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针对飞秒激光加工镍基单晶高温合金材料,在能量密度为0~12.8J/cm2和脉冲个数为0~8000范围内,对表面损伤和加工侧壁区域进行了显微形貌分析,研究了不同能量密度和脉冲个数情况下的损伤机制,不同损伤机制的损伤阈值和热效应。镍基单晶高温合金经飞秒激光加工后,呈现两种损伤机制,分别为非热熔性损伤和热熔性损伤,单脉冲损伤阈值分别为0.23J/cm2和1.21J/cm2,孕育系数分别为0.90和0.92。在此基础上,建立了损伤机制和损伤阈值与能量密度和脉冲个数的定量关系,实验结果对加工无微裂纹和无再铸层的高质量镍基航空器件的工艺选择有实际指导意义。
For the femtosecond laser processing of nickel-based single crystal superalloy materials, the micro-topography of the surface damage and the processed sidewall region was analyzed in the energy density of 0 ~ 12.8J / cm2 and pulse number of 0 ~ 8000, The damage mechanism under different energy density and pulse number, the damage threshold and thermal effect of different damage mechanisms were studied. The two kinds of damage mechanisms of Ni-based single crystal superalloy after femtosecond laser processing are non-hot-melt damage and hot-melt damage respectively. The single-pulse damage thresholds are 0.23J / cm2 and 1.21J / cm2, Respectively 0.90 and 0.92. On this basis, the quantitative relationship between the damage mechanism, the damage threshold, the energy density and the number of pulses is established. The experimental results are of practical significance for the process selection of high quality Ni-based aviation devices without micro-cracks and no recast layers.