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High-strength steels have been attracting more and more attention of people,Unfortunately.deterioration of ductility limited their applications.To solve this problem,a nano-structured stainless steel sheet is developed to combine high strength and high ductility.Processing of the surface mechanical attrition treatment(SMAT) was introduced to obtain a nano-grain layer on the double surface of the stainless steel sheet.The microstructure of the nanostructured steel sheet is characterized by an alternate distribution of coarse grained layer and nanocrystalline layer.Then the dual surface nano-crystallized stainless steel sheets were co-warm rolled at 500℃.The experimental results reveal that the mechanical properties of the nanostructured steel exhibit high yield strength in the range of 700 -950 MPa and tensi le strength higher than 930 MPa.Moreover,elongation to fracture reaches to 15%-48%, together with a uniform elongation stabilized to 13%-45%.
High-strength steels have been attracting more and more attention of people, Unfortunately.deterioration of ductility limited their applications. To solve this problem, a nano-structured stainless steel sheet is developed to combine high strength and high ductility. Processing of the surface mechanical attrition treatment (SMAT) was introduced to obtain a nano-grain layer on the double surface of the stainless steel sheet. The microstructure of the nanostructured steel sheet is characterized by an alternate distribution of coarse grained layer and nanocrystalline layer.Then the dual surface nano -crystallized stainless steel sheets were co-warm rolled at 500 ° C. The experimental results reveal that the mechanical properties of the nanostructured steel exhibit high yield strength in the range of 700 -950 MPa and tensi le strength higher than 930 MPa. to fracture reaches to 15% -48%, together with a uniform elongation stabilized to 13% -45%.