2Cr13不锈钢的稀土催渗循环离子渗氮工艺研究  

Research on cyclic ion nitriding technology catalyzed by rare earth for 2Cr13 stainless steel

作　　者：吴凯[1] 刘国权[1] 王蕾[2] 许伯藩[2] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]武汉科技大学材料与冶金学院,湖北武汉430081

出　　处：《材料热处理学报》2008年第2期131-134,139,共5页Transactions of Materials and Heat Treatment

基　　金：武汉科技大学与武汉等离子体研究所合作项目(20056160273)

摘　　要：对2Cr13不锈钢进行稀土催渗循环离子渗氮试验,并和常规离子渗氮进行对比研究。利用光学显微镜、显微硬度计、XRD、磨损机、扫描电镜及能谱仪对渗氮层进行分析。结果表明:稀土催渗循环离子渗氮工艺不仅能加快渗氮速度,提高耐磨性;而且可以使渗氮层的表面硬度提高、显微硬度梯度变得平缓,同时渗氮效果随循环次数增加而愈好。另外,还能优化2Cr13不锈钢渗氮层的相组成。扫描电镜结合能谱分析得知:添加到渗氮气氛中的纯稀土La存在于渗层中,既验证La的催渗效果,又说明La起到一定的微合金化作用。The cyclic ion nitriding test catalyzed by rare earth for 2Cr13 stainless steel was carried out and compared with conventional ion nitriding process.The nitriding layers were investigated by means of optical microscope,microhardness test,X-ray diffraction,wear test,SEM and EDS.The results show that ion nitriding by thermal cycling and catalyzed by rare earth can not only increase the nitriding speed,improve the wear resistance of the nitrided steel,but also enhance the surface hardness of the nitriding layer,smooth the gradient of microhardness. The nitriding effectiveness improves with increasing the number of the ion nitriding cyclings.In addition,it is found that the optimum microstructure of nitriding layer with more γ′ phase and less ε phase is obtained by cyclic ion nitriding and rare earth catalyzing for 2Cr13 stainless steel.The observation of SEM combining with EDS analysis indicates existence of the pure rare earth La in the nitriding layer,which was added into the nitriding atmosphere.The addition of rare earth accelarates the nitriding process and plays a role of microalloying.

关 键 词：不锈钢 耐磨性 稀土催渗 离子渗氮 化学热处理 

分 类 号：TG156.82[金属学及工艺—热处理]