Transactions of Materials and Heat Treatment

Title：Research on high-temperature rheological behavior for HNi56-3 nickel brass alloy based on modified Johnson-Cook model

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ClassificationCode：TG146.1

year,vol(issue):pagenumber：2020,45(11):200-205

Abstract：

For HNi56-3 nickel brass alloy, the isothermal thermal compression experiments were conducted by Gleeble-3500 thermo-mechanical simulator under the deformation temperatures of 600-800 ℃ and the strain rates of 0.01-10 s-1, and the high-temperature rheological behavior of HNi56-3 nickel brass alloy was studied. The experimental results show that the rheological stress of HNi56-3 nickel brass alloy has a nonlinear relationship with deformation temperature, strain rate and strain, and the rheological stress increases with the increasing of strain rate and strain, and decreases with the increasing of deformation temperature. In order to describe the rheological behavior of HNi56-3 nickel brass alloy, the constitutive models were established by Lin-JC model modified by Lin Y C and Mlin-JC model modified by this paper. Comparing two models, the results show that the absolute value of average absolute relative error AARE of prediction data based on Lin-JC model is 11.8644%, the correlation coefficient R is 0.9803, and the root mean squared error RMSE is 4.6177 MPa. However, the corresponding values of AARE, R and RMSE based on MLin-JC model are 4.0325%, 0.9936 and 1.9017 MPa respectively. Thus, the prediction accuracy based on MLin-JC model is better, and the MLin-JC model can accurately describe the high-temperature rheological behavior of HNi56-3 nickel brass alloy.

Funds：

重庆市基础科学与前沿技术研究专项基金资助项目（cstc2017jcyjAX0175）；重庆市教育委员会科学技术研究项目(KJQN201900836)；重庆工商大学校内科研项目（1752009）

马斌（1971-），男，硕士，实验师 E-mail：mabin@ctbu.edu.cn

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