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An Analysis on the Constitutive Models for Forging of Ti6Al4V Alloy Considering the Softening Behavior

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Abstract

This paper developed high-temperature deformation constitutive models for a Ti6Al4V alloy using an empirical-based Arrhenius equation and an enhanced version of the authors’ physical-based EM + Avrami equations. The initial microstructure was a partially equiaxed α + β grain structure. A wide range of experimental data was obtained from hot compression of the Ti6Al4 V alloy at deformation temperatures ranging from 720 to 970 °C, and at strain rates varying from 0.01 to 10 s−1. The friction- and adiabatic-corrected flow curves were used to identify the parameter values of the constitutive models. Both models provided good overall accuracy of the flow stress. The generalized modified Arrhenius model was better at predicting the flow stress at lower strain rates. However, the model was inaccurate in predicting the peak strain. In contrast, the enhanced physical-based EM + Avrami model revealed very good accuracy at intermediate and high strain rates, but it was also better at predicting the peak strain. Blind sample tests revealed that the EM + Avrami maintained good predictions on new (unseen) data. Thus, the enhanced EM + Avrami model may be preferred over the Arrhenius model to predict the flow behavior of Ti6Al4V alloy during industrial forgings, when the initial microstructure is partially equiaxed.

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Acknowledgments

The authors wish to acknowledge the Australian Research Council (FL0992361) and Bharat Forge Ltd., for the funding and support provided to carry out this research.

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Authors and Affiliations

  1. Institute of Frontier Materials, Deakin University, Geelong, Australia

    Paul M. Souza, Hossein Beladi & Peter D. Hodgson

  2. School of Engineering, Deakin University, Geelong, Australia

    Bernard Rolfe

  3. Kalyani Center for Technology and Innovation, Bharat Forge Ltd, Pune, India

    Rajkumar P. Singh

  4. Research and Development, Mishra Dhatu Nigam Limited, Hyderabad, India

    Paul M. Souza

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  1. Paul M. Souza
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  4. Peter D. Hodgson
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  5. Bernard Rolfe
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Correspondence to Paul M. Souza.

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Souza, P.M., Beladi, H., Singh, R.P. et al. An Analysis on the Constitutive Models for Forging of Ti6Al4V Alloy Considering the Softening Behavior. J. of Materi Eng and Perform 27, 3545–3558 (2018). https://doi.org/10.1007/s11665-018-3402-y

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  • DOI: https://doi.org/10.1007/s11665-018-3402-y

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