| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Solid-State Phase Transformations and Microstructural Evolution
|
| Presentation Title |
In Situ Observation of Phase Evolution in Ti-6Al-4V upon Laser Processing with Synchrotron X-ray Diffraction Analysis |
| Author(s) |
Seunghee Oh, Rachel Lim, Joseph Aroh, Joseph Pauza, Andrew C. Chuang, Benjamin J. Gould, Niranjan Parab, Joel V. Bernier, Tao Sun, Robert M. Suter, Anthony D. Rollett |
| On-Site Speaker (Planned) |
Seunghee Oh |
| Abstract Scope |
Ti-6Al-4V, α+β titanium alloy, is one of the extensively studied alloys for additive manufacturing. For the optimization of the printed Ti-6Al-4V parts, the phase configuration accompanied by the solid-state phase transformation needs to be understood. However, the phase evolution in laser-based manufacturing occurs over milliseconds at any given location. We used a high-speed synchrotron X-ray diffraction system to observe the laser melted region in Ti-6Al-4V during melting and subsequent cooling with high temporal and spatial resolution. Qualitative and quantitative analysis was performed through single-peak fitting that reveals the transient phase evolution in individual grains. From the estimated temperature via thermal expansion, the evolution is related to the predictions of equilibrium thermodynamics. The β phase appears to show recalescence and the lattice parameters of certain α peaks exhibit spatial anisotropy, indicative of residual stress. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Phase Transformations, Characterization |