Study Of Resistance Of Deformation Of Non-oriented Silicon Steel50A470and50A1300

The deformation resistance model (sometimes referred to as the flow stress model,constitutive relation) which describes the relation between mechanical properties ofmetallic material and thermal deformation parameters is widely applied to the real-timecontrol rolling process, forging control technology and finite element numericalsimulation. Two kinds of silicon steel50A1300and50A470provided by Baosteel2050hot rolling factory are used. Thermal expansion test and compression test were carriedon the Gleeble-1500D thermal simulation testing machine.CCT curves of the two steels measured by the method of thermal expansion areobtained and then the phase transition temperature of the two steels is gained. Thetemperature range of the compression test is determined according to the phasetransition temperature. The results show that: the austenite and ferrite two-phasecoexistence region of the50A470silicon steel is within the range from850℃to950℃,and phase change does not occur during the compression temperature range of thesilicon steel50A1300. The deformation resistance of the material increases as the strainincreases; as the strain rate increases, the deformation resistance increases significantlyduring the hot deformation; the greater the strain rate is, the greater the peak strain is.For silicon steel50A470in the range of700℃to885℃, the peak stress is reduced withincreasing temperature; in the range of885℃to965℃, peak stress increased withincreasing temperature; in the range of965℃to1200℃, the peak stress is reduced as.For the silicon steel50A1300, the peak stress is decreasing as the temperature riseswithin the deformation temperature.On the basis of analysis of the influence of deformation temperature, strain rate andthe amount of deformation on the deformation resistance, the mathematical model of thedeformation resistance of both steels is established. Combined with Origin Pro, Matlab,1stOpt software, firstly, a peak stress model of two steels in the austenitic state of isestablished, then the deformation resistance model of two steels in the austenitic state is bulit, and finally the deformation resistance model of silicon steel50A470in thetwo-phase region and ferritic-phase region is established. The comparison ofexperimental and calculated values shows that the accuracy of the model is high.