Backscatter absorption spectroscopy for process monitoring in powder bed fusion

IF 1.1 Q4 OPTICS
M. Beuting, A. Fairhall, R. H. Goldsmith, L. Chen, S. T. Sanders
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引用次数: 0

Abstract

7 This paper presents an optical sensor that employs backscatter tunable laser absorption 8 spectroscopy (BTLAS) for in-situ monitoring of laser powder bed fusion (L-PBF). The measured 9 signal depends on the conditions within the gas vapor cavity, whose dynamic interaction with 10 the melt pool surface is known to be a major cause of defects in the final part. The sensor 11 spectrally resolves the shape of the absorption lines of metal vapors, which is influenced by gas 12 pressure, temperature, concentration, and velocity. This pilot study demonstrates that the 13 absorption line strength and line shape of Ti varies significantly with changes in the process 14 chamber pressure and laser power when processing a Ti-6Al-4V, potentially allowing the 15 technique to be applied for process monitoring and closed-loop control. Additionally, the 16 technique provided a signal under near-vacuum conditions, suggesting its utility for fundamental 17 research on electron beam powder bed fusion (EB-PBF). The authors outline future steps for 18 integrating this sensor into existing L-PBF systems for real-time operando process monitoring. 19 Laser-induced fluorescence (LIF) was also observed during the experiments, which may provide 20 further opportunities for in situ process monitoring.
用于监测粉末床熔化过程的背散射吸收光谱法
7 本文介绍了一种利用背散射可调激光吸收光谱(BTLAS)对激光粉末床熔融(L-PBF)进行现场监测的光学传感器。测得的信号 9 取决于气体蒸汽腔内的条件,众所周知,气体蒸汽腔与熔池表面的动态相互作用是造成最终部件缺陷的主要原因。传感器 11 可分辨金属蒸汽吸收线的形状,而金属蒸汽吸收线的形状受气体 12 压力、温度、浓度和速度的影响。这项试验研究表明,在加工 Ti-6Al-4V 时,钛的 13 吸收线强度和线形会随着工艺室 14 压力和激光功率的变化而发生显著变化,因此该技术有可能应用于工艺监控和闭环控制。此外,该技术还能在近真空条件下提供信号,这表明它可用于电子束粉末床融合(EB-PBF)的基础研究。作者概述了将该传感器集成到现有 L-PBF 系统中进行实时操作过程监控的未来步骤。19 实验期间还观察到了激光诱导荧光 (LIF),这可能会为原位过程监控提供更多机会。
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
CiteScore
3.50
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