Study of superalloy topography during ultrahigh intensity nanosecond ultraviolet laser ablation

We report on the topography of holes ablated by an ultrahigh intensity 355 and 266 nm laser with 8 ns pulse width in Ni-base superalloy Inconel 718. The origin of droplets, micropores, and microcracks on the surface of hole is identified. Qualitative differences in the characteristics of microcracks...

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Bibliographic Details
Published in:Journal of applied physics 2002-05, Vol.91 (10), p.6761-6764
Main Authors: Wu, Qihong, Jie, Jiansheng, Ma, Yurong, Yu, Qingxuan, Miao, Bin, Wang, Guanzhong, Liao, Yuan, Fang, Rongchuan, Chen, Xiangli, Wang, Kelvin
Format: Article
Language:English
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Summary:We report on the topography of holes ablated by an ultrahigh intensity 355 and 266 nm laser with 8 ns pulse width in Ni-base superalloy Inconel 718. The origin of droplets, micropores, and microcracks on the surface of hole is identified. Qualitative differences in the characteristics of microcracks indicate that the dominant continuous microcracks result from thermal effects in 355 nm laser ablation, and the dominant island-chain microcrack result from photochemical effects in 266 nm laser ablation. In ultrahigh intensity laser ablation (>200 GW/cm2), the mechanical load on the surface is very significant to the resulting topography, and the grain boundary plays an important role in the origin of the micropores.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1472239