高速激光定向能沉积过程中不同基底材料上的熔池动力学

IF 1.7 4区 工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Laser Applications Pub Date : 2023-11-01 DOI:10.2351/7.0001145
Zefeng Wu, P. O’Toole, C. Hagenlocher, M. Qian, Milan Brandt, Jarrod Watts
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引用次数: 0

摘要

高速激光定向能沉积(HSL-DED)是激光定向能沉积工艺的一种变体,它使用的是散焦金属粉末流,加工速度通常超过 5 米/分钟。然而,对 HSL-DED 中激光束、粉末流和基底表面之间的相互作用尚未进行广泛研究。本研究使用带有窄带通滤波器的专用 XIRIS XVC-1000 焊接相机来记录相互作用现象。这些观察首先是在没有粉末输送的情况下进行的,使用的是激光表面熔化技术,加工速度高达 20 米/分钟,激光功率高达 3 千瓦。然后使用相同的参数组合进行了带粉末输送的 HSL-DED 对比分析。对激光表面熔化和 HSL-DED 的现场观察发现,激光光斑和熔池边界之间存在物理分离,即熔池滞后。在给定的工艺条件下,不同基材的化学成分和由此产生的热物理性质会对高速激光与材料相互作用过程中的熔池动态产生显著影响。这项工作的发现有助于更好地理解和控制 HSL-DED 中的熔池动力学。
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Melt pool dynamics on different substrate materials in high-speed laser directed energy deposition process
High-speed laser directed energy deposition (HSL-DED) is a variant of the laser directed energy deposition process where a defocused metal powder stream is used, and it typically involves processing speeds exceeding 5 m/min. However, the interactions between the laser beam, powder stream, and substrate surface in HSL-DED have not been extensively studied. This study used a specialized XIRIS XVC-1000 welding camera with a narrow bandpass filter to record the interaction phenomenon. These observations were first carried out without powder delivery, using laser surface melting techniques, and involved processing speeds of up to 20 m/min and laser powers of up to 3 kW. HSL-DED with powder delivery was then conducted with the same parameter combinations for comparative analysis. The in situ observations in laser surface melting and HSL-DED identified a physical separation between the laser spot and the melt pool boundary, referred to as melt pool lag. Different substrates’ chemical compositions and the resulting thermophysical properties significantly impact melt pool dynamics during the high-speed laser-material interactions for a given process condition. The findings from this work have enabled a better understanding and control of melt pool dynamics in HSL-DED.
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来源期刊
CiteScore
3.60
自引率
9.50%
发文量
125
审稿时长
>12 weeks
期刊介绍: The Journal of Laser Applications (JLA) is the scientific platform of the Laser Institute of America (LIA) and is published in cooperation with AIP Publishing. The high-quality articles cover a broad range from fundamental and applied research and development to industrial applications. Therefore, JLA is a reflection of the state-of-R&D in photonic production, sensing and measurement as well as Laser safety. The following international and well known first-class scientists serve as allocated Editors in 9 new categories: High Precision Materials Processing with Ultrafast Lasers Laser Additive Manufacturing High Power Materials Processing with High Brightness Lasers Emerging Applications of Laser Technologies in High-performance/Multi-function Materials and Structures Surface Modification Lasers in Nanomanufacturing / Nanophotonics & Thin Film Technology Spectroscopy / Imaging / Diagnostics / Measurements Laser Systems and Markets Medical Applications & Safety Thermal Transportation Nanomaterials and Nanoprocessing Laser applications in Microelectronics.
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