目的 研究超声振动对激光修复镍基高温合金梯形槽修复区显微组织及力学性能的影响，为实现高温合金的高质量激光增材修复提供参考。方法 以镍基高温合金为基体和修复材料，并将超声振动引入激光增材修复过程中。采用光学显微镜，对比分析有无超声振动时梯形槽修复区的显微组织结构;采用电子背散射衍射(EBSD)、扫描电镜(SEM)、能谱仪(EDS)等设备，表征不同超声功率下梯形槽修复区的晶粒取向、析出相分布和元素组成;结合试验研究与机理分析，揭示超声振动对修复区晶粒特征和缺陷的影响规律。结果 超声振动减少了梯形槽修复区底角的缺陷，修复区一次枝晶间距平均值由6.74 μm减至3.38 μm，晶粒平均尺寸由58.4 μm降至50.2 μm，等轴晶占比由46.6%增至63.4%，Laves相析出含量减少。当超声功率为4 000 W时，梯形槽修复区的平均显微硬度为256.2HV0.2，相较于无超声振动时提高了17.7HV0.2。结论 在超声振动作用下，梯形槽底角的熔合不良缺陷得到抑制，一次枝晶间距减小，长条状Laves相转变为颗粒状Laves相，且随着超声功率的增大，梯形槽修复区的平均显微硬度逐渐增大。

Owing to the severe service conditions, components made from nickel-based superalloys are susceptible to cracking and wear. Laser repair technology can restore the mechanical properties of damaged structural components, thereby prolonging their service life. To enhance the quality of repaired components, ultrasonic vibration has been integrated into the laser repair process to suppress defects and improve performance. The work aims to investigate the impact of ultrasonic vibration on the microstructure and mechanical properties of the trapezoidal groove repair zone in nickel-based superalloy components repaired by laser technology.