Transactions of Materials and Heat Treatment

Title：High temperature deformation behavior of low temperature steel for high strength building

Authors： Jiao Lijun Zhang Shuna He Yu Luo Fengming

Unit： 1.Department of Architecture and Civil Engineering Xingtai Polytechnic College 2. Technology Center HBIS Group Tang Steel Company

KeyWords： low temperature steel high temperature deformation microstructure constitutive equation dynamic recrystallization

ClassificationCode：TG454

year,vol(issue):pagenumber：2019,44(10):184-190

Abstract：

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.

Funds：

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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