Characteristics of micro-hole formation during fibre laser drilling of aerospace superalloy
Characteristics of micro-hole formation during fibre laser drilling of aerospace superalloy
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DOI：
10.1016/j.precisioneng.2018.10.002
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发表时间：
2019-01-01
影响因子：
3.6
通讯作者：
Dunleavey, J.
中科院分区：
文献类型：
--
作者：
Marimuthu, S.;Antar, M.;Dunleavey, J.
高纵横比微孔如今越来越多地用于各种应用，包括航空航天、医疗和汽车。本文采用实验和数值模拟相结合的方法，研究了准连续光纤激光在镍基高温合金上的微孔（约100 μ m）加工特性。使用冲击技术在2 mm厚的镍高温合金材料上钻取直径约100 μ m的微孔。主要的研究集中在理解的微孔形成过程中的激光与材料的相互作用。利用有限元建模工具和高速摄像机辅助研究了毫秒激光打孔过程中微孔形成的基本原理。在微孔钻孔过程中，无论激光参数如何，熔体喷射在约80 μ s后开始，并且总熔体喷射持续时间取决于激光能量和脉冲持续时间。实验结果表明，当激光脉冲宽度为0.1ms，激光脉冲能量为1J，冲击次数为15次时，钻一个直径约为100 μ m的微孔所需时间为15ms。
High aspect ratio micro-holes are nowadays increasingly used in various applications including aerospace, medical and automotive. This research investigates the characteristic of quasi-CW fibre laser micro-hole drilling (similar to 100 mu m) of nickel superalloy using experimentation and numerical modelling. Micro-holes of diameter around 100 mu m was drilled using percussion technique over a 2 mm thick nickel superalloy material. The main investigation focuses on understanding the micro-hole formation during the laser interaction with the material. Finite element modelling tool and high-speed imaging camera had been used to assist in understanding the basic-fundamentals of micro-hole formation during the millisecond laser drilling process. During the micro-hole drilling process, irrespective of the laser parameters, the melt ejections start after around 80 mu s, and the total melt ejection duration depends on laser energy and pulse duration. The experimental results showed that it takes 15 ms to drill a micro-hole of diameter around 100 mu m using a laser pulse duration of 0.1 ms, laser pulse energy of 1 J and 15 number of percussion pulses.