Journal article
High stability and high strength β-titanium alloys for additive manufacturing
Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing, Vol.816, pp.1-7
2021
Abstract
Metastable β-Ti alloys are attractive for additive manufacturing as they offer high strength and toughness, with the ability to readily tailor properties through control of the phase fraction and morphology of precipitate phases. However, during additive manufacturing processes thermal cycling associated with repetitive layer-by-layer deposition can potentially promote unintended β-phase decomposition and in-situ precipitation of other phases. This work investigates the stability of the β-phase during high heat input (1648 J/mm) Wire Arc Additive Manufacturing (WAAM) of Ti–3Al–8V–6Cr–4Mo–4Zr (Beta-C). Thermocouples and pyrometers to first used to measure the thermal environment during WAAM, and SEM, XRD and TEM characterisation techniques are used to investigate the microstructure of the as-built alloy. Despite observing large thermal excursions during WAAM well above the temperatures necessary to precipitate α-phase, no evidence of β-phase decomposition was found during WAAM. A Time-Temperature-Transformation (TTT) diagram is used to show that the cooling rates are too fast and the cumulative thermal exposures are too short to decompose the β-phase during WAAM. Consequently, the alloy retains the bcc β-phase which gives the alloy moderate strength (tensile strength ~748 MPa) and good ductility (~20%) during WAAM.
Details
- Title
- High stability and high strength β-titanium alloys for additive manufacturing
- Authors
- C H Ng (Author) - University of QueenslandM J Bermingham (Author) - University of QueenslandD Kent (Author) - University of the Sunshine Coast, Queensland, School of Science, Technology and EngineeringM S Dargusch (Author) - University of Queensland
- Publication details
- Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing, Vol.816, pp.1-7
- Publisher
- Elsevier BV
- DOI
- 10.1016/j.msea.2021.141326
- ISSN
- 1873-4936
- Organisation Unit
- School of Science, Technology and Engineering; University of the Sunshine Coast, Queensland
- Language
- English
- Record Identifier
- 99526507602621
- Output Type
- Journal article
Metrics
33 Record Views
InCites Highlights
These are selected metrics from InCites Benchmarking & Analytics tool, related to this output
- Collaboration types
- Domestic collaboration
- Web Of Science research areas
- Materials Science, Multidisciplinary
- Metallurgy & Metallurgical Engineering
- Nanoscience & Nanotechnology
UN Sustainable Development Goals (SDGs)
This output has contributed to the advancement of the following goals:
Source: InCites