High-Temperature Mechanical Properties and Constitutive Modelling of Ti6Al4V Sheets

Abstract:

In this paper, tensile tests were performed at elevated temperature and strain rate in order to investigate the plastic flow behavior, anisotropic characteristics and microstructural evolution of Ti6Al4V sheets under testing conditions similar to the ones experienced during hot stamping operations. It is shown that the Ti6Al4V anisotropic characteristics under the investigated forming conditions, different from the ones of the superplastic regime, are influenced by the variation of the material texture as a function of the testing temperature. The Ti6Al4V flow stress behavior was analyzed as a function of the deformation temperature and strain rate. Afterwards, the Arrhenius constitutive model was proposed to predict the flow behavior of Ti6Al4V sheets at elevated temperature and strain rate. The statistical analysis of its predictive capabilities suggests that the Arrhenius model guarantees a good accuracy in reproducing the flow behavior of Ti6Al4V sheets.

• Periodical: Materials Science Forum (Volume 879)
• Pages: 2020-2025
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.879.2020
• Online since: November 2016
• Authors: Beatrice Valoppi*, Stefania Bruschi, Andrea Ghiotti
• Keywords: Constitutive Modelling, Electron Backscatter Diffraction (EBSD), Microstructure, Sheet Forming, Ti6Al4V

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