研究了稀土对４５钢固体硼氮共渗工艺、渗层成分、组织、耐磨性及断口形貌的影响。试验结果表明，稀土的加入使渗速增大，渗层中Ｂ，Ｎ含量特别是Ｎ的含量增加，硼化物针齿变得细密、直长；且ＦｅＢ的相对含量减少，Ｆｅ２Ｂ相增加，渗层耐磨性提高，同时稀土增加了过渡区厚度，减少裂纹源。生产应用证明，稀土硼氮共渗可使烟机配件的使用寿命大幅提高。 The effects of rare earth on solid state boronitriding of 45 steel, composition, microstructure, wear resistance and fracture morphology of 45 steel were studied. The results show that the addition of rare earth increases the infiltration rate, and the content of B and N, especially N increases in the layer, the pin teeth of the boride become fine and straight and the relative content of FeB decreases and the amount of Fe2B phase increases Layer wear resistance increased, while rare earth increased the thickness of the transition zone, reducing the source of cracks. Production and application shows that rare earth boron nitride can make a substantial increase in the life of hood accessories.