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Article
Pore Elimination Mechanisms during 3D Printing of Metals
Nature Communications
  • S. Mohammad H. Hojjatzadeh
  • Niranjan D. Parab
  • Wentao Yan
  • Lianyi Chen, Missouri University of Science and Technology
  • For full list of authors, see publisher's website., For full list of authors, see publisher's website.
Abstract

Laser powder bed fusion (LPBF) is a 3D printing technology that can print metal parts with complex geometries without the design constraints of traditional manufacturing routes. However, the parts printed by LPBF normally contain many more pores than those made by conventional methods, which severely deteriorates their properties. Here, by combining in-situ high-speed high-resolution synchrotron x-ray imaging experiments and multi-physics modeling, we unveil the dynamics and mechanisms of pore motion and elimination in the LPBF process. We find that the high thermocapillary force, induced by the high temperature gradient in the laser interaction region, can rapidly eliminate pores from the melt pool during the LPBF process. The thermocapillary force driven pore elimination mechanism revealed here may guide the development of 3D printing approaches to achieve pore-free 3D printing of metals.

Department(s)
Mechanical and Aerospace Engineering
Comments
This work is funded by the Department of Energy's Kansas City National Security Campus Managed by Honeywell Federal Manufacturing & Technologies (FM&T), National Science Foundation, Intelligent Systems Center at Missouri S&T, and partially by the Laboratory Directed Research and Development (LDRD) from Argonne National Laboratory, provided by the Director, Office of Science, of the U.S. Department of Energy under Contract No. DE-AC02-06CH11357.
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2019 The Author(s), All rights reserved.
Creative Commons Licensing
Creative Commons Attribution 4.0
Publication Date
12-1-2019
Citation Information
S. Mohammad H. Hojjatzadeh, Niranjan D. Parab, Wentao Yan, Lianyi Chen, et al.. "Pore Elimination Mechanisms during 3D Printing of Metals" Nature Communications Vol. 10 Iss. 1 (2019) ISSN: 2041-1723
Available at: http://works.bepress.com/lianyi-chen/19/