Multi-pulses ablation threshold of Ni-based superalloy irradiated by ultrafast laser with different pulse duration
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摘要: 实验研究了激光脉冲宽度和脉冲个数对镍基高温合金材料去除阈值的影响，分别在290 fs，1 ps和7 ps脉宽的激光下，使用1，10，50，100，300，500和1000个不同能量的激光脉冲辐照高温合金样品表面。实验结果表明，烧蚀坑尺寸会随脉冲数的增加而增加，而脉冲宽度的增加会加大脉冲个数对烧蚀坑直径的影响。通过烧蚀坑直径的平方值与激光脉冲能量之间存在的对数关系，得到了不同脉冲宽度下镍基高温合金的多脉冲材料阈值。3种不同脉宽下的高温合金多脉冲去除阈值都存在显著的累积效应。根据去除阈值计算得到290 fs，1 ps和7 ps脉宽下的累积效应系数分别为0.88，0.86和0.78。Abstract: The effects of the laser pulse duration and the number of pulses on the ablation threshold of Ni-based superalloy were experimentally investigated. In this experiment, Ni-based superalloy samples were irradiated by 1, 10, 50, 100, 300, 500 and 1000 laser pulses with different pulse duration, respectively, and pulse duration 290 fs, 1 ps and 7 ps were explored. The diameter of ablation holes expands with the increase of laser pulse and the effect of pulse number on the diameter of ablation holes increases with the pulse duration from the experiments. By analyzing the relationship between the diameter of ablation holes and laser pulse energy, multi-pulse ablation threshold of Ni-based superalloy irradiated by ultrafast laser with different pulse duration can be obtained. No matter what the pulse duration of the laser was, the incubation effects of multi-pulse irradiation on the surface of the superalloy were significant. And the incubation coefficient for the thresholds calculated by diameter respectively in 290 fs, 1 ps, and 7 ps is fitted to be 0.88, 0.86 and 0.78.
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Key words:
- ultrafast laser /
- superalloy /
- multi-pulses irradiation /
- ablation threshold /
- incubation effects
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图 1 高温合金样品表面磨抛前后的粗糙度测试结果
Figure 1. Surface roughness test results of superalloy samples
图 2 超快脉冲激光加工系统示意图
Figure 2. Schematic diagram of ultrashort pulse laser processing system
图 3 脉宽为290 fs时，100个不同脉冲能量的激光脉冲辐照后的烧蚀坑形貌
Figure 3. Morphologies of ablation holes irradiated by 100 laser pulses with a pulse width 290 fs at different pulse energy
(w represents ablation hole diameter)
图 4 高温合金表面在不同脉宽的超快激光作用下形成的烧蚀坑直径与激光能量的关系曲线
Figure 4. Curves of ablation hole diameter vs laser energy for the superalloy surface after the irradiation of ultrafast laser with different pulse duration
图 5 高温合金表面在不同脉宽的超快激光作用下形成的烧蚀坑直径的平方值与激光能量的关系曲线
Figure 5. Curves of square of ablation hole diameter vs laser energy for the superalloy surface irradiated by ultrafast laser with different pulse duration
图 6 不同脉宽下的高温合金去除阈值和脉冲数的关系曲线
Figure 6. Curves of the ablation threshold vs number of pulses
表 1 实验中使用的高温合金样品的元素组成
Table 1. Elemental composition of Ni-based superalloy sample
element atom fraction/% Ni 50.08 C 24.68 Al 8.76 Co 7.45 Cr 3.83 Si 3.04 O 1.58 Mo 0.58 
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表 2 不同脉宽的脉冲激光作用下的高温合金的多脉冲去除阈值
Table 2. Multi-pulse ablation thresholds of Ni-based superalloy irradiated by ultrafast lasers with different pulse durations
pulse duration/fs material removal threshold/(J·cm−2) 1 10 50 100 300 500 1000 290 0.101 0.079 0.058 0.054 0.049 0.049 0.047 1000 0.106 0.071 0.055 0.050 0.046 0.042 0.042 7000 0.129 0.094 0.061 0.050 0.037 0.034 0.031
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表 3 不同脉宽下多脉冲去除阈值的累积效应系数
Table 3. Incubation coefficient values corresponding to different pulse durations
pulse duration/fs incubation coefficient ξ 290 0.88 1000 0.86 7000 0.78
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