中文摘要：

基于激光修复技术，采用镍基高温合金FGH95粉末对航空发动机常用材料GH4169合金进行不同激光线能量密度q下激光修复对比试验，对修复试样进行弯曲性能测试与金相分析。研究激光线能量密度对修复试样弯曲性能的影响，探讨激光修复后试样弯曲性能变化的微观机理。结果表明：修复试样弯曲强度与无损试样接近，基本达到无损试样的弯曲性能。当q=120．0J／mm^2时，修复试样弯曲强度最大，为827．16MPa，高于无损试样0．5％。随着激光线能量密度的增加，修复试样弯曲强度先增加后减小。在较高激光线能量密度下（154．3J／mm^2），因修复区组织枝晶粗化，导致修复试样弯曲性能下降。

英文摘要：

Laser repair contrast experiments by using nickel-based superalloy material FGH95 powder are performed on the GH4169 that is commonly used in aero-engine filed under different laser linear energy densities q. By testing the flexural property and analyzing the metallic phase, the influence of the laser linear energy density on flexural properties of repaired samples and microscopic mechanism of fiexural property change are studied. The results indicate that the flexural strength of repaired samples is close to that of original sample and basically achieves flexural property of original sample. When q = 120.0 J/mm2 , the flexural strength of 827.16 MPa is maximum and has a 0.5 percent larger than that of original sample. With laser linear energy increasing, the flexural strength of repaired samples first increases and then decreases. The flexural property decreases at a higher laser energy density of 154.3 J/mm^2 due to the coarsening of repaired area dendrites.