Description
The advent of cold metal transfer (CMT)-based wire-arc directed energy deposition (waDED) has established an efficient, high-speed additive manufacturing (AM) method, ideal for making Ti6Al4V components with high productivity and low costs. Nevertheless, heterogeneous microstructures and anisotropic properties in the final as-deposited state severely hinder the large-scale industrial implementation of this technology. This research focuses on overcoming these challenges through comprehensive analysis of the microstructure and mechanical behaviour in CMT produced Ti6Al4V builds. We show that CMT can achieve grain refinement and effectively reduce columnar grain formation, thereby promoting isotropic mechanical properties. The resulting microstructure after fabrication is highly influenced by grain boundary α (GBα) variant selection, leading to coarse, similarly oriented α-colony structures. Studying the deformation characteristics of tensile tested samples extracted from the fabricated build, reveals a heterogeneous deformation distribution developed during tensile testing. This is correlated with the presence of GBα, heat affected zone (HAZ ) banding, regions consisting of soft and hard basketweave α-laths within distinct parent β-grains. The findings highlight how GBα variant selection and microstructure heterogeneity during CMT influence the deformation mechanisms in Ti6Al4V. This offers new insights required for tailoring microstructures and optimising mechanical performance in Ti6Al4V alloy parts processed with CMT.| Period | 4 Dec 2024 → 6 Dec 2024 |
|---|---|
| Event title | CAMS2024 - Advancing Materials and Manufacturing |
| Event type | Conference |
| Location | Adelaide, Australia, South AustraliaShow on map |
| Degree of Recognition | International |
Research Field
- Wire-Based Additive Manufacturing