Influence of Austenitizing Temperature on the Hot Deformation Behaviors of High-strength Steel

doi:10.3901/JME.260253

Abstract

Abstract: The hot deformation behavior of the material is affected by many parameters, which leads to complex microstructure evolution law and difficulty in the control of flow behavior. Therefore, the effects of austenitizing temperature, deformation temperature, and strain rate on the flow behavior and microstructure evolution of 300M steel are studied based on Gleeble-3500 equipment. The results show that the effect of austenitizing temperature on the flow behavior of 300M steel is more complex than that of deformation temperature and strain rate. With the increase of austenitizing temperature, the flow stress of 300M steel changes little before the peak strain, and decreases first and then increases after the peak strain. Based on microstructure analysis, it is found that dynamic recrystallization progresses more fully with the increase of deformation temperature, the decrease of strain rate and austenitizing temperature. The effect of austenitizing temperature on the progress of dynamic recrystallization is mainly ascribed to the fine grain size induced by low austenitizing temperature. In order to accurately describe the coupling effects of austenitizing temperature, deformation temperature, strain rate and strain on the flow stress response, the polynomial of grain size before deformation is introduced into the Hensel-Spittel model, and the constitutive model of 300M steel modified by Hensel-Spittel model is established. The prediction accuracy of the established model reaches 0.997 27. The above study lays a theoretical foundation for accurately predicting and controlling the hot deformation behavior of 300M steel.

Key words: high-strength steel, austenitizing temperature, initial grain size, dynamic recrystallization, constitutive model

CLC Number:

V252

ZHAO Mingjie, LU An, HUANG Liang, JIANG Lihong, LI Jianjun, GUO Zhenghua. Influence of Austenitizing Temperature on the Hot Deformation Behaviors of High-strength Steel[J]. Journal of Mechanical Engineering, 2026, 62(5): 390-398.

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URL: http://www.cjmenet.com.cn/EN/10.3901/JME.260253

http://www.cjmenet.com.cn/EN/Y2026/V62/I5/390

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