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本文以WC-Co硬质合金为渗硼研究对象,研究开发出一种感应加热密闭容器气-固渗硼工艺方法 ,借助于金相显微镜对渗硼层厚度实现了直接观察,应用SEM、EDS能谱、XRD、场发射电镜等对合金的组织进行了分析。实验结果表明:渗硼层厚度可达0.1～0.5 mm,渗硼层Co粘结相中弥散分布羽毛状W-C-Co-B析出相;感应加热、密闭容器中气相的作用和渗硼剂中的稀土促进了渗硼过程的进行;硬质合金Co含量、渗硼温度、渗硼时间增加有利于渗硼层厚度增加;应用数据拟合得到了YG11合金渗硼层厚度与渗硼温度、渗硼时间关系表达式。
In this paper, WC-Co cemented carbide as the object of boronization research, developed a gas-tight induction induction heating vessel gas - solid boronization process, with the help of metallographic microscope on boronized layer thickness to achieve a direct observation, the application of SEM, EDS X - ray diffraction (XRD) and field emission electron microscopy (TEM) were used to analyze the microstructure of the alloy. The experimental results show that the thickness of the boronizing layer can reach 0.1-0.5 mm, and the feathery WC-Co-B precipitates dispersedly disperse in the coherent layer of the boronizing layer. The effect of induction heating, the gas phase in the closed vessel and the boronizing agent Rare earths promoted the process of boronizing; Ce content, boronizing temperature and boronizing time increased the thickness of boronizing layer; the thickness of boronizing layer and boronizing temperature of YG11 alloy were obtained by fitting data, Time relationship expression.