Crack path selection at the interface of wrought and wire + arc additive manufactured Ti–6Al–4V

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dc.contributor.authorZhang, Jikui
dc.contributor.authorZhang, Xiang
dc.contributor.authorWang, Xueyuan
dc.contributor.authorDing, Jialuo
dc.contributor.authorTraoré, Yéli
dc.contributor.authorPaddea, Sanjooram
dc.contributor.authorWilliams, Stewart W.
dc.date.accessioned2016-07-19T13:38:17Z
dc.date.available2016-07-19T13:38:17Z
dc.date.issued2016-05-12
dc.description.abstractCrack propagation deviation tendency in specimens containing an interface between wrought alloy substrate and Wire + Arc Additive Manufacture (WAAM) built Ti–6Al–4V is investigated from the viewpoints of microstructure, residual stress and bi-material system. It is found that a crack initiated at the interface tends to grow into the substrate that has equiaxed microstructure and lower resistance to fatigue crack propagation. Experimental observations are interpreted by finite element modelling of the effects of residual stress and mechanical property mismatch between the WAAM and wrought alloy. Residual stresses retained in the compact tension specimens are evaluated based on measured residual stress in the initial WAAM built wall. Cracks perpendicular to the interface kept a straight path owing to the symmetrical residual stress distribution. In this case the tangential stress in bi-material model is also symmetric and has the maximum value at the initial crack plane. In contrast, cracks parallel to the interface are inclined to grow towards the substrate due to the mode II (or sliding mode) stress intensity factor caused by the asymmetric residual stress field. Asymmetric tangential stress in the bi-material model also contributes to the observed crack deviation trend according to the maximum tangential stress criterion.en_UK
dc.identifier.citationJikui Zhang, Xiang Zhang, Xueyuan Wang, Jialuo Ding, Yéli Traoré, Sanjooram Paddea, Stewart Williams, Crack path selection at the interface of wrought and wire + arc additive manufactured Ti–6Al–4V, Materials & Design, Volume 104, 15 August 2016, pp365-375en_UK
dc.identifier.issn0264-1275
dc.identifier.urihttp://dx.doi.org/10.1016/j.matdes.2016.05.027
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/10142
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectAdditive manufacturingen_UK
dc.subjectTitanium alloyen_UK
dc.subjectCrack path selectionen_UK
dc.subjectMicrostructureen_UK
dc.subjectResidual stressen_UK
dc.subjectBi-materialen_UK
dc.subjectFinite element modelen_UK
dc.titleCrack path selection at the interface of wrought and wire + arc additive manufactured Ti–6Al–4Ven_UK
dc.typeArticleen_UK

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