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Instruments / Technical Area	Publication Details	Published	Actions
I12-JEEP: Joint Engineering, Environmental and Processing	Oxidation induced mechanisms during directed energy deposition additive manufactured titanium alloy builds Caterina Iantaffi , Chu Lun Alex Leung , Yunhui Chen , Shaoliang Guan , Robert C. Atwood , Jedsada Lertthanasarn , Minh-Son Pham , Martina Meisnar , Thomas Rohr , Peter D. Lee Additive Manufacturing Letters 143 DOI: 10.1016/j.addlet.2021.100022 Diamond Proposal Number(s): [20096] Open Access Show Abstract ▼ 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.	Nov 2021

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I12-JEEP: Joint Engineering, Environmental and Processing

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

Caterina Iantaffi , Chu Lun Alex Leung , Yunhui Chen , Shaoliang Guan , Robert C. Atwood , Jedsada Lertthanasarn , Minh-Son Pham , Martina Meisnar , Thomas Rohr , Peter D. Lee

Additive Manufacturing Letters 143

DOI: 10.1016/j.addlet.2021.100022

Diamond Proposal Number(s): [20096]