基于修正Johnson-Cook本构模型的2209双相不锈钢高温流变行为

High temperature rheological behavior of 2209 duplex stainless steel based on modified Johnson-Cook constructive model

利用Gleeble-3800热模拟实验机,对2209双相不锈钢进行了单向热压缩实验,应变速率为0.01~10 s^(-1),变形温度为950~1150℃。研究了2209双相不锈钢的高温流变行为,分析了应变速率和变形温度对双相不锈钢两相关系的影响,并对2209双相不锈钢在宽应变速率和宽变形温度下的Johnson-Cook本构模型进行了修正。结果表明:变形温度与应变速率对2209双相不锈钢的流动应力有显著影响,修正后的Johnson-Cook本构模型能较为精确地预测其高温流变行为,预测值与实验值的相关度为0.99817,平均相对误差为4.026%。

The unidirectional thermal compression expriment of 2209 duplex stainless steel was conducted at the strain rate of 0.01-10 s^(-1) and the deformation temperature of 950-1150℃by thermal simulation machine Gleeble-3800,and the high temperature rheological behavior of 2209 duplex stainless steel was studied.Then,the influences of strain rate and deformation temperature on the two phases relationship of 2209 duplex stainless steel were analyzed,and the Johnson-Cook constitutive model of 2209 duplex stainless steel at wide strain rate and wide deformation temperature was modified.The results show that the deformation temperature and strain rate have a significant effect on the rheological stress of 2209 duplex stainless steel.The modified Johnson-Cook constitutive model can accurately predict its high temperature rheological behavior.The correlation between the predicted and experimental values is 0.99817,and the average relative error is 4.026%.