About this Abstract |
Meeting |
Advances in Welding and Additive Manufacturing Research 2022
|
Symposium
|
Advances in Welding and Additive Manufacturing Research 2022
|
Presentation Title |
The Investigation of Microstructure of Aluminum Alloy in Molten Pool during Laser Welding by Phase Field Model |
Author(s) |
Yuewei Ai, Yachao Yan, Guangyu Dong, Jie Mei |
On-Site Speaker (Planned) |
Yachao Yan |
Abstract Scope |
The mechanical properties and service performance of the welded components are determined by the microstructure of weld in the aluminum alloy laser welding. The microstructure of the weld formed in the solidification process of the molten pool is seriously affected by the temperature field. In this paper, a phase field model coupled with the dynamic solidification of the molten pool is established to quantitatively simulate the evolution process of the microstructure in the molten pool during the laser welding of 6061 aluminum alloy. The effects of laser welding power and welding speed on the solidification microstructure of the welding pool were studied by numerical simulation. The calculated results show that with the increase of the cooling rate in the mushy zone of the molten pool, the growth rate of the columnar crystals increases, and the primary dendrite arm spacing of the columnar dendrites decreases. Within a certain range, the increase of welding power and welding speed leads to an increase in the cooling rate of the mushy zone of the molten pool, which reduces the primary dendrite arm spacing of columnar dendrites in the weld and improves the mechanical properties of the weld. The simulation results are consistent with the literature and experimental observations. The proposed phase field model can be used to predict the microstructure of laser welding welds and the mechanical properties of welds. |
Proceedings Inclusion? |
Undecided |