Transactions of Materials and Heat Treatment

Title：Thermal deformation behavior and strain-compensated constitutive equation of Q355B steel

Authors： Hou Dong 1 2 Nie Jingkai 1 2 Han Yu 1 2 Chen Guohong3 Liu Xiaosheng1 2 Ji Jun 1 2

Unit： 1.State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. 2.Department of Electrical Engineering New Materials State Grid Smart Grid Research Institute Co. Ltd. 3.State Grid Anhui Electric Power Co. Ltd.

KeyWords： Q355B steel thermal deformation microstructure strain compensated constitutive equation

ClassificationCode：TG142.1; TM201.4

year,vol(issue):pagenumber：2024,49(3):240-250

Abstract：

The isothermal thermal tensile test was conducted by Gleeble-3500 thermal simulation machine, and the thermal deformation behavior and microstructure evolution of Q355B steel at the deformation temperature of 500-1100 ℃ and the strain rate of 0.001-0.1 s-1 were studied to establish the constitutive equation. The results show that the microstructure of Q355B steel is mainly composed of ferrite and pearlite. With the increasing of deformation temperature, the volume fraction of pearlite increases, and the microstructure morphology gradually evolves from low temperature band to medium temperature equiaxed and high temperature widmanstatten morphology. The flow behavior of Q355B steel is sensitive to strain rate and deformation temperature, and its flow stress decreases significantly with the increasing of deformation temperature or the decreasing of strain rate. In addition, the flow stress curve is dynamic recrystallization type at the high temperature of 1100 ℃ and the low strain rates of 0.001 and 0.01 s-1, while it is a dynamic recovery type at low temperature and high strain rate. The Arrhenius hyperbolic sine constitutive equation considering strain compensation has high prediction accuracy and can better fit the flow behavior of Q355B steel under different deformation strains. The correlation coefficients under different deformation conditions are all more than 91%, and the average absolute relative errors are all less than 13.4%.

Funds：

国家电网公司总部科技项目（5500-202158330A-0-0-00）

作者简介：侯东（1990-），男，硕士，工程师，E-mail：hd61140161@163.com

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