| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Process-induced Microstructures and Defects
|
| Presentation Title |
Gleeble Dilatometry to Resolve Microstructure Evolution in W-DED Ti-6Al-4V |
| Author(s) |
Christopher Barret Finfrock, Jessica Buckner, Jonathon Pegues, Hannah Sims, Jack Herrmann, Anthony Marcon |
| On-Site Speaker (Planned) |
Christopher Barret Finfrock |
| Abstract Scope |
Wire-based Direct Energy Deposition (W-DED) processes may replace conventional forming methods due to their rapid build rates and ability to produce near-net shapes that minimize post-processing. For this study, two W-DED processes, wire arc additive manufacturing (WAAM) and electron beam additive manufacturing (EBAM), were used to manufacture Ti-6Al-4V. Both builds were subsequently beta annealed and overaged to improve the strength and fracture toughness relative to the as-built material. Despite notionally identical heat treatments, unique microstructures were generated on cooling; the EBAM process formed massive martensite while the WAAM process formed acicular martensite. To elucidate the cause of the microstructure differences, a Gleeble thermomechanical simulator, capable of cooling rates up to 1000°C, was used to perform dilatometry at various cooling rates on the two builds. These data yielded critical insights for controlling microstructure development with post-build heat treatment that can be exploited to tailor mechanical performance in service.
Sandia-National-Laboratories-is-managed-and-operated-by-NTESS-under-DOE-NNSA-contract-DE-NA0003525. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Titanium, Phase Transformations |