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2018 | OriginalPaper | Buchkapitel

Isothermal Oxidation Behavior of EBM-Additive Manufactured Alloy 718

verfasst von : Esmaeil Sadeghimeresht, Paria Karimi, Pimin Zhang, Ru Peng, Joel Andersson, Lars Pejryd, Shrikant Joshi

Erschienen in: Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications

Verlag: Springer International Publishing

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Abstract

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.

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Titel: Isothermal Oxidation Behavior of EBM-Additive Manufactured Alloy 718
verfasst von: Esmaeil Sadeghimeresht
Paria Karimi
Pimin Zhang
Ru Peng
Joel Andersson
Lars Pejryd
Shrikant Joshi
Verlag: Springer International Publishing
Buch: Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications
Print ISBN: 978-3-319-89479-9

Electronic ISBN: 978-3-319-89480-5

Copyright-Jahr: 2018
DOI: https://doi.org/10.1007/978-3-319-89480-5_13

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