锻压技术

40CrNi4Mo1V钢动态再结晶行为

英文标题：Dynamic recrystallization behavior of 40CrNi4Mo1V steel

单位：1. 北京科技大学材料科学与工程学院 2. 中国机械总院集团北京机电研究所有限公司

关键词：40CrNi4Mo1V钢热压缩实验真应力-真应变曲线热变形激活能动态再结晶体积分数

分类号：TG142.1

出版年,卷(期):页码：2025,50(3):77-88

摘要：

利用Gleeble-1500热模拟试验机对挤压态和电渣态的40CrNi4Mo1V钢进行热压缩实验，测定其真应力-真应变曲线，系统研究应变速率为0.01～10 s-1、温度为1050～1250 ℃和变形量为60%条件下的动态再结晶行为，并基于改进的Avrami方程建立动态再结晶动力学模型。结果表明，高温低应变速率下，该钢动态再结晶现象显著。通过线性回归计算，挤压态和电渣态40CrNi4Mo1V钢的热变形激活能分别为511.11和493.35 kJ·mol-1。挤压态和电渣态40CrNi4Mo1V钢的动态再结晶体积分数预测模型的拟合度分别为0.96和0.95，实验值与预测值吻合良好。基于该模型分析，确定了两种状态实验钢在不同应变速率下的优化变形温度范围。对比发现，同等变形条件下，电渣态钢因具有更低的热变形激活能而更易触发动态再结晶。

Thermal compression experiments were conducted on 40CrNi4Mo1V steel in extruded and electroslag states by using thermal simulation tester Gleeble-1500, and the true stress-true strain curves were measured. Then, the dynamic recrystallization behavior at the strain rates of 0.01-10 s-1,the temperatures of 1050-1250 ℃, and the reduction amount of 60% was systematically studied. Based on the modified Avrami equation, a dynamic recrystallization kinetics model was established. The results indicate that dynamic recrystallization phenomenon of the steel is significant under high temperature and low strain rate. Through linear regression calculation, the thermal deformation activation energy of the extruded and electroslag states are 511.11 and 493.35 kJ·mol-1, respectively. The fitting degree of the dynamic recrystallization volume fraction prediction model of 40CrNi4Mo1V steel in the extruded and electroslag states is 0.96 and 0.95, respectively, and the experimental value are in good agreement with the predicted values. Based on the model analysis, the optimized deformation temperature ranges of the two experimental steels at different strain rates are determined. By comparison, it is found that under the same deformation conditions, the electroslag steel is easier to trigger dynamic recrystallization due to its lower thermal deformation activation energy.

基金项目：

国防基础科研计划（JCKY2022208A002）

作者简介：李鹏洋（2001-），男，硕士研究生 E-mail：lipengyang2023@163.com 通信作者：蒋波（1990-），男，博士，副教授 E-mail：jiangbo@ustb.edu.cn

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