为提高38CrMoAl钢渗氮层质量和耐磨性能,提出了激光冲击处理增强渗氮的组合方法。利用球磨实验分析了不同激光冲击次数下渗氮的耐磨性能,采用SEM和XRD研究了激光不同冲击次数对38CrMoAl渗氮的微观组织和相成分的影响。结果表明随着冲击次数的增加,试样的比磨损率先降低后增加。从微观组织和相分析两个方面讨论了冲击次数对渗氮耐磨性能的影响机理激光冲击强化可促进渗氮的过程。在没有新相形成的条件下,随着激光冲击次数的增加,试样的表层形成的氮化物颗粒增大、数量增多,固溶强化和第二相强化作用增强,从而提高其耐磨性能。但当冲击次数继续增加,大量的氮化物沿晶界成网状分布时,就会降低38CrMoAl钢的耐磨性能。 In order to improve the quality and wear resistance of nitrided layer of 38CrMoAl steel, a combination of laser shock treatment and enhanced nitriding was proposed. The wear resistance of nitriding under different laser impact times was analyzed by ball milling experiment. The effects of different laser shock times on microstructure and phase composition of nitrided 38CrMoAl were studied by SEM and XRD. The results show that with the increase of the number of impact, the specific wear rate of the sample first decreases and then increases. The influences of impact times on the wear resistance of nitriding are discussed from two aspects of microstructure and phase analysis. The mechanism of laser shock strengthening can promote nitriding. Under the condition of no new phase formation, with the increase of the number of laser shocks, the nitride particles formed on the surface of the sample increase, the number increases, and the solid solution strengthening and the strengthening effect of the second phase are enhanced to improve the wear resistance. However, when the impact number continues to increase, a large number of nitride along the grain boundary distribution, it will reduce the 38CrMoAl steel wear resistance.