Transactions of Materials and Heat Treatment

Title：Thermal constitutive equation and thermal processing map on GE1014 steel based on friction correction

Authors： Lian Xuekui Han Shun Liu Yue Li Yong Wang Chunxu Wang Maoqiu

Unit： Central Iron and Steel Research Institute Co. Ltd.

KeyWords： GE1014 steel high temperature rheological curve correction dynamically recrystallized constitutive equation thermal processing map

ClassificationCode：TG142.1

year,vol(issue):pagenumber：2023,48(3):219-226

Abstract：

The high temperature axial compression test was conducted on GE1014 steel under the conditions of the thermal deformation temperature of 850-1250 ℃, the strain rate of 0.01-10 s-1 and the deformation amount of 0.7, and the rheological curves were modified by friction correction. Then, the thermal constitutive equation and Z parameter formula of GE1014 steel were established, and the thermal processing map of GE1014 steel was established based on the theory of dynamic material model. Finally, the accuracy of thermal processing map and the optimum thermal deformation zone were confirmed by analyzing the microstructure of the material after deformation. The results show that friction effect significantly affects the high temperature rheological curve of GE1014 steel at low deformation temperature or high strain rate, and the thermal deformation activation energy of GE1014 steel after fiction correction is calculated as 400.197 kJ·mol-1. When the true strain of the test steel is 0.4 and 0.7 respectively, the maximum energy dissipation efficiency η under the high temperature and low strain rate reaches the maximum of 0.34. Comprehensively analyzing the thermal processing map and the microstructure of the test steel, it is determined that the GE1014 steel under the deformation temperature of 1100-1150 ℃ and the strain rate of 0.1 s-1 can obtain the uniform and fine fully dynamically recrystallized structure, and the thermal workability of GE1014 steel is the best at this time.

Funds：

作者简介：廉学魁（1984-），男，博士研究生 E-mail：lxk-84@163.com 通信作者：韩顺（1987-），男，博士，高级工程师 E-mail：hanshunfa@126.com

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