Transactions of Materials and Heat Treatment

Title：Thermal compression behaviors of as-cast 300M steel biconical specimen

Authors： Xu Zhongzhi1 Han Shun1 Han Wen2 Li Bo2 Li Yong1 Wang Chunxu1 Yuan Wuhua3

Unit： 1. Institute for Special Steel Central Iron and Steel Research Institute 2. AVIC the First Aircraft Institute 3. Hunan University

KeyWords： as-cast 300M steel thermal compression biconical specimen equivalent strain dynamic recrystallization

ClassificationCode：TG142.1

year,vol(issue):pagenumber：2023,48(11):232-237

Abstract：

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.

Funds：

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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