工程科学学报，第38卷，第2期：235-240,2016年2月 Chinese Journal of Engineering,Vol.38,No.2:235-240,February 2016 DOI:10.13374/j.issn2095-9389.2016.02.012:http://journals.ustb.edu.cn 低温盐浴渗氮对Custom465钢耐蚀及耐磨性的影响 付航涛”，张津)四，吴帅)，黄进峰》，高文”，连勇” 1)北京科技大学新材料技术研究院，北京1000832)北京科技大学新金属材料国家重点实验室，北京100083 ☒通信作者，E-mail:zhangiin@usth.edu.cn 摘要为了提高Custom465马氏体沉淀硬化不锈钢的耐磨性，分别在440、480和520℃对580℃时效后的样品进行了2h 的盐浴渗氮，使用显微硬度计、X射线衍射仪、电化学工作站、球盘式摩擦磨损仪、表面轮廓仪、扫描电镜等设备，研究渗氮温 度对Custom465钢表面物相、硬度、渗层显微形貌、耐蚀性及耐磨性的影响.随着渗氮温度升高，耐蚀性逐渐降低，但表面硬 度增加，520℃处理后表面硬度增大到1240HV,较未处理试样的400HV明显上升，渗层厚度达到22μm.440℃渗氮后表面物 相为氮在马氏体基体中过饱和的a,点蚀电位降低约60mV:480℃时有少量CN相析出，引起点蚀电位降低约180mV,同时 磨损体积下降约43%：520℃时CN相的含量明显升高，自腐蚀电位降低约70mV,无明显的稳态钝化区，磨损体积降低82%， 减磨效果明显 关键词不锈钢：钢腐蚀：渗氮：耐蚀性：耐磨性 分类号TG142.71:TG174.44 Effect of low-temperature salt bath nitriding on the corrosion and wear resistance of Custom 465 FU Hang-tao,ZHANG Jin,WU Shuai,HUANG Jin-feng?,GAO Wen,LIAN Yong 1)Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China 2)State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:zhangjin@ustb.edu.en ABSTRACT To improve the wear resistance of maraging stainless steel Custom 465,the 580 C aged steel was modified by salt bath nitriding at 440,480 and 520C for 2h,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 C,the surface hardness is 1240 HV,much greater than 400 HV of the unnitrided specimen,and the case depth is 22 um.The surface phase is nitro- gen supersaturated solid solution in the martensite substrate at 440 C and the pitting potential decreases by about 60 mV.A small quantity of CrN precipitates at 480C,which decreases the pitting potential by about 180 mV and reduces the wear volume by 43%. The CrN content significantly increases at 520C,the corrosion potential decreases by about 70mV,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 520C nitrided sample has a better wear resistance. KEY WORDS stainless steel;steel corrosion:nitriding:corrosion resistance:wear resistance 马氏体沉淀硬化不锈钢兼具马氏体时效钢良好的力学性能和不锈钢的耐蚀性四.基体含碳量很低， 收稿日期：2015-11-20工程科学学报，第 38 卷，第 2 期: 235--240，2016 年 2 月 Chinese Journal of Engineering，Vol． 38，No． 2: 235--240，February 2016 DOI: 10． 13374 /j． issn2095--9389． 2016． 02． 012; http: / /journals． ustb． edu． cn 低温盐浴渗氮对 Custom 465 钢耐蚀及耐磨性的影响 付航涛1) ，张 津1) ，吴 帅1) ，黄进峰2) ，高 文1) ，连 勇1) 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  通信作者，E-mail: zhangjin@ ustb． edu． cn 摘 要 为了提高 Custom 465 马氏体沉淀硬化不锈钢的耐磨性，分别在 440、480 和 520 ℃ 对 580 ℃ 时效后的样品进行了 2 h 的盐浴渗氮，使用显微硬度计、X 射线衍射仪、电化学工作站、球盘式摩擦磨损仪、表面轮廓仪、扫描电镜等设备，研究渗氮温 度对 Custom 465 钢表面物相、硬度、渗层显微形貌、耐蚀性及耐磨性的影响． 随着渗氮温度升高，耐蚀性逐渐降低，但表面硬 度增加，520 ℃处理后表面硬度增大到 1240 HV，较未处理试样的 400 HV 明显上升，渗层厚度达到 22 μm． 440 ℃渗氮后表面物 相为氮在马氏体基体中过饱和的 α' N，点蚀电位降低约 60 mV; 480 ℃时有少量 CrN 相析出，引起点蚀电位降低约 180 mV，同时 磨损体积下降约 43% ; 520 ℃时 CrN 相的含量明显升高，自腐蚀电位降低约 70 mV，无明显的稳态钝化区，磨损体积降低 82% ， 减磨效果明显． 关键词 不锈钢; 钢腐蚀; 渗氮; 耐蚀性; 耐磨性 分类号 TG142. 71; TG174. 44 Effect of low-temperature salt bath nitriding on the corrosion and wear resistance of Custom 465 FU Hang-tao1) ，ZHANG Jin1)  ，WU Shuai1) ，HUANG Jin-feng2) ，GAO Wen1) ，LIAN Yong1) 1) Institute for Advanced Materials and Technology，University of Science and Technology Beijing，Beijing 100083，China 2) State Key Laboratory for Advanced Metals and Materials，University of Science and Technology Beijing，Beijing 100083，China  Corresponding author，E-mail: zhangjin@ ustb． edu． cn 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 22 μm． 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． KEY WOＲDS stainless steel; steel corrosion; nitriding; corrosion resistance; wear resistance 收稿日期: 2015--11--20 马氏体沉淀硬化不锈钢兼具马氏体时效钢良好 的力学性能和不锈钢的耐蚀性［1］． 基体含碳量很低