| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Processing Effects on Microstructure and Material Performance
|
| Presentation Title |
A-94: Dendrite Orientation Transition in Laser Remelted Titanium Alloys: Phase Field Simulation and Experiment Validation |
| Author(s) |
Yujian Wang, Yu Zou |
| On-Site Speaker (Planned) |
Yu Zou |
| Abstract Scope |
Microstructure evolution of titanium alloys during laser-based additive manufacturing process plays a significant role in their final mechanical properties. In this study, we have developed a three-dimensional heat transfer model and a microscale phase field model to illustrate the dendritic growth behaviour during laser remelting process. We find that a large thermal gradient and cooling rate in a local molten pool result in dendrite orientation transition (DOT) – the dendrite arm angle changes from 90° to 45°. We used a 2 W laser to remelt two titanium alloys (Ti-5Al-5Mo-5V-1Cr-1Fe and Ti-6Al-4V) for 2-3 seconds. The grain morphologies after remelting is dependent of laser processing parameters and materials. The simulation results agree well with the experimental observation. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |