Constitutive Modeling and Dynamic Recrystallization Mechanisms of an Ultralow-carbon Microalloyed Steel During Hot Compr
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https: //doi. org/10.1007/s11595-020-2341-2
Constitutive Modeling and Dynamic Recrystallization Mechanisms of an Ultralow-carbon Microalloyed Steel During Hot Compression Tests LI Ning, HUANG Yao, HAN Renheng, BAO Ziming, ZHU Yanqing, ZHANG Hexin, ZHAO Chengzhi*
(Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China) Abstract: The hot deformation behavior of an ultralow-carbon microalloyed steel was investigated using an MMS-200 thermal simulation test machine in a temperature range of 1 073-1 373 K and strain rate range of 0.01-10 s-1. The results show that the flow stress decreases with increasing deformation temperature or decreasing strain rate. The strain-compensated constitutive model based on the Arrhenius equation for this steel was established using the true stress-strain data obtained from a hot compression test. Furthermore, a new constitutive model based on the Z-parameter was proposed for this steel. The predictive ability of two constitutive models was compared with statistical measures. The results indicate the new constitutive model based on the Z-parameter can more accurately predict the flow stress of an ultralow-carbon microalloyed steel during hot deformation. The dynamic recrystallization (DRX) nucleation mechanism at different deformation temperatures was observed and analyzed by transmission electron microscopy (TEM), and strain-induced grain boundary migration was observed at 1 373 K/0.01 s-1. Key words: ultra-low carbon microalloyed steel; hot deformation behavior; constitutive modeling; dynamic recrystallization
1 Introduction Low-carbon microalloyed steel has attracted the attention of many researchers for years owing to its various advantages, such as a high strength, stable anti-corrosion properties, excellent low temperature impact toughness and satisfactory weldability [1-3]. Low-carbon microalloyed steel can be widely applied in numerous fields after rolling and forging, such as architecture, bridge construction, automobile manufacturing and marine engineering[4]. The excellent properties of low-carbon microalloyed steels can be obtained with reasonable hot-working processes[5-7]. The hot deformation constitutive equation of an alloy can accurately describe the relationship between deformation temperature, strain rate, true strain and flow stress during hot © Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature 2020 (Received: Apr. 29, 2019; Accepted: May 18, 2020) LI Ning(李宁): Ph D candidate; E-mail: [email protected] *Corresponding author: ZHAO Chengzhi(赵成志): Prof.; Ph D; E-mail: [email protected] Funded by the Fundamental Research Funds for the Central Universities (Nos.HEUCFP201731 and HEUCFP201719), and the "One Three Five" Equipment Pre-research National Defense Science and Technology Key Laboratory Fund (No.KZ42180125)
compression. Therefore, the constitutive model of an alloy is co
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