Microstructure and tensile properties of additive manufactured Ti-6Al-4V with refined prior-β grain structure obtained by rapid heat treatment

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

Abstract

Heat treatments tailored for additive manufactured Ti-6Al-4V can be used to attain desirable microstructures associated with superior mechanical properties. Rapid heat treatments, for example, can be used to recrystallise the microstructure of laser powder bed fusion (L-PBF) Ti-6Al-4V to obtain refined and quasi-equiaxed prior-β grains. In this study, we discuss the interplay between refined microstructures and the tensile properties of Ti-6Al-4V specimens. The influence of individual microstructural constituents on the tensile properties are examined in detail and directly compared to those found in specimens subject to conventional annealing treatments. It was found that rapid heat treatments into the β phase field can significantly refine the size of the prior-β grains found in as-built L-PBF Ti-6Al-4V, as well as alter the size and morphological arrangement of the resulting α laths. The proposed new heat treatments are clearly shown to have strengthened the alloy with no apparent detriment to the ductility of the material.

Citation

Zou, Z., Simonelli, M., Katrib, J., Dimitrakis, G., & Hague, R. (2021). Microstructure and tensile properties of additive manufactured Ti-6Al-4V with refined prior-β grain structure obtained by rapid heat treatment. Materials Science and Engineering: A, 814, Article 141271. https://doi.org/10.1016/j.msea.2021.141271

• Journal Article Type: Article
• Acceptance Date: Apr 10, 2021
• Online Publication Date: Apr 14, 2021
• Publication Date: May 13, 2021
• Deposit Date: Apr 20, 2021
• Publicly Available Date: Apr 15, 2022
• Journal: Materials Science and Engineering: A
• Print ISSN: 0921-5093
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 814
• Article Number: 141271
• DOI: https://doi.org/10.1016/j.msea.2021.141271
• Keywords: Mechanical Engineering; General Materials Science; Mechanics of Materials; Condensed Matter Physics
• Public URL: https://nottingham-repository.worktribe.com/output/5470087
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0921509321005402