| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Refractory Metallic Materials
|
| Presentation Title |
ICME Analysis Microcracking of Tungsten in Rapid Solidification |
| Author(s) |
Tatu Pinomaa, Jukka Aho, Matias Haapalehto, Joni Kaipainen, Sicong Ren, Paul Jreidini, Joseph T. McKeown, Jesper Byggmästar, Kai Nordlund, Nikolas Provatas, Anssi Laukkanen |
| On-Site Speaker (Planned) |
Tatu Pinomaa |
| Abstract Scope |
Tungsten is used as a plasma facing material for fusion reactors due to its high melting point, thermal conductivity, and low fuel retention. While additive manufacturing is a promising method to produce tungsten parts, it tends to produce microcracks. We perform a multiscale modeling analysis to explore the rapid solidification features of pure tungsten and certain tungsten-based binary alloys. We use a gaussian approximation potential MD and phase field crystal to analyze rapid solidification defects, including point defects, dislocations, crystal orientation gradients, and potential microcavities. On continuum scale, we perform coupled phase field and crystal plasticity simulations to investigate microstructural (type II-III) residual stresses due to solidification shrinkage, and due to solid-state thermal contraction during cool-down. The simulation results are compared to bare plate single line scans. We discuss the role of ductile-to-brittle transition and oxide inclusions as sources of microcracking, and the effect of selected alloying elements on microcracking. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
ICME, High-Temperature Materials, Solidification |