工程科学学报2016，Vol.38Issue(2)：235-240,6.DOI:10.13374/j.issn2095-9389.2016.02.012
低温盐浴渗氮对Custom 465钢耐蚀及耐磨性的影响
Effect of low-temperature salt bath nitriding on the corrosion and wear resistance of Custom 465
付航涛 1张津 1吴帅 1黄进峰 2高文 1连勇1
作者信息
- 1. 北京科技大学新材料技术研究院, 北京100083
- 2. 北京科技大学新金属材料国家重点实验室, 北京100083
- 折叠
摘要
Abstract
To improve the wear resistance of maraging stainless steel Custom 465, the 580℃ aged steel was modified by salt bath nitriding at 440, 480 and 520℃ for 2 h, respectively. The surface phases and hardness, the microstructure of the nitrided layer, and the corrosion and wear resistance of the steel were characterized by microhardness testing, X-ray diffractometry, electrochemical corro-sion workstation, ball-on-disc tribometry, surface profilometry, and scanning electron microscopy. With increasing nitriding tempera-ture, the surface hardness increases but the corrosion resistance decreases. When the nitriding temperature is 520℃, the surface hardness is 1240 HV, much greater than 400 HV of the unnitrided specimen, and the case depth is 22μm. The surface phase is nitro-gen supersaturated solid solution in the martensite substrate at 440℃ and the pitting potential decreases by about 60 mV. A small quantity of CrN precipitates at 480℃, which decreases the pitting potential by about 180 mV and reduces the wear volume by 43%. The CrN content significantly increases at 520℃, the corrosion potential decreases by about 70 mV, and no passive region appears in the polarization region. The wear volume gets a significant reduction, about 82% less than that of the unnitrided sample. The 520℃nitrided sample has a better wear resistance.关键词
不锈钢/钢腐蚀/渗氮/耐蚀性/耐磨性Key words
stainless steel/steel corrosion/nitriding/corrosion resistance/wear resistance分类
矿业与冶金引用本文复制引用
付航涛,张津,吴帅,黄进峰,高文,连勇..低温盐浴渗氮对Custom 465钢耐蚀及耐磨性的影响[J].工程科学学报,2016,38(2):235-240,6.
