丁红珍,李航,邱万奇

• 1:顺德职业技术学院智能制造学院
• 2:华南理工大学材料科学与工程学院

摘要(Abstract)：

以Al_2O_3为填充剂和活性炭为添加剂的改性粉末为渗硼剂，采用40CrNiMo钢为基体，在75 V/100 Hz交流电场作用下于630、650、700、750和850℃进行电场增强辅助固体渗硼。采用X射线衍射仪、扫描电镜和硬度计对渗硼后的样品进行显微分析及性能测试。结果表明：交流电场对渗硼过程有明显的促进作用，即便在较低的渗硼温度(750、700和650℃)下也可以在40CrNiMo钢试样的平面及棱角区域形成单一的Fe_2B相渗硼层；850℃时，渗硼层的棱角部位出现了少量的FeB相。温度过高(如850℃)及过高的电场辅助渗硼电流(如700℃渗硼时的2.38 A电流),会使渗硼层表面形成疏松表层，不利于致密渗硼层的形成；750℃渗硼4 h后的渗硼层具有最高的致密性和渗层硬度，其渗层厚度和表层区域硬度分别为120μm和1700 HV0.05。

关键词(KeyWords)： 40CrNiMo钢;粉末法渗硼;Fe_2B;棱角位渗硼;交流电场

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51971095)

作者(Author): 丁红珍,李航,邱万奇

DOI: 10.13289/j.issn.1009-6264.2023-0339

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