About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
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Computational Thermodynamics and Kinetics
|
Presentation Title |
Multiscale Dendritic Needle Network Study of the Effect of Buoyant Liquid Flow on Dendritic Growth Kinetics |
Author(s) |
Thomas Isensee, Damien Tourret |
On-Site Speaker (Planned) |
Thomas Isensee |
Abstract Scope |
The growth of metals and alloys from the liquid is heavily disturbed by gravity-induced buoyant melt flow induced by the rejection of heat and/or solute during solidification. Depending on the direction of growth and that of gravity, hydrodynamically stable or unstable regimes can be established, which lead to steady or oscillatory growth dynamics, and also affect length scale (e.g. dendritic spacings) selection. We use the multiscale Dendritic Needle Network model to investigate dendrite growth dynamics under various gravity conditions, including a hydrodynamically unstable regime resulting in oscillatory dendritic growth velocities. This oscillatory growth behavior was recently observed experimentally during the directional solidification of nickel-based single crystal superalloys [G. Reinhart, et al., Acta Materialia 194 (2020) 68-79]. Our DNN simulations shall unveil the fundamental mechanisms behind these oscillations, pinpoint their specific conditions of occurrence, and therefore help the design of single-crystal either promoting or avoiding such unstable regimes. |
Proceedings Inclusion? |
Planned: |
Keywords |
Solidification, Computational Materials Science & Engineering, Modeling and Simulation |