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Microstructure control by heat treatment for better ductility and toughness of Ti-6Al-4V produced by laser powder bed fusion.
- Source :
-
Australian Journal of Mechanical Engineering . Dec 2021, Vol. 19 Issue 5, p680-691. 12p. - Publication Year :
- 2021
-
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]
Details
- Language :
- English
- ISSN :
- 14484846
- Volume :
- 19
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Australian Journal of Mechanical Engineering
- Publication Type :
- Academic Journal
- Accession number :
- 155083582
- Full Text :
- https://doi.org/10.1080/14484846.2021.2004654