锻压技术

铸态300M钢双锥试样热压缩行为

英文标题：Thermal compression behaviors of as-cast 300M steel biconical specimen

单位：1.钢铁研究总院有限公司特殊钢研究院 2.航空工业第一飞机设计研究院 3.湖南大学

分类号：TG142.1

出版年,卷(期):页码：2023,48(11):232-237

摘要：

采用数值模拟和热压缩实验，研究了铸态300M钢双锥试样在加热温度为1000、1100 ℃条件下的动态再结晶行为，通过Deform-3D软件构建了其动态再结晶的微观组织模型，利用EBSD技术对双锥试样等效应变为0.4、0.8、1.8、2.0的位置进行了微观组织分析，探究了其热压缩后的动态再结晶演变规律。模拟结果与实验结果进行对比后发现：热压缩实验的动态再结晶演变结果与数值模拟的结果相吻合，双锥试样等效应变与应变速率的分布规律相同，均沿中心线呈对称分布，最高温度和最大变形量位于中心位置，此处的等效应变峰值为1.78，动态再结晶体积分数随着应变的增大而增大，应变和动态再结晶体积分数之间的关系呈“S”形。

The dynamic recrystallization behavior of as-cast 300M steel biconical specimens at the heating temperature of 1000 and 1100 ℃ was studied by numerical simulation and thermal compression tests, and the microstructural model of dynamic recrystallization was constructed by software Deform-3D. Then, the microstructures of the biconical specimen at the positions with equivalent strains of 0.4, 0.8, 1.8 and 2.0 were analyzed by EBSD technology, and the dynamic recrystallization evolution law after thermal compression was explored. Comparing the simulation results with the test results, it is found that the dynamic recrystallization evolution results of thermal compression test are consistent with the numerical simulation results, and the equivalent strain and strain rates of the biconical specimens have the same distribution law, which are symmetrically distributed along the central line. The maximum temperature and the maximum deformation amount are located in the center, where the peak value of equivalent strain is 1.78. The dynamic recrystallization volume fraction increases with the increasing of strain, and the relationship between strain and dynamic recrystallization volume fraction is “S” shape.

基金项目：

国家重点研发计划（2022YFB3705202）

作者简介：许忠智（1997-），男，硕士研究生，E-mail：xzz_0202@163.com；通信作者：韩顺（1987-），男，博士，高级工程师，E-mail：hanshunfa@126.com

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