Transactions of Materials and Heat Treatment

Title：Constitutive equation and dynamic recrystallization behavior for as-cast Q345E steel

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ClassificationCode：TG115.21；TG142.7

year,vol(issue):pagenumber：2020,45(11):199-204

Abstract：

For as-cast Q345E steel used for manufacturing wind-power flanges, the single-pass thermal compression experiments were conducted by thermal simulation test machine Gleeble-1500D under the deformation temperatures of 950-1250 ℃, the strain rates of 0.001-1 s-1 and the deformation amount of 60%, and the true stress-true strain curves were obtained. Then, the thermal deformation behaviors of material under different deformation conditions were analyzed. The results show that the deformation process of as-cast Q345E steel includes two kinds of softening mechanisms. When the deformation temperature is less than 1000 ℃ and the strain rate is in the range of 0.001-1 s-1 , the flow stress curves show the softening characteristics of dynamic recovery. However, when the deformation temperature is 1100 ℃ or above, the main softening mechanism of material is dynamic recrystallization, and comparing with the peak strain at which the dynamic recrystallization occurs, the peak stress is more sensitive to changes in deformation conditions. Furthermore, according to the Arrhenius hyperbolic sine function, the constitutive equation of as-cast Q345E steel is constructed, the critical strain for dynamic recrystallization is determined, and the kinetic model of dynamic recrystallization is constructed.

Funds：

国家自然科学基金资助项目(51775361)

孔晓寒(1993-)，男，硕士研究生 E-mail：616526863@qq.com；通讯作者：陈慧琴(1968-)，女，博士，教授 E-mail：chenhuiqin@tyust.edu.cn

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