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Development of Ti–V–Mo Complex Microalloyed Hot-Rolled 900-MPa-Grade High-Strength Steel

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

A new Ti–V–Mo complex microalloyed hot-rolled high-strength steel sheet was developed by controlling a thermo-mechanical controlled processing (TMCP) schedule, in particular with variants in coiling temperature. The effects of coiling temperature (CT) on various hardening mechanisms and mechanical properties of Ti–V–Mo complex microalloyed high-strength low-alloy steels were investigated. The results revealed that the steels are mainly strengthened by a combined effect of ferrite grain refinement hardening and precipitation hardening. The variation in simulated coiling temperature causes a significant difference in strength, which is mainly attributed to different precipitation hardening increment contributions. When the CT is 600 °C, the experimental steel has the best mechanical properties: ultimate tensile strength (UTS) 1000 MPa, yield strength (YS) 955 MPa and elongation (EL) 17%. Moreover, about 82 wt% of the total precipitates are nano-sized carbide particles with diameter of 1–10 nm, which is randomly dispersed in the ferrite matrix. The nano-sized carbide particles led to a strong precipitation hardening increment up to 310 MPa.

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Acknowledgments

This work was financially supported by the National Basic Research Program of China (No. 2010CB630805), the National Natural Science Foundation of China (No. 51201036) and China Iron & Steel Research Institute Group (No. 12060840A).

Author information

Authors and Affiliations

  1. Department of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China

    Ke Zhang & Yuan-Mei Li

  2. Central Iron and Steel Research Institute, Beijing, 100081, China

    Ke Zhang, Zhao-Dong Li, Xin-Jun Sun, Qi-Long Yong, Jun-Wei Yang & Yuan-Mei Li

  3. Department of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China

    Jun-Wei Yang

  4. R&D Center, Laiwu Iron and Steel Group Co Ltd, Laiwu, 271104, China

    Pei-Lin Zhao

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  1. Ke Zhang
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  2. Zhao-Dong Li
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  3. Xin-Jun Sun
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  4. Qi-Long Yong
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  5. Jun-Wei Yang
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  6. Yuan-Mei Li
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Correspondence to Ke Zhang.

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Zhang, K., Li, ZD., Sun, XJ. et al. Development of Ti–V–Mo Complex Microalloyed Hot-Rolled 900-MPa-Grade High-Strength Steel. Acta Metall. Sin. (Engl. Lett.) 28, 641–648 (2015). https://doi.org/10.1007/s40195-015-0243-7

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  • DOI: https://doi.org/10.1007/s40195-015-0243-7

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