Influence of coiling temperature on microstructure and mechanical properties of a hot-rolled high-strength steel microalloyed with Ti,Mo and V
作者机构：Hubei Provincial Key Laboratory for New Processes of Iron Making and Steel MakingWuhan University of Science and TechnologyWuhan430081HubeiChina The State Key Laboratory of Refractories and MetallurgyWuhan University of Science and TechnologyWuhan430081HubeiChina Collaborative Innovation Center of Steel TechnologyUniversity of Science and Technology BeijingBeijing100083China
出 版 物：《Journal of Iron and Steel Research International》 (Journal of Iron and Steel Research, International)
年 卷 期：2022年第29卷第3期
页 面：484-493页
核心收录：
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：supported by the National Key R&D Program of China(No.2017 YFB0305100) the Key Research and Development Program of Hubei Province(No.2020BAB057) the Natural Science Foundation and Major Technology Innovation of Hubei Province(No.2017AAA113)
主 题：Ti-Mo-V complex microalloying Coiling temperature Precipitation Strengthening mechanism Microstructure
摘 要：Influence of coiling temperature(CT)on the microstructure and mechanical properties of a hot-rolled high-strength steel microalloyed with Ti,Mo and V was *** precipitation behavior of nano-sized particles was investigated by theoretical calculation and quantitative *** the results revealed that V-enriched(Ti,Mo,V)C precipitated in the ferrite *** the CT decreased,the site fractions of Ti in(Ti,Mo,V)C changed little,the site fractions of Mo increased,and the site fractions of V decreased ***,the low CT could refine the microstructure and precipitated particles but suppress the precipitation of(Ti,Mo,V)C particles simultaneously,leading to the volume fraction of(Ti,Mo,V)C significantly decreasing,consequently causing an increment of grain refinement strengthening and a reduction in precipitation *** the CT was 600℃,the steel characterized by fine polygonal ferrite,a small amount of bainite and nano-sized(Ti,Mo,V)C precipitates exhibited the optimum mechanical properties with the ultimate tensile strength of 870 MPa,yield strength of 807 MPa and elongation to fracture of 17%.
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