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The Effect of Location and Post-treatment on the Microstructure of EBM-Built 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

Additive manufacturing (AM) of Ni-based superalloys such as Alloy 718 may obviate the need for difficult machining and welding operations associated with geometrically intricate parts, thus potentially expanding design possibilities and facilitating cost-effective manufacture of complex components. However, processing AM builds completely free from defects , which may impair mechanical properties such as fatigue and ductility, is challenging. Anisotropic properties, microstructural heterogeneities and local formation of undesired phases are additional concerns that have motivated post-treatment of AM builds. This work investigates the microstructural changes associated with post-treatment of Alloy 718 specimens produced by Electron Beam Melting (EBM ) for as-built microstructures at 3 build heights: near base plate, in the middle of build and near the top of the build. Two different post-treatment conditions, hot isostatic pressing (HIP ) alone and a combined HIP with solutionising and two-step aging were examined and compared to the results for the as-built condition. The influence of various post-treatments on minor phase distributions (δ , γ″, carbides), overall porosity, longitudinal grain widths and Vickers microhardness was considered. The HIP treatment led to significant reduction in overall porosity and dissolution of δ phase, which led to appreciable grain growth for both post-treatment conditions. The variation in hardness noted as a function of build height for the as-built specimens was eliminated after post-treatment . Overall, the hardness was found to decrease after HIP and increase after the full HIP , solutionising and aging treatment, which was attributed to dissolution of γ″ during HIP and its re-precipitation in subsequent heat treatment steps.

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Acknowledgements

Dr. Eric Tam and Dr. Yiming Yao, Chalmers University of Technology, are acknowledged for their help with XRD and SEM measurements, respectively. Financial assistance by the KK Foundation (20160281) is gratefully acknowledged.

Author information

Authors and Affiliations

  1. Department of Engineering Science, University West, 461 86, Trollhättan, Sweden

    Sneha Goel, Jonas Olsson & Shrikant Joshi

  2. Quintus Technologies AB, 721 66, Västerås, Sweden

    Magnus Ahlfors

  3. Department of Industrial and Materials Science, Chalmers University of Technology, 412 96, Gothenburg, Sweden

    Uta Klement

Authors
  1. Sneha Goel
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  2. Jonas Olsson
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  3. Magnus Ahlfors
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  4. Uta Klement
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  5. Shrikant Joshi
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Corresponding author

Correspondence to Sneha Goel .

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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Goel, S., Olsson, J., Ahlfors, M., Klement, U., Joshi, S. (2018). The Effect of Location and Post-treatment on the Microstructure of EBM-Built 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_6

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