About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
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Symposium
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Purveyors of Processing Science and ICME: A SMD Symposium to Honor the Many Contributions of Taylan Altan, Wei Tsu Wu, Soo-Ik Oh, and Lee Semiatin
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Presentation Title |
The Evolution of Abnormal Grains Structures during Beta Annealing of Ti-64 Wrought Products |
Author(s) |
Nicholas Byres, Pratheek Shanthraj, Benjamin Dod, Jack Donoghue, Alec Davis, Joao Quinta da Fonseca, Philip Prangnell |
On-Site Speaker (Planned) |
Joao Quinta da Fonseca |
Abstract Scope |
Beta annealing of Titanium-6Al-4V (Ti64) forged components with a strong prior cube-related texture distributions, inherited from the deformation step, can lead to abnormal structures in semi-finished products that do not meet qualification requirements.
The mechanisms behind the development of such abnormal grain structures during the beta annealing step are discussed, based on new evidence from in-situ heating experiments with high speed Electron Backscatter Diffraction (EBSD) analysis. These results have also been simulated using the phase field method, based on statistically representative starting texture distributions. This work has highlighted that a combination of factors may be involved, including the requirement for a strong starting matrix texture containing minor embedded highly misoriented grain components, that act as nuclei, and the heterogeneous dissolution of primary alpha grains, which allows such regions to achieve a sufficient size differential to obtain a ‘runaway’ growth advantage over the surrounding microstructure. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |