Investigation of process factors affecting mechanical properties of INCONEL 718 superalloy in wire plus arc additive manufacture process

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dc.contributor.authorXu, Xiangfang
dc.contributor.authorDing, Jialuo
dc.contributor.authorGanguly, Supriyo
dc.contributor.authorWilliams, Stewart W.
dc.date.accessioned2020-01-23T11:42:40Z
dc.date.available2020-01-23T11:42:40Z
dc.date.issued2018-10-25
dc.description.abstractThis paper systematically evaluated the effect of oxide, wire source and heat treatment on the mechanical properties of wire + arc additively manufactured (WAAM) INCONEL 718. Comparison of the as deposited grain structure was made with laser-powder based AM and wrought INCONEL 718. Results showed that oxides formed during deposition had no effect on the mechanical properties since a 0.5μm thick passivation layer consisting of Cr2O3 and Al2O3 formed upon deposition and prevented further oxides from forming inside the bulk. Wires from different suppliers resulted in around 50 MPa difference in UTS possibly due to the slight compositional variation and uncertainties in TiN inclusion. Standard heat treatment improved the strength from 824 MPa to 1110 MPa in the horizontal direction, but the average strength was 105 MPa lower than the wrought alloy. The as deposited WAAM INCONEL718 featured large columnar grains and numerous Laves phase, as compared to the fine grains of laser powder bed fusion and wrought INCONEL 718. This starting microstructure led to less favourable and less numerous precipitates forming during heat treatment, which is the main reason for the strength mismatch. A different heat treatment would not help due to the starting microstructure.en_UK
dc.identifier.citationXu X, Ding J, Ganguly S, Williams S. (2019) Investigation of process factors affecting mechanical properties of INCONEL 718 superalloy in wire plus arc additive manufacture process. Journal of Materials Processing Technology, Volume 265, March 2019, pp. 201-209en_UK
dc.identifier.issn0924-0136
dc.identifier.urihttps://doi.org/10.1016/j.jmatprotec.2018.10.023
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/15002
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.subjectINCONEL 718en_UK
dc.subjectWire plus arc additive manufactureen_UK
dc.subjectMechanical propertiesen_UK
dc.subjectHeat treatmenten_UK
dc.subjectOxideen_UK
dc.titleInvestigation of process factors affecting mechanical properties of INCONEL 718 superalloy in wire plus arc additive manufacture processen_UK
dc.typeArticleen_UK

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