用Arrhenius方程预测F40MnV非调质钢高温流动应力  

Prediction of high temperature flow stress for a microalloyed forging steel F40MnV by Arrhenius-type constitutive model

作　　者：王进[1] 褚忠[1] 张琦[1] 

机构地区：[1]青岛理工大学机械工程学院,山东青岛266033

出　　处：《材料热处理学报》2013年第1期182-186,共5页Transactions of Materials and Heat Treatment

基　　金：山东省自然科学基金(ZR2010EQ027)

摘　　要：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。Isothermal hot compression tests of F40MnV steel were performed on a Gleeble 1500 thermo-mechanical simulator at 950 - 1200 ℃ and strain rate of 0. 1 - 10 s^-1 to obtain the flow stress curves. A constitutive model that was expressed by the hyperbolic laws in an Arrhenius-type equation was established by considering the effect of strain on different material constants. Standard statistical parameters such as correlation coefficient and average absolute relative error were employed to quantify the predictability of the constitutive model. The correlation coefficient and average absolute relative error were found to be 0. 993 and 5.56% ,respectively. The results show that the Arrhenius-type constitutive model by deriving the material constants as polynomial functions of strain can be used to predict the magnitude and tendency of flow stress with the increase of deformation accurately and is applicable for hot forging simulation of F40MnV steel.

关 键 词：F40MnV 非调质钢 流动应力 本构模型 

分 类 号：TG142.4[一般工业技术—材料科学与工程]