采用Gleeble 1500热模拟实验机对F40MnV非调质钢在温度为950 ～1250℃、应变速率为0.1～ 10 s-1范围内进行了等温、等应变速率热压缩实验.依据实验的流动应力曲线,将材料参数表示为应变的函数,采用双曲正弦形式的Arrhenius方程建立了该种钢的高温本构模型.统计计算了模型预测流动应力和实验值之间的相关系数和平均相对误差分别为0.993和5.56％.结果表明:在实验温度和应变速率范围内,双曲正弦形式Arrhenius方程中材料参数可以表示为应变的多项式函数,该方程能够较为准确预测材料高温流动应力随变形量增加而变化的大小和趋势,适用于该种钢热锻造过程的数值模拟.
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