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The Origin of Microstructural Diversity, Texture, and Mechanical Properties in Electron Beam Melted Ti-6Al-4V

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Abstract

An additive layer manufacture (ALM) technique, electron beam melting, has been used for the production of simple geometries, from prealloyed Ti-6Al-4V powder. Microstructure, texture, and mechanical properties achieved under standard operating conditions have been investigated. Three transitional regions are observed with a change in microstructural formation dependent on the thermal mass of deposited material. Prior β-phase reconstruction, from room temperature α-phase electron backscatter diffraction (EBSD) data, reveals a strong texture perpendicular to the build axis. Variation of build temperature within the processing window of 898 K to 973 K (625 °C to 700 °C) is seen to have a significant effect on the properties and microstructure of both as-deposited and hot isostatically pressed (HIP) samples.

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Acknowledgments

The authors acknowledge the help and advice given by Drs. Peter Davies and Bradley Wynne (University of Sheffield), with prior β reconstructions and texture, and Arcam AB of Sweden for their help and useful discussions. This work has been financed by Yorkshire Forward, the Engineering and Physical Sciences Research Council (EPSRC), and Renault Formula 1. The authors express their gratitude for this financial support.

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Authors and Affiliations

  1. Innovative Metals Processing Centre (IMPC) and the Institute for Microstructural and Mechanical Process Engineering (IMMPETUS), The University of Sheffield, Sheffield, S1 3JD, United Kingdom

    S. S. Al-Bermani (Postgraduate Student)

  2. The University of Sheffield, Sheffield, S1 3JD, United Kingdom

    I. Todd (Reader in Metallurgy and Director, IMPC, and Member, IMMPETUS)

  3. IMPC, Engineering Materials, The University of Sheffield, Sheffield, S1 3JD, United Kingdom

    M. L. Blackmore (Design Engineer) & W. Zhang (Postdoctoral Research Assistant)

Authors
  1. S. S. Al-Bermani
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  2. M. L. Blackmore
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  3. W. Zhang
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  4. I. Todd
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Correspondence to S. S. Al-Bermani.

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Manuscript submitted December 10, 2009.

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Al-Bermani, S.S., Blackmore, M.L., Zhang, W. et al. The Origin of Microstructural Diversity, Texture, and Mechanical Properties in Electron Beam Melted Ti-6Al-4V. Metall Mater Trans A 41, 3422–3434 (2010). https://doi.org/10.1007/s11661-010-0397-x

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