About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques
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Presentation Title |
Porosity Formation and Entrapment in Directed Energy Deposition Through Highspeed In-situ Imaging |
Author(s) |
Samantha Webster, Kornel Ehmann, Jian Cao |
On-Site Speaker (Planned) |
Samantha Webster |
Abstract Scope |
Laser-based metal additive manufacturing (AM) has become increasingly popular due to its flexibility in materials and geometry. Inherent process defects such as porosity have limited the use of AM-fabricated components in industry, however, and the conditions under which defects form are still not fully understood across laser-based AM platforms. 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), but 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 measure melt-pool geometry and fluctuations over a large range of energy densities and mass flowrates. Melt-pool conditions leading to pore formation and pore entrapment are elucidated and will be discussed. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |