激光冲击强化对钛合金疲劳寿命影响综述  

Laser Shock Processing and Its Effect on Fatigue Life of Titanium Alloys:A Review

作　　者：钱丽艳 王艳虎 戴峰泽[3] KONOVALOV Sergey 闻明[4] 陈希章[1] QIAN Liyan;WANG Yanhu;DAI Fengze;KONOVALOV Sergey;WEN Ming;CHEN Xizhang(School of Electromechanical Engineering,Wenzhou University,Wenzhou 325035,China;Department of Metals Technology and Aviation Materials,Samara National Research University,Samara 443086,Russia;School of Electromechanical Engineering,Jiangsu University,Zhenjiang 212013,China;State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals,Kunming Institute of Precious Metals,Kunming 650106,China)

机构地区：[1]温州大学机电工程学院,温州325035 [2]萨马拉国立研究型大学金属技术与航空材料系,萨马拉443086俄罗斯 [3]江苏大学机电工程学院,镇江212013 [4]昆明贵金属研究所稀贵金属综合利用新技术国家重点实验室,昆明650106

出　　处：《中国表面工程》2022年第2期103-112,共10页China Surface Engineering

基　　金：浙江省重点研发计划资助项目(2021C04022)。

摘　　要：对提升钛合金零件的疲劳强度,已有相关技术的试验研究,但缺乏对技术的系统介绍,阻碍了该技术的产业化应用。通过整理大量试验数据及其结果,就激光冲击强化对钛合金零件的疲劳特性的影响展开分析。简要介绍激光冲击强化技术的发展状况,分别从表面形貌、残余应力、微观组织、硬度、表面粗糙度等方面进行分析总结。结果发现,当激光脉冲能量为7 J时,材料塑性变形量最大;当激光功率密度为3 GW/cm^(2),材料表面残余压应力值最高;当冲击次数达到5次以上时,材料表层的位错密度不断增大;当在工件表面覆盖一层高强度的光滑金属接触膜时,材料表面粗糙度将降低。综合数据可知激光功率密度及冲击次数对钛合金疲劳寿命的影响最大。整理了大量试验数据,可为得到最佳的激光冲击强化效果及提升疲劳寿命提供理论参考。In order to promote the fatigue strength of titanium alloy parts,scholars have carried out experimental research on the related technology,but the lack of systematic introduction of this technology hinders the industrial application of it.A lot of experimental data and results are collected,and the effect of laser shock peening on fatigue properties of titanium alloy parts is analyzed.The development of laser shock strengthening technology is introduced,and the surface morphology,residual stress,microstructure,hardness and surface roughness are analyzed and summarized respectively.The results show that when the laser pulse energy is 7 J,the plastic deformation of the material reaches the maximum.When the laser power density is 3 GW/cm^(2),the residual compressive stress is the highest.When the impact number reaches more than 5 times,the dislocation density of the material surface increases continuously.When the workpiece surface is covered with a high strength smooth metal contact film,the surface roughness of the material will be reduced.Comprehensive data show that laser power density and impact times have the greatest influence on fatigue life of titanium alloy.A large number of experimental data are sorted out,which provides an important theoretical reference for obtaining the best laser shock strengthening effect and improving fatigue life.

关 键 词：激光冲击 钛合金 疲劳强度 表面形貌 残余应力 力学性能 

分 类 号：TG156[金属学及工艺—热处理] TB114[金属学及工艺—金属学]