甘油浓度对不锈钢表面液相等离子体电解渗透过程的影响

薛文斌^{1, 2}，金 乾^{1, 2}，刘 润^{1, 2}，金小越^{1, 2}，王 彬^{1, 2}，杜建成^{1, 2}

(1. 北京师范大学 核科学与技术学院 射线束技术与材料改性教育部重点实验室，北京 100875；
2. 北京市辐射中心，北京 100875)

摘 要：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(γ_C)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。

关键词：甘油；不锈钢；液相等离子体电解渗；渗碳

Influence of glycerin concentration on plasma electrolytic saturation process of stainless steel surface

XUE Wen-bin^{1, 2}, JIN Qian^{1, 2}, LIU Run^{1, 2}, JIN Xiao-yue^{1, 2}, WANG Bin^{1, 2}, DU Jian-cheng^{1, 2}

(1. Key Laboratory of Beam Technology and Materials Modification, Ministry of Education,
College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China;
2. Beijin)

Abstract: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 (γ_C) 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.

Key words:glycerin; stainless steel; plasma electrolytic saturation; carburizing