Kinetics and Numerical Simulation of Dynamic Recrystallization Behavior of Medium Mn Steel in Hot Working,Steel Research International

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Kinetics and Numerical Simulation of Dynamic Recrystallization Behavior of Medium Mn Steel in Hot Working
Steel Research International ( IF 1.9 ) Pub Date : 2020-04-27 , DOI: 10.1002/srin.201900675
Xiaoyun Sun _{1,

2} , Mei Zhang _{1,

3} , Yang Wang ₁ , Yuyang Sun ₁ , Yunhao Wang ₁

Affiliation

Thermal deformation leads to controllable and effective grain refinement and microstructure optimization in medium Mn steel. To study the appropriate hot deformation parameters, the dynamic recrystallization (DRX) behavior and grain size evolution of medium Mn steel (0.15C‐7Mn) are investigated by thermal‐compression tests. Two types of DRX flow behaviors are observed on the flow curve, that is, single peak and cyclic behaviors. Based on the linear regression of characteristic points, dynamic recovery (DRV) model and DRX model are established. The predicted flow stress using the model established conforms well to experimental results. The correlation coefficient (R) and average absolute relative error (AARE) are 0.99% and 4.95%, confirming the accuracy of the model. After obtaining the value of DRX grain sizes by metallographic observation, grain size evolution model is developed to estimate the microstructure evolution. In addition, the established models are incorporated into DEFORM‐3D to simulate the kinetics and microstructure evolution of DRX. The simulation values are in good agreement with the experimental results, indicating that the finite element method (FEM) is an effective and accurate way for the analysis of thermal compression.

中文翻译：

中锰钢热加工动态再结晶行为的动力学和数值模拟

热变形导致中锰钢中可控且有效的晶粒细化和组织优化。为了研究合适的热变形参数，通过热压缩试验研究了中锰钢（0.15C-7Mn）的动态再结晶行为（DRX）和晶粒尺寸演变。在流动曲线上观察到两种类型的DRX流动行为，即单峰行为和循环行为。基于特征点的线性回归，建立了动态恢复（DRV）模型和DRX模型。使用建立的模型预测的流动应力与实验结果非常吻合。相关系数（R）和平均绝对相对误差（AARE）分别为0.99％和4.95％，证实了该模型的准确性。在通过金相观察获得DRX晶粒尺寸的值之后，建立晶粒尺寸演化模型以估计显微组织的演化。此外，已建立的模型已合并到DEFORM-3D中，以模拟DRX的动力学和微观结构演变。仿真结果与实验结果吻合较好，表明有限元法是一种有效而准确的热压缩分析方法。

更新日期：2020-04-27

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