【摘要】 针对电站大口径厚壁无缝管典型用钢T/P91(10Cr9Mo1VNb),利用Gleeble-3500热模拟试验机采集了T/P91耐热钢的高温流动应力-应变曲线。以Avrami方程为基础,结合单项热压缩实验发生完全动态再结晶试样的金相分析,回归得到方程中的模型参数,从而确立P91合金钢在不同变形条件下的动态再结晶数学模型。采用De-form数值模拟软件对热模拟实验动态再结晶过程进行数值模拟,对比金相实验结果,验证P91合金钢动态再结晶数学模型的正确性。更多还原

【Abstract】 Based on the T/P91(10Cr9Mo1VNb) steel which is the typical material of the large-diameter seamless steel tube with thick wall,by using the Gleeble-3500 thermal simulation test enginery,the flow stress and strain curve of heat resistant T/P91 steel in the high temperature were collected.Taking Avrami equation as the foundation,combined with the metallographic analysis to the samples occurred fully dynamic recrystallization during the hot compression experiment,the parameters of Avrami equation was established by the linear regression method.The P91 mathematical model of dynamic recrystallization in the different deformation conditions was validated.In order to validate the correctness of P91 steel alloy dynamic recrystallization mathematical model,the results of the numerical simulation about hot compress experiences were adopted and Deform software was used through comparing with metallographic experiment.更多还原