激光冲击次数对TA15微观组织和硬度的影响  

Influence of laser shock peening times on microstructure and hardness of TA15 titanium alloy

作　　者：朱颖[1] 范博文[1] 郭伟[1] 康慧[1] 

机构地区：[1]北京航空航天大学机械工程及自动化学院,北京100191

出　　处：《北京航空航天大学学报》2014年第4期444-448,共5页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家国际科技合作项目(S2013HR0027L)

摘　　要：采用脉冲能量20 J的调Q掺钕玻璃激光对钛合金TA15进行不同次数的激光冲击强化.结果表明,激光冲击强化使材料表面产生微塑性变形,形成致密的微凹坑,导致晶粒细化,并且随冲击次数的增加,其微凹坑的深度增加;但当冲击次数超过2次后,深度便不再增加.所以试验中的最高冲击次数为2次,而且在冲击次数为2次以内,材料位错密度也随冲击次数的增加而增加,并发生塞积、增殖、缠结等现象.表征在硬度方面,由于上述微观组织的变化,材料的硬度提高.随着冲击次数增加,材料的硬度增加并且激光冲击强化的影响层深度也随之增加.Q-switched Nd glass laser with 20 J energy was used to shock TA15 titanium alloy in differenttimes. Results show that laser shock peening （LSP） can produce micro plastic deformation, form dense micropits and refine the grain size. When the number of impact times increases, the depth of the micro pits increa-ses, but after the impact times is more than twice, the depth of the pits will stop increasing, so the highest im-pact times is twice in this experiment. Under the impact times of twice, the dislocation density is increasingwith the increase of impact times. In the process, the dislocation will pile up, snarl, and proliferate. Thehardness of the material increases because of the variation of microstructure above. The surface hardness andthe depth of affected layers increase due to the increase of the shock times.

关 键 词：激光冲击强化 钛合金TA15 微观组织 硬度 

分 类 号：TN249[电子电信—物理电子学]