|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Titanium Technology
||The formation of titanium ultrafine laminar microstructures via additive manufacturing
||Marco Simonelli, Yau Yau Tse , Pere Barriobero-Vila, Richard Hague
|On-Site Speaker (Planned)
The use of titanium alloys in Laser Powder Bed Fusion (L-PBF), one of the most prominent additive manufacturing techniques, has received considerable attention in recent years. In this study we present how the fast solidifications and cooling rates occurring during L-PBF present opportunities to manufacture Ti constitutions rich in β-eutectoid formers (e.g. Fe). In particular, we study the evolution of the microstructure of a novel Ti-6Al-4V-3Fe alloy during L-PBF with operando X-ray diffraction and a suite of microscopy techniques. The decomposition of the resulting metastable microstructure is then presented. Ad-hoc heat treatments are designed from high-temperature microstructural studies via high-temperature EBSD. Ultrafine α+β grain laminar microstructures result from pseudo-spinodal transformations triggered by early Fe partitioning. Such microstructures are associated to exceptional tensile strengths (>1100MPa) and good elongation (>13%). Findings support a new design strategy for advanced titanium alloys for use in L-PBF.
||Additive Manufacturing, Titanium, Phase Transformations