Description
Wire-arc directed energy deposition (waDED) of Ti-alloys via the cold metal transfer (CMT) technique with a novel welding characteristic offers significant cost reduction with higher production rates for 3D printing of large-scale structures. However, additive manufacturing (AM) processes with high-speed deposition rates involve complex thermo-mechanical profiles that promote heterogeneous microstructures and anisotropic mechanical properties.This work seeks to comprehensively understand the microstructure evolution during CMT of the Ti-6Al-4V alloy and its capability to address material processing challenges. The deposition conditions enable the reduction of epitaxial growth of the β-phase. Further, the unique thermal profile of the process refines both α- and β-phase microstructures and promotes the partitioning of alloying elements. Microstructure refinement unlocks more isotropic mechanical response when compared to other AM techniques. Tensile testing reveals high mechanical strength with moderate ductility. The latter can be positively influenced via heat treatments. Fatigue properties in different orientations of the builds evidence high endurance limits close to wrought material conditions. Presented findings showcase the potential of CMT to become a preferred processing route for manufacturing large-scale engineering Ti parts.
| Period | 9 May 2024 |
|---|---|
| Event title | Titanium Europe |
| Event type | Conference |
| Location | Dublin, IrelandShow on map |
| Degree of Recognition | International |
Research Field
- Wire-Based Additive Manufacturing