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Effects of Pre-Aging Treatment on the Corrosion Resistance of Low Temperature Plasma Nitrocarburized AISI 630 Martensitic Precipitation Hardening Stainless Steel

저온 플라즈마 침질탄화처리된 마르텐사이트계 석출경화형 스테인리스강의 내식성에 미치는 시효 전처리의 영향

  • Lee, Insup (Department of Advanced Materials Engineering, Dongeui university) ;
  • Lee, Chun-Ho (Department of Advanced Materials Engineering, Dongeui university)
  • 이인섭 (동의대학교 신소재공학과) ;
  • 이천호 (동의대학교 신소재공학과)
  • Received : 2020.02.05
  • Accepted : 2020.03.10
  • Published : 2020.04.30

Abstract

Various aging treatments were conducted on AISI 630 martensitic precipitation hardening stainless steel in order to optimize aging condition. Aging treatment was carried out in the vacuum chamber of Ar gas with changing aging temperature from 380℃ to 430℃ and aging time from 2h to 8h at 400℃. After obtaining the optimized aging condition, several nitrocarburizing treatments were done without and with the aging treatment. Nitrocarburizing was performed on the samples with a gas mixture of H2, N2 and CH4 for 15 h at vacuum pressure of 4.0 Torr and discharge voltage of 400V. The corrosion resistance was improved noticeably by combined process of aging and nitrocarburizing treatment, which is attributed to higher chromium and nitrogen content in the passive layer, as confirmed by XPS analysis. The optimized condition is finalized as, 4h aging at 400℃ and then subsequent nitrocarburizing at 400℃ with 25% nitrogen and 4% methane gas for 15h at vacuum pressure of 4.0 Torr and discharge voltage of 400V, resulting in the surface hardness of around 1300 HV0.05 and α'N layer thickness of around 11 ㎛ respectively.

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