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Effect of Hypoeutectic Boron Additions on the Grain Size and Mechanical Properties of Ti-6Al-4V Manufactured with Powder Bed Electron Beam Additive Manufacturing

JOM volume 69, pages 472–478 (2017)Cite this article

Abstract

In additive manufacturing, microstructural control is feasible via processing parameter alteration. However, the window for parameter variation for certain materials, such as Ti-6Al-4V, is limited, and alternative methods must be employed to customize microstructures. Grain refinement and homogenization in cast titanium alloys has been demonstrated through the addition of hypoeutectic concentrations of boron. This work explores the influence of 0.00 wt.%, 0.25 wt.%, 0.50 wt.%, and 1.0 wt.% boron additions on the microstructure and bulk mechanical properties of Ti-6Al-4V samples fabricated in an Arcam A2 electron beam melting (EBM) system with commercial processing parameters for Ti-6Al-4V. Analyses of EBM fabricated Ti-6Al-4V + B indicate that the addition of 0.25–1.0 wt.% boron progressively refines the grain structure, and it improves hardness and elastic modulus. Despite a reduction in size, the β grain structure remained columnar as a result of directional heat transfer during EBM fabrication.

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Acknowledgements

The authors declare that they have no conflict of interest. This work was funded by the Center for Additive Manufacturing and Logistics. The authors wish to thank ATI Specialty Materials for providing the materials used in this study.

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Authors and Affiliations

  1. Center for Additive Manufacturing and Logistics, North Carolina State University, Raleigh, NC, USA

    Zaynab Mahbooba, Harvey West, Ola Harrysson & Timothy Horn

  2. ATI Powder Metals, Robinson, PA, USA

    Andrzej Wojcieszynski

  3. Oak Ridge National Laboratory, Oak Ridge, TN, USA

    Ryan Dehoff & Peeyush Nandwana

Authors
  1. Zaynab Mahbooba
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  2. Harvey West
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  3. Ola Harrysson
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  4. Andrzej Wojcieszynski
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  5. Ryan Dehoff
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  6. Peeyush Nandwana
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  7. Timothy Horn
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Correspondence to Timothy Horn.

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Mahbooba, Z., West, H., Harrysson, O. et al. Effect of Hypoeutectic Boron Additions on the Grain Size and Mechanical Properties of Ti-6Al-4V Manufactured with Powder Bed Electron Beam Additive Manufacturing. JOM 69, 472–478 (2017). https://doi.org/10.1007/s11837-016-2210-9

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  • DOI: https://doi.org/10.1007/s11837-016-2210-9

Keywords

  • Boron
  • Ultimate Tensile Strength
  • Additive Manufacturing
  • Boron Concentration
  • Electron Beam Melting