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Fine equiaxed β grains and superior tensile property in Ti–6Al–4V alloy deposited by coaxial electron beam wire feeding additive manufacturing

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

Coarse columnar β grains result in anisotropic mechanical properties in Ti alloys deposited by additive manufacturing. This study reports that Ti–6Al–4V alloy fabricated by coaxial electron beam wire feeding additive manufacturing presents a weak anisotropy, high strength and ductility. The superior tensile property arises from a microstructure with fine equiaxed β grains (EGβ), discontinuous grain boundary α phase and short intragranular α lamellae. A large region of fine EGβ arises from a special combination of the temperature gradient and solidification rate, and attractive α morphology is caused by solid phase transformations during interpass thermal cycling and post heat treatments.

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Acknowledgements

This work was supported by the internal funding source from University of Shanghai for Science and Technology.

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China

    Jiahua Zhang, Yi Yang, Zhiqiang Cao & Songquan Wu

  2. School of Materials, University of Manchester, Oxford Road, Manchester, M13 9PL, UK

    Sheng Cao

  3. JSC NVO Chervona Hvilya, Kiev, Ukraine

    Dmytro Kovalchuk

  4. Shanghai Aircraft Design and Research Institute, Shanghai, 201210, China

    Enquan Liang & Xi Zhang

  5. Key Laboratory of Power Beam Processing, AVIC Manufacturing Technology Institute, Beijing, 100024, China

    Wei Chen & Fan Wu

  6. Department of Materials Science and Engineering, Monash University, Clayton, VIC, 3800, Australia

    Aijun Huang

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  1. Jiahua Zhang
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Correspondence to Yi Yang.

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Zhang, J., Yang, Y., Cao, S. et al. Fine equiaxed β grains and superior tensile property in Ti–6Al–4V alloy deposited by coaxial electron beam wire feeding additive manufacturing. Acta Metall. Sin. (Engl. Lett.) 33, 1311–1320 (2020). https://doi.org/10.1007/s40195-020-01073-5

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  • DOI: https://doi.org/10.1007/s40195-020-01073-5

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