本文在通氨滴醇软氮化基础上加入不同量的稀土元素,研究了稀土元素对QT70—2球铁软氮化动力学、渗层组织及硬度的影响。结果表明,稀土元素(La)对软氮化过程具有显著的催渗作用,使渗层表面硬度及渗层硬度增加,渗层深度增加。加15克稀土软氮化可使软氮化渗速提高55%。同时,本文对稀土的渗入及催渗机理进行了研究。 In this paper, different amounts of rare earth elements were added on the basis of nitrocarburizing with ammonia dropping agent. The effects of rare earth elements on the nitriding kinetics, microstructure and hardness of QT70-2 iron were studied. The results show that rare earth elements (La) have a significant catalytic effect on nitrocarburizing, which increases the surface hardness and the hardness of the diffusion layer and the depth of the diffusion layer. Adding 15 grams of rare earth soft nitriding can increase the soft nitriding rate by 55%. In the meantime, the infiltration and mechanism of rare earth are studied in this paper.