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以航空发动机叶片制孔为导向,结合飞秒激光对单晶镍基高温合金材料的非热熔性损伤阈值(Φth1)和热熔性损伤阈值(Φth2)特征,研究了飞秒激光能量密度(0<Φ<44.2J/cm2)对制孔重铸层和加工效率的影响规律。研究结果表明:在Φth1<Φ<Φth2时,镍基合金经飞秒激光加工后加工侧壁没有出现明显的重铸物;在Φ>Φth2时,加工侧壁开始出现重铸物,并随着能量密度的增加,重铸层厚度增大。在试验结果的基础上,建立了飞秒激光单脉冲加工深度与能量密度的定量关系。能量密度越高,飞秒激光单脉冲加工深度越大,加工效率越高。
Taking the aero-engine blade hole as the guide, the femtosecond laser energy density (Φth1) and the hot-melt damage threshold (Φth2) 0 <Φ <44.2J / cm2) on the hole recast layer and processing efficiency. The results show that when Φth1 <Φ <Φth2, there is no obvious recast on the processed side wall of Fe-based Ni-based alloy. When Φ> Φth2, As the energy density increases, the thickness of the recast layer increases. Based on the experimental results, the quantitative relationship between the depth and the energy density of the femtosecond laser pulse is established. The higher the energy density, the farther the femtosecond laser pulse processing depth, the higher the processing efficiency.