工艺参数对Q235钢辉光等离子渗Cr渗层影响的研究

Effects of Process Parameters on Layer of Plasma Chromizing on Q235 Steel

在不同电源、不同气压、不同温度工艺参数下对Q235钢表面进行辉光等离子渗Cr。用金相显微镜及扫描电镜观察渗层组织形貌,用能谱仪进行渗层Cr元素浓度分布测定,用X衍射仪进行物相分析。结果表明:不同电源渗Cr的渗层均出现反应扩散现象,渗层均为明显的柱状晶组织;脉冲电源渗Cr层厚度最大达到100μm以上,表面Cr含量达到40%(w%)左右,渗层距表面10μm处Cr含量达到10%以上,渗Cr层成分分布明显好于直流电源和双辉双电源;脉冲电源渗Cr随气压的升高,渗层厚度及Cr含量先增大后减小,工艺条件下最佳气压值为30Pa;脉冲电源渗Cr随着温度的升高Cr渗层厚度增加,渗层Cr浓度分布曲线随温度的升高由表面向内梯度变得平缓且浓度提高。

Q235 steel was chromized by using glow plasma surface alloying technique under different powers, gas pressures and temperatures of the process parameters. Use metallographic microscope and scanning electron microscopy to observe morphology of the layer. Use EDS to determinate the concentration of Cr distribution in the layer, and use X diffractometer to get the phase analysis. The results show that all the layers of chromizing appear reaction-diffusion phenomena under different powers, there are clear colum...