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采用阴极微弧碳氮共渗表面处理方法,在尿素+氯化钾水溶液体系下,研究了45钢表面碳氮共渗过程的放电特性。分析了处理后表面渗层的物相组成和显微组织形貌。结果表明,随电流增加,45钢的阴极微弧碳氮共渗过程可分成4个阶段,不同阶段对应不同的物理化学过程。其中,在辉光放电阶段产生的活性C、N粒子用于碳氮共渗。经微弧碳氮共渗处理后,碳氮共渗层表面呈多孔形貌,增大电源频率会增加粗糙度,提高占空比可使试样表面更平整。C元素和少量N元素渗入工件表面;共渗层主要由马氏体和少量铁碳化合物、铁氮化合物组成。
Cathode micro-arc carbonitriding surface treatment method was used to study the discharge characteristics of carbonitriding on 45 steel under urea + potassium chloride aqueous solution. The phase composition and microstructure of the treated surface layer were analyzed. The results show that with the increase of current, the cathodic microarc carbonitriding of 45 steel can be divided into four stages, different stages correspond to different physicochemical processes. Among them, the active C and N particles generated during the glow discharge are used for carbonitriding. After micro-arc carbonitriding treatment, the surface of the carbonitrided layer is porous, increasing the frequency of the power supply will increase the roughness, and increasing the duty ratio may make the surface of the sample more smooth. C element and a small amount of N elements infiltrated the surface of the workpiece; a total of infiltration layer mainly composed of martensite and a small amount of iron and carbon compounds, iron nitrogen compounds.