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中文摘要：
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。
英文摘要：
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.
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