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| Effect of Strain Rate on Mechanical Properties and Microstructural Evolution of Bainite-based Quenching-Partitioning (BQ&P) Steel |
| WU Xian1, WANG Zhenqiang2
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1 Engineering Training Center, Jilin University of Chemical Technology, Jilin City 132022,China;
2 College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001,China
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Abstract This paper investigated the effect of quasi-static and high strain rates on mechanical properties and microstructural evolution of BQ&P steel. The quasi-static compression tests were conducted using a universal testing machine at a strain rate of 0.001-0.1 /s, while the high strain rate impact tests were conducted using split Hopkinson pressure bar (SHPB) at a strain rate of 2200-3600/s. The results indicated that BQ&P steel exhibits stronger strain rate sensitivity during high strain rate impact processes. The Peierls mechanism is of great significance for BQ&P steel under quasi-static compression, and the carbon solute mechanism is the main deformation mechanism under high strain rate impact. There are BCC structured bainite/martensite, FCC structured RA, and HCP structured ε-martensite in BQ&P steel. Different deformations led to different transformations of the three phases, and EBSD analysis revealed different orientation relationships between the phases.
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Published: 13 March 2026
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