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为研究X70HD抗大变形管线钢的亚动态再结晶行为,利用Gleeble-3500热-力模拟试验机进行了X70HD管线钢不同道次间隔保温时间、变形速率和变形温度条件下的双道次热压缩实验。实验结果表明:道次间隔保温时间越长,材料软化程度越大。随着变形速率增大、变形温度提高,亚动态再结晶体积分数升高。基于实验结果建立了X70HD管线钢的亚动态再结晶动力学模型,并通过与实验数据进行对比验证了模型具有较高的精确度。获得的亚动态再结晶动力学模型为进一步对X70HD管线钢实际轧制生产中组织的变化进行模拟、预测和控制、优化轧制工艺以及提高产品性能提供了理论基础和数据参考。
In order to study the sub-dynamic recrystallization behavior of X70HD heavy deformation pipeline steel, the Gleeble-3500 thermal-mechanical simulator was used to simulate the double-pass thermal compression of X70HD pipeline steel with different pass spacing time, deformation rate and deformation temperature experiment. The experimental results show that: the longer the interval of insulation, the greater the degree of material softening. As the deformation rate increases, the deformation temperature increases and the sub-dynamic recrystallization volume fraction increases. Based on the experimental results, the sub-dynamic recrystallization kinetics model of X70HD pipeline steel was established and compared with the experimental data to verify the model with high accuracy. The obtained sub-dynamic recrystallization kinetics model provides a theoretical basis and data reference for further simulating, predicting and controlling the changes of the structure during the actual rolling production of X70HD pipeline steel, optimizing the rolling process and improving the product performance.