激光冲击表面强化对焊接接头力学性能的影响  

The Effect of Laser Shock Surface Processing on Mechanical Properties of Welded Joints

作　　者：周磊[1,2] 汪诚[1] 周留成[1] 陈科庆[2] 

机构地区：[1]空军工程大学工程学院 [2]中国人民解放军94534部队

出　　处：《中国表面工程》2010年第5期41-44,48,共5页China Surface Engineering

基　　金：国防预研基金(5132701)资助项目

摘　　要：为提高焊接接头的力学性能,利用波长为532nm,脉宽为10ns,能量为6.25J,光斑尺寸为3mm的YAG激光器对焊接接头进行了激光冲击强化处理。结果表明:激光冲击强化使接头拉伸强度由815MPa提高到867MPa,焊缝硬度提高51.4%,热影响区硬度提高28.2%,焊接后残余应力由134MPa转变为-237MPa。利用光学显微镜对焊缝进行了观察和分析,并对力学性能提高的机制进行了讨论。In order to improve mechanical properties of welded joints,these joints specimens were processed by YAG laser with parameters of 532 nm-wavelength,10 ns-pulse duration,and 6.25 J output energy,Φ 3mm.The results show that the tensile strength of welded joints after laser shock processing is effectively enhanced from 815 to 867 MPa,the welded line hardness has been improved by 51.4 %,the HAZ hardness has been improved by 51.4 % and the residual stress has been changed from 134 MPa to-237 MPa,The fractographs ...

关 键 词：激光冲击强化 焊接接头 抗拉强度 疲劳寿命 

分 类 号：TG407[金属学及工艺—焊接]