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Open AccessArticle

Constitutive Model and Flow Behavior of B1500HS High-Strength Steel During the Hot Deformation Process

by Muyu Li 1,2, Yongchuan Duan 1,2, Dan Yao 1,2, Yingping Guan 2,* and Liu Yang 1,2
1
Key Laboratory of Advanced Forging & Stamping Technology and Science, Yanshan University, Ministry of Education of China, Qinhuangdao 066000, China
2
School of Mechanical Engineering, Yanshan University, Qinhuangdao, China
*
Author to whom correspondence should be addressed.
Metals 2020, 10(1), 64; https://doi.org/10.3390/met10010064
Received: 20 November 2019 / Revised: 21 December 2019 / Accepted: 24 December 2019 / Published: 31 December 2019
Hot compression tests were carried out on a Gleeble-3800 thermal mechanical simulator in the temperature range from 700 to 900 °C and strain rate range from 0.005 to 10 s−1 to investigate the hot deformation behavior of B1500HS high-strength steel. Softening mechanisms of B1500HS high-strength steel under different deformation conditions were analyzed according to the characteristics of flow stress–strain curves. By analyzing and processing the experimental data, the values of steady flow stress, saturated stress, dynamic recovery (DRV) softening coefficient, and other factors were solved and these parameters were expressed as functions of Zener–Hollomon factors. Based on the dislocation density theory and the kinetic model of dynamic recrystallization (DRX), constitutive models corresponding to different softening mechanisms were established. The flow stress–strain curves of B1500HS predicted by a constitutive model are in good agreement with the experimental results and the correlation coefficient is . The comparison results indicate that the constitutive models can accurately reflect the deformation behavior of B1500HS high-strength steel under different conditions. View Full-Text
Keywords: B1500HS high-strength steel; softening mechanism; dislocation density theory; dynamic recrystallization; constitutive model B1500HS high-strength steel; softening mechanism; dislocation density theory; dynamic recrystallization; constitutive model
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Li, M.; Duan, Y.; Yao, D.; Guan, Y.; Yang, L. Constitutive Model and Flow Behavior of B1500HS High-Strength Steel During the Hot Deformation Process. Metals 2020, 10, 64.

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