About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Additive Manufacturing of Metals: Applications of Solidification Fundamentals
|
Presentation Title |
Phase Transformation Pathways and Solute Behaviour at Boundaries in Ti-6Al-4V Manufactured via Electron Beam Powder Bed Fusion |
Author(s) |
William Davids, Andrew Breen, Simon P Ringer |
On-Site Speaker (Planned) |
Andrew Breen |
Abstract Scope |
Additively manufacturing Ti-6Al-4V involves a complex combination of phase transformations, leading to microstructural, property and solute heterogeneity within a single as-fabricated build. Here, we study (i) the phase transformation pathway specific to Ti-6Al-4V manufactured via electron beam-powder bed fusion, and (ii) its implication on the solute distribution at all unique Burgers orientation relationship boundaries. We reveal that the high-temperature β phase can be separated into two categories, depending on whether it was retained from cooling from above the β transus temperature, or nucleated below it. This insight was enabled via the development of novel post-processing techniques. We use correlative transmission Kikuchi diffraction and atom probe tomography to show the heterogeneous nature of V, Fe and Al across the interface plane, and quantify their interfacial excess w.r.t misorientation across each unique boundary type. While this study concerns E-PBF Ti-6Al-4V, it is a first for the alloy in general. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Titanium, Phase Transformations |