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 |
In-situ Synchrotron X-ray Imaging of Titanium Alloy Powder Sintering during Laser Blown Powder Directed Energy Deposition |
Author(s) |
Lorna Sinclair, Yunhui Chen, Sebastian Marussi, Samuel J. Clark, Chu Lun Alex Leung, Saurabh Shah, Robert Atwood, Thomas Connolley, Martyn Jones, Gavin Baxter, Peter D. Lee |
On-Site Speaker (Planned) |
Lorna Sinclair |
Abstract Scope |
Laser Blown Powder Directed Energy Deposition (LBP-DED) is a promising technique for rapid part production, coatings, and repair applications. However, metal vapour plumes and oxides on the powder surface can result in lightly sintered powder adhering to the surface during titanium alloy builds. To understand this phenomenon, a process replicator was used to carry out in situ and operando investigations of the process using high speed synchrotron X-ray imaging. A range of process parameters was explored to investigate the conditions under which sinter occurred. Several hypotheses for this mechanism were tested, including aluminium vapour deposition onto the powder, oxide formation, and direct heating leading to surface wetting. The results suggest probable mechanisms, and illustrate that the sintered powder can be mitigated when appropriate parameters are used. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |