HRB600E Construction of Critical Conditions and Kinetic Models for Dynamic Recrystallization
Thermal simulation compression experiments were carried out on Gleeble-3500 HRB600E high-strength seismic reinforcement,and the dynamic recrystallization behavior of high-strength seismic steel bars under the conditions of deformation temperature of 850~1 000℃,strain rate of 0.01~10 s-1 and maximum deformation of 60%was studied.Using the hyperbolic sinusoidal Arrhenius relation HRB600E the activation energy of the deformation of the high-strength seismic reinforcement is 232 kJ/mol.The initial critical stress and strain of dynamic recrystallization obtained by the work hardening principle and the Cingara-McQueen rheological stress model are more consistent,and the critical stress value obtained by the Cingara-McQueen rheological stress model is higher,and the relationship between the critical stress-strain and the Z parameter is εc=0.0016Z0.18 and σc=1.16Z0.166 by introducing the Z parameters.Based on the dynamic recrystallization kinetic model and recrystallization volume fraction optimized by Avrami etal.,the dynamic recrystallization kinetic equation is obtained,and the dynamic recrystallization fraction under different conditions is calculated by the equation,and compared with the experimental values,it is found that the two have a high agreement.
HRB600Edynamic recrystallizationcritical strainmaximum softening rateactivation energy