Optimising the mechanical properties of Ti-6Al-4V components produced by wire arc additive manufacturing with post-process heat treatments

M J Bermingham; L Nicastro; Damon Kent; Y Chen; M S Dargusch

doi:10.1016/j.jallcom.2018.04.158

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Optimising the mechanical properties of Ti-6Al-4V components produced by wire arc additive manufacturing with post-process heat treatments

Journal article

Open access

Peer reviewed

Optimising the mechanical properties of Ti-6Al-4V components produced by wire arc additive manufacturing with post-process heat treatments

M J Bermingham, L Nicastro, Damon Kent, Y Chen and M S Dargusch

Journal of Alloys and Compounds, Vol.753, pp.247-255

2018

DOI: https://doi.org/10.1016/j.jallcom.2018.04.158

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Abstract

metals and alloys

liquid-solid reactions

mechanical properties

microstructure

Wire Arc Additive Manufacturing (WAAM) is a promising manufacturing process for producing large aerospace components. Based on welding technology, the process is highly affordable, has a very high deposition rate and is not limited by chamber size. Ti-6Al-4V is a promising candidate material for this technology given that it is extensively used in aerospace applications and some large, high buy-fly ratio components can be more efficiently produced by WAAM than via the conventional machining from billet approach. There is currently limited knowledge about whether additional post processes including heat treatments and hot isostatic pressing are necessary to unlock the optimal mechanical properties of Ti-6Al-4V components produced by WAAM. This work explores a range of different post process treatments and the effects on the microstructure and tensile properties of Ti-6Al-4V components produced by WAAM. The relatively slow cooling rate (10-20Ks-1) during the β-α transformation produced Widmanstätten-α and offered an optimal balance between strength and ductility. Hot Isostatic Pressing removed gas porosity but was not effective in improving strength or ductility. Residual tensile stresses in as-built components severely impair ductility and should be removed through stress relief treatments.

Details

Title: Optimising the mechanical properties of Ti-6Al-4V components produced by wire arc additive manufacturing with post-process heat treatments
Authors: M J Bermingham (Author) - University of Queensland
L Nicastro (Author) - University of Queensland
Damon Kent (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Y Chen (Author) - University of Manchester, United Kingdom
M S Dargusch (Author) - University of Queensland
Publication details: Journal of Alloys and Compounds, Vol.753, pp.247-255
Publisher: Elsevier BV
Date published: 2018
DOI: 10.1016/j.jallcom.2018.04.158
ISSN: 0925-8388
Grants: ARC Research Hub for Advanced Manufacturing of Medical Devices, IH150100024, Australian Research Council (Australia, Canberra) - ARC
Grant note: DE160100260 and IH130100008 / Australian Research Council.
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 99450999202621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering

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