Constitutive analysis and finite element simulation of high-strength rebar during hot compression process
YAN Dong-xu1, FANG Shi-nian2, PU Chun-lei2, DING Han-lin1, ZHU Guo-hui3
1. School of Iron and Steel, Soochow University, Suzhou 215006, Jiangsu, China; 2. Department of Intelligent Development, MCC Huatian Engineering and Technology Corporation, Nanjing 210019, Jiangsu, China; 3. School of Metallurgical Engineering, Anhui University of Technology, Maanshan 243002, Anhui, China
Abstract：Abstract: In order to study the hot deformation behavior of Nb/V microalloyed steel bars, the uniaxial hot compressions experiment of Nb and Nb/V microalloyed 20MnSi steel were carried out by Gleeble-3500 thermal simulator. Based on the true stress-strain curve under different deformation conditions(temperature and strain rate), the constitutive equation that can characterize the relationship between stress, strain, strain rate and temperature of 20MnSiNb and 20MnSiNbV steels were established, and the constitutive equation was applied to the material module of the finite element software DEFORM 3D to simulate the hot compression process of experimental steels. Research shows that the hot compression deformation process of the two alloys exhibits obvious dynamic recrystallization characteristics, and the addition of Nb or Nb/V microalloying elements leads to an increase in the hot deformation activation energy of 20MnSi steel. The simulation results show that there is an uneven distribution of the strain field and temperature field in the compressed sample. The core of the compressed sample is always in a state of high strain, high strain rate and high deformation temperature relative to other regions. In actual production and research, the prediction of the structure and performance for different regions of the sample should refer to the simulation results and explore separately.
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2021, Vol. 31 
