Open AccessEstablishment of a two-stage constitutive model based on dislocation density theory for as-forged SA508 Gr.3Cl.1
Author(s) -
Jing Ma,
Jiansheng Liu,
Zhenghong Guo
Publication year - 2020
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/ab7071
Subject(s) - materials science , flow stress , isothermal process , deformation (meteorology) , constitutive equation , dynamic recrystallization , strain rate , finite element method , compression (physics) , composite material , hardening (computing) , dislocation , stress (linguistics) , structural engineering , mechanics , thermodynamics , hot working , microstructure , physics , engineering , layer (electronics) , linguistics , philosophy
The high-temperature deformation behavior of the SA508 Gr.3Cl.1 steel was investigated by the uniaxial isothermal compression tests at the deformation temperature from 1223 K to 1473 K and strain rate from 0.001s −1 to 1 s −1 , which were carried out using Gleeble-1500 thermo-mechanical simulator. Based on the experimental data, the material parameters and active energy of hot deformation were determined according to the regression analysis method. The critical strain of dynamic recrystallization (DRX) was confirmed by simplified P-J method. Furthermore, the constitutive model for work hardening-dynamic recovery (WH-DRV) stage and DRX stage was established based on dislocation density theory and the kinetics of DRX. Finally, the flow stress calculated using the established model and experiment data was compared and the results showed that it is enough accurate to predict the flow stress during hot deformation for SA508 Gr.3Cl.1. Thus, the model will be beneficial for the accuracy of simulation by Finite Element Method (FEM) method.