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Microstructure and Tensile Properties of a CoNi-Based Superalloy Fabricated by Selective Electron Beam Melting

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Superalloys 2020

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

Abstract

Successful application of selective electron beam melting to a novel CoNi-based superalloy named SB-CoNi-10 is demonstrated. Crack-free as-printed microstructures exhibit excellent ductilities above 30% and ultimate tensile strengths above 1.1 GPa at room temperature in tension. Conventional post-processing consisting of a super-solvus hot isostatic pressing (HIP), a solution heat treatment (SHT), and a low-temperature aging has been applied to remove microstructural inhomogeneities present in the as-printed microstructure. The microstructures of the as-printed and HIP+SHT+Aged alloys have been investigated to determine the effect of post-processing heat treatments on the nanoscale \(\gamma \)/\(\gamma ^{\prime }\) microstructure and the mesoscale grain structure. Tensile tests have been conducted at room temperature and elevated temperatures above 850 \(^{\circ }\)C to investigate mechanical properties in both the as-printed and HIP+SHT+Aged conditions. The high-temperature ductility and strength are strongly affected by the microstructure, with a mostly columnar-grained microstructure in the as-printed condition exhibiting superior ductility to the fully recrystallized microstructure in the HIP+SHT+Aged condition.

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Notes

  1. 1.

    CM 247\(^\circledR \) is a registered trademark of the Cannon-Muskegon Corporation.

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Acknowledgements

Funding for this research was provided by a DoD Vannevar Bush Faculty Fellowship, Grant ONR N00014-18-3031. In addition, tuition and stipend funding was provided to S.P.M. by a DoD National Defense Science and Engineering Graduate Fellowship. This research was sponsored by the US Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office, under contract DE-AC05-00OR22725 with UT-Battelle, LLC, and performed in partiality at the Oak Ridge National Laboratory’s Manufacturing Demonstration Facility, an Office of Energy Efficiency and Renewable Energy user facility. Thanks are due to Dr. Brent Goodlet for technical assistance with the RUS measurements.

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Authors and Affiliations

  1. Materials Department, University of California Santa Barbara, Santa Barbara, CA, 93106, USA

    Sean P. Murray, Kira M. Pusch, Andrew T. Polonsky, Chris J. Torbet & Tresa M. Pollock

  2. Department of Earth Science, University of California Santa Barbara, Santa Barbara, CA, 93106, USA

    Gareth G. E. Seward

  3. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA

    Peeyush Nandwana, Michael M. Kirka & Ryan R. Dehoff

  4. R&D Department, Carpenter Technology Corp., Reading, PA, 19612, USA

    Ning Zhou, Stéphane A. J. Forsik & William Slye

Authors
  1. Sean P. Murray
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  12. Tresa M. Pollock
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Corresponding author

Correspondence to Sean P. Murray .

Editor information

Editors and Affiliations

  1. Illinois Institute of Technology, Chicago, IL, USA

    Sammy Tin

  2. Rolls-Royce, Derby, UK

    Mark Hardy

  3. PCC Structurals, Portland, OR, USA

    Justin Clews

  4. ISAE-ENSMA, Chasseneuil-du-Poitou, France

    Jonathan Cormier

  5. University of Science and Technology, Beijing, China

    Qiang Feng

  6. Collins Aerospace, Windsor Locks, CT, USA

    John Marcin

  7. ATI Specialty Materials, Monroe, NC, USA

    Chris O'Brien

  8. GE Global Research, Niskayuna, NY, USA

    Akane Suzuki

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Murray, S.P. et al. (2020). Microstructure and Tensile Properties of a CoNi-Based Superalloy Fabricated by Selective Electron Beam Melting. In: Tin, S., et al. Superalloys 2020. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-51834-9_86

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