Transactions of Materials and Heat Treatment

Title：High temperature hot deformation behavior and microstructure of 300M ultra-high strength steel

Authors： Xu Yuqian

Unit： College of Metallurgical Engineering Anhui University of Technology Ma′anshan 243000 China

KeyWords： 300M ultra-high strength steel hot deformation behavior constitutive equations dynamic recrystallization rheological stress

ClassificationCode：TG142

year,vol(issue):pagenumber：2025,50(6):221-233

Abstract：

The hot compression experiments of 300M ultra-high strength steel was conducted on the Gleeble-3800 thermal simulation experimental machine at the deformation temperature of 950-1050 ℃ and the strain rate of 0.01-0.1 s-1. Then, based on the dynamic material model, the strain compensation constitutive equation was established, and the hot deformation behavior of experimental steel at high temperatures was studied. Furthermore, the microstructure evolution laws of ultra-high strength steel under different deformation conditions were studied by electron backscatter diffraction technology combined with ARPGE crystallographic analysis software. The results indicate that within the experimental temperature range, the increase in temperature reduces dislocation density by promoting dynamic recovery, resulting in a decrease in the rheological stress. While the increase in strain rate leads to an increase in geometrically necessary dislocation density, resulting in an increase in the rheological stress. Crystallographic analysis reveals that the martensite variants exhibit significant orientation preference characteristics under coordinated plastic deformation mode. In addition, the hot deformation activation energy of 300M ultra-high strength steel is 353.37 kJ·mol-1, the correlation coefficient of the established constitutive equation reaches 0.99703, and the average relative error is only 1.80%, indicating that the equation can effectively predict the rheological stress under different deformation conditions.

Funds：

作者简介：许瑜倩（2004-），女，本科生，E-mail：18434464504@163.com

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