| Development of Ti–V–Mo Complex Microalloyed Hot-Rolled 900-MPa-Grade High-Strength Steel |
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| 摘 要： | 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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| 收稿时间： | 2014-09-02 |
Development of Ti-V-Mo Complex Microalloyed Hot-Rolled 900-MPa-Grade High-Strength Steel |
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| Authors: | Ke Zhang Zhao-Dong Li Xin-Jun Sun Qi-Long Yong Jun-Wei Yang Yuan-Mei Li Pei-Lin Zhao |
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| Affiliation: | 1.Department of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China2 Central Iron and Steel Research Institute, Beijing, 100081, China3 Department of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China4 R&D Center, Laiwu Iron and Steel Group Co Ltd, Laiwu, 271104, China |
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| 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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| Keywords: | Hot-rolled high-strength steel Strengthening mechanism Nano-sized carbide Precipitation hardening Coiling temperature |
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