Dynamic mechanical behavior and constitutive model of HST2425 titanium alloy

doi:10.13251/j.issn.0254-6051.2023.01.015

Abstract

Abstract: Quasi-static and dynamic mechanical properties of HST2425 titanium alloy at temperatures ranging from 293 K to 673 K and strain rates ranging from 0.0001 s^-1 to 6500 s^-1 were investigated by using an electronic universal testing machine and Split Hopkinson bar (SHPB) device. The results show that with the increase of strain rate, both the maximum stress and maximum strain of the HST2425 titanium alloy increase, but the increase rate of maximum stress decreases when the strain rate exceeds 3500 s^-1, but the increase rate of maximum stress decreases when the strain rate exceeds 3500 s^-1, and the increase rate of maximum strain decreases when the strain rate exceeds 5500 s^-1. As the deformation temperature increases, the flow stress decreases significantly, and the temperature and strain rate have an interaction in the dynamic compression process. The original Johnson-Cook (J-C) model and its modified model of the HST2425 titanium alloy are established based on the experimental results, and the correlation between the modified model and the experimental values is better than the original model, indicating that the modified model has higher accuracy and applicability in predicting the dynamic impact deformation behavior of the HST2425 titanium alloy.

Key words: HST2425 titanium alloy, Johnson-Cook constitutive model, dynamic mechanical behavior, strain rate

CLC Number:

TG146.2

Guo Fengting, Cong Liangchao, Guo Xinhu, Du Feifei, Sun Xudong. Dynamic mechanical behavior and constitutive model of HST2425 titanium alloy[J]. Heat Treatment of Metals, 2023, 48(1): 87-94.

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