Iantaffi, Caterina;
Leung, Chu Lun Alex;
Chen, Yunhui;
Guan, Shaoliang;
Atwood, Robert C;
Lertthanasarn, Jedsada;
Pham, Minh-Son;
... Lee, Peter D; + view all
(2021)
Oxidation induced mechanisms during directed energy deposition additive manufactured titanium alloy builds.
Additive Manufacturing Letters
, 1
, Article 100022. 10.1016/j.addlet.2021.100022.
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Abstract
To prevent oxygen contamination, additive manufacturing (AM) techniques normally operate in an inert gas chamber (GC). An alternative method, useful for large builds and components repair, is the application of localised shielding gas (LSG). The effect of oxygen contamination on Ti6242 during directed energy deposition (DED) AM using an inert GC compared to LSG was investigated by in situ synchrotron x-ray experiments. When processing in LSG mode, the amount of oxygen absorbed from the atmosphere was sufficient to reverse the Marangoni flow leading to an alteration of the molten pool geometry and strongly influencing defect formation. Microstructural analysis reveals that, at high oxygen levels, the commonly developed α' martensitic microstructure was completely suppressed, forming precipitation of a tetra modal microstructure of α phase consisting of globular, primary and secondary lamellae (in colonies) and basketweave structure. These results help elucidate the influence of oxygen contamination in additively manufactured Ti alloys, potentially enabling improved industrial practices for AM of titanium alloy.
| Type: | Article |
|---|---|
| Title: | Oxidation induced mechanisms during directed energy deposition additive manufactured titanium alloy builds |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.addlet.2021.100022 |
| Publisher version: | https://doi.org/10.1016/j.addlet.2021.100022 |
| Language: | English |
| Additional information: | © 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) |
| Keywords: | Titanium alloys, Oxidation, Laser additive manufacturing, Directed-energy deposition |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10160960 |
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