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자료유형
학술저널
저자정보
이인섭 (동의대학교)
저널정보
한국표면공학회 한국표면공학회지 한국표면공학회지 제52권 제4호
발행연도
2019.8
수록면
194 - 202 (9page)

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A systematic investigation was made on the influence of processing parameters such as gas composition and treatment temperature on the surface characteristics of hardened layers of low temperature plasma nitrided 316L Austenitic Stainless Steel. Various nitriding processes were conducted by changing temperature (370℃ to 430℃) and changing N2 percentage (10% to 25%) for 15 hours in the glow discharge environment of a gas mixture of N2 and H2 in a plasma nitriding system. In this process a constant pressure of 4 Torr was maintained. Increasing nitriding temperature from 370℃ to 430℃, increases the thickness of S phase layer and the surface hardness, and also makes an improvement in corrosion resistance, irrespective of nitrogen percent. On the other hand, increasing nitrogen percent from 10% to 25% at 430℃ decreases corrosion resistance although it increases the surface hardness and the thickness of S phase layer. Therefore, optimized condition was selected as nitriding temperature of 430℃ with 10% nitrogen, as at this condition, the treated sample showed better corrosion resistance. Moreover to further increase the thickness of S phase layer and surface hardness without compromising the corrosion behavior, further research was conducted by fixing the N₂ content at 10% with introducing various amount of CH₄ content from 0% to 5% in the nitriding atmosphere. The best treatment condition was determined as 10% N₄ and 5% CH₄ content at 430℃, where the thickness of S phase layer of about 17 μm and a surface hardness of 980 HV0.1 were obtained (before treatment 250 HV0.1 hardness). This specimen also showed much higher pitting potential, i.e. better corrosion resistance, than specimens treated at different process conditions and the untreated one.

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Abstract
1. 서론
2. 실험방법
3. 결과 및 고찰
4. 결론
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