Simulation and experimental analysis of melt pool evolution in laser engineered net shaping

IF 3.2 3区工程技术 Q2 MECHANICS

Theoretical and Applied Mechanics Letters Pub Date : 2022-09-01 DOI:10.1016/j.taml.2022.100366

Zhuangzhuang Mao , Wei Feng , Ce Hao , Zhanwei Liu

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引用次数: 1

Abstract

In this work, the evolution of melt pool under single-point and single-line printing in the laser engineered net shaping (LENS) process is analyzed. Firstly, the basic structure of the melt pool model of the LENS process is established and the necessary assumptions are made. Then, the establishment process of the multi-physical field model of the melt pool is introduced in detail. It is concluded that the simulation model results are highly consistent with the online measurement experiment results in terms of melt pool profile, space temperature gradient, and time temperature gradient. Meanwhile, some parameters, such as the 3D morphology and surface fluid field of the melt pool, which are not obtained in the online measurement experiment, are analyzed. Finally, the influence of changing the scanning speed on the profile, peak temperature, and temperature gradient of the single-line melt pool is also analyzed, and the following conclusions are obtained: With the increase in scanning speed, the profile of the melt pool gradually becomes slender; The relationship between peak temperature and scanning speed is approximately linear in a certain speed range; The space temperature gradient at the tail of the melt pool under different scanning speeds hardly changes with the scanning speed, and the time temperature gradient at the tail of the melt pool is in direct proportion to the scanning speed.

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激光工程成形过程中熔池演化的仿真与实验分析

本文对激光工程网成形(LENS)过程中单点单线打印熔池的演变进行了分析。首先，建立了LENS过程熔池模型的基本结构，并进行了必要的假设。然后详细介绍了熔池多物理场模型的建立过程。结果表明，在熔池剖面、空间温度梯度和时间温度梯度方面，模拟模型结果与在线测量实验结果高度一致。同时，对在线测量实验中未获得的熔池三维形貌和表面流场等参数进行了分析。最后，分析了改变扫描速度对单线熔池轮廓、峰值温度和温度梯度的影响，得到以下结论:随着扫描速度的增加，熔池轮廓逐渐变细;峰值温度与扫描速度在一定速度范围内近似成线性关系;不同扫描速度下熔池尾部空间温度梯度随扫描速度变化不大，熔池尾部时间温度梯度与扫描速度成正比。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Theoretical and Applied Mechanics Letters MECHANICS-

CiteScore

6.20

自引率

2.90%

发文量

545

审稿时长

12 weeks

期刊介绍： An international journal devoted to rapid communications on novel and original research in the field of mechanics. TAML aims at publishing novel, cutting edge researches in theoretical, computational, and experimental mechanics. The journal provides fast publication of letter-sized articles and invited reviews within 3 months. We emphasize highlighting advances in science, engineering, and technology with originality and rapidity. Contributions include, but are not limited to, a variety of topics such as: • Aerospace and Aeronautical Engineering • Coastal and Ocean Engineering • Environment and Energy Engineering • Material and Structure Engineering • Biomedical Engineering • Mechanical and Transportation Engineering • Civil and Hydraulic Engineering Theoretical and Applied Mechanics Letters (TAML) was launched in 2011 and sponsored by Institute of Mechanics, Chinese Academy of Sciences (IMCAS) and The Chinese Society of Theoretical and Applied Mechanics (CSTAM). It is the official publication the Beijing International Center for Theoretical and Applied Mechanics (BICTAM).