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Fatigue fracture characterization of chemically post-processed electron beam powder bed fusion Ti-6Al-4V
Luleå University of Technology, Department of Engineering Sciences and Mathematics,Luleå (SWE).ORCID iD: 0000-0003-3828-2149
Luleå University of Technology, Department of Engineering Sciences and Mathematics,Luleå (SWE).ORCID iD: 0000-0001-5921-1935
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (KAMPT)ORCID iD: 0000-0001-7991-6369
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Luleå (SWE).
2023 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, Vol. 172, article id 107673Article in journal (Refereed) Published
Abstract [en]

The fatigue behavior of additively manufactured (AM) structural parts is sensitive to the surface and near-surface material conditions. Chemical post-processing surface treatments can be used to improve the surface condition of AM components, including complex geometries with surfaces difficult to access. In this work, surfaces of electron beam powder bed fusion (EB-PBF) produced Ti–6Al–4V were subject to two different chemical post-processing surface treatments, chemical milling and Hirtisation. As-built and machined surfaces, as well as hot isostatic pressing (HIP), treated conditions were also investigated. Fatigue testing was carried out in four-point bending. The investigation focused on the relationship between fracture mechanisms and fatigue life through fractographic study. It was found that a majority of fractures were initiated at internal surface-near defects or defects on the surface. Chemical post-processing was found to smoothen the surface but to leave a surface waviness. Material removal during post-processing could open up internal defects to the treated surface. In HIP-treated specimens, fractures initiated at defects open to the surface. Despite post-processing increasing the mean life of fatigue specimens, no significant improvements in the lowest tested life were observed for any specimen condition.

Place, publisher, year, edition, pages
Elsevier, 2023. Vol. 172, article id 107673
Keywords [en]
Electron beam powder bed fusion, Fatigue, Defects, Surface Condition, Fractography, Chemical post-processing
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-20048DOI: 10.1016/j.ijfatigue.2023.107673ISI: 000980678300001Scopus ID: 2-s2.0-8515212132OAI: oai:DiVA.org:hv-20048DiVA, id: diva2:1766583
Funder
Vinnova, 2017-04846
Note

CC BY 4.0

This work was supported by GKN Aerospace Sweden AB and VINNOVA through the seventh Swedish national aeronautics research programme (NFFP7).

Available from: 2023-06-13 Created: 2023-06-13 Last updated: 2024-01-08Bibliographically approved

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Hansson, Thomas

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