Microstructure and residual stress evolution during cyclic elastoplastic deformation of AISI316L fabricated via laser powder bed fusion

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dc.contributor.authorBeltrami, Men_AU
dc.contributor.authorPelegatti, Men_AU
dc.contributor.authorMagnan, Men_AU
dc.contributor.authorLanzutti, Aen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorLuzin, Ven_AU
dc.contributor.authorLeoni, Men_AU
dc.contributor.authorDe Bona, Fen_AU
dc.contributor.authorSalvati, Een_AU
dc.date.accessioned2024-12-05T23:48:48Zen_AU
dc.date.available2024-12-05T23:48:48Zen_AU
dc.date.issued2024-04en_AU
dc.date.statistics2024-11-28en_AU
dc.description.abstractIn metal additive manufacturing (MAM), microstructural properties such as texture, residual stresses, and dislocation density have emerged as key factors ruling the resulting mechanical performances. In this study, cylindrical AISI 316L specimens, fabricated with laser powder bed fusion (LPBF), were tested under cyclic elastoplastic (EP) deformation using a constant strain amplitude to highlight the evolution of residual stresses (RS), dislocation density and texture with increasing number of EP cycles, N, across the hardening-softening (H–S) transition stage, in the attempt to find correlations between relevant microstructural parameters and macroscopic properties. The structural and microstructural analysis is carried out through whole powder pattern modeling (WPPM) of neutron diffraction (ND) data and Electron Back-Scattering Diffraction (EBSD) analysis. The H–S transition is found to occur within 7–9 cycles, with RS fading out already after 5 cycles. Across the H–S transition, the trend of the maximum tensile stress correlates closely with the trend of WPPM-calculated total dislocation density, suggesting a major role of dislocations’ characteristics in the evolution of macroscopic mechanical properties. EBSD analysis reveals the rearrangement of geometrically necessary dislocations (GND) into cellular structures, and moderate grain refinement, which are deemed to be responsible for the quick fading of RS in the very early stage of EP loading. ND-based texture analysis reveals a (220) preferential orientation retained throughout the EP tests but with orientation density functions (ODFs) changing non-monotonically with N, suggesting preliminary partial randomization of grains around the deformation axis followed by the recovery of crystallographic anisotropy and more localized ODFs. © 2024 The Authors. Published by Elsevier B.V.en_AU
dc.description.sponsorshipThis work has been supported by the following projects: ‘‘CONCERTO – Multiscale modelling/characterisation and fabrication of nanocomposite ceramics with improved toughness’’ funded by the MUR Progetti di Ricerca di Rilevante Interesse Nazionale (PRIN) Bando 2020, Italy – grant 2020BN5ZW9; “NutShell - NUmerical modelling and opTimisation of SHELL Structures Against Fracture and Fatigue with Experimental Validations” funded by the MUR Progetti di Ricerca di Rilevante Interesse Nazionale (PRIN) Bando 2022, Italy – grant 20229BM9EL. The authors thank Eng. F. Sordetti, for executing the mechanical testing, and Prof. L. Fedrizzi, head of the laboratory of material science and engineering in the Polytechnic Department of Engineering and Architecture (DPIA) of the University of Udine, for the use of the scientific equipment (MTS, GDOES, and SEM + EDXS + EBSD).en_AU
dc.identifier.articlenumber146416en_AU
dc.identifier.citationBeltrami, M., Pelegatti, M., Magnan, M., Lanzutti, A., Avdeev, M., Luzin, V., Leoni, M., De Bona, F., & Salvati, E. (2024). Microstructure and residual stress evolution during cyclic elastoplastic deformation of AISI316L fabricated via laser powder bed fusion. Materials Science and Engineering: A, 898, 146416. doi:10.1016/j.msea.2024.146416en_AU
dc.identifier.issn0921-5093en_AU
dc.identifier.journaltitleMaterials Science and Engineering: Aen_AU
dc.identifier.urihttps://doi.org/10.1016/j.msea.2024.146416en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15796en_AU
dc.identifier.volume898en_AU
dc.languageEnglishen_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectMicrostructureen_AU
dc.subjectEvolutionen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectMetalsen_AU
dc.subjectManufacturingen_AU
dc.subjectPowdersen_AU
dc.subjectStainless steelsen_AU
dc.subjectResidual stressesen_AU
dc.subjectAdditivesen_AU
dc.titleMicrostructure and residual stress evolution during cyclic elastoplastic deformation of AISI316L fabricated via laser powder bed fusionen_AU
dc.typeJournal Articleen_AU
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