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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

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.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [1]
  1. Univ. of California, Irvine, CA (United States). Department of Chemical Engineering and Materials Science
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Materials Science Division
Publication Date:
Report Number(s):
LLNL-JRNL-738525
Journal ID: ISSN 0264-1275
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Materials & Design
Additional Journal Information:
Journal Volume: 135; Journal Issue: C; Journal ID: ISSN 0264-1275
Publisher:
Elsevier
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Powder bed fusion additive manufacturing; Selective Laser Melting; 316 L stainless steel; Water atomized powder; High speed imaging; Ultra-high cooling rate
OSTI Identifier:
1409929

Scipioni Bertoli, Umberto, Guss, Gabe, Wu, Sheldon, Matthews, Manyalibo J., and Schoenung, Julie M.. In-situ characterization of laser-powder interaction and cooling rates through high-speed imaging of powder bed fusion additive manufacturing. United States: N. p., Web. doi:10.1016/j.matdes.2017.09.044.
Scipioni Bertoli, Umberto, Guss, Gabe, Wu, Sheldon, Matthews, Manyalibo J., & Schoenung, Julie M.. In-situ characterization of laser-powder interaction and cooling rates through high-speed imaging of powder bed fusion additive manufacturing. United States. doi:10.1016/j.matdes.2017.09.044.
Scipioni Bertoli, Umberto, Guss, Gabe, Wu, Sheldon, Matthews, Manyalibo J., and Schoenung, Julie M.. 2017. "In-situ characterization of laser-powder interaction and cooling rates through high-speed imaging of powder bed fusion additive manufacturing". United States. doi:10.1016/j.matdes.2017.09.044. https://www.osti.gov/servlets/purl/1409929.
@article{osti_1409929,
title = {In-situ characterization of laser-powder interaction and cooling rates through high-speed imaging of powder bed fusion additive manufacturing},
author = {Scipioni Bertoli, Umberto and Guss, Gabe and Wu, Sheldon and Matthews, Manyalibo J. and Schoenung, Julie M.},
abstractNote = {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.},
doi = {10.1016/j.matdes.2017.09.044},
journal = {Materials & Design},
number = C,
volume = 135,
place = {United States},
year = {2017},
month = {9}
}