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Influence of Scanning Strategy on Residual Stresses in Laser-Based Powder Bed Fusion Manufactured Alloy 718: Modeling and Experiments
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science and Engineering, Applied Material Science.
Luleå Univ Technol, Dept Engn Sci & Math, SE-97187 Luleå, Sweden..ORCID iD: 0000-0002-2592-9073
Luleå Univ Technol, Dept Engn Sci & Math, SE-97187 Luleå, Sweden..ORCID iD: 0000-0002-4638-9491
Malmö Univ, Dept Mat Sci & Appl Math, SE-20506 Malmö, Sweden..ORCID iD: 0000-0003-3454-2660
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2024 (English)In: Materials, E-ISSN 1996-1944, Vol. 17, no 24, article id 6265Article in journal (Refereed) Published
Abstract [en]

In additive manufacturing, the presence of residual stresses in produced parts is a well-recognized phenomenon. These residual stresses not only elevate the risk of crack formation but also impose limitations on in-service performance. Moreover, it can distort printed parts if released, or in the worst case even cause a build to fail due to collision with the powder scraper. This study introduces a thermo-mechanical finite element model designed to predict the impact of various scanning strategies in order to mitigate the aforementioned unwanted outcomes. The investigation focuses on the deformation and residual stresses of two geometries manufactured by laser-based powder bed fusion (PBF-LB). To account for relaxation effects during the process, a mechanism-based material model has been implemented and used. Additionally, a purely mechanical model, based on the inherent strain method, has been calibrated to account for different scanning strategies. To assess the predicted residual stresses, high-energy synchrotron measurements have been used to obtain values for comparison. The predictions of the models are evaluated, and their accuracy is discussed in terms of the physical aspects of the PBF-LB process. Both the thermo-mechanical models and the inherent strain method capture the trend of experimentally measured residual stress fields. While deformations are also adequately captured, there is an overall underprediction of their magnitude. This work contributes to advancing our understanding of the thermo-mechanical behavior in PBF-LB and provides valuable insights for optimizing scanning strategies in additive manufacturing processes.

Place, publisher, year, edition, pages
MDPI, 2024. Vol. 17, no 24, article id 6265
Keywords [en]
PBF-LB, LPBF, EBSD, synchrotron diffraction, finite element method, mechanism-based material model, inherent strain, validation
National Category
Applied Mechanics Manufacturing, Surface and Joining Technology Metallurgy and Metallic Materials Other Materials Engineering
Identifiers
URN: urn:nbn:se:uu:diva-555060DOI: 10.3390/ma17246265ISI: 001384686300001PubMedID: 39769864Scopus ID: 2-s2.0-85213293326OAI: oai:DiVA.org:uu-555060DiVA, id: diva2:1953803
Funder
Swedish Foundation for Strategic ResearchVinnova, 2023-01937VinnovaAvailable from: 2025-04-23 Created: 2025-04-23 Last updated: 2025-04-23Bibliographically approved

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Hassila, Carl JohanMalmelov, AndreasAndersson, CarlHektor, JohanFisk, MartinLundback, AndreasWiklund, Urban
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