Wang Qian, Ge Yaqiong, Chen Jingjia, Suzuki Tosei, Sagisaka Yoshihiro, Ma Ninshu
Joining and Welding Research Institute, Osaka University, Osaka 567-0047, Japan.
College of Materials Science and Engineering, Taiyuan University of Science and Technology, 66 Waliu Road, Taiyuan 030024, China.
Materials (Basel). 2024 Jul 14;17(14):3484. doi: 10.3390/ma17143484.
Laser shock peening (LSP) is a powerful technique for improving the fatigue performance of metallic components by customizing compressive residual stresses in the desired near-surface regions. In this study, the residual stress distribution characteristics of 6061-T6 aluminum alloy induced by LSP were identified by the X-ray diffraction method, and their dependent factors (i.e., LSP coverage, LSP energy, and scanning path) were evaluated quantitatively by numerical simulations, exploring the formation mechanism of LSP residual stresses and the key role factor of the distribution characteristics. The results show that LSP is capable of creating anisotropic compressive residual stresses on the specimen surface without visible deformation. Compressive residual stresses are positively correlated with LSP coverage. The greater the coverage, the higher the residual stress, but the longer the scanning time required. Raising LSP energy contributes to compressive residual stresses, but excessive energy may lead to a reduction in the surface compressive residual stress. More importantly, the anisotropy of residual stresses was thoroughly explored, identifying the scanning path as the key to causing the anisotropy. The present work provides scientific guidance for efficiently tailoring LSP-induced compressive residual stresses to improve component fatigue life.
激光冲击喷丸（LSP）是一种通过在所需近表面区域定制压缩残余应力来提高金属部件疲劳性能的强大技术。在本研究中，采用X射线衍射法确定了LSP诱导的6061-T6铝合金残余应力分布特征，并通过数值模拟定量评估了其相关因素（即LSP覆盖率、LSP能量和扫描路径），探索了LSP残余应力的形成机制及分布特征的关键作用因素。结果表明，LSP能够在试样表面产生各向异性的压缩残余应力，且无可见变形。压缩残余应力与LSP覆盖率呈正相关。覆盖率越大，残余应力越高，但所需扫描时间越长。提高LSP能量有助于产生压缩残余应力，但能量过高可能导致表面压缩残余应力降低。更重要的是，深入研究了残余应力的各向异性，确定扫描路径是导致各向异性的关键因素。本研究为有效定制LSP诱导的压缩残余应力以提高部件疲劳寿命提供了科学指导。
