23 March 2005 Optimization of laser microdrilling in heat-resisting alloys
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Proceedings Volume 5777, XV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers; (2005) https://doi.org/10.1117/12.611065
Event: XV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 2004, Prague, Czech Republic
Abstract
Drilling of deep microholes (150÷500 microns and aspect ration 20÷50) in high-temperature alloys finds today wide application in different industries. The realization of high aspect ratio drilling demands pulses with the essentially high energy that results in strong shielding laser radiation by plasma. Plasma also can become a secondary heat source (more longer lived, than laser pulse), which in result increases of recast layer thickness on lateral walls and deforms the hole shape. Results of experiments on drilling deep microholes are given. As a source of laser radiation in experiments the Nd:YAG laser, generating sequence of the ms- trains of pulses with duration 150-550 ns and the repetition rate 3,5-50 kHz was used. With a 150 mm focal length lens, the intensity at the workpiece (the beam diameter 120 μm) can be as high as 109-1010 W/cm2. The recast layers thickness and optimum microdrilling regimes with and without the assisted gases were determined with help of a microstructure analysis.
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Victor A. Serebryakov, Victor A. Serebryakov, M. Volkov, M. Volkov, Xiaobin Zhang, Xiaobin Zhang, } "Optimization of laser microdrilling in heat-resisting alloys", Proc. SPIE 5777, XV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, (23 March 2005); doi: 10.1117/12.611065; https://doi.org/10.1117/12.611065
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