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Trace Carbon Addition to Refine Microstructure and Enhance Properties of Additive-Manufactured Ti-6Al-4V

  • Additive Manufacturing of Ti Components
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Abstract

Carbon is a powerful alloying element for titanium alloys. In this work, trace carbon is alloyed with Ti-6Al-4V during wire + arc additive manufacturing, and the effects on the solidification process, microstructure and mechanical properties are explored. With between 0.03 wt.% and 0.41 wt.% carbon, the prior-β grain size and α-lath length reduce by factors of 5–6 which is attributed to separate grain refining mechanisms. Alloying Ti-6Al-4V with up to 0.1 wt.% carbon improved both the tensile strength and ductility, but higher carbon additions were associated with excessive carbide formation and severe embrittlement.

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Acknowledgements

The authors would like to acknowledge to support of the School of Mechanical and Mining Engineering and the Queensland Centre for Advanced Materials processing and Manufacturing. M.J. Bermingham acknowledges the support of the Australian Research Council Discovery Program and is in receipt of Discover Early Career Researcher Award (DE160100260). All authors acknowledge the support of the Australian Research Council Research Hub for Advanced Manufacturing of Medical Devices (IH150100024).

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Authors and Affiliations

  1. Centre for Advanced Materials Processing and Manufacturing, School of Mechanical and Mining Engineering, The University of Queensland, St Lucia, QLD, 4072, Australia

    S. Mereddy, M. J. Bermingham, A. Dehghan-Manshadi, D. H. StJohn & M. S. Dargusch

  2. School of Science and Engineering, University of the Sunshine Coast, Maroochydore DC, QLD, 4558, Australia

    D. Kent

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  1. S. Mereddy
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  2. M. J. Bermingham
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  3. D. Kent
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  4. A. Dehghan-Manshadi
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  5. D. H. StJohn
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  6. M. S. Dargusch
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Correspondence to M. J. Bermingham.

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Mereddy, S., Bermingham, M.J., Kent, D. et al. Trace Carbon Addition to Refine Microstructure and Enhance Properties of Additive-Manufactured Ti-6Al-4V. JOM 70, 1670–1676 (2018). https://doi.org/10.1007/s11837-018-2994-x

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  • DOI: https://doi.org/10.1007/s11837-018-2994-x

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