| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Model the Initiation of Hot
Cracking during Laser Welding of Al6061 |
| Author(s) |
Guannan Tang, Anthony Rollett |
| On-Site Speaker (Planned) |
Guannan Tang |
| Abstract Scope |
Hot cracking as one of the major defects in additive manufacturing is notoriously present during the printing of commercial Al6061. This study seeks to quantitatively understand the initiation of hot cracking in this process. In this work, we used a coupled approach between a Lattice Boltzmann method and a Cellular Automaton model to simulate the thermal history of the melting process and microstructure of the fusion zone. The evolution of the thermal stress and strain field were calculated based on those simulations, using a fast-Fourier-Transforms based method. Those results together allow us to compute the solidification shrinkage, thermal deformation and liquid back-feed at the scale of grain boundary. By finding positions where solidification shrinkage and thermal deformation exceeds the compensation by liquid back-feed, a hot cracking propensity map of all the grain boundaries can be extracted. Those will give a quantitative identification to the initiation of hot cracking. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Aluminum, Computational Materials Science & Engineering |