Transactions of Materials and Heat Treatment

Title：Thermal deformation behavior on new medium alloy ultra-high strength steel

Authors： Ning Jing1 Wang Ao1 Su Jie1 Cheng Xingwang2

Unit： 1.Institute for Special Steels Central Iron and Steel Research Institute 2.School of Materials Beijing Institute of Technology

KeyWords： ultra-high strength steel thermal deformation constitutive equation thermal processing map recrystallization

ClassificationCode：TG142.41

year,vol(issue):pagenumber：2022,47(12):234-239

Abstract：

The hot deformation behavior of new medium alloy ultra-high strength steel containing W, Mo and other carbide formers was studied by Gleeble-3800 thermal simulator under the deformation temperature of 800 ℃-1200 ℃, the strain rate of 0.01-10 s-1, and the maximum strain of 0.7, the rheological stress curves at high temperature of test steel were obtained, which showed that the deformation resistance of test steel increased with the decreasing of deformation temperature and the increasing of deformation rate. When the test steel was hot compressed at a deformation temperature above 1000 ℃, it underwent dynamic recrystallization, and the grain coarsening and secondary recrystallization were promoted by increasing the deformation temperature, while the grain refinement and homogenization of recrystallized grains were promoted beneficially by increasing the deformation rate. According to the rheological stress curve at high temperature of test steel, the hot processing constitutive equation of test steel was calculated, and the hot processing diagram with the true strain of 0.4 was established. Combined with the analysis result of microstructure evolution, the optimum hot processing area of test steel is that the deformation temperature is 1000-1100 ℃ and the strain rate is 1-10 s-1.

Funds：

宁静（1988-），女，硕士，高级工程师 E-mail：ningjing@nercast.com

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