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Hot deformation behavior and processing maps of Ti–6Al–4V alloy with starting fully lamellar structure

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Abstract

The hot deformation behavior of Ti–6Al–4V alloy with starting fully lamellar microstructure was investigated by conducting isothermal hot compression tests at the temperature of 700–1000 °C and strain rate of 0.001–10 s−1. The deformation activation energy is calculated to be 342 kJ/mol at temperatures from 750 to 850 °C, whereas the higher apparent activation energy of 610 kJ/mol is obtained at a high temperature regime of 900–1000 °C. The relationship between the dynamic softening behavior and deformation parameters was analyzed by power dissipation efficiency η, which shows an increasing trend as the deformation temperature increases and strain rate decreases, respectively. Processing maps were constructed. The instability flow is dominated by the presence of adiabatic shear bands, and the dynamic softening is mainly caused by a combination effect of dynamic recrystallization and dynamic recovery. Moreover, straining is found to have a positive effect on lowering the phase transformation temperature.

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ACKNOWLEDGMENT

The present work is financially supported by the National Natural Science Foundation of China under Grant No. 51334006.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, China

    Wenjing Zhang, Hua Ding, Bo Yang & Wenjing Yang

  2. School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong, NSW, 2522, Australia

    Jingwei Zhao

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  1. Wenjing Zhang
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Correspondence to Hua Ding.

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Zhang, W., Ding, H., Zhao, J. et al. Hot deformation behavior and processing maps of Ti–6Al–4V alloy with starting fully lamellar structure. Journal of Materials Research 33, 3677–3688 (2018). https://doi.org/10.1557/jmr.2018.331

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