Characterization and the improved Arrhenius model of 0Cr11Ni2MoVNb steel during hot deformation process

2018 International Conference on Advanced Materials, Intelligent Manufacturing and Automation

材料科学;机械制造;运输工程

Fu, Jia^1,2 ; Li, Fuguo^2 ; Li, Yongtang^3

School of Material Science and Engineering, Xi'An Shiyou University, Xi'an

710065, China^1

School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an

710072, China^2

Material Science and Engineering, Taiyuan University of Science and Technology, Taiyuan

030024, China^3

关键词: Correlation coefficient;    Deformation activation energy;    Hot deformation process;    Isothermal compression tests;    Optimizing parameters;    Strain-hardening exponent;    Wide temperature ranges;    Zener-Holloman parameters;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/382/2/022027/pdf
DOI  :  10.1088/1757-899X/382/2/022027

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

True stress versus true strain curves of 0Cr11Ni2MoVNb alloy steel were obtained from isothermal compression tests on Gleeble-1500 tester over a wide temperature range from 1223K to 1433K and a strain rate range from 0.01s-1 to 10s-1. Considering the compensation of strain, the improved Arrhenius model based on Zener-Holloman parameter was evaluated by regression analysis and modified by optimizing parameters of strain hardening exponent as well as the deformation activation energy with a method of five-order polynomial fitting. Then constitutive equation of the flow stress was verified by comparing both the correlation coefficient R and the average absolute relative error (AARE). The main result shows that: (1) the deformation activation energy is insensitive to strain rate under a lower temperature range from 1223K to 1373K; (2) maximum values of the deformation activation energy under various strain degree are concentrated with the temperature over 1373K and the strain rate nearby 0.1s-1. (3) the improved Arrhenius model has a low value level of its parameters R(