Chen, Y;
Clark, SJ;
Sinclair, L;
Leung, CLA;
Marussi, S;
Connolley, T;
Atwood, RC;
... Lee, PD; + view all
(2021)
Synchrotron X-ray imaging of directed energy deposition additive manufacturing of titanium alloy Ti-6242.
Additive Manufacturing
, 41
, Article 101969. 10.1016/j.addma.2021.101969.
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Abstract
Directed Energy Deposition Additive Manufacturing (DED-AM) is transformative for the production of larger, geometrically complex metallic components. However, the mechanical properties of titanium alloy DED-AM components do not always reach their full potential due to microstructural features including porosity and regions of lack of fusion. Using in situ and operando synchrotron X-ray imaging we gain insights into key laser-matter interaction and microstructural feature formation mechanisms during DED-AM of Ti-6242. Analysis of the process conditions reveals that laser power is dominant for build efficiency while higher traverse speed can effectively reduce lack of fusion regions. We also elucidate the mechanisms underlying several physical phenomena occurring during the deposition of titanium alloys, including the formation of a saddle-shaped melt pool and pore pushing. The findings of this work clarify the transient kinetics behind the DED-AM of titanium alloys and can be used as a guide for optimising industrial additive manufacturing processes.
| Type: | Article |
|---|---|
| Title: | Synchrotron X-ray imaging of directed energy deposition additive manufacturing of titanium alloy Ti-6242 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.addma.2021.101969 |
| Publisher version: | https://doi.org/10.1016/j.addma.2021.101969 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Directed Energy Deposition, Synchrotron X-ray imaging, Laser Additive Manufacturing, Pore formation |
| 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/10126913 |
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