锻压技术

V-Nb 微合金化Q420B大规格角钢高温流变应力研究

英文标题：Study on high temperature flow stress of V-Nb microalloying Q420B angle steel with large size

单位：1.华北理工大学冶金与能源学院 2.唐山中厚板材有限公司 3.中信金属宁波能源有限公司

分类号：TG142.1

出版年,卷(期):页码：2024,49(4):226-234

摘要：

为获得大规格角钢高温变形时的流变应力，在Gleeble-3500热模拟实验机上，对V-Nb微合金化Q420B大规格角钢进行了高温单轴压缩实验，变形温度为750~1100 ℃，应变速率为0.1~30 s-1。结果表明，一定实验条件下，当变形温度升高时，实验钢的高温流变应力会随之呈指数函数关系增大；当应变速率的增大时，实验钢的高温流变应力会随之呈幂函数关系增大；随着应变量的增加，实验钢的高温流变应力先增大而后逐渐达到稳定。根据高温流变应力与变形温度、应变速率以及应变的关系，构建了V-Nb微合金化实验钢的高温流变应力本构方程，计算值与实测值具有较好的拟合精度，证明了其可用于实际生产中轧制力的计算。

To obtain the flow stress of large size angle steel during high temperature deformation, the high temperature uniaxial compression experiment of V-Nb microalloying Q420B angle steel with large size were conducted with the deformation temperature of 750-1100 ℃ and the strain rate of 0.01-30 s-1 on a Gleeble-3500 thermal simulation experiment machine. The results show that under the certain experimental conditions, the high temperature flow stress of the experimental steel increases exponentially with the increasing of deformation temperature, and the high temperature flow stress of the experimental steel increases in a power function with the increasing of strain rate.As the strain amount increases, and the high temperature flow stress of the experimental steel first increases and then gradually reaches stability. Based on the relationship between high temperature flow stress and deformation temperature, strain rate and strain, a high temperature flow stress constitutive equation for V-Nb microalloying experimental steel was constructed. The calculated values have good fitting accuracy with the measured values, which proves that it can be used to calculate the rolling force in the actual production.

基金项目：

国家自然科学基金资助项目（51974134）；河北省自然科学基金资助项目（E2022209070）；河北省中央引导地方科技发展资金项目（236Z1003G）；河北省科技重大专项项目（21281008Z）

作者简介：张明赫（1988-），男，博士，副教授 E-mail：mhzhangmse@163.com 通信作者：冯运莉（1966-），女，博士，教授 E-mail：tsfengyl@163.com

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