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500～1 200℃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相的转变,导致稳态流变应力呈现“异常”变化.采用Arrhenius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=0.0390 MPa-1,应力指数n=7.93,结构因子A=1.9×1018s-1,热变形激活能Q=334.8kJ/mol;1050～1200℃时,应力水平因子α=0.125 8 MPa-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=769.9 kJ/mol.
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