Prediction of High Temperature Flow Stress of Alloy 2618-Ti during Hot Deformation

• Main Authors: Liu Ya, Li Jing, Song Yuanfeng, Li Tao, Su Xuping, Wang Jianhua
• Format: Article
• Language: English
• Published: De Gruyter 2015-02-01
• Series: High Temperature Materials and Processes
• Subjects: alloy 2618-ti; hot deformation; flow stress; constitutive equation; 81.70.-q; 81.05.bx
• Online Access: https://doi.org/10.1515/htmp-2013-0115
• ISSN: 0334-6455; 2191-0324

In order to find material parameters of established Zener-Hollomon constitutive equations and predict high-temperature flow stress of alloy 2618-Ti, the hot compressive deformation behaviors of the alloy were investigated at temperatures ranging from 300 to 500 °C at intervals of 50 °C and at constant strain rates of 0.001, 0.01, 0.1 and 1 s−1 using a Gleeble-3500 thermomechanical simulator. The material constants α, n, A and activation energy Q of alloy 2618-Ti were calculated by constitutive equations. The results show that the true stress-true strain curve exhibits a peak stress at a very small strain at every testing temperature. The peak flow stresses of alloy 2618-Ti calculated using the proposed constitutive equations agree well with experimental results. The activation energy of hot deformation for alloy 2618-Ti is 306.8 kJ/mol, while it is only 181 kJ/mol for alloy 2618.