热变形参数对2.25Cr-lMo-0.25V钢动态再结晶的影响

doi:10.13229/j.cnki.jdxbgxb.20230177

摘要/Abstract

摘要：

采用Gleeble-1500D热模拟试验机，通过热压缩实验研究了2.25Cr-lMo-0.25V钢在温度为950~1 200 ℃，应变速率为0.005~0.1 s^-1时的热变形及动态再结晶行为。结果表明：流动应力及动态再结晶都具有显著的温度、应变速率敏感性。通过回归分析确定了临界应变、稳态应变与Zener-Hollomon参数共同表征的动态再结晶状态图，建立了动态再结晶动力学方程和动态再结晶晶粒尺寸模型。本文研究成果为2.25Cr-lMo-0.25V钢热成形工艺参数的合理制订提供了参考数据。

关键词: 金属材料, 2.25Cr-lMo-0.25V钢, 工艺参数, 动态再结晶, 热压缩

Abstract:

Hot compression test for 2.25Cr-lMo-0.25V steel was carried out at the temperature of 950-1 200 ℃ and strain rate of 0.005-0.1 s^-1 on Gleeble-1500D thermal simulator. Hot deformation behavior and dynamic recrystallization of this steel were systematically investigated. The flow stress and microstructure state were strongly depended on temperature and strain rate. The relationship between Zener-Hollomon parameter and the characteristic strain （critical strain and steady strain） was determined by linear fitting， and a dynamical recrystallization state diagram was established. The dynamical recrystallization kinematic equation of this steel and the model of complete dynamic recrystallization grain size were established based on experimental data and the stress-strain curves. The results could provide a theoretical basis for formulating reasonable hot working process.

Key words: metallic material, 2.25Cr-lMo-0.25V steel, processing parameters, dynamic recrystallization, hot compression

安红萍,武建国. 热变形参数对2.25Cr-lMo-0.25V钢动态再结晶的影响[J]. 吉林大学学报(工学版), 2024, 54(12): 3460-3467.

Hong-ping AN,Jian-guo WU. Effect of thermo-mechanical processing parameters on dynamic recrystallization of 2.25Cr-lMo-0.25V Steel[J]. Journal of Jilin University(Engineering and Technology Edition), 2024, 54(12): 3460-3467.

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