中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 30 No. 11 November 2020 |
（1. Research Institute of Light Alloy, Central South University, Changsha 410083, China;
2. Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center, Central South University, Changsha 410083, China;
3. State Key Laboratory of High performance Complex Manufacturing, Central South University, Changsha 410083, China;
4. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China）
Abstract:To better understand the hot deformation behaviors of Hastelloy C-276 alloy under elevated temperatures, hot tensile tests were carried out in the temperature range of 1223-1423 K and the strain rate range of 0.01-10 s-1, respectively. Based on the modified Zerilli-Armstrong, modified Johnson-Cook, and strain-compensated Arrhenius- type models, three constitutive equations were established to describe the high-temperature flow stress of this alloy. Meanwhile, the predictability of the obtained models was evaluated by the calculation of correlation coefficients (r) and absolute errors (Δ), where the values of r for the modified Zerilli-Armstrong, Johnson-Cook, and Arrhenius-type constitutive models were computed to be 0.935, 0.968 and 0.984, and the values of Δ were calculated to be 13.4%, 10.5% and 6.7%, respectively. Moreover, the experimental and predicted flow stresses were compared in the strain range of 0.1-0.5, the results further indicated that the obtained modified Arrhenius-type model possessed better predictability on hot flow behavior of Hastelloy C-276.
Key words: Hastelloy C-276 alloy; hot tensile behaviors; constitutive models; flow stress
