Heterogeneous multi-layered IF steel with simultaneous high strength and good ductility

38th Risø International Symposium on Materials Science

Zhang, Ling^1,2 ; Jiang, Xiaojuan^1 ; Wang, Yuhui^3 ; Chen, Qiang^4 ; Chen, Zhen^1 ; Zhang, Yonghong^1 ; Huang, Tianlin^1,2 ; Wu, Guilin^1

College of Materials Science and Engineering, Chongqing University, Shazhengjie 174, Chongqing

400044, China^1

Electron Microscopy Center of Chongqing University, Chongqing University, Chongqing

400044, China^2

National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao

066004, China^3

Southwest Technology and Engineering Research Institute, Chongqing

400039, China^4

关键词: Different length scale;    Electron back scatter diffraction;    Hierarchical structures;    High strength;    If steel sheets;    Lamella structures;    Microstructural analysis;    Strength and ductilities;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/219/1/012052/pdf
DOI  :  10.1088/1757-899X/219/1/012052

来源: IOP

【 摘 要 】

Multi-layered IF steel samples were designed and fabricated by hot compression followed by cold forging of an alternating stack of cold-rolled and annealed IF steel sheets, with an aim to improve the strength of the material without losing much ductility. A very good combination of strength and ductility was achieved by proper annealing after deformation. Microstructural analysis by electron back-scatter diffraction revealed that the good combination of strength and ductility is related to a characteristic hierarchical structure that is characterized by layered and lamella structures with different length scales.