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.
期刊介绍:
Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance.
Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.