作　　者： ; ; ; ; ; ;

机构地区： 空军工程大学

出　　处： 《强激光与粒子束》 2014年第5期302-307,共6页

摘　　要： 为了提高12CrNi3A钢渗碳层质量及其抗磨损性能,提出了激光冲击与渗碳不同顺序复合的工艺方法。球磨实验结果表明,相比渗碳处理,激光冲击后渗碳试样的比磨损率降低了51%,而渗碳后激光冲击强化试样的比磨损率降低了13%,说明激光冲击后渗碳的复合工艺能更好地改善抗磨损性能。在摩擦系数差别不大的情况下,抗磨损性能的提升与显微硬度提高、微观组织变化有关,从这两方面讨论抗磨损性能提升的机理。研究表明:激光冲击强化可促进渗碳的过程,强化后渗碳形成的渗碳层结构致密,大量细小碳化物形成,固溶强化、第二相强化作用增强,显微硬度增大,从而提高抗磨损性能;而渗碳后激光冲击强化只使渗层表面发生了形变强化,与渗碳工艺相比,显微硬度略有提高,抗磨损性能提高有限。 To improve the carburized layer quality and wear performance of 12CrNi3A steel, a composite technology of laser shock processing and carburization was put forward. The results of ball milling experiment showed that the specific wear rate of specimen treated by carburization after laser shock processing reduced by 51% compared with that treated by carburization only, and was reduced by 13% compared with that treated by laser shock processing after carburization. It shows that the composite technology of carburization after laser shock processing can improve the wear resistance of 12CrNi3A steel effectively. The cause of the improvement of wear resistance is the increasing of micro-hardness and the diversification of the microscopic structure, when the coefficient of friction is in a invariant state. The mechanism of wear resistance improvement was analyzed using micro- hardness and scanning electron microscope （SEM）. The results indicate that the laser shock processing can promote the process of carburization. The structure of carburized layer is compact and a large number of fine carbide particles are formed in the surface treated by carburization after laser shock processing, which leads to the increasing of the second phase strengthening and solution strengthening in the carburized layer, and the micro-hardness and wear resistance are improved. But the laser shock processing af- ter carburization only affects the surface deformation, and the improvement of micro-hardness and wear resistance is limited com- pared with carburization.

关 键 词： 激光冲击强化 渗碳 复合工艺 钢 抗磨损性能

领　　域： [金属学及工艺] [金属学及工艺]