多次激光冲击强化对ЭП866马氏体不锈钢组织及残余应力的影响  

Effect of Multiple-Laser Shock Processing on Microstructure and Residual Stress ofЭП866 Martensitic Stainless Steel

作　　者：张青来[1] 赵博[1] 张冰昕 李兴成[3] 刘惠[1] Zhang Qinglai Zhao Bo Zhang Bingxin Li Xingcheng Liu Hui(School of Materials Science and Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai 200240, China School of Mechanical Engineering, Jiangsu University of Technology, Changzhou, Jiangsu 213000, China)

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]上海交通大学密西根学院,上海200240 [3]江苏理工学院机械工程学院,江苏常州213000

出　　处：《中国激光》2016年第11期121-128,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金(51175231)

摘　　要：采用钕玻璃脉冲激光器进行了航空发动机用З∏866耐热马氏体不锈钢激光冲击强化实验研究。结果表明，不锈钢组织由马氏体板条和析出碳化物组成，多次冲击表层产生高密度位错缠结，回火后仍保留其缠结结构，产生大量的纳米析出相。多次冲击可使表层引入更高幅值的残余压应力，幅值达-715．4MPa，且残余压应力值随光斑搭接次数增加而增加。500-650℃回火处理后残余压应力下降幅度达到50％，具有良好的热稳定性，冲击次数对其影响较小。Laser shock processing tests of З∏866 heat-resistant martensitic stainless steel for aero-engine were carried out with a Nd glass laser. The results show that the microstructure of stainless steel is composed of martensite laths and carbide precipitation. High density dislocation entanglement occurs in the surface layer during multi-impacts. After tempering treatment, the tangled microstructures still exist and more nano-sized precipitation occurs. Higher-amplitude compressive residual stress is produced in the surface layer by multi-impacts, whose amplitude can be reached to - 715.4 MPa, and residual compressive stress increases with the increase of the lap times. After tempering treatment at the temperature from 500 ℃ to 650 ℃, the residual compressive stress decreases by 50%, which shows good thermal stability and weak effect of the impact times.

关 键 词：激光技术 З∏866不锈钢 激光冲击强化 残余压应力 热处理 微观结构 

分 类 号：TN249[电子电信—物理电子学]