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Plastic anisotropy of additively manufactured maraging steel: influence of the build orientation and heat treatments

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Show simple item record Mooney, Barry Kourousis, Kyriakos I. Raghavendra, Ramesh 2019-01-24T16:24:19Z 2019-01-24T16:24:19Z 2019
dc.description peer-reviewed en_US
dc.description.abstract This experimental study investigates the combined effect of the three primary Additive Manufacturing (AM) build orientations (0°, 45°, and 90°) and an extensive array of heat treatment plans on the plastic anisotropy of maraging steel 300 (MS1) fabricated on the EOSINT M280 Direct Metal Laser Sintering (DMLS) system. The alloy's microstructure, hardness, tensile properties and plastic strain behaviour have been examined for various strengthening heat-treatment plans to assess the influence of the time and temperature combinations on plastic anisotropy and mechanical properties (e.g. strength, ductility). A comprehensive visual representation of the material's overall mechanical properties, for all three AM build orientations, against the various heat treatment plans is offered through time – temperature contour maps. Considerable plastic anisotropy has been confirmed in the as-built condition, which can be reduced by aging heat-treatment, as verified in this study. However, it has identified that a degree of transverse strain anisotropy is likely to remain due to the AM alloy's fabrication history, a finding that has not been previously reported in the literature. Moreover, the heat treatment plan (6h at 490 °C) recommended by the DMLS system manufacturer has been found not to be the optimal in terms of achieving high strength, hardness, ductility and low anisotropy for the MS1 material. With the use of the comprehensive experimental data collected and analysed in this study, and presented in the constructed contour maps, the alloy's heat treatment parameters (time, temperature) can be tailored to meet the desired strength/ductility/anisotropy design requirements, either for research or part production purposes. en_US
dc.language.iso eng en_US
dc.publisher Elsevier en_US
dc.relation.ispartofseries Additive Manufacturing;25, pp. 19-31
dc.rights This is the author’s version of a work that was accepted for publication in Additive Manufacturing. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Additivie Manufacturing, 2019, 25, pp. 19-31, en_US
dc.subject additive manufacturing en_US
dc.subject 3D printing en_US
dc.subject maraging steel en_US
dc.subject anisotropy en_US
dc.subject heat treatment en_US
dc.subject strength en_US
dc.subject ductility en_US
dc.title Plastic anisotropy of additively manufactured maraging steel: influence of the build orientation and heat treatments en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.1016/j.addma.2018.10.032
dc.contributor.sponsor IRC en_US
dc.relation.projectid 2020-10-31 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US

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