To select the optimal treatment mode of Ti64 alloy specimens with a stress concentrator, several laser shock peening (LSP) modes are studied. The effectiveness of the modes was determined by two criteria: indirect, based on the residual stress (RS) profile formed immediately after LSP (the depth of the layer with compressive RS and its maximum value), and direct, based on the number of cycles to failure during fatigue testing of Ti64 alloy flat specimens after hardening by LSP. The most effective LSP mode, which improves the fatigue properties of the specimens with the concentrator of the studied geometry, has been determined. To study the physical RS generation mechanisms, structural studies of the specimens after LSP have been carried out using the Electron Backscatter Diffraction (EBSD) method. The obtained data include the spread of the grain orientation, the average grain misorientation, and the change in the number of defects in the grains under different LSP modes. The results of the microstructure studies correlate with the profiles of the residual stresses caused by LSP.

为了选择采用应力集中器处理Ti64合金试样的最佳处理模式，对几种激光冲击喷丸（LSP）模式进行了研究。模式的有效性由两个标准确定：间接，基于 LSP 后立即形成的残余应力 (RS) 分布（具有压缩 RS 的层的深度及其最大值）；以及直接，基于循环次数LSP 硬化后的 Ti64 合金扁平试样在疲劳测试中失效。已经确定了最有效的 LSP 模式，该模式可以通过所研究的几何形状的集中器改善样本的疲劳性能。为了研究物理 RS​​ 产生机制，使用电子背散射衍射 (EBSD) 方法对 LSP 后的样本进行了结构研究。获得的数据包括不同LSP模式下晶粒取向的扩展、平均晶粒取向错误以及晶粒中缺陷数量的变化。微观结构研究的结果与 LSP 引起的残余应力的分布相关。