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Oxidation induced mechanisms during directed energy deposition additive manufactured titanium alloy builds

Iantaffi, Caterina, Leung, Chu Lun Alex, Chen, Yunhui, Guan, Shaoliang, Atwood, Robert C., Lertthanasarn, Jedsada, Pham, Minh-Son, Meisnar, Martina, Rohr, Thomas and Lee, Peter D. 2021. Oxidation induced mechanisms during directed energy deposition additive manufactured titanium alloy builds. Additive Manufacturing Letters 1 , 100022. 10.1016/j.addlet.2021.100022

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Additional Information: This is an open access article under the CC BY-NC-ND license
ISSN: 2772-3690
Date of First Compliant Deposit: 16 December 2021
Date of Acceptance: 17 November 2021
Last Modified: 04 May 2023 01:51

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