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3D Characterization of the Columnar-to-Equiaxed Transition in Additively Manufactured Inconel 718

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Superalloys 2020

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

Abstract

Additive manufacturing (AM) provides enormous processing flexibility, enabling novel part geometries and optimized designs. Access to a local heat source further permits the potential for local microstructure control on the scale of individual melt pools, which can enable local control of part properties. In order to design tailored processing strategies for target microstructures, models predicting the columnar-to-equiaxed transition must be extended to the high solidification velocities and complex thermal histories present in AM. Here, we combine 3D characterization with advanced modeling techniques to develop a more complete understanding of the solidification process and evolution of microstructure during electron beam melting (EBM) of Inconel 718. Full calibration of existing microstructure prediction models demonstrates the differences between AM processes and more conventional welding techniques, underlying the need for accurate determination of key parameters that can only be measured directly in 3D. The ability to combine multisensor data in a consistent 3D framework via data fusion algorithms is essential to fully leverage these advanced characterization approaches. Thermal modeling provides insight on microstructure development within isolated solidification events and demonstrates the role of Marangoni effects on controlling solidification behavior.

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Acknowledgements

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. This research was also supported by the Department of Energy RAMP-UP program under award number 4000156470. Conflicts of Interest On behalf of all authors, the corresponding author states that there is no conflict of interest.

Author information

Authors and Affiliations

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

    Andrew T. Polonsky, McLean P. Echlin & Tresa M. Pollock

  2. Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA

    Narendran Raghavan

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

    Michael M. Kirka & Ryan R. Dehoff

Authors
  1. Andrew T. Polonsky
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  2. Narendran Raghavan
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  3. McLean P. Echlin
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  4. Michael M. Kirka
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  5. Ryan R. Dehoff
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  6. Tresa M. Pollock
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Corresponding author

Correspondence to Andrew T. Polonsky .

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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Polonsky, A.T., Raghavan, N., Echlin, M.P., Kirka, M.M., Dehoff, R.R., Pollock, T.M. (2020). 3D Characterization of the Columnar-to-Equiaxed Transition in Additively Manufactured Inconel 718. In: Tin, S., et al. Superalloys 2020. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-51834-9_97

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