Abstract
Additive manufacturing or 3D-printing of titanium alloys with a high strength-to-weight ratio holds significant interest in the aerospace and biomedical industries. The purpose of this investigation was to determine microstructure and tensile deformation behavior of a 3D-printed Ti-6Al-4V alloy via selective electron beam melting (SEBM). Plentiful multi-oriented α-lamellae were present in the prior columnar β grains, which were oriented in the building direction because of the presence of temperature gradients during 3D-printing. The processing parameters selected in this study ensured superior strength and high ductility by controlling the thickness of α-lamellae, with both surpassing the values specified in the ASTM standard. The horizontally orientated 3D-printed alloy demonstrated a certain extent of strain rate sensitivity which decreased with increasing strain, suggesting that dislocation slip was a predominant deformation mode, since the fine and abundant multi-oriented α-lamellae could impede the formation of extension twinning. Fracture surface was observed to be characterized by typical dimples and some entrapped gas pores.
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Acknowledgements
The authors are grateful for the financial support provided by the National Natural Science Foundation of China (NSFC) (Grant No. 51871168) and the Natural Sciences and Engineering Research Council of Canada (NSERC) in the form of international research collaboration. The authors appreciated Q. L, A. M, J. A and R. C for kind assistances.
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Zhang, Y., Qu, S., Feng, A., Chen, D. (2020). Tensile Behavior of a Titanium Alloy Additively Manufactured via Selective Electron Beam Melting. In: Gdoutos, E., Konsta-Gdoutos, M. (eds) Proceedings of the Third International Conference on Theoretical, Applied and Experimental Mechanics. ICTAEM 2020. Structural Integrity, vol 16. Springer, Cham. https://doi.org/10.1007/978-3-030-47883-4_3
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DOI: https://doi.org/10.1007/978-3-030-47883-4_3
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