激光功率和扫描线间距对扫描激光冲击成形的影响  

Influence of Laser Power and Scanning Path Spacing on the Height of Microstructure Formed by Scanning Laser Shock Forming

作　　者：李健[1] 范帆 赵肖肖 田子苇 徐伟[1] 余晓迪 LI Jian;FAN Fan;ZHAO Xiao-xiao;TIAN Zi-wei;XU Wei;YU Xiao-di(School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《光学与光电技术》2024年第1期29-34,45,共7页Optics & Optoelectronic Technology

基　　金：国家自然科学基金(51775248);江苏大学2022年大学生创新训练计划资助项目。

摘　　要：为探明扫描激光冲击成形工艺中激光功率和扫描线间距对成形微结构高度的影响规律,采用纳秒光纤激光在20μm厚的铝箔上实现直径为200μm的凸起阵列的激光冲击成形,并采用激光共聚焦显微镜测量微凸起的三维形貌。结果表明:在激光功率从10 W变化到18 W的过程中,成形微结构高度从17μm先增大至29μm再减小至12μm;扫描线间距从30μm变化到50μm的过程中,成形微结构高度从14μm逐渐增大到30μm。扫描激光冲击成形工艺中的这种激光功率和扫描线间距的影响,本质上是受到能量吸收层厚度的约束和激光烧蚀能量吸收层产生的冲击波强度的影响的共同结果,这种综合影响在多道次扫描激光冲击成形中需要得到重视。To investigate the influence of laser power and scanning path spacing on the height of microstructures formed by the scanning laser shock forming process,this paper employs nanosecond fiber laser to form micro protrusions array with diameter of 200μm on aluminum foil with thickness of 20μm by Laser shock forming.The three-dimensional morphology of micro protrusionsis measured by using a laser confocal microscope.The results indicate that during the process of laser power changing from 10 W to 18 W,the height of the formed microstructure increases from 17μm first to 29μm and then decreases to 12μm.When the scanning line spacing changes from 30μm to 50μm,the height of the formed microstructure increases gradually from 14μm to 30μm.The influence of laser power and scanning line spacing in the scanning laser shock forming process is essentially the common result of the constraint of the energy absorption layerthickness and the influence of the strength of the shock wave generated by laser ablation of the energy absorption layer.This comprehensive influence needs to be paid attention to in the multi pass scanning laser shock forming.

关 键 词：激光冲击成形 扫描冲击 小光斑 激光功率 扫描线间距 

分 类 号：TN249[电子电信—物理电子学]