1. Microstructure control by heat treatment for better ductility and toughness of Ti-6Al-4V produced by laser powder bed fusion.
- Author
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Zhang, Kun, Kan, Wen Hao, Liu, Yang, Gao, Xiang, Zhu, Yuman, Lim, Samuel Chao Voon, Peng, Huizhi, and Huang, Aijun
- Subjects
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HEATING control , *TITANIUM powder , *DUCTILITY , *MICROSTRUCTURE , *POWDERS , *LASERS , *TENSILE strength - Abstract
In this work, the effects of post-LPBF (laser powder bed fusion) heat treatments on microstructure evolution, tensile and Charpy properties of Ti-6Al-4V have been investigated. The results show that the original martensitic microstructure in the LPBF sample has converted to a lamellae mixture of α and β phases when post heat-treatment temperatures are below the β-transus (800°C, 850°C and 900°C) with air cooling. On this basis, a good balance of tensile strength and ductility was obtained from sample post heated at 800°C for 6 h followed by air-cooling, with an increase of ~42% in ductility and a significant toughness enhancement (almost 100% increase) compared to the as-built sample. The relationship betweenα lamellaethickness, β volume fraction and post-LPBF heat treatment has been established. Both α lamellae thickness and β volume fraction increase with the heat-treatment temperature. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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