Transactions of Materials and Heat Treatment

Title：Constitutive equation of Q460NH high-strength weathering steel based on strain compensation and modification

Authors： Liu Peiyu1 2 Meng Zhijuan3 Liu Zijian 1 2 Du Yukang1 2 Zhao Liang1 4 Ma Haoxi1 4 Ma Lidong1 4

Unit： 1. Coordinative Innovation Center of Taiyuan Heavy Machinery Equipment Taiyuan University of Science and Technology 2. School of Materials Science and Engineering Taiyuan University of Science and Technology 3. School of Applied Science Taiyuan University of Science and Technology 4. School of Mechanical Engineering Taiyuan University of Science and Technology

KeyWords： Q460NH high-strength weathering steel constitutive equation experimental error correction strain compensation

ClassificationCode：

year,vol(issue):pagenumber：2022,47(3):219-226

Abstract：

In order to analyze the high-temperature deformation behavior of Q460NH steel, the thermal compression experiment was carried out by Gleeble-3800 thermal simulation experimental machine with the experimental temperature of 600-900 ℃, the strain rate of 0.01-10 s-1 and the deformation amount of 60%, and the Arrhenius hyperbolic sine equation of the constitutive relationship between Q，A，n，α and true strain was established by importing the function of Zener-Hollomon parameters and material parameters into the Arrhenius equation. Then, considering the influence of true strain on flow stress and experimental error at 700-800 ℃, the constitutive equation was modified, and the mathematical model representing the relationship between true strain and material parameters was established by an eighth-order polynomial. Furthermore, the high-temperature deformation constitutive equation of Q460NH steel including deformation temperature, strain rate and strain correlation was established. In order to verify the validity of the theoretical values calculated by the constitutive equation, the calculated theoretical values and the experimental data were compared, and the average error was analyzed with the correlation coefficient r value of 0.956 and AARE value only of 7.23%. The results show that the theoretical stress value calculated by the modified constitutive equation is in good agreement with the experimental data and has a high accuracy.

Funds：

国家重点研发计划（2018YFB1308700）；山西省应用基础研究计划（20191D111244，20191D211311）;山西省科技重大专项（20181102016）

刘佩钰（1995-），男，硕士研究生 E-mail：1121260670@qq.com 通信作者：马立东（1980-），男，博士，教授 E-mail：mald@tyust.edu.cn

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