Hot Compression Deformation Behavior and Rheological Model of Flow Stress of Q345B Structural Steel

The high tempeture single-pass compression experiment was carried out with Gleeble-1500D thermal simulator for V-Ti-Nb microalloyed Q345B steel(HSLA).The deformation behaviors of this steel was measured under different deformation temperatures and deformation rates,and the influence of process parameters on the dynamic recrystallization and deformation resistance was investigated.The value of Qdef was 451.47kJ/mol.The rheological model of segmented function of high temperature deformation resistance was established.The calculated results by the rheological model were in good agreement with experiments.