以50%~90%(体积分数)甘油水溶液为电解液,研究304不锈钢表面液相等离子体电解快速渗碳工艺;分析不同甘油浓度和电压下渗碳层的显微组织、相组成和显微硬度.结果表明,随甘油浓度的提高,渗透电压上升,渗碳层厚度增加,渗碳层硬度增大,最大硬度达到762HV;且渗碳层中固溶碳的奥氏体(γC)含量急剧增加,但碳化物含量降低.在80%(体积分数)甘油水溶液和电压350 V工艺条件下获得的渗碳层质量较好.
@@@@The rapid carburizing process of plasma electrolytic saturation in 50%?90% (volume fraction) glycerin aqueous solution on 304 stainless steel surface was investigated. The microstructure, phase component and microhardness of carburizing layers at different glycerin concentrations and voltages were analyzed. The results show that by increasing the glycerin concentration, the saturation voltage is improved, meanwhile the thickness and microhardness of carburizing layer are increased, and the maximum microhardness is up to 762HV. In addition, the expanded austenite (γC) content in the carburizing layer increases greatly with the increase of glycerin concentration, but the carbide content reduces correspondingly. It is found that the carburizing layer obtained at 350 V and 80% glycerin (volume fraction) has better property.
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