316L不锈钢离子渗氮/PVD复合改性层的组织与性能  

Microstructure and properties of ion nitriding/PVD composite modified layer on 316L stainless steel

作　　者：曹驰[1,2] 张翔[1] 陈志林 陈东升 张琢 Cao Chi;Zhang Xiang;Chen Zhilin;Chen Dongsheng;Zhang Zhuo(School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou Gansu 730050,China;Wenzhou Research Institute of Pump and Valve,Lanzhou University of Technology,Wenzhou Zhejiang 325105,China)

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050 [2]兰州理工大学温州泵阀工程研究院,浙江温州325105

出　　处：《金属热处理》2025年第1期299-307,共9页Heat Treatment of Metals

基　　金：甘肃省科技计划项目(20YF8GA058);温州市工业科技项目(ZG20211003)。

摘　　要：为了提高不锈钢表面硬度、耐磨性和耐蚀性能,研究了单一离子渗氮和离子渗氮/物理气相沉积(PVD)复合处理工艺对316L奥氏体不锈钢组织、硬度、摩擦磨损及耐蚀性能的影响。结果表明,经单一离子渗氮处理的试样表面形成厚度约20μm、硬度约802 HV0.05的高氮硬化层;经渗氮/PVD复合处理的试样表面形成厚度约25μm、纳米硬度约29 GPa的改性层;两种工艺均形成了γ_(N)相,渗氮/PVD复合处理的试样表面形成的非晶薄膜未对中间层物相造成影响。与基体相比,单一渗氮试样在干摩擦和腐蚀摩擦工况下的摩擦因数分别降低至0.520和0.311;经渗氮/PVD复合处理试样则降低至0.074和0.119;单一渗氮试样和渗氮/PVD复合处理试样自腐蚀电流密度由4.602䦆Wingdings 2NC@10^(-8) A/cm^(2)分别降低至4.084䦆Wingdings 2NC@10^(-8) A/cm^(2)和3.318䦆Wingdings 2NC@10^(-8) A/cm^(2),自腐蚀电位由-0.213 V分别升高至-0.195 V和-0.182 V。综合比较,渗氮/PVD复合处理可以显著提高316L奥氏体不锈钢的表面硬度、耐磨性及耐蚀性。To improve the surface hardness,wear resistance,and corrosion resistance of stainless steel,the effects of single ion nitriding and ion nitriding/physical vapor deposition(PVD) composite treatments on the microstructure,hardness and tribological and corrosion properties of 316L austenitic stainless steel were studied.The results show that the specimen treated by single ion nitriding forms a high-nitrogen hardened layer with a thickness of about 20 μm and hardness of about 802 HV0.05.The specimen treated by nitriding/PVD composite treatment forms a modified layer with a thickness of about 25 μm and nanohardness of about 29 GPa.Both processes form the γ_(N) phase,and the amorphous film formed on the surface of the nitriding/PVD composite treated specimen does not affect the phase of the intermediate layer.Compared to that of the substrate steel,the friction coefficients of the single nitrided specimen decrease to 0.520 and 0.311 under dry friction and corrosive friction conditions,respectively,while that of the nitriding/PVD composite treated specimen decrease to 0.074 and 0.119,respectively.The self-corrosion current density of the single nitrided and the nitriding/PVD composite treated specimens decrease from 4.602×10^(-8) A/cm~2 to 4.084×10^(-8) A/cm~2 and 3.318×10^(-8) A/cm~2,respectively,and the self-corrosion potentials increase from-0.213 V to-0.195 V and-0.182 V,respectively.Comprehensively,the composite treatment can significantly improve the surface hardness,wear resistance,and corrosion resistance of the 316L austenitic stainless steel.

关 键 词：316L不锈钢 离子渗氮 物理气相沉积 组织 硬度 耐磨性 耐蚀性 

分 类 号：TG156.8[金属学及工艺—热处理]