无取向电工钢的高温塑性变形流动应力

 以指导无取向电工钢热轧工艺为目的，采用Gleeble 1500热模拟试验机进行高温等温压缩，在应变速率为0.01~10s-1和变形温度500~1200℃条件下，对试样进行试验研究。结果表明：随着变形温度的升高，在回复与再结晶过程中发生α-Fe向γ-Fe相的?洌贾挛忍鞅溆αΤ氏帧耙斐！北浠２捎肁rrhenius关系模型，模型参数能很好的与试验结果相吻合。利用模型分别计算得500~800℃时，应力水平因子α=0.0390MPa-1，应力指数n=7.93，结构因子A=1.9×1018 s-1，热变形激活能Q=334.8kJ/mol；1050~1200℃时，应力水平因子α=0.1258MPa-1，应力指数n=5.29，结构因子A=1.0×1028 s-1，热变形激活能Q=769.9kJ/mol。

Flow Stress of Plastic Deformation for Non-Orientation Electrical Steel Under High Temperature

For the guidance of hot rolling process,the high temperature plastic deformation behavior of non-orientation electrical steel was investigated by Gleeble 1500 thermo-mechanical simulator in the strain rate range of 0.01-10 s-1 and temperature range of 500-1 200 ℃.The results show that: with the increase of deformation temperature,the phase transformation from α-Fe to γ-Fe takes place during the recovery and recrystallization process and causes the steady flow stress exhibits abnormally.The α(stress level factor),n(stress exponent),A(structure factor) and Q(activation energy) of high temperature process of non-orientation electrical steel in different temperature range were calculated by Arrhenius model.During the high temperature plastic deformation process between 500 and 800 ℃,the calculated values of α,n,A and Q are 0.039 0 MPa-1,7.93,1.9×1018 s-1,and 334.8 kJ/mol,respectively.During the high temperature plastic deformation process between 1 050 and 1 200 ℃,the calculated values of α,n,A and Q are 0.125 8 MPa-1,5.29,1.0×1028 s-1,and 769.9 kJ/mol,respectively.