In-situ characterization of laser-powder interaction and cooling rates through high-speed imaging of powder bed fusion additive manufacturing

Scipioni Bertoli, Umberto; Guss, Gabe; Wu, Sheldon; Matthews, Manyalibo J.; Schoenung, Julie M.

doi:10.1016/j.matdes.2017.09.044

Title: In-situ characterization of laser-powder interaction and cooling rates through high-speed imaging of powder bed fusion additive manufacturing

Journal Article · Thu Sep 21 00:00:00 EDT 2017 · Materials & Design

DOI:https://doi.org/10.1016/j.matdes.2017.09.044· OSTI ID:1409929

Scipioni Bertoli, Umberto ^[1]; Guss, Gabe ^[2]; Wu, Sheldon ^[2]; Matthews, Manyalibo J. ^[2]; Schoenung, Julie M. ^[1]

Univ. of California, Irvine, CA (United States). Department of Chemical Engineering and Materials Science
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Materials Science Division

We report detailed understanding of the complex melt pool physics plays a vital role in predicting optimal processing regimes in laser powder bed fusion additive manufacturing. In this work, we use high framerate video recording of Selective Laser Melting (SLM) to provide useful insight on the laser-powder interaction and melt pool evolution of 316 L powder layers, while also serving as a novel instrument to quantify cooling rates of the melt pool. The experiment was performed using two powder types – one gas- and one water-atomized – to further clarify how morphological and chemical differences between these two feedstock materials influence the laser melting process. Finally, experimentally determined cooling rates are compared with values obtained through computer simulation, and the relationship between cooling rate and grain cell size is compared with data previously published in the literature.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344; 15-ERD-037

OSTI ID:: 1409929

Alternate ID(s):: OSTI ID: 1549312

Report Number(s):: LLNL-JRNL-738525

Journal Information:: Materials & Design, Vol. 135, Issue C; ISSN 0264-1275

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 208 works

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Title: In-situ characterization of laser-powder interaction and cooling rates through high-speed imaging of powder bed fusion additive manufacturing

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