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Effect of build location on microstructural characteristics and corrosion behavior of EB-PBF built Alloy 718
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0001-6610-1486
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-7663-9631
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. GE Additive | Arcam EBM, Designvägen 2, Mölnlycke, 435 33, Sweden. (PTW)
Sandvik Additive Manufacturing, Sandviken, 811 81, Sweden.
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2020 (English)In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 106, no 7-8, p. 3597-3607Article in journal (Refereed) Published
Abstract [en]

Electron beam-powder bed fusion (EB-PBF), a high-temperature additive manufacturing (AM) technique, shows great promise in the production of high-quality metallic parts in different applications such as the aerospace industry. To achieve a higher build efficiency, it is ideal to build multiple parts together with as low spacing as possible between the respective parts. In the EB-PBF technique, there are many unknown variations in microstructural characteristics and functional performance that could be induced as a result of the location of the parts on the build plate, gaps between the parts and part geometry, etc. In the present study, the variations in the microstructure and corrosion performance as a function of the parts location on the build plate in the EB-PBF process were investigated. The microstructural features were correlated with the thermal history of the samples built in different locations on the build plate, including exterior (the outermost), middle (between the outermost and innermost), and interior (the innermost) regions. The cubic coupons located in the exterior regions showed increased level (~ 20 %) of defects (mainly in the form of shrinkage pores) and lower level (~ 30-35 %) of Nb-rich phase fraction due to their higher cooling rates compared to the interior and middle samples. Electrochemical investigations showed that the location indirectly had a substantial influence on the corrosion behavior, verified by a significant increase in polarization resistance (Rp) from the exterior (2.1 ± 0.3 kΩ.cm2) to interior regions (39.2 ± 4.1 kΩ.cm2). © 2020, The Author(s).

Place, publisher, year, edition, pages
2020. Vol. 106, no 7-8, p. 3597-3607
Keywords [en]
3D printers; Additives; Aerospace industry; Corrosion; Corrosive effects; Electron beams; Hardness; High temperature applications, Alloy 718; Electrochemical investigations; Functional performance; Micro-structural characteristics; Micro-structural characterization; Microstructural features; Polarization resistances; Powder bed, Location
National Category
Manufacturing, Surface and Joining Technology
Identifiers
URN: urn:nbn:se:hv:diva-15004DOI: 10.1007/s00170-019-04859-9ISI: 000511506500069Scopus ID: 2-s2.0-85077549789OAI: oai:DiVA.org:hv-15004DiVA, id: diva2:1395741
Funder
Knowledge FoundationEuropean Regional Development Fund (ERDF)Available from: 2020-02-24 Created: 2020-02-24 Last updated: 2020-02-27

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Karimi Neghlani, PariaSadeghi, EsmaeilÅlgårdh, JoakimAndersson, Joel

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