Wire + Arc Additively Manufactured Inconel 718: Effect of post-deposition heat treatments on microstructure and tensile properties

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dc.contributor.authorSeow, Cui Er
dc.contributor.authorCoules, Harry E.
dc.contributor.authorWu, Guiyi
dc.contributor.authorKhan, Raja H.U.
dc.contributor.authorXu, Xiangfang
dc.contributor.authorWilliams, Stewart W.
dc.date.accessioned2020-01-15T16:05:25Z
dc.date.available2020-01-15T16:05:25Z
dc.date.issued2019-08-24
dc.description.abstractWire + Arc Additive Manufacturing (WAAM) can be used to create large free-form components out of specialist materials such as nickel-base superalloys. Inconel (IN) 718 is well suited for the WAAM process due to its excellent weldability. However, during deposition, WAAM IN718 is susceptible to micro-segregation, leading to undesirable Laves phase formation in the interdendritic regions. Further, the WAAM process encourages columnar grain growth and the development of a strong fibre texture, leading to anisotropy in grain structure. This unfavourable microstructure can be addressed through specialised post-deposition homogenisation heat treatments. A new modified heat treatment was found to be effective in dissolving Laves phase, whereas a standard treatment precipitated δ phase. Tensile test results revealed that Laves and δ phases lead to low ductility when present in a precipitation-hardened matrix. The modified heat treatment also reduced the anisotropy in grain structure, leading to almost isotropic elevated temperature tensile properties, which meet minimum specifications for conventional cast but not for wrought material. Specialised post-deposition heat treatments, which address the unique microstructure of WAAM IN718, are crucial to achieving optimal mechanical properties.en_UK
dc.identifier.citationSeow CE, Coules HE, Wu G, et al.., (2019) Wire + Arc Additively Manufactured Inconel 718: Effect of post-deposition heat treatments on microstructure and tensile properties. Materials and Design, Volume 183, December 2019, Article number 108157en_UK
dc.identifier.issn0264-1275
dc.identifier.urihttps://doi.org/10.1016/j.matdes.2019.108157
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/14927
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectAdditive manufacturingen_UK
dc.subjectMicrostructureen_UK
dc.subjectNickel-base superalloyen_UK
dc.subjectElevated temperatureen_UK
dc.subjectHeat treatmenten_UK
dc.subjectTensile propertiesen_UK
dc.titleWire + Arc Additively Manufactured Inconel 718: Effect of post-deposition heat treatments on microstructure and tensile propertiesen_UK
dc.typeArticleen_UK

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