| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Refractory Metallic Materials
|
| Presentation Title |
Laser Powder Bed Fusion of Niobium and Exploration of Gradient Composites by Local Addition of Nanoparticles |
| Author(s) |
Emre Tekoglu, Alexander O'Brien, Zachery Kutschke , Bethany Lettiere, John Hart, Ju Li |
| On-Site Speaker (Planned) |
Emre Tekoglu |
| Abstract Scope |
Additive manufacturing (AM) can overcome the challenges associated with conventional casting of refractory metals (e.g., niobium, tantalum, or tungsten).In particular, laser powder bed fusion (LPBF) of refractory materials has gained significant attention, yet it remains challenging to optimize LPBF parameters to prevent cracking.First, we present a baseline study of the key parameters that establish crack-free, high-density (>99.9%) LPBF of pure Nb.Pure Nb samples are produced using a commercial LPBF system (EOS M290). Importantly, we find that scanning each layer twice with the same toolpath is important to full densification and crack-free microstructures.Building upon this result, we present a preliminary study of gradient composites whereby nanoparticles–Si, Ti, and Al–are deposited locally onto the powder prior to LPBF.We study the influence of the nanoparticles on the microstructure, hardness, and oxidation resistance of the alloys, and discuss a pathway to incorporate this gradient capability into full-scale components. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, Characterization |