Study on High-temperature Mechanical Properties and Thermodynamics of C-Mn-Cr Cold-rolled Hot-galvanize Dual Phase Steel
By Thermo-Calc software calculation and compressing cylinder samples on Gleeble-3800 thermal analog test machine,the high-temperature mechanical properties and thermodynamics of C-Mn-Cr cold-rolled hot-galvanize dual phase steel were studied.The results show that the thermal deformation resistance rises with the increase of the thermal deformation rate and amount,and falls with the increase of deformation temperature,and the state slackens at higher temperature or higher deformation rate.Besides,the activity of C changes significantly with the ferrite trans-formation.And the activity of Fe increases with the decrease of temperature,while it is not obvious on Si,Mn and Cr.Moreover,the grain boundary energy and dislocation energy are changed by hot deformation,which promotes the diffusion of cementite and M7C3 phase at different temperature.As a result,the rearrangement process of phase composition is accelerated.