采用不同能量空间分布的激光对TC11钛合金进行了表面处理,通过X射线测试获得了试件经激光冲击后残余应力的分布规律。结果表明,在相同的工艺参数下,高斯分布激光处理的钛合金表面残余应力为-636.71 MPa,压应力影响层深度为1187 μm;平顶分布激光处理的分别为-559.20 MPa和811 μm。通过理论推算得到高斯分布激光产生的冲击波峰值压力是平顶分布的1.55倍。

The surface treatment of TC11 titanium alloys by lasers with different energy spatial distributions is conducted, and the residual stress in specimens induced by laser shock peening (LSP) is tested by X-ray diffraction. The results indicate that, under the same process parameters, the surface residual stress and the stress-affected layer depth in titanium alloys after LSP with a Gaussian distribution are -636.71 MPa and 1187 μm, respectively, while those with a flat-top distribution are -559.20 MPa and 811 μm, respectively. The theoretical calculation shows that the peak stress of shock waves induced by Gaussion spatial energy distributions is 1.55 times of that by flat-top spatial energy distributions.