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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 L16 orthogonal experiment was used to study the dual-hull plasma hafnium formation of 0Cr18Ni9Ti austenitic stainless steel. The primary and secondary factors influencing the thickness of the hafnium alloy were analyzed. The single factor experiment was the most important factor and the optimal technology was analyzed Hf alloy layer elemental distribution, phase structure and hardness. The results showed that the main factors influencing the test were temperature> time> voltage> air pressure> electrode spacing. The optimized process parameters were source voltage 790 ~ 810 V, holding time 5 h, electrode spacing 25 mm and pressure 35 Pa The main factor is the optimal temperature of 1100 ℃, the infiltration layer thickness of this process is 35μm; surface grain structure is small, continuous and dense distribution, no cracks, from the table and the content of hafnium gradient decreased, the hardness also showed a gradient decline, seepage The surface hardness of the layer is 600 HV0.1, which is about 3 times higher than that of the substrate. The main phase of the layer is Hf2Fe, Hf C, Hf.