Constitutive model and hot processing map of Ti80 titanium alloy during high temperature deformation in two-phase region

doi:10.13251/j.issn.0254-6051.2022.05.004

Abstract

Abstract: In order to determine the best process window for hot deformation of Ti80 titanium alloy, high temperature compression test of Ti80 titanium alloy was carried out by Gleeble3500 thermal simulation test machine with deformation temperature between 850-1050 ℃, and the strain rate between 0.05-1 s^-1. The results show that Ti80 titanium alloy is very sensitive to deformation temperature and strain rate, and the flow stress increases significantly with the increase of strain rate and the decrease of deformation temperature. In the near β region, the distribution of flow stress will change suddenly. The high temperature constitutive equation of the Ti80 titanium alloy is established by using the linear regression method. The deformation activation energy of the Ti80 titanium alloy in the two-phase region is calculated to be 308 kJ/mol. Based on the Prasad instability criterion, the hot processing map of the Ti80 titanium alloy is established. Finally, it is determined that the Ti80 titanium alloy can fully recrystallize at high strain rate when the deformation temperature is between 880-930 ℃, and then ideal microstructure and properties can be obtained.

Key words: Ti80 titanium alloy, deformation temperature, strain rate, constitutive equation, hot processing map

CLC Number:

TG335

Zhou Xiaofeng, Fu Wen, Li Chengning, Cheng Fangjie. Constitutive model and hot processing map of Ti80 titanium alloy during high temperature deformation in two-phase region[J]. Heat Treatment of Metals, 2022, 47(5): 25-30.

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