Effect of Heat Treatment on the Microstructure and Mechanical Properties of Additive Manufactured Ti-6.5Al-2Zr-1Mo-1V Alloy

Zhang, Sheng; Zhang, Yuqi; Qi, Jinshun; Zou, Zhiyi; Qian, Yuanhong

Abstract

Ti-6.5Al-2Zr-1Mo-1V (TA15), widely used in the aerospace industry, is a medium- to high-strength, near-α titanium alloy with high aluminium equivalent value. The TA15 fabricated via laser powder bed fusion (L-PBF) normally presents a typical brittle appearance in as-built status, with high strength and low ductility. In this study, the microstructure and properties of L-PBF TA15 were engineered by various heat treatments below the β-transus temperature (1022 °C). After heat treatment, the original acicular martensite gradually transforms into a typical lamellar α + β dual-phase structure. Withannealing temperature increases, the lamellar α phase thickened with a decreased aspect ratio. Globularisation of the α grain can be noticed when annealing above 800 °C, which leads to a balance between strength and ductility. After heat treatment between 800–900 °C, the desired combination of strength and ductility can be achieved, with elongation of about 12.5% and ultimate tensile strength of about 1100 Mpa.

Citation

Zhang, S., Zhang, Y., Qi, J., Zou, Z., & Qian, Y. (2023). Effect of Heat Treatment on the Microstructure and Mechanical Properties of Additive Manufactured Ti-6.5Al-2Zr-1Mo-1V Alloy. Materials, 16(1), Article 160. https://doi.org/10.3390/ma16010160

• Journal Article Type: Article
• Acceptance Date: Dec 20, 2022
• Online Publication Date: Dec 24, 2022
• Publication Date: Jan 1, 2023
• Deposit Date: Mar 1, 2023
• Publicly Available Date: Mar 1, 2023
• Journal: Materials
• Electronic ISSN: 1996-1944
• Publisher: MDPI
• Peer Reviewed: Peer Reviewed
• Volume: 16
• Issue: 1
• Article Number: 160
• DOI: https://doi.org/10.3390/ma16010160
• Keywords: Article, laser powder bed fusion, TA15 alloy, heat treatment, microstructure, mechanical property
• Public URL: https://nottingham-repository.worktribe.com/output/15924760
• Publisher URL: https://www.mdpi.com/1996-1944/16/1/160