研究了 9Si Cr钢稀土硼钒共渗层组织和性能及其在模具中的应用。实验结果表明 ,稀土的加入对硼钒共渗具有一定的催渗作用 ,使渗层增厚。稀土硼钒共渗可抑制 Fe B相的形成 ,共渗层 Fe2 B相呈细针状楔入基体 ,VC呈粒状弥散分布在 Fe2 B齿间和 Fe2 B与基体的过渡层中 ,组织均匀、致密 ,渗层耐磨性和耐蚀性较稀土硼共渗有所提高 ,渗层脆性有所降低。采用该工艺处理的钢管挤压内模使用寿命较长 The microstructure and properties of rare earth boro-vanadium co-diffusion layer in 9Si Cr steel and its application in molds were studied. The experimental results show that the addition of rare earth has a certain catalytic effect on boron vanadium co-permeation, which makes the diffusion layer thicker. Rare earth boron vanadium co-infiltration can inhibit the formation of Fe B phase, the co-infiltrated Fe2 B phase fine wedge into the matrix, VC was granular dispersed in the Fe2 B interdental and Fe2 B and the substrate transition layer, uniform organization, Densification, wear resistance and corrosion resistance than the rare earth boron co-infiltration has increased, the brittleness of the layer decreased. The steel tube extrusion process using this process has a longer service life