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Microstructure and Mechanical Properties of Laser Solid Formed Ti-6Al-4V Alloy Under Dynamic Shear Loading

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Abstract

To investigate the mechanical properties of the Ti-6Al-4V alloy fabricated by laser solid forming technology, both static and dynamic shear tests were conducted on hat-shaped specimens by a servohydraulic testing machine and an enhanced split Hopkinson pressure bar system, over a temperature range of 173-573 K. The microstructure of both the original and deformed specimens was characterized by optical microscopy and scanning electron microscopy. The results show that: (1) the anisotropy of shear properties is not significant regardless of the visible stratification and the prior-β grains that grow epitaxially along the depositing direction; (2) the ultimate shear strength of this material is lower than that of those Ti-6Al-4V alloys fabricated by forging and extrusion; (3) the adiabatic shear bands of approximately 25.6-36.4 μm in width can develop at all selected temperatures during the dynamic shear deformation; and (4) the observed microstructure and measured microhardness indicate that the grains become refined in adiabatic shear band. Estimation of the temperature rise shows that the temperature in shear band exceeds the recrystallization temperature. The process of rotational dynamic recrystallization is considered to be the cause of the grain refinement in shear band.

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Acknowledgment

This research work was supported by the National Natural Science Foundation of China (Nos. 11572261 and 11372255).

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Authors and Affiliations

  1. School of Aeronautics, Northwestern Polytechnical University, Xi’an, 710072, China

    Ping Zhou, Wei-Guo Guo & Jianjun Wang

  2. Department of Mechanics, School of Aerospace Engineering, Beijing Institute of Technology, Beijing, 100081, China

    Yu Su

  3. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, China

    Xin Lin & Weidong Huang

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  1. Ping Zhou
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Correspondence to Wei-Guo Guo.

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Zhou, P., Guo, WG., Su, Y. et al. Microstructure and Mechanical Properties of Laser Solid Formed Ti-6Al-4V Alloy Under Dynamic Shear Loading. J. of Materi Eng and Perform 26, 3121–3132 (2017). https://doi.org/10.1007/s11665-017-2748-x

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  • DOI: https://doi.org/10.1007/s11665-017-2748-x

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