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Fatigue strength improvement of additively manufactured 316L stainless steel with high porosity through preloading
KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Vehicle Engineering and Solid Mechanics, Solid Mechanics.ORCID iD: 0000-0002-1248-110X
KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Vehicle Engineering and Solid Mechanics, Solid Mechanics.ORCID iD: 0000-0001-8068-2360
KTH, School of Industrial Engineering and Management (ITM), Production engineering, Manufacturing and Metrology Systems.ORCID iD: 0000-0003-4120-4790
KTH, School of Industrial Engineering and Management (ITM), Production engineering, Manufacturing and Metrology Systems.ORCID iD: 0000-0002-2582-9910
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2024 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, Vol. 180, article id 108077Article in journal (Refereed) Published
Abstract [en]

This work investigates the influence of a single tensile preload, applied prior to fatigue testing, on the fatigue strength of 316L stainless steel parts manufactured using laser-based powder bed fusion (PBF-LB) with a porosity of up to 4 %. The specimens were produced in both the horizontal and vertical build directions and were optionally preloaded to 85 % and 110 % of the yield strength before conducting the fatigue tests. The results indicate a clear tendency of improved fatigue life and fatigue limit with increasing overload in both cases. The fatigue limits increased by 25.8 % and 24.6 % for the horizontally and vertically built specimens, respectively. Extensive modelling and experiments confirmed that there was no significant alteration in the shape and size of the porosity before and after preloading. Therefore, the observed enhancement in fatigue performance was primarily attributed to the imposed local compressive residual stresses around the defects.

Place, publisher, year, edition, pages
Elsevier BV , 2024. Vol. 180, article id 108077
Keywords [en]
316L stainless steel, Defects, Fatigue strength, Overload, PBF-LB, Porosity, Preload
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-342189DOI: 10.1016/j.ijfatigue.2023.108077ISI: 001174246000001Scopus ID: 2-s2.0-85181121906OAI: oai:DiVA.org:kth-342189DiVA, id: diva2:1827919
Note

QC 20240503

Available from: 2024-01-15 Created: 2024-01-15 Last updated: 2024-05-03Bibliographically approved

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Subasic, MustafaOlsson, MårtenDadbakhsh, SasanZhao, XiaoyuMansour, Rami

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