Abstract A metal material surface marking method was developed based on the theory that a larger thickness of the absorption layer can attenuate a laser-induced shock wave. The introduction of surface residual compressive stress is the main feature of this new marking method, which is different from the traditional mechanical processing marking method and is also the key factor leading to the good service performance of the metal material surface. After the laser shock marking (LSM) treatment, the residual stress at different positions on the metal surface was measured, and the change in distribution trend of residual stress and microstructure in the laser shock-treated region was discussed. The results show that for two different marking patterns, the expected deformation areas have a remarkable residual compressive stress distribution, and the relatively large full width at half maximum (FWHM) of the X-ray diffraction peak of the expected deformation areas characterizes significant microstructure changes. The microstructure of the edge region of the formed mark shows a sudden change, while the residual stress changes gradually. This change indicates that the surface's severe plastic deformation is directly related to microstructure changes and indirectly related to residual stress changes.

中文翻译：

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激光冲击打标后金属表面残余应力的分布规律

摘要 基于较大厚度的吸收层可以衰减激光激波的理论，提出了一种金属材料表面打标方法。引入表面残余压应力是这种新型打标方法的主要特点，区别于传统的机械加工打标方法，也是导致金属材料表面良好使用性能的关键因素。激光冲击标记（LSM）处理后，测量金属表面不同位置的残余应力，讨论激光冲击处理区域残余应力和微观结构的分布趋势变化。结果表明，对于两种不同的标记图案，预期变形区域具有显着的残余压应力分布，并且预期变形区域的 X 射线衍射峰的相对较大的半峰全宽 (FWHM) 表征显着的微观结构变化。形成的标记边缘区域的微观结构呈现出突变，而残余应力逐渐变化。这种变化表明表面的剧烈塑性变形与微观结构变化直接相关，与残余应力变化间接相关。