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Isothermal Oxidation Behavior of EBM-Additive Manufactured Alloy 718

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

Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

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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Acknowledgements

The authors would like to thank Mr. Dunyong Deng and Mr. Jonas Olsson for their valuable help and advice in characterizing the samples. Dr. Chantal Sudbrack from QuesTek Innovations, LLC is greatly acknowledged for her comments/suggestions and input into the paper.

Author information

Authors and Affiliations

  1. Department of Engineering Science, University West, 46153, Trollhättan, Sweden

    Esmaeil Sadeghimeresht, Paria Karimi, Joel Andersson & Shrikant Joshi

  2. Department of Management and Engineering, Linköping University, 58183, Linköping, Sweden

    Pimin Zhang & Ru Peng

  3. School of Science and Technology, Örebro University, 70182, Örebro, Sweden

    Lars Pejryd

Authors
  1. Esmaeil Sadeghimeresht
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  2. Paria Karimi
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  3. Pimin Zhang
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  4. Ru Peng
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  5. Joel Andersson
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  7. Shrikant Joshi
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Corresponding author

Correspondence to Esmaeil Sadeghimeresht .

Editor information

Editors and Affiliations

  1. General Electric, Cincinnati, Ohio, USA

    Eric Ott

  2. West Virginia University, Morgantown, West Virginia, USA

    Xingbo Liu

  3. University West, Trollhättan, Sweden

    Joel Andersson

  4. China Iron and Steel Research Institute, Beijing, China

    Zhongnan Bi

  5. ‎ATI Specialty Materials, Monroe, North Carolina, USA

    Kevin Bockenstedt

  6. Wyman Gordon Forgings Inc., Houston, Texas, USA

    Ian Dempster

  7. General Electric, Cincinnati, Ohio, USA

    Jon Groh

  8. Carpenter Technology, Philadelphia, Pennsylvania, USA

    Karl Heck

  9. United States Department of Energy, Albany, New York, USA

    Paul Jablonski

  10. Pratt & Whitney, East Hartford, Connecticut, USA

    Max Kaplan

  11. Honda Motor Co. Ltd., Saitama, Japan

    Daisuke Nagahama

  12. QuesTek Innovations, Evanston, Illinois, USA

    Chantal Sudbrack

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Sadeghimeresht, E. et al. (2018). Isothermal Oxidation Behavior of EBM-Additive Manufactured Alloy 718. In: Ott, E., et al. Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-89480-5_13

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