【摘要】 本文探讨了20、45、T8、T12钢经950℃×4h涂料硼锆共渗层的组织和相结构。光学金相显微镜、X射线衍射仪和扫描电子显微镜分析结果表明,共渗层主要由（Fe、Zr）B,（Fe、Zr）₃（C、B）相组成,还有Zr₂Fe,Zr₄Fe等化合物。与单元渗硼相似,共渗层具有梳齿状特征。表面疏松区有所减少。疏松区内有Fe、Zr、Si、Al等元素。共渗层与渗硼层比较具有较好的耐蚀性、高温抗氧化性、耐磨性和较低的脆性。因此,硼锆共渗是一种值得推广的新型化学热处理工艺。更多还原

【Abstract】 This paper deals with the microstructure and phase composifion of the Boron-Zirconizing layer by pasty medium on 20, 45, T8, T12 steel at 950℃ for 4 hours The analysis made by the microscope, X-ray diffraction and SEM showed that, the diff usion layer was composed mainly of （Fe. Zr） B, （Fe. Zr）₃ （C. B）. Besides Zr₂Fe. Zr₄Fe and some other compounds were found there. Compared with the single boronizing diffusion layer, the Boron-Zirconizing layer possesses a comb-like feature with the porosity area of the surface reduced. The porosity area contains Fe, Zr, St, Al and some other elements. In comparison with the single boronizng layer, the Boron-Zirconizing diffusion layer has a relatively high resistance to corrosion, wear and oxidation at high temperature as well as a lower brittleness. Therefore, the Boron-Zirconizing is a widespreaded, novel thermo-chemical treatment process.更多还原