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| Flow stress analysis and Arrhenius constitutive equation of near β titanium alloy Ti-55511 during thermoplastic deformation |
| LUO Deng1, HU Bin2, WANG Zhen1, ZHOU Wenhao1, KONG Bin3, ZHANG Xiaoyong2 |
1. Xiangtan Iron & Steel Group Co., Ltd., Xiangtan 411100, China;
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
3. Hunan Xiangtou Goldsky Titanium Metal Co., Ltd., Changsha 410205, China |
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Abstract Hot deformation behavior of Ti-55511 titanium alloy was studied at deformation temperatures of 700-850 ℃, strain rates of 0.01-10 s-1 and true strain of 0.6. The results indicate that the flow behavior of Ti-55511 titanium alloy is significantly affected by deformation temperature and strain rate. With the decrease of temperature and the increase of strain rate, the peak stress increases. In order to eliminate the deformation temperature rise effect in the process of hot compression and improve the accuracy of the model, a new temperature correction method was adopted in this paper. The temperature correction of the experimental flow stress curve was carried out through the Arrhenius constitutive equation derivation and combined with the mathematical extrapolation method. The results show that with the decrease of deformation temperature and the increase of strain rate, temperature rise and flow stress increment increase. The Arrhenius constitutive equation of strain-compensated is established, and the value of correlation coefficient (R2) and average absolute relative error (AARE) between experimental and predicted stress are 0.991 and 6.65%, respectively. This indicates that the established constitutive equation can accurately predict the flow stress under different thermal deformation conditions.
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Received: 24 March 2023
Published: 06 July 2023
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2023, Vol. 28 
