研究了稀土元素加入后原位TiCp/Fe复合材料微观结构的变化。结果表明 ,稀土元素在Fe Ti C熔体中可形成细小的稀土复合化合物粒子 ,能促进TiC增强体的非均匀形核 ,并使组织中原位TiC颗粒的尺寸增加、数量减少 ;与此同时 ,添加稀土元素有效地改善了组织中Fe2 Ti相的分布 ,晶界上已无明显的Fe2 Ti相存在 ,有利于材料性能的改善 The microstructure of in-situ TiCp / Fe composites after addition of rare earth elements was investigated. The results show that rare earth elements can form fine rare earth composite particles in Fe Ti C melt, which can promote the heterogeneous nucleation of TiC reinforcements and increase the size of in situ TiC particles in the microstructure. At the same time, The addition of rare earth elements effectively improves the distribution of Fe2Ti phase in the microstructure, and no obvious Fe2Ti phase exists on the grain boundaries, which is beneficial to the improvement of material properties