Refinement of the grain structure of additive manufactured titanium alloys via epitaxial recrystallization enabled by rapid heat treatment

Zou, Zhiyi; Simonelli, Marco; Katrib, Juliano; Dimitrakis, Georgios; Hague, Richard

Abstract

The coarse prior-β grain structure in titanium alloys produced by additive manufacturing is associated to mechanical anisotropy and limited fatigue life. Here we report a novel methodology to refine such structure by rapid heat treatment of Ti-6Al-4V produced by laser powder-bed fusion. The refinement was analysed using high-temperature EBSD that showed, for the first time, how high angle boundary β grains nucleated and grew with quasi-equiaxed morphology by epitaxial recrystallization. These findings show the potential for such heating regime to be applied to control grain size, morphology and distribution in a wider category of structural alloys produced by additive manufacturing.

Citation

Zou, Z., Simonelli, M., Katrib, J., Dimitrakis, G., & Hague, R. (2020). Refinement of the grain structure of additive manufactured titanium alloys via epitaxial recrystallization enabled by rapid heat treatment. Scripta Materialia, 180, 66-70. https://doi.org/10.1016/j.scriptamat.2020.01.027

• Journal Article Type: Article
• Acceptance Date: Jan 21, 2020
• Online Publication Date: Jan 31, 2020
• Publication Date: Apr 15, 2020
• Deposit Date: Jan 22, 2020
• Publicly Available Date: Feb 5, 2020
• Journal: Scripta Materialia
• Print ISSN: 1359-6462
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 180
• Pages: 66-70
• DOI: https://doi.org/10.1016/j.scriptamat.2020.01.027
• Keywords: Additive manufacturing; Titanium alloys; Epitaxial recrystallization; Rapid heat treatment
• Public URL: https://nottingham-repository.worktribe.com/output/3782086
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S1359646220300439
• Additional Information: This article is maintained by: Elsevier; Article Title: Refinement of the grain structure of additive manufactured titanium alloys via epitaxial recrystallization enabled by rapid heat treatment; Journal Title: Scripta Materialia; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.scriptamat.2020.01.027; Content Type: article; Copyright: © 2020 Acta Materialia Inc. Published by Elsevier Ltd.