Dynamic Recrystallization Behavior of Nitrogen-Controlled 304 Stainless Steel in Hot Deformation

doi:10.7652/xjtuxb202103017

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Dynamic Recrystallization Behavior of Nitrogen-Controlled 304 Stainless Steel in Hot Deformation

更新时间：2025-07-09

- Dynamic Recrystallization Behavior of Nitrogen-Controlled 304 Stainless Steel in Hot Deformation
- Vol. 55, Issue 3, Pages: 145-154(2021)
- 作者机构：
  
  西安交通大学金属材料强度国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202103017
  CLC： TG111.7
- Online First：10 March 2021，
  
  Published：2021
- 稿件说明：
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Dynamic Recrystallization Behavior of Nitrogen-Controlled 304 Stainless Steel in Hot Deformation[J]. 2021, 55(3): 145-154.
DOI：

Dynamic Recrystallization Behavior of Nitrogen-Controlled 304 Stainless Steel in Hot Deformation[J]. 2021, 55(3): 145-154. DOI： 10.7652/xjtuxb202103017.

摘要

为优化控氮304不锈钢热成型的工艺

深入分析了其在热变形过程中的动态再结晶行为并建立了完整的数学模型。通过热压缩实验获得了16组不同温度、不同应变速率下的流动应力曲线

采用二次求导法确定了发生动态再结晶的临界应力σ

、饱和应力σ

、稳态应力σ

等特征值

结合相应的显微组织分析表明:随着变形温度的升高、应变速率的减小

动态再结晶易发生。基于Estrin-Mecking位错密度演化方程及Avrami动力学方程

建立了该材料的热变形流动应力模型及动态再结晶动力学模型

模型预测的流动应力曲线与实验结果吻合较好

动力学模型预测的动态再结晶分数曲线也与实验观察到的晶粒组织变化趋势一致

证明了该数学模型的有效性。

Abstract

To adjust the dynamic recrystallization related parameters for the hot rolling process of nitrogen-controlled 304 stainless steel

the material was subjected to hot compression experiments at different temperatures and strain rates. The results showed that as the temperature increases and the strain rate decreases

the dynamic recrystallization behavior is more likely to occur. The critical stress σ

saturation stress σ

steady-state stress σ

and other characteristic values for dynamic recrystallization are determined by the second derivative of the stress-strain curve. Based on this parameters

the dislocation density evolution equation and Avrami kinetic equation are introduced

and the thermal deformation flow stress

model and dynamic recrystallization kinetic model of the material are established. The calculated values of the hot deformation flow stress model are in good agreement with the experimental values. The dynamic recrystallization fraction curve obtained by kinetics model is consistent with the change trend of the grain structure observed in the experiment.

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