锻压技术

高强建筑用低温钢的高温变形行为

英文标题：High temperature deformation behavior of low temperature steel for high strength building

作者：焦丽君张书娜何宇罗凤鸣

分类号：TG454

出版年,卷(期):页码：2019,44(10):184-190

摘要：

采用Gleeble 3800热模拟试验机，对高强低温建筑用钢在850~1200 ℃时进行了热压缩变形，分析了低温钢的高温组织演变和动态再结晶行为，建立了低温钢的高温压缩本构方程。结果表明，变形温度850~1200 ℃时低温钢的应力-应变曲线中都没有明显流变应力峰值，且随着变形温度升高，相同应变下低温钢的流变应力呈现逐渐减小，具有动态回复的流变曲线特征；随着变形温度的增加，低温钢中长条状奥氏体晶粒逐渐转化为细小等轴晶，在变形温度高于1100 ℃时低温钢中等轴晶晶粒会发生粗化与长大；低温钢的高温变形本构方程可表示为：Z=4exp(341970/RT)=7.8073σ7.9751p。随着变形温度从850 ℃上升至1000 ℃，低温钢中纳米级V(C,N)相尺寸不断增大、数量不断减少，纳米级V(C,N)相可以有效抑制低温钢中动态再结晶的发生。

The hot compression deformation of steels used by low temperature and high strength building was conducted at 850-1200 ℃ by Gleeble 3800 thermal simulator, the evolution of high temperature structure and dynamic recrystallization behavior of low temperature steels were analyzed, and the constitutive equation of high temperature compression for low temperature steels was established. The results show that there is no obvious peak value of rheological stress in the stress-strain curves of low temperature steel at the deformation temperature of 850-1200 ℃. With the increase of deformation temperature, the rheological stress of low temperature steel under the same strain decreases gradually, and it has the characteristics of dynamic recovery rheological curve. However, with the increase of deformation temperature, the long austenite grains in low temperature steel gradually transform into fine equiaxed grains, and the coarsening and growth of

equiaxed grains occur when the deformation temperature is higher than 1100 ℃. Therefore, the constitutive equation of high-temperature deformation for low temperature steels can be expressed as follows: Z=4exp(341970/RT)=7.8073σ7.9751p. Thus, with the increase of deformation temperature from 850 ℃ to 1000 ℃, the size of nano-V(C, N) phase in low temperature steel increases, the number of nano-V(C, N) phase decreases, and nano-V (C, N) phase can effectively inhibit the occurrence of dynamic recrystallization in low temperature steel.

基金项目：

国家自然科学基金资助项目（51234012）

作者简介：焦丽君（1986-），女，硕士，讲师 E-mail：lijunjiaoo48@sina.com

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