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On the relationship between laser scan strategy, texture variations and hidden nucleation sites for failure in laser powder-bed fusion
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.ORCID iD: 0000-0001-8500-1632
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.ORCID iD: 0000-0003-2764-0545
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.ORCID iD: 0000-0002-5511-5986
Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA..
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2022 (English)In: Materialia, E-ISSN 2589-1529, Vol. 26, article id 101614Article in journal (Refereed) Published
Abstract [en]

While laser powder-bed fusion has overcome some of the design constraints of conventional manufacturing meth-ods, it requires careful selection of process parameters and scan strategies to obtain favorable properties. Here we show that even simple scan strategies, complex ones being inevitable when printing intricate designs, can inadvertently produce local alterations of the microstructure and preferential grain orientation over small areas - which easily remain unnoticed across the macroscale. We describe how a combined usage of neutron imaging and electron backscatter diffraction can reveal these localized variations and explain their origin within cm-sized parts. We explain the observed contrast variations by linking the neutron images to simulated data, pole figures and EBSD, providing an invaluable reference for future studies and showing that presumably minor changes of the scan strategy can have detrimental effects on the mechanical properties. In-situ tensile tests reveal that fracture occurs in a region that was re-melted during the building process.

Place, publisher, year, edition, pages
Elsevier, 2022. Vol. 26, article id 101614
Keywords [en]
Laser powder-bed fusion, Texture, Preferential orientation, Diffraction contrast neutron imaging, Bragg-edge, Inhomogeneous microstructure, Texture control
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-493001DOI: 10.1016/j.mtla.2022.101614ISI: 000892608600011OAI: oai:DiVA.org:uu-493001DiVA, id: diva2:1726324
Funder
Swedish Foundation for Strategic ResearchSwedish Foundation for Strategic ResearchSwedish Foundation for Strategic ResearchAvailable from: 2023-01-12 Created: 2023-01-12 Last updated: 2023-01-12Bibliographically approved

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Pacheco, VictorMarattukalam, Jithin JamesKarlsson, DennisSahlberg, Martin

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