激光增材制造具有快速、柔性和绿色制造等技术优势, 但增材制造过程中高的温度梯度变化和不均匀相变所致的拉应力, 易导致零件的变形和力学性能不足。本文针对激光增材GH1131高温合金薄壁件进行激光冲击强化处理, 以激光能量、冲击次数为变化量, 分析了激光冲击强化前后薄壁试样件的表面变形、表面粗糙度、表面残余应力、表面硬度。结果表明, 激光冲击强化后, 相对于激光冲击强化方向, 薄壁件呈现凸面变形, 并且变形量、表面粗糙度增加, 分别增加了48.87 μm、0.43 μm; 随着激光能量的增加, 试样件表面残余应力和表面显微硬度先增加后减小, 相比初始件分别增加了352 MPa、48 HV; 随着冲击次数的增加, 薄壁件呈现凸面变形, 并且变形量、表面粗糙度增加, 分别增加了45.78 μm、0.65 μm; 试样件表面残余应力和表面显微硬度均增加, 相比初始件分别增加了572 MPa、198.2 HV,但增加量有所减少。

Laser additive manufacturing has the advantages of high efficiency, flexibility and green manufacturing, but the high temperature gradients and heterogeneous phase changes are the causes of tensile stress which lead to deformation and insufficient mechanical properties. Laser additive manufactured GH1131 alloy thin-walled components was treated by laser shock peening, LSP experiments were performed to investigate the effects of different laser energy and impact times on the surface topography, surface roughness, surface residual stress,microhardness of thin-walled components by LSP. The results show that Thin-walled becomes convex deformation relative to the direction of laser shock processing and the deformation,the surface roughness increases with the increase of laser energy and increased by 48.87 μm, 0.43 μm. Surface residual stress and microhardness first increase then decrease with the increase of laser energy and increased by 352 MPa、48 HV. Thin-walled becomes convex deformation relative to the direction of laser shock processing with the increase of impact times. The deformation, the surface roughness increases with the increase of impact times and increased by 45.78 μm, 0.65 μm. Surface residual stress and microhardness increase with the increase of impact times and increased by 572 MPa, 198.2 HV, but the increment decreases.