Mathematical Temperature Field Model about As-cast AZ31B Magnesium Alloy during Hot Rolling of Plate

High temperature compression tests of as-cast magnesium alloy AZ31B cylindrical samples were preformed under the condition of deformation temperature 250450 degrees C and strain rate 0.005 similar to 5 s(-1) using Gleeble-1500D thermal/mechanical simulation testing machine. Based on the high precision flow stress models and the rigid-plastic finite element analysis software, numerical analysis of coupled thermal-stress of hot rolling process of different initial rolling temperatures, different rolling reductions and different rolling speeds was also carried on. Under different conditions, models of temperature field of different magnesium plate deformation regions were established by mathematical analysis methods. The results show that under different conditions of hot rolling processes and rolling zones, regional distribution of rolling deformation temperature is so different that mathematical models of temperature field should be divided into different process conditions to establish. The mechanism of temperature controlled online is simple by mathematical equations to characterize the magnesium alloy heat transfer process and the heat transfer mechanism of magnesium plate rolling in wide ranges is accurately characterized.