Numerical study of melt hydrodynamics in pulsed laser processing of nickel-based superalloy

Author:

Yang JianORCID,Tan JiqingORCID,Zhang Fuping,Chen Long,Xu Hongxing

Abstract

Abstract Pulsed laser processing (PLP) of materials has wide-spread applications in the industry, yet the underlying complex material response to the incident laser pulse especially the melt flow mechanism is not fully understood. Knowledge of melt hydrodynamics can provide systematic theoretical guidance for the improvement of PLP quality. In this paper, a two-dimensional numerical model was built to simulate melt flow during PLP of nickel-based superalloy. The driving forces for melt hydrodynamics at different stages of laser pulse irradiation were studied comprehensively. Numerical results reveal that thermo-capillary stress drives radially-outward melt flow at the initial stage of laser pulse irradiation. At the middle stage, evaporation-induced recoil pressure is the dominant driving force for melt pool deformation, creating a depression at the center and a hump at the periphery. Thermo-capillary force has a minor effect on melt pool deformation but a large contribution to the flow velocity field. At the post-irradiation stage, the peripheral molten hump flows back rapidly and the melt pool experiences some gradually damping oscillations under the action of Young-Laplace stress. Moreover, it was demonstrated that laser power density plays an important role in deciding the melt flow characteristics and the relative contributions of different driving forces. The results in this study provide an unambiguous physical picture of the melt hydrodynamics in pulsed laser processing.

Funder

East China Normal University

Publisher

IOP Publishing

Subject

Condensed Matter Physics,Mathematical Physics,Atomic and Molecular Physics, and Optics

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Laser processing of NiTi alloy surface deep structure and optimization;Materials and Manufacturing Processes;2024-09-08

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3