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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/mm2时,修复试样弯曲强度最大,为827.16 MPa,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/mm2),因修复区组织枝晶粗化,导致修复试样弯曲性能下降。
Based on the laser repairing technology, the laser-repaired contrast test of GH4169 alloy, which is the common material of aeroengine, was conducted by using laser heat treatment of nickel-base superalloy FGH95 powder. The bending properties and metallographic analysis of repaired samples were carried out. The influence of the energy density of the laser line on the bending properties of the repaired specimen was studied, and the microscopic mechanism of the bending property of the laser repaired specimen was investigated. The results show that the bending strength of the repaired specimen is close to that of the nondestructive specimen, and the bending property of the nondestructive specimen is basically reached. When q = 120.0J / mm2, the bending strength of the repaired specimen is the highest, which is 827.16 MPa, which is higher than that of the nondestructive specimen by 0.5%. With the increase of the laser energy density, the bending strength of the repaired sample first increases and then decreases. At higher laser line energy densities (154.3 J / mm2), the dendrite coarsening resulted in a decrease in the flexural properties of the repaired specimens.