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首页> 外文期刊>Journal of Materials Engineering and Performance >Constitutive Modeling of High-Temperature Flow Behavior of an Nb Micro-alloyed Hot Stamping Steel
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Constitutive Modeling of High-Temperature Flow Behavior of an Nb Micro-alloyed Hot Stamping Steel

机译：铌微合金热冲压钢高温流动行为的本构模型

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The thermal deformation behavior and constitutive models of an Nb micro-alloyed 22MnB5 steel were investigated by conducting isothermal uniaxial tensile tests at the temperature range of 873-1223 K with strain rates of 0.1-10 s(-1). The results indicated that the investigated steel showed typical work hardening and dynamic recovery behavior during hot deformation, and the flow stress decreased with a decrease in strain rate and/or an increase in temperature. On the basis of the experimental data, the modified Johnson-Cook (modified JC), modified Norton-Hoff (modified NH), and Arrhenius-type (AT) constitutive models were established for the subject steel. However, the flow stress values predicted by these three models revealed some remarkable deviations from the experimental values for certain experimental conditions. Therefore, a new combined modified Norton-Hoff and Arrhenius-type constitutive model (combined modified NH-AT model), which accurately reflected both the work hardening and dynamic recovery behavior of the subject steel, was developed by introducing the modified parameter k (epsilon). Furthermore, the accuracy of these constitutive models was assessed by the correlation coefficient, the average absolute relative error, and the root mean square error, which indicated that the flow stress values computed by the combined modified NH-AT model were highly consistent with the experimental values (R = 0.998, AARE = 1.63%, RMSE = 3.85 MPa). The result confirmed that the combined modified NH-AT model was suitable for the studied Nb micro-alloyed hot stamping steel. Additionally, the practicability of the new model was also verified using finite element simulations in ANSYS/LS-DYNA, and the results confirmed that the new model was practical and highly accurate.
机译：通过在873-1223 K的温度范围内以0.1-10 s（-1）的应变范围进行等温单轴拉伸试验，研究了Nb微合金22MnB5钢的热变形行为和本构模型。结果表明，所研究的钢在热变形过程中表现出典型的加工硬化和动态恢复行为，流动应力随着应变率的降低和/或温度的升高而降低。根据实验数据，为主题钢建立了改良的Johnson-Cook（改良的JC），改良的Norton-Hoff（改良的NH）和Arrhenius型（AT）本构模型。但是，这三个模型预测的流动应力值显示出在某些实验条件下与实验值有明显的偏差。因此，通过引入修正参数k（ε），开发了一种新的修正的Norton-Hoff和Arrhenius型组合本构模型（修正的NH-AT组合模型），该模型可以准确反映目标钢的加工硬化和动态恢复性能。 ）。此外，通过相关系数，平均绝对相对误差和均方根误差来评估这些本构模型的准确性，这表明组合改进的NH-AT模型计算出的流变应力值与实验值高度一致。值（R = 0.998，AARE = 1.63％，RMSE = 3.85 MPa）。结果证实，组合改进的NH-AT模型适用于所研究的Nb微合金热冲压钢。此外，还通过ANSYS / LS-DYNA中的有限元模拟验证了新模型的实用性，结果证实了该新模型的实用性和准确性。

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