Hot Deformation Behavior of Ti-6Al-4V Alloy with a Transitional Microstructure in the Isothermal Hot Compression

Abstract:

The hot deformation behavior of Ti-6Al-4V alloy with transitional microstructure over temperature 800°C~950°C and strain rate ranges of 0.001~10s^-1 has been studied by Gleeble-3500 hot working simulation testing machine. The flow softening of stress-strain curves is resulted from the spheroidization of transitional microstructure, dynamic recrystallization and superplasticity. Both temperature and strain rate are important factors affecting the deformation behavior. Flow instability induced by adiabatic shear bands occurs at 800-880°Cand 0.32-10 s^-1. With the increasing of strain rate and decreasing of temperature, the degree of strain localization increases. The optimum working region of Ti-6Al-4V alloy with a transitional microstructure is at 820-910°C and 0.001-0.1 s^-1.

• Periodical: Advanced Materials Research (Volume 1019)
• Pages: 273-279
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1019.273
• Online since: October 2014
• Authors: Yong Xu, Xiang Jie Yang*, Xiong Xin Jiang, Yi He, Dan Ni Du
• Keywords: Flow Instability, Flow Softening, Processing Map, Ti-6Al-4V Alloy

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