Effect of Pre-strain Rate on Microstructure and Mechanical Properties of QP1180 Steel

XU Feiyue; LI Bing; ZHANG Peng; CHEN Wenxuan; ZHANG Hongxia; XING Junfeng

doi:10.3969/j.issn.1674-6457.2025.08.012

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (8) : 107-114. DOI: 10.3969/j.issn.1674-6457.2025.08.012

Iron and Steel Forming

Effect of Pre-strain Rate on Microstructure and Mechanical Properties of QP1180 Steel

XU Feiyue¹, LI Bing^1,*, ZHANG Peng¹, CHEN Wenxuan¹, ZHANG Hongxia¹, XING Junfeng²

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Abstract

The work aims to investigate the effects of different pre-strain rates on QP1180 steel, determine the optimal pre-strain rate, analyze the microstructural evolution and mechanical response under different pre-strain rates, and thereby optimize the comprehensive properties of QP1180 high-strength steel. First, QP1180 steel was subject to pre-strain treatment at different rates. Subsequently, optical microscopy, scanning electron microscopy, XRD testing, tensile testing, and hardness testing were employed to systematically investigate the changes in QP1180 steel and its mechanical properties. The microstructural types did not show significant changes under different pre-strain rates. As the rate increased, the residual austenite content decreased, while the martensite content increased. When the pre-strain rate was 10^-1 s^-1, the hardness value of the specimen reached a maximum of 398.7 HV. As the pre-strain rate increased from 10^-4 s^-1 to 10^-1 s^-1, the yield strength of QP1180 steel gradually increased from 1 157.2 MPa to 1 297.6 MPa, while the elongation decreased from 15.8% to 13.2%. However, there was no significant difference in tensile strength. The strength-plasticity product, which reflected the overall performance of the material, reached its highest value of 21.3 GPa·% at the low pre-strain rate of 10^-4 s^-1, indicating the best overall performance. The fracture mode of the tensile specimens was ductile fracture, and all exhibited distinct ductile dimple patterns. In conclusion, according to the systematic analysis of the microstructural evolution and mechanical properties of QP1180 steel under different pre-strain rates, it was concluded that the material exhibits the best overall performance under a pre-strain of 4% and a strain rate of 10^-4 s^-1, providing valuable guidance for the safe service life of QP1180 steel.

Key words

QP1180 steel / pre-strain rate / microstructure / mechanical properties / retained austenite

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XU Feiyue, LI Bing, ZHANG Peng, CHEN Wenxuan, ZHANG Hongxia, XING Junfeng. Effect of Pre-strain Rate on Microstructure and Mechanical Properties of QP1180 Steel[J]. Journal of Netshape Forming Engineering. 2025, 17(8): 107-114 https://doi.org/10.3969/j.issn.1674-6457.2025.08.012

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