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Isothermal Oxidation Behavior of EBM-Additive Manufactured Alloy 718
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. (PTW)ORCID iD: 0000-0001-6610-1486
Linköping University,Department of Management and Engineering, Linköping, Sweden.
Linköping University,Department of Management and Engineering, Linköping, Sweden.
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2018 (English)In: Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications / [ed] Ott, E., Liu, X., Andersson, J., Bi, Z., Bockenstedt, K., Dempster, I., Groh, J., Heck, K., Jablonski, P., Kaplan, M., Nagahama, D. and Sudbrack, C., Springer, 2018, p. 219-240Conference paper, Published paper (Refereed)
Abstract [en]

Oxidation of Alloy 718 manufactured by electron beam melting (EBM) process has been undertaken in ambient air at 650, 700, and 800 °C for up to 168 h. At 800 °C, a continuous external chromia oxide enriched in (Cr, Ti, Mn, Ni) and an internal oxide that was branched structure of alumina formed, whereas at 650 and 700 °C, a continuous, thin and protective chromia layer was detected. The oxidation kinetics of the exposed EBM Alloy 718 followed the parabolic rate law with an effective activation energy of ~248 ± 22 kJ/mol in good agreement with values in the literature for conventionally processed chromia-forming Ni-based superalloys. The oxide scale formed on the surface perpendicular to the build direction was slightly thicker, and more adherent compared to the scale formed on the surface along the build direction, attributed to the varied grain texture in the two directions of the EBM-manufactured specimens. The increased oxygen diffusion and high Cr depletion found on the surface along the build direction were attributed to the fine grains and formation of vacancies/voids along this grain orientation.

Place, publisher, year, edition, pages
Springer, 2018. p. 219-240
Series
The Minerals, Metals & Materials Series, ISSN 2367-1181, E-ISSN 2367-1696
Keywords [en]
Additive manufacturing, Electron beam melting, Alloy 718, Oxidation behavior, Grain texture
National Category
Metallurgy and Metallic Materials Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-12347DOI: 10.1007/978-3-319-89480-5_13ISBN: 978-3-319-89479-9 (print)ISBN: 978-3-319-89480-5 (electronic)OAI: oai:DiVA.org:hv-12347DiVA, id: diva2:1259027
Conference
9th International Symposium on Superalloy 718 & Derivatives, Energy, Aerospace, and Industrial Application, Pittsburgh, Pennsylvania, USA, 3-6 June, 2018
Note

First Online: 13 May 2018

Available from: 2018-10-26 Created: 2018-10-26 Last updated: 2019-01-10Bibliographically approved

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Sadeghimeresht, EsmaeilKarimi Neghlani, PariaAndersson, JoelJoshi, Shrikant V.

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Sadeghimeresht, EsmaeilKarimi Neghlani, PariaAndersson, JoelJoshi, Shrikant V.
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Division of Subtractive and Additive ManufacturingDivision of Welding TechnologyResearch Enviroment Production Technology West
Metallurgy and Metallic MaterialsManufacturing, Surface and Joining Technology

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