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Correlations Between Powder Feedstock Quality, In Situ Porosity Detection, and Fatigue Behavior of Ti-6Al-4V Fabricated by Powder Bed Electron Beam Melting: A Step Towards Qualification

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Abstract

Ti-6Al-4V is the most studied alloy via electron beam melting (EBM) with regards to microstructure and mechanical behavior, but there have been no attempts to correlate in situ porosity detection and fatigue behavior. This is required for widespread adoption of EBM because conventional evaluation is often time-consuming and expensive. This paper presents the use of near-infrared imaging to detect and quantify porosity in Ti-6Al-4V builds fabricated from different powder feedstocks and its correlation to their fatigue response. We report that, for identical processing parameters, the variability in powder feedstock causes variations in porosity and scatter in the respective fatigue response.

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Acknowledgements

Research was sponsored by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office, under Contract DE-AC05-00OR22725 with UT-Battelle, LLC. This research at the Oak Ridge National Laboratory’s High Temperature Materials Laboratory was sponsored by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Program.

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Authors and Affiliations

  1. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, USA

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

  2. Manufacturing Demonstration Facility, Oak Ridge National Laboratory, Knoxville, USA

    Peeyush Nandwana, Michael M. Kirka, Vincent C. Paquit & Ryan R. Dehoff

  3. Electrical and Electronics Systems Research Division, Oak Ridge National Laboratory, Oak Ridge, USA

    Vincent C. Paquit

  4. Energy and Transportation Science Division, Oak Ridge National Laboratory, Oak Ridge, USA

    Sean Yoder

  5. Department of Mechanical, Aerospace, and Biomedical Engineering, The University of Tennessee, Knoxville, USA

    Sean Yoder

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  1. Peeyush Nandwana
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  2. Michael M. Kirka
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  3. Vincent C. Paquit
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  4. Sean Yoder
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  5. Ryan R. Dehoff
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Corresponding author

Correspondence to Peeyush Nandwana.

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This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).

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Nandwana, P., Kirka, M.M., Paquit, V.C. et al. Correlations Between Powder Feedstock Quality, In Situ Porosity Detection, and Fatigue Behavior of Ti-6Al-4V Fabricated by Powder Bed Electron Beam Melting: A Step Towards Qualification. JOM 70, 1686–1691 (2018). https://doi.org/10.1007/s11837-018-3034-6

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  • DOI: https://doi.org/10.1007/s11837-018-3034-6

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