Microstructure and mechanical properties of hot-rolled V-microalloyed Al-containing medium-Mn steel

作     者：Ming Lei Wei-jun Hui Jiao-jiao Wang Yong-jian Zhang Xiao-li Zhao Ming Lei;Wei-jun Hui;Jiao-jiao Wang;Yong-jian Zhang;Xiao-li Zhao

作者机构：School of MechanicalElectronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China 

出 版 物：《Journal of Iron and Steel Research International》 (J. Iron Steel Res. Int.)

年 卷 期：2020年第27卷第5期

页      面：537-548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：This work was supported by the High-level Scientific Research Foundation for the Introduction of Talent of Beijing Jiaotong University(Grant No.M14RC00010) 

主　　题：Medium-Mn steel Vanadium Intercritical annealing Microstructure Mechanical property 

摘      要：The microstructure and mechanical properties of a V-microalloyed Al-containing medium-Mn steel after hot rolling and intercritical annealing(IA)are *** tested steel exhibits a fne multiphase microstructure consisting of bimodal sizes of ferrite and retained austenite plus considerable amount of fne VC and/or M3C ***-chemical phase analysis shows that about 71.0%of the total V is in VC phase and more than 93%of VC particles is less than 5 *** calculated precipitation strengthening values of VC are^347 and^234 MPa for the specimens intercritically annealed at 625 and 750℃,*** excellent combination of strength and ductility as high as^50 GPa%and yield strength(YS)of 890 MPa was obtained at intercritical temperature(TIA)of 725℃,although it does not correspond to the maximum precipitation strengthening of VC ***,it is suggested that an optimization of TIA corresponding to both excellent combination of strength and ductility and high YS should be further explored through chemical composition and IA process optimization.