processing temperatures on the surface-hardened layer during low temperature plasma carburizng in order to obtain the optimum processing conditions. The expanded austenite (γC) was formed on all the treated surfaces. Precipitates of chromium carbides were detected in the hardened layer (C-enriched layer) only for the specimen treated at 500℃. The hardened layer thickness of γC increased up to about 35 μm, with increasing treatment temperature. The surface hardness reached about 1000 HK_0.05, which is about 4 times higher than that of the untreated sample (250 HK_0.05). Minor loss in corrosion resistance was observed for the specimens treated at temperatures of 310℃-450℃ compared with untreated austenitic stainless steel. Particularly,the precipitation of chromium carbides at 500℃ led to a significant decrease in the corrosion resistance.
참고문헌 (8)
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