锻压技术

2.25Cr1Mo0.25V钢高温变形微观组织的演变分析与数值模拟

英文标题：Microstructural evolution and numerical simulation of 2.25Cr1Mo0.25Valloy steel during hot deformation

关键词：2.25Cr1Mo0.25V钢高温流变行为动态再结晶数学模型

分类号：

出版年,卷(期):页码：2015,40(1):148-153

摘要：

在Gleeble-3500热模拟试验机上对2.25Cr1Mo0.25V钢进行等温压缩试验，得到变形温度在900～1200 ℃、应变速率在0.001～10 s-1、变形量为60%时的高温流动应力-应变曲线。结合金相实验，研究2.25Cr1Mo0.25V钢在不同变形条件下微观组织的演变规律，建立2.25Cr1Mo0.25V钢在高温塑性变形过程中的动态再结晶数学模型。将模型与有限元结合，对热压缩过程的组织演化进行数值模拟，模拟结果与试验结果的相对误差小于11%，验证了模型的正确性。

Isothermal compressive experiments of 2.25Cr1Mo0.25V steel were carried out with hot-simulation machine of Gleeble -3500. High temperature flow stress-strain curves were gained over the range of deformation temperature from 900 to 1200 ℃, strain rate from 0.001 to 10 s-1 and 60% deformation degree. In addition, microstructural evolution of 2.25Cr1Mo0.25V steel under different deformation conditions was researched by both metallurgical tests and flow stress-strain curves and mathematical model of dynamic recrystallization of 2.25Cr1Mo0.25V steel was established during hot temperature plastic deformation. By combining the microstructure model with finite element method, the microstructural evolution was simulated during isothermal compressive deformation. The relative error is smaller than 11% by comparing the results of simulation and experiment. The correctness of model was tested.

基金项目：

国家科技重大专项（2011ZX04002-101-002）

黄西娜（1987－），女，硕士研究生

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