| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing Modeling and Simulation: Microstructure, Mechanics, and Process
|
| Presentation Title |
Cellular Automaton Simulation of Three-dimensional Microstructure Evolution during Powder Bed Fusion Additive Manufacturing |
| Author(s) |
Michael P. Moodispaw, Cheng Gu, Alan A. Luo, Qigui Wang |
| On-Site Speaker (Planned) |
Michael P. Moodispaw |
| Abstract Scope |
Solidification microstructures determine the mechanical properties of powder bed fusion (PBF) additive manufacturing (AM) products, but evolution of the microstructure during the AM process is not well understood. A three-dimensional (3-D) cellular automaton (CA) model was developed to predict microstructures of metallic alloys during PBF additive process. In this model, undercooling was considered as the driving force for nucleation and grain growth, but both cooling rate and temperature gradient of the melt pool influenced grain nucleation and growth. Both 3-D and 2-D multi-layer simulations were performed as a comparison, and grain growth was not limited to a 2-D plane in the 3-D simulations. Overlap layers between adjacent layers during AM process were considered in the model. Earlier layers will experience more thermal cycles which will affect the final microstructure in the finished part. The simulation results were compared with PBF experiments of aluminum alloys, showing good agreement. |