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The Effect of γ″ and δ Phase Precipitation on the Mechanical Properties of Inconel 718 Manufactured by Selective Laser Melting: An In Situ Neutron Diffraction and Acoustic Emission Study
Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, Villigen-PSI, 5232, Switzerland (CHE).
Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, Villigen-PSI, 5232, Switzerland (CHE).
Charles University, Faculty of Mathematics and Physics, Prague, 121 16, Czech Republic (CZE); Nuclear Physics Institute of the Czech Academy of Sciences, Řež, 250 68, Czech Republic (CZE).
Research Institutes of Sweden, Lindholmspiren 7 A, Göteborg, 417 56, Sweden.ORCID iD: 0000-0002-6929-3310
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2020 (English)In: JOM: The Member Journal of TMS, ISSN 1047-4838, E-ISSN 1543-1851, Vol. 73, no 1, p. 223-232Article in journal (Refereed) Published
Abstract [en]

The deformation behavior of additively manufactured Alloy 718 in as-built condition and after annealing was studied in situ under tensile loading along the build direction. Pre-characterization by synchrotron X-ray diffraction and electron microscopy revealed a significant amount of γ″ precipitates in the as-built samples, whereas the γ″ phase was entirely consumed and needle-like δ precipitates appeared in the annealed sample. In situ neutron diffraction (ND) and acoustic emission (AE) enabled indirect observation of the role of the precipitates on the mechanical behavior. ND provided information on the load accommodation in the matrix, while AE detected a strong signal from the interaction of dislocations with the δ-phase precipitates during deformation of the annealed samples. The results imply that in the annealed samples the matrix sheds the load to the precipitates, while in the as-built material the matrix bares a significant load. © 2020, The Author(s).

Place, publisher, year, edition, pages
2020. Vol. 73, no 1, p. 223-232
Keywords [en]
Annealing; Deformation; Gamma rays; Mechanical properties; Neutron diffraction; Selective laser melting, Annealed samples; Build direction; Deformation behavior; In-situ neutron diffraction; Interaction of dislocations; Mechanical behavior; Synchrotron x ray diffraction; Tensile loading, Acoustic emission testing
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-16094DOI: 10.1007/s11837-020-04463-3ISI: 000590546500001Scopus ID: 2-s2.0-85096295872OAI: oai:DiVA.org:hv-16094DiVA, id: diva2:1505820
Available from: 2020-12-01 Created: 2020-12-01 Last updated: 2021-02-15Bibliographically approved

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Pederson, Robert

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