| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Powder Materials Processing and Fundamental Understanding
|
| Presentation Title |
Surface Chemistry Changes Resulting from Ti-6Al-4V Feedstock Powder Reuse in Electron Beam Additive Manufacturing |
| Author(s) |
Nicholas A. Derimow, Justin M. Gorham, May L. Martin, Jake T. Benzing, Ryan M. White, Nikolas Hrabe |
| On-Site Speaker (Planned) |
Nicholas A. Derimow |
| Abstract Scope |
X-ray photoelectron spectroscopy (XPS) and electron microscopy (SEM/TEM/STEM) was carried out on Ti-6Al-4V powders used in electron beam powder-bed fusion (EB-PBF) production environments. The two objectives were to (1) investigate high oxygen containing Grade 23 Ti-6Al-4V powders which were further oxidized as a function of reuse and (2) comparing reused Grade 23 and virgin Grade 5 powders of similar oxygen content. The microstructure of the virgin Grade 23 powder was consistent with martensitic microstructure, whereas the reused powder displayed tempered Widmanstatten microstructure. XPS revealed a decrease in TiO2 at the surface of the reused powders with an increase in Al2O3. This trend is energetically favorable at the temperatures and pressures in EB-PBF machines. An unexpected amount of nitrogen was measured, with a general increase in nitride on the surface of the particles with increased reuse of the Ti-6Al-4V powder. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Powder Materials, Titanium |