钛改性离子渗氮处理对沉淀硬化钢性能的影响  

Effect of Ti⁃modified plasma nitriding on properties of precipitation⁃hardened steel

作　　者：李峰 Li Feng(School of Mechanical Engineering,Donghua University,Shanghai 201620,China;ZRIME Gearing Technology Co.,Ltd.,Zhengzhou Henan 450002,China)

机构地区：[1]东华大学机械工程学院,上海201620 [2]郑机所(郑州)传动科技有限公司,河南郑州450002

出　　处：《金属热处理》2024年第8期183-189,共7页Heat Treatment of Metals

基　　金：工业和信息化部盾构/TBM关键核心零部件开发及应用项目。

摘　　要：以沉淀硬化钢20CrNi3Mn2Al为对象,对其进行有无Ti离子参与的离子渗氮处理(渗氮温度为540℃,渗氮时间为48 h,渗剂为热分解NH3),并对离子渗氮后的渗层硬度、有效渗氮层深度、摩擦磨损性能和腐蚀性能进行对比分析,研究了钛改性离子渗氮处理对沉淀硬化钢性能的影响。结果表明,较常规离子渗氮,Ti改性离子渗氮试样有效渗氮层深度提高约15%,硬度梯度较平缓;摩擦磨损后的划痕最大深度为8.894μm,腐蚀后的坑洞深度约9μm,较常规离子渗氮试样分别减小约45%和36%,耐磨性和耐蚀性显著提升。Plasma nitriding treatment for precipitation⁃hardened steel 20CrNi3Mn2Al was carried out with or without Ti(nitriding at 540℃for 48 h with the infiltration agent of thermal decomposition NH3).Then the hardness,effective nitrided layer depth,friction and wear performance,and corrosion performance of the nitrided layer after plasma nitriding were compared and analyzed,and the effect of Ti⁃modified plasma nitriding on properties of precipitation⁃hardened steel was studied.The results show that compared with conventional ion nitriding,the effective nitrided layer depth of Ti⁃modified ion nitriding specimen is increased by about 15%,and the hardness gradient is smoother.The maximum depth of scratches after friction and wear is 8.894μm,and the depth of pits after corrosion is about 9μm,which is reduced by about 45%and 36%compared to conventional plasma nitriding specimen,respectively.The wear resistance and corrosion resistance are significantly improved.

关 键 词：钛改性离子渗氮 沉淀硬化钢 渗氮层深 硬度 耐磨性 耐蚀性 

分 类 号：TG156.8[金属学及工艺—热处理]