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Isothermal Oxidation Behavior of EBM-Additive Manufactured Alloy 718
Univ West, Sweden.
Univ West, Sweden.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
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2018 (English)In: PROCEEDINGS OF THE 9TH INTERNATIONAL SYMPOSIUM ON SUPERALLOY 718 and DERIVATIVES: ENERGY, AEROSPACE, AND INDUSTRIAL APPLICATIONS, SPRINGER INTERNATIONAL PUBLISHING AG , 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 degrees C for up to 168 h. At 800 degrees 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 degrees 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 similar to 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 INTERNATIONAL PUBLISHING AG , 2018. p. 219-240
Series
Minerals Metals & Materials Series, ISSN 2367-1181
Keywords [en]
Additive manufacturing; Electron beam melting; Alloy 718; Oxidation behavior; Grain texture
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-152110DOI: 10.1007/978-3-319-89480-5_13ISI: 000445800500013ISBN: 978-3-319-89480-5 (electronic)ISBN: 978-3-319-89479-9 (print)OAI: oai:DiVA.org:liu-152110DiVA, id: diva2:1256658
Conference
9th International Symposium on Superalloy 718 and Derivatives - Energy, Aerospace, and Industrial Applications
Available from: 2018-10-17 Created: 2018-10-17 Last updated: 2018-10-17

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
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Language
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  • sv-SE
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Output format
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