Effect of crack-like defects on the fracture behaviour of Wire + Arc additively manufactured nickel-base Alloy 718

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dc.contributor.authorSeow, Cui Er
dc.contributor.authorZhang, Jie
dc.contributor.authorCoules, Harry E.
dc.contributor.authorWu, Guiyi
dc.contributor.authorJones, Christopher A.
dc.contributor.authorDing, Jialuo
dc.contributor.authorWilliams, Stewart W.
dc.date.accessioned2020-10-07T15:04:58Z
dc.date.available2020-10-07T15:04:58Z
dc.date.issued2020-09-11
dc.description.abstractThe fabrication of large components using a high deposition rate, near-net shape process like Wire + Arc Additive Manufacturing (WAAM) is a promising option for many industries, due to the potential for reduction in material wastage and shorter lead times in comparison to conventional methods. Specialist materials like nickel-base superalloys, which are typically used in high temperature and corrosive environments, are particularly attractive options due to their high raw material costs. Although nickel-base Alloy 718 seems well suited to the process due to its good weldability, process-induced defects can arise from unfavourable deposition conditions and elimination of these defects may not always be possible. In WAAM Alloy 718 deposited under such conditions, crack-like defects with planar morphology and hot cracking characteristics were observed. These defects were observable using conventional non-destructive testing techniques and displayed directionality relating to the deposition path. The fracture behaviour of WAAM Alloy 718 containing these defects was “semi-stable” – a mixture of fracture instability and stable crack extension. The apparent fracture toughness of WAAM Alloy 718 containing these defects was found to be anisotropic, which can be attributed to the interaction of the notched crack with pre-existing defects. WAAM Alloy 718 displayed an apparent fracture toughness comparable to that of wrought Alloy 718 when notched perpendicular to the defects; but only half that of wrought when notched parallel to the defects. Therefore, careful consideration of defect orientation and their effects on mechanical properties is important in assessing the fitness-for-service of WAAM Alloy 718en_UK
dc.identifier.citationSeow CE, Zhang J, Coules HE, et al., (2020) Effect of crack-like defects on the fracture behaviour of Wire + Arc additively manufactured nickel-base Alloy 718. Additive Manufacturing, Volume 36, December 2020, Article number 101578en_UK
dc.identifier.issn2214-7810
dc.identifier.urihttps://doi.org/10.1016/j.addma.2020.101578
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/15868
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectfracture toughnessen_UK
dc.subjectnon-destructive testingen_UK
dc.subjectcrack-like defecten_UK
dc.subjectnickel-base superalloyen_UK
dc.subjectwire arc additive manufacturingen_UK
dc.titleEffect of crack-like defects on the fracture behaviour of Wire + Arc additively manufactured nickel-base Alloy 718en_UK
dc.typeArticleen_UK

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