Transactions of Materials and Heat Treatment

Title：Establishment and modification on Zerilli-Armstrong constitutive model for 18CrNiMo7-6 alloy steel

Authors： Guo Ziyang1 Wang Wei1 2 Ma Shibo1 2 Yan Huajun1 2 Mu Zhenkai1 2

Unit： 1.School of Materials Science and Engineering Hebei University of Science and Technology 2.Hebei Key Laboratory of Material Nearnet Forming Technology Hebei University of Science and Technology

KeyWords： 18CrNiMo7-6 alloy steel Zerilli-Armstrong constitutive model thermal deformation behavior isothermal compression test model modification

ClassificationCode：TG386.2

year,vol(issue):pagenumber：2024,49(4):235-241

Abstract：

For 18CrNiMo7-6 alloy steel, the isothermal compression tests were conducted under the conditions of the strain rate of 0.001-1 s-1 and the deformation temperature of 700-1000 ℃ by Gleeble-3500 thermal simulation test machine, and the true stress-true strain curves of 18CrNiMo7-6 alloy steel under different conditions were obtained. Then, the thermal deformation behavior of 18CrNiMo7-6 alloy steel was analyzed, and the Zerilli-Armstrong (Z-A) constitutive model of 18CrNiMo7-6 alloy steel was constructed to describe its thermal deformation behavior. By comparing and analysing the predicted value of Z-A constitutive model with the test value of isothermal compression test, it was found that the linear correlation coefficient between the predicted and test values was 0.9750, and the average relative error was 8.1792%. In order to further improve the prediction accuracy of the model, the fifth-order polynomial of strain was used to describe the material parameters related to strain in Z-A constitutive model, and the model was modified. The linear correlation coefficient between the predicted value of the modified Z-A constitutive model and the test value was 0.9853, and the average relative error was 5.5358%, which effectively improved the prediction accuracy of the constitutive model.

Funds：

国家自然科学基金资助项目（52205353）；河北省自然科学基金资助项目（E2021208025，E2020208044）

作者简介：郭自洋（1998-），男，硕士研究生 E-mail：15613314604@163.com 通信作者：王伟（1986-），男，博士，副教授 E-mail：18631175658@163.com

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