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 |
Capturing Pore Formation During Laser Blown Powder Directed Energy Deposition |
Author(s) |
Peter D. Lee, Yunhui Chen, Lorna Sinclair, CL Alex Leung, Samuel Clark, Sebastian Marussi , Robert C. Atwood, Martyn Jones, Gavin J Baxter |
On-Site Speaker (Planned) |
Peter D. Lee |
Abstract Scope |
Laser Blown Powder Directed Energy Deposition (LBP-DED) promises to produce and repair unique, high quality components for aerospace applications. However, the solidification mechanisms controlling the formation of continuous, pore free tracks are still poorly understood. The solidification rates during the process are 102 to 105 degrees per second, producing conditions that can lead to microstructural features (porosity, epitaxial growth) that may reduce performance. Using fast synchrotron X-ray imaging and a unique in situ and operando LBP-DED rig, we capture the mechanisms by which pores form and are pushed for a range of conditions. We find that the mechanisms of pore formation, capture by the solidification front, and motion in the pool vary significantly for different alloys and conditions, providing new insights into how to control the size and location of pores. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |