激光冲击能量对3D打印铝合金表面残余应力和形貌的影响  

Effect of Laser Shock Energy on Residual Stress and Surface Morphology of 3D Printed Aluminum Alloy

作　　者：窦世涛[1,2] 张津 郑林[1] 蔡明勇[3] 徐伟生 赵方超 计鹏飞[2] 陈新[1] DOU Shi-tao;ZHANG Jin;ZHENG Lin;CAI Ming-yong;XU Wei-sheng;ZHAO Fang-chao;JI Peng-fei;CHEN Xin(Southwest Institute of Technology and Engineering,Chongqing 400039,China;University of Science and Technology Beijing,Beijing 100083,China;Aviation Industry Chengdu Aircraft Industry(Group)Co.,Ltd.,Chengdu 610091,China)

机构地区：[1]西南技术工程研究所,重庆400039 [2]北京科技大学,北京100083 [3]航空工业成都飞机工业(集团)有限责任公司,成都610091

出　　处：《精密成形工程》2023年第6期55-61,共7页Journal of Netshape Forming Engineering

摘　　要：目的对不同激光冲击强化工艺条件下的3D打印铝合金样品的残余应力和表面形貌进行测试分析,评估不同激光冲击能量对3D打印铝合金表面残余应力和表面形貌的影响。方法利用X射线应力仪和白光干涉三维显微镜进行3D打印铝合金样品表面残余压应力和表面形貌的测试分析。结果当冲击能量为15 J时,3D打印铝合金样品表面残余应力最大为-89 MPa,当冲击能量为30 J时,3D打印铝合金样品表面残余应力最大为-129 MPa。激光冲击区域表面粗糙度由母材的约1.2μm增加至约3μm,搭接区域存在凸起。结论激光冲击能量增加,表面塑性变形增大。冲击能量为30 J的3D打印铝合金样品表面残余压应力约为冲击能量为15 J的1.5倍,提高冲击能量可有效提高表面压应力。The work aims to test and analyze the residual stress and surface morphology of 3D printed aluminum alloy samples under various laser shock peening procedures and evaluate the effect of various laser shock energy on the surface residual stress and morphology of 3D printed aluminum alloy.The residual compressive stress and surface morphology of 3D printed aluminum alloy samples were tested and analyzed by X-ray residual stress analyzer and white light interference 3D microscope.The maximum surface residual stresses of 3D printed aluminum alloy samples were-89 MPa under a shock energy of 15 J and-129 MPa under a shock energy of 30 J.The surface roughness of laser shock area increased from about 1.2μm to about 3μm in comparison to that of base material,and there were protrusions in the lap area.The amount of laser shock energy grows together with the surface plastic deformation.A 3D printed aluminum alloy sample under a shock energy of 30 J has a surface residual compressive stress that is around 1.5 times that of a sample under a shock energy of 15 J.The surface compressive stress can be successfully increased by increasing the shock energy.

关 键 词：3D打印 激光冲击强化 残余应力 表面形貌 无损检测 

分 类 号：TG146.21[一般工业技术—材料科学与工程]