| About this Abstract |
| Meeting |
2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)
|
| Symposium
|
Physical Modeling
|
| Presentation Title |
A Multi-grid Cellular Automaton Model for Simulating Dendrite Growth and Its Application in Additive Manufacturing |
| Author(s) |
Yefeng Yu, Yan Wentao, Lin Feng |
| On-Site Speaker (Planned) |
Yefeng Yu |
| Abstract Scope |
The dendrite growth in casting and additive manufacturing is rather important and related to the formation of some defects. However, quantitatively simulating the growth of dendrites with arbitrary crystallographic orientations in 3-dimension(3D) is still very challenging. In the present work, we develop a multi-grid Cellular Automaton (CA) model for dendrite growth. In this model, the interfacial area is further discretized into a child grid, on which the decentered octahedron growth algorithm is performed. The model is comprehensively and quantitatively verified by comparing with the prediction of analytical models and a published x-ray imaging observation result, proving that the model is quantitatively and morphologically accurate. After that, with the temperature and velocity data extracted from a finite volume method-based thermal-fluid model, the model firstly succeed in reproducing the melting-pool-scale dendrite growth process of nickel-based superalloy in additive manufacturing process. The simulation results agree well with the experimental observation. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |