Abstract：In order to optimize the hot-rolling production process parameters of the martensitic heat-resistant steel 40Cr10Si2Mo and establish digital design and intelligent system database for wire and bar rolling, the constitutive equation of the strain compensation and the dynamic recrystallization behavior of martensitic heat resistant steel 40Cr10Si2Mo at temperatures ranging from 900 to 1 100 ℃ and stain rates from 0.1 to 20 s-1were studied by single-pass compression tests carried out on Gleeble-3500 thermo-mechanical simulator,which can provide theoretical basis for the plastic deformation behavior and optimizing microstructure of 40Cr10Si2Mo steel. The results show that the stress decreases with the increase of deformation temperature and increases with the increase of strain rate. The effect of temperature and strain rate on thermal deformation resistance (true stress) is mainly determined by the interaction of work hardening, dynamic recovery, recrystallization and other softening mechanisms that occur inside the metal during the plastic deformation process. A constitutive model of Arrhenius was established. The correlation (R2) and the average relative error (AARE) are 0.983 97 and 4.531% respectively between the predicted value of the proposed model and the experimental results. The method of fourth order polynomial fitting and derivation to the σ-ε curves were used to analyse the softening process of 40Cr10Si2Mo steel and the critical conditions of dynamic recrystallization at different deformation conditions. The relationship between the critical condition of dynamic recrystallization and the value of lnZ (Zener-Hollomon parameter) was described. When the lnZ value was less than 63,the critical strain of dynamic recrystallization increased with the increase of the lnZ value. When the lnZ value was greater than 63,the critical strain of dynamic recrystallization did not change significantly with the increase of the lnZ value. Through comparing the microstructure of 40Cr10Si2Mo steel,it was found that the grains swallowed each other and merged, and some of the recrystallized grains did not grow up under the conditions of 1 100 ℃/0.1 s-1,which eventually led to the appearance of mixed crystal structure. However,increasing the strain rate was beneficial to refine the dynamic recrystallization grains.
王庆娟, 王钦仁, 杜忠泽, 何泽恩, 党雪, 齐泽江. 40Cr10Si2Mo钢的热变形模型及动态再结晶行为[J]. 钢铁, 2021, 56(11): 112-121.
WANG Qing-juan, WANG Qin-ren, DU Zhong-ze, HE Ze-en, DANG Xue, QI Ze-jiang. Hot deformation model and dynamic recrystallization behavior of 40Cr10Si2Mo steel[J]. Iron and Steel, 2021, 56(11): 112-121.
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