等离子体源离子渗氮 1Cr18Ni9Ti 奥氏体不锈钢磨损特性的试验研究  

Wear Characteristics of Plasma Source Ion Nitrided 1Cr18Ni9Ti Austenitic Stainless Steel

作　　者：雷明凯[1] 李有宏[1] 张仲麟[1] 黄岩[2] 

机构地区：[1]大连理工大学三束材料改性国家重点联合实验室 [2]大连海事大学金属工艺研究所

出　　处：《摩擦学学报》1997年第3期206-213,共8页Tribology

摘　　要：用等离子体源离子渗氮，即低能（１～３ｋｅＶ）、超大剂量（１０１９～１０２０ｉｏｎｓ／ｃｍ２量级）Ｎ＋注入－同步扩散改性技术，在２８０℃和３８０℃下处理１Ｃｒ１８Ｎｉ９Ｔｉ奥氏体不锈钢，获得了最大深度分别为１．６μｍ和１０．６μｍ，固溶Ｎ的最高原子浓度均约为２５％的Ｎ过饱和面心立方相（γＮ）改性层．销－盘磨损试验表明：在２ｍ／ｓ和较宽负荷范围（等效正应力０．２～２．８ＭＰａ）条件下，高硬度（ＨＫ０．１Ｎ２２００）的γＮ相改性层具有较高的承载能力和较长的耐磨寿命．高度过饱和Ｎ在母相奥氏体中的固溶强化作用，是使等离子体源离子渗氮奥氏体不锈钢耐磨性提高的主要原因．Plasma source ion nitriding, that is, nitrogen ion implantation at low energy(1-3 keV) and superhigh dose (1019-1020 ions/cm2) combined with implanted nitrogen diffusion into metal and alloy, has been used to modify 1Cr18Ni9Ti austenitic stainless steel. The nitrided layers consisted of nitrogen oversaturated austenite (γN) phase with a high nitrogen atom concentration (about 25%) and a thickness of 1.6　μm and 10.6 μm were obtained at a process temperature of 280　℃ and 380　℃, respectively. The effect of plasma source ion nitri ding on the wear characteristics of the stainless steel has been investigated by using a conventional pinondisc machine in which the experimental samples slid under a nominal pressure from 0.2 to 2.8 MPa, a velocity of 2 m/s, and a test duration of 3 000 min and 9　000 min. It was demonstrated that plasma source ion nitriding remarkably improves the wear resistance of the stainless steel. The nitrogen solid solution strengthening of　γN phase contributed mainly to the improvement of wear resistance of the nitrided stainless steel.

关 键 词：等离子体源 离子渗氮 奥氏体不锈钢 耐磨性 

分 类 号：TG142.71[一般工业技术—材料科学与工程] TG161.8[金属学及工艺—金属材料]