激光冲击对电火花修复SiC_p/Cu复合材料裂纹力学性能的影响  

Influence of laser shock processing on properties of SiC_p/Cu composite weld crack restored by electro-spark overlaying

作　　者：张洁[1] 祝乐[1] 孙爱华[1] 顾祥[1] 

机构地区：[1]江苏大学机械工程学院,江苏镇江212013

出　　处：《焊接学报》2009年第12期17-20,共4页Transactions of The China Welding Institution

基　　金：江苏省高技术研究计划资助项目(BG2007033);国家自然科学基金资助项目(50675089)

摘　　要：利用钕玻璃激光冲击强化设备对经电火花堆焊修复的SiCp/Cu复合材料裂纹进行了激光冲击强化处理,研究了激光冲击强化处理对电火花堆焊修复裂纹的影响.用X射线应力仪测定了沿垂直焊缝方向表面残余应力的分布状况,用微机控制电子万能试验机测量拉伸性能,用显微硬度计测试了焊缝表面的显微硬度.结果表明,当激光脉冲能量为35 J,激光光斑直径为5 mm时,激光冲击强化处理可以减小或消除焊缝表面残余拉应力,提高经电火花堆焊修复的SiCp/Cu复合材料裂纹试样的抗拉强度,还可以提高堆焊焊缝表面显微硬度.The crack of SiCp/Cu composite weld restored by electro-spark overlaying was processed by Nd: glass laser,and effects of laser shock processing on the electro-spark overlaying weld crack were analyzed.Surface welding residual stress distribution alone the transverse direction of the weld was investigated by X-ray diffraction techniques,the tensile strength of the weld was investigated by strength test,and the micro-hardness distribution of the weld surface was measured with a micro-hardness tester.The results show that when laser power is 35 J and laser spot diameter is 5 mm,the laser shock processing can reduce the welding residual stresses,which even change from the tensile stress into compressive stress,and improve the tensile strength and the hardness of SiCp/Cu composite weld restored by electro-spark overlaying.

关 键 词：激光冲击 电火花堆焊 残余应力 

分 类 号：TG407[金属学及工艺—焊接]