Huseyin Hizli
Microstructural evolution in laser melted boron alloyed Ti-6Al-4V
Hizli, Huseyin; Zou, Zhiyi; Murray, James; Clare, Adam; Simonelli, Marco
Authors
Dr Zhiyi Zou ZHIYI.ZOU2@NOTTINGHAM.AC.UK
RESEARCH FELLOW
James Murray
Professor ADAM CLARE adam.clare@nottingham.ac.uk
PROFESSOR OF MANUFACTURING ENGINEERING
Dr MARCO SIMONELLI MARCO.SIMONELLI@NOTTINGHAM.AC.UK
ASSOCIATE PROFESSOR
Abstract
Grain refinement in cast titanium alloys has been demonstrated through the addition of boron (B) in hypoeutectic concentration. However, there is still a poor understanding of how effective B is towards microstructural refinement under rapid solidification conditions. This study investigates the impact of boron (B) addition on the microstructure formation in Ti-6Al-4 V alloys under rapid solidification conditions, particularly relevant to Laser Powder Bed Fusion (PBF-LB), a leading technique in metal additive manufacturing. By examining a range of Ti-6Al-4 V-xB alloys with boron contents varying from 0 wt% to 2.5 wt%, prepared through arc melting and subsequent laser surface melting to mimic PBF-LB conditions, our empirical analysis focuses on identifying the threshold B concentration for effective in-situ grain refinement in these alloys. Results indicate that a boron concentration of 0.2 wt% or higher significantly refines the microstructure of Ti-6Al-4 V alloy, leading to the formation of a quasi-continuous TiB network. Crucially, our comprehensive analysis across all samples reveals a consistent microstructural composition, characterized by the presence of martensitic alpha and titanium boride (TiB) phases, with an absence of the beta-titanium (β-Ti) phase. This underlines the significant role of boron in stabilizing these specific phases, thus contributing to our understanding of phase formation dynamics in boron-modified Ti-6Al-4 V alloys under rapid solidification conditions.
Citation
Hizli, H., Zou, Z., Murray, J., Clare, A., & Simonelli, M. (2024). Microstructural evolution in laser melted boron alloyed Ti-6Al-4V. Journal of Alloys and Compounds, 981, Article 173762
| Journal Article Type | Article |
|---|---|
| Acceptance Date | Feb 1, 2024 |
| Online Publication Date | Feb 5, 2024 |
| Publication Date | Apr 25, 2024 |
| Deposit Date | Feb 19, 2024 |
| Publicly Available Date | Feb 19, 2024 |
| Journal | Journal of Alloys and Compounds |
| Print ISSN | 0925-8388 |
| Electronic ISSN | 1873-4669 |
| Publisher | Elsevier |
| Peer Reviewed | Peer Reviewed |
| Volume | 981 |
| Article Number | 173762 |
| Keywords | Titanium alloys; In-situ synthesis TiB; Microstructural evolution; Alloy design; Additive manufacturing; In-situ grain refinement |
| Public URL | https://nottingham-repository.worktribe.com/output/31606395 |
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Publisher Licence URL
https://creativecommons.org/licenses/by/4.0/
Copyright Statement
© 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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