About this Abstract |
Meeting |
2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)
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Symposium
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Process Development
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Presentation Title |
Effect of Powder Velocity on Porosity Formation in Directed Energy Deposition |
Author(s) |
Samantha Webster, Kornel Ehmann, Jian Cao |
On-Site Speaker (Planned) |
Samantha Webster |
Abstract Scope |
Inherent process defects such as porosity currently limit the use of additive manufacturing (AM) fabricated components in industry due to shorter fatigue life, potential for catastrophic failure, and lower strength. The conditions under which these defects form, and their corresponding mechanisms, are still not fully understood across laser-based AM platforms. While high-speed synchrotron imaging has been used for ¬in situ observation of melt-pool dynamics, powder entrainment, and defect formation in laser powder bed fusion (LPBF), phenomena in powder-blown processes such as directed energy deposition (DED) will be very different due to much more stochastic and violent powder delivery. This study addresses those differences by using the X-ray imaging technique at the Advanced Photon Source and a high through-put DED set-up to observe types of pore formation. An analytical model adapted from hydrophobic solid particle entrance into a liquid is presented, and the importance of powder velocity will be discussed. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |