Numerical simulation and experimental study on picosecond laser ablation of stainless steel
Numerical simulation and experimental study on picosecond laser ablation of stainless steel
复制标题
不锈钢皮秒激光烧蚀数值模拟与实验研究
DOI：
10.1016/j.optlastec.2020.106150
复制
发表时间：
2020-07-01
影响因子：
5
通讯作者：
Xu, Bin
中科院分区：
文献类型：
--
作者：
Wang, Xingsheng;Huang, Yuke;Xu, Bin
对超热激光与不锈钢相互作用的基础性研究，将有助于了解超热激光对不锈钢的烧蚀特性，优化烧蚀性能。建立了皮秒激光烧蚀不锈钢的二维有限元模型，该模型包括两个温度方程、相爆炸机制和变形几何模型。单脉冲和多脉冲烧蚀与各种激光能量密度进行了模拟使用开发的模型。然后，用皮秒激光对不锈钢进行了相应的激光能量密度和脉冲数的烧蚀实验。结果表明，在单脉冲激光辐照下，烧蚀深度和烧蚀直径随激光能量密度的增大而增大。对于多脉冲烧蚀，烧蚀深度随脉冲数的增加几乎呈线性增加，而烧蚀直径变化不大。预测值高估了实验烧蚀深度，特别是在高脉冲数时，但趋势相似。
A fundamental study of the interaction between ultrashot laser and stainless steel will be useful in understanding the ablation characteristics and optimizing the ablation performance. A two dimensional finite element model consisting of two temperature equations, phase explosion mechanism and deformed geometry module was developed to simulate picosecond laser ablation of stainless steel. Single- and multi-pulse ablations with various laser fluences were simulated using the developed model. Thereafter, ablation experiments on stainless steel with the corresponding laser fluences and pulse numbers were conducted using a picosecond laser. It was found that the ablation depth and diameter increased with the increasing laser fluence under single-pulse irradiation. For multi-pulse ablation, the depth increased almost linearly with the increasing pulse number, whereas the ablation diameter changed a little. The predicted data overestimated the experimental ablation depths especially at high pulse number, but with the similar trend.