Transactions of Materials and Heat Treatment

Title：Hot deformation behaviors and physical constitutive equation of microalloyed high-strength steel

Authors： Wei Hailian Zhou Hongwei Pan Hongbo

Unit： Anhui University of Technology Key Laboratory of Metallurgical Emission Reduction and Resources Recycling of Ministry of Education

KeyWords： microalloyed high-strength steel hot deformation rheological stress dynamic recrystallization physical constitutive equation

ClassificationCode：TG142

year,vol(issue):pagenumber：2022,47(5):217-225

Abstract：

The rheological stress curves of microalloyed high-strength steel were obtained by hot compression experiment with thermal simulator Gleeble-1500 under the conditions for deformation temperature of 900-1100 ℃ and strain rate of 0.01-30 s-1, and the dynamic recrystallization behavior of the high-strength steel was analyzed. Then, a rheological stress prediction models for the strain compensation of the experimental steel were established by adapting the physical constitutive equations considering the absolute temperature dependence of Young′s modulus E and austenite self-diffusion coefficient D with variable stress exponent n and creep stress exponent of 5, respectively. The results show that with the increasing of deformation temperature and the decreasing of strain rate, the dynamic recrystallization is more likely to occur, and the accuracy of predicting rheological stress using the strain-compensated physical constitutive equation is relatively high. And the prediction accuracy of the physical constitutive equation with the variable stress exponent n (correlation coefficient R=0.991, average relative error δ=4.81%) is higher than that of the physical constitutive equation with the creep stress exponent of 5 (correlation coefficient R=0.989, average relative error δ=6.49%). This is because that when the creep stress exponent in the physical constitutive equation is 5, the deformation mechanism of the material is only slip and climb, but the physical constitutive equation with the variable stress exponent n considers all the deformation mechanisms comprehensively, so the prediction accuracy is higher.

Funds：

国家自然科学基金资助项目（51774006、U1860105）；安徽省自然科学基金资助项目（2008085QE279）；先进金属材料绿色制备与表面技术教育部重点实验室主任基金资助项目（GFST2022ZR05）

作者简介：魏海莲（1988-），女，博士，讲师，E-mail：whl0403@126.com；通信作者：潘红波（1978-），男，博士，教授，E-mail：20130007@ahut.edu.cn

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