【摘要】 采用Gleeble-3800热模拟实验机对F35MnVN非调质钢在温度范围为950～1 200℃,应变速率范围为0.01～5 s-1进行等温、等应变速率压缩变形.依据所获得的流动应力曲线,拟合获得中间参数表达式,分别获得动态回复-动态再结晶型和Arrhenius方程型两种本构模型.分别统计计算两种模型的预测值与实验值之间的相关系数和相对误差,表明Arrhenius方程型本构模型具有更高的精度,且该模型形式简单,更适合用于F35MnVN钢热锻造过程的数值模拟.更多还原

【Abstract】 Isothermal hot compression tests of F35MnVN steel were performed on a Gleeble-3800 thermo-mechanical simulator in the temperature of 950~1 200 ℃ and the strain rate range of 0.1~10 s-1 to obatin the flow stress curves.Dynamic recorvery and dynamic recrystallization-type and Arrhenius-type constitutive models were established respectively.Standrad statistical parameters such as as correlation coefficient and avergae absolute relative error were employed to quantify the predictability of the two models.The calculation results indicate the Arrhenius-type constitutive model has high accuracy and suits to be used in hot foring simulation for F35MnVN steel.更多还原