Authors: Jing Lv Xia Dong Kedian Wang Wenqiang Duan Zhengjie Fan Xuesong Mei
Publish Date: 2016/01/09
Volume: 86, Issue: 5-8, Pages: 1443-1451
Abstract
An Inconel 718 sample was drilled in air and water using a diodepumped nanosecond pulse laser with a pulse width of 8 ns and a wavelength of 532 nm The surface crosssection and inwall morphology were analyzed with a confocal laser scanning microscope and a scanning electron microscope The pinnacle at the bottom of holes was more prone to exposure during waterassisted drilling However the inwall of those holes was more rough To better understand the mechanism of underwater drilling the effects of pulse number laser energy density and water layer thickness were evaluated An increase in the diameter of holes and a decrease in the debris and spatters on the surface were observed compared with the holes drilled in air Also an increase in the etching rate was observed under the highenergy condition The physical effects of high pressure fabricated by the bubbles and plasma in a water layer were evaluated
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