基于正交试验研究0Cr18Ni9Ti不锈钢等离子渗铪的最优工艺  

Optimal Process of 0Cr18Ni9Ti Stainless Steel with Plasma Surface Hafniuming Based on Orthogonal Experiment

作　　者：陆小会[1] 高原[1] 韦文竹[1] 张光耀[1] 王成磊[1] 

机构地区：[1]桂林电子科技大学材料学院,广西桂林541004

出　　处：《热加工工艺》2015年第6期101-104,共4页Hot Working Technology

基　　金：国家自然科学基金资助项目(51264007);国家自然科学基金青年基金资助项目(51201043);广西科学研究与技术开发科技攻关计划项目(桂科攻12118020-2-2-1);广西信息材料重点实验室项目(桂科能1210908-10-Z);桂林电子科技大学研究生教育创新计划资助项目(GDYCSZ201433)

摘　　要：采用L16正交实验,对0Cr18Ni9Ti奥氏体不锈钢双辉等离子渗铪行为进行研究,分析了影响渗铪合金层厚度的主次因素,取最主要因素进行单因素实验,并分析最优工艺下渗铪合金层的元素分布、物相结构以及硬度。结果表明：影响本试验的因素主次为温度〉时间〉电压〉气压〉极间距,优化的工艺参数为源极电压790~810 V,保温时间5 h,极间距25 mm,气压35 Pa,最主要因素温度的优化值为1100℃,此工艺下渗层厚度为35μm;表面组织晶粒细小、分布连续致密、无裂纹,由表及里铪元素含量呈梯度降低,硬度亦呈梯度降低,渗层表面硬度为600 HV0.1,比基材硬度提高约3倍,渗层物相主要为Hf2Fe、Hf C、Hf。The 0C r18Ni9 Ti austenitic stainless steel were modified with the Hf-layer by double glow plasma surface alloying technology.Hafniuming behaviour of 0Cr18Ni9 Ti austenitic stainless steel was studied by L16 orthogonal test,and the factors affecting the layer’s thickness were analyzed,then,the main single factor test was taken,and the element distribution,phase structure and hardness of the layer were analyzed.The results show that the primary and secondary factors are temperature〉 time〉 voltage〉 pressure〉 electrodes spacing; the optimization parameters of the process is source voltage 790V-810 V,holding time 5 h,electrodes spacing 20 mm,pressure 35 Pa,holding temperature 1100 ℃ which can form a Hf-layer with a thickness of 35 μm.The surface of Hf-layer has fine grain size,continuous dense distribution and no crack; the content of Hf and hardness decrease gradually from surface to interior.The surface hardness of the layer is 600 HV0.1,which increases 3 times than substrate,the new phase is Hf2 Fe,Hf C and Hf on the surface.

关 键 词：辉光等离子 奥氏体不锈钢 正交试验 渗铪合金层 

分 类 号：TG174.445[金属学及工艺—金属表面处理] TG115.5[金属学及工艺—金属学]