Effect of deposition strategies on fatigue crack growth behaviour of wire+ arc additive manufactured titanium alloy Ti-6Al-4V

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dc.contributor.authorSyed, Abdul Khadar
dc.contributor.authorZhang, Xiang
dc.contributor.authorDavis, Alec E.
dc.contributor.authorKennedy, Jacob R.
dc.contributor.authorMartina, Filomeno
dc.contributor.authorDing, Jialuo
dc.contributor.authorWilliams, Stewart
dc.contributor.authorPrangnell, Philip B.
dc.date.accessioned2021-04-14T13:49:35Z
dc.date.available2021-04-14T13:49:35Z
dc.date.issued2021-04-03
dc.description.abstractThe influence of three deposition strategies on the fatigue crack growth behaviour of Wire + Arc Additive Manufactured (WAAM) Ti–6Al–4V has been investigated in the as-built condition. Test samples were prepared using single pass, parallel pass, and oscillation deposition strategies and tested with cracks propagating parallel and normal to the plane of deposition. Due to the higher local heat input, the oscillation build exhibited a significantly coarser columnar β grain structure as well as a coarser transformation microstructure, compared to the single pass and parallel pass builds, which were very similar. Among the three build methods, the lowest crack growth rates were found with the oscillation build. The crack growth data was found to broadly fall between that of a recrystallized α (mill-annealed) and β annealed wrought material, with the oscillation strategy build behaving more similarly to a β annealed microstructure. The fatigue crack growth rate was lower when cracks were propagated perpendicular to the build layers. For each build strategy, a greater microstructural influence on crack growth rate was found at lower levels of stress intensity factor range (<25 MPa m1/2). However, the anisotropy and scatter in the data was much more significant in the case of the oscillation build. These differences have been attributed to the stronger α microtexture heterogeneity present in the oscillation build, which led to a greater crack deflection and bifurcation, giving rise to lower crack growth rates and a higher sensitivity to the anisotropy caused by the directional β grain structure.en_UK
dc.identifier.citationSyed AK, Zhang X, Davis AE, et al., (2021) Effect of deposition strategies on fatigue crack growth behaviour of wire+ arc additive manufactured titanium alloy Ti-6Al-4V. Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing, Volume 814, May 2021, Article number 141194.en_UK
dc.identifier.issn0921-5093
dc.identifier.urihttps://doi.org/10.1016/j.msea.2021.141194
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/16570
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectTitanium alloysen_UK
dc.subjectCrack deflectionen_UK
dc.subjectFatigue crack growth rateen_UK
dc.subjectWAAMen_UK
dc.subjectAdditive manufacturingen_UK
dc.titleEffect of deposition strategies on fatigue crack growth behaviour of wire+ arc additive manufactured titanium alloy Ti-6Al-4Ven_UK
dc.typeArticleen_UK

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