| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing Modeling and Simulation: Microstructure, Mechanics, and Process
|
| 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 Al6061. This study seeks to quantitatively understand the initiation of hot cracking in this process. In this work, we used a coupled approach between the Lattice Boltzmann method and Cellular Automaton 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 effect at the scale of grain boundary. By finding positions with values of solidification shrinkage and thermal deformation larger than the value for liquid back-feed, a hot cracking propensity map of all the grain boundaries can be extracted, which will give a quantitative identification to the initiation of hot cracking. |