采用光学显微镜、扫描电镜和力学性能检测设备等研究了RE复合变质处理对高铬合金铸铁显微组织和力学性能的影响。试验结果表明,变质处理可以细化基体组织,消除柱状树枝晶,改善碳化物形态和分布,使碳化物棱角得到钝化,碳化物更加细小,从而使高铬合金铸铁力学性能得到提高,与未变质高铬合金铸铁相比,变质高铬合金铸铁的硬度和冲击韧度分别提高了1.74%和27.27%,达到了HRC64.0和4.2 J/cm2。 The effects of RE composite modification on the microstructure and mechanical properties of high chromium alloy cast iron were studied by optical microscope, scanning electron microscopy and mechanical property testing equipment. The experimental results show that metamorphic treatment can refine the matrix structure, eliminate columnar dendrite, improve carbide morphology and distribution, carbide passivation, carbide is more small, so that high chromium alloy cast iron mechanical properties are improved, and not The hardness and impact toughness of metamorphic high-chromium alloy cast iron increased by 1.74% and 27.27%, respectively, reaching HRC 64.0 and 4.2 J / cm 2 compared with metamorphic high-chromium alloy cast iron.