Production processes for nanostructured wires, bars and strips

Abstract: Some commercially applicable processes for nanostructured steel wires, bars and strips are introduced in this chapter. They are warm multi-pass caliber rolling, warm continuous oval to square rolling, cold strip rolling including cladding, and repetition of cold strip rolling with reverse phase transformation. The basic idea of how to apply the amount of strain necessary for introducing a nanostructure differs depending on the product shape and material. Microstructures with a grain size of several hundred nanometers and the mechanical properties of these materials are presented. Several application examples of these nanostructured steels such as small screws, orifice plates for liquid spray and shafts are explained. The advantage of nanostructured material is not only in strength but also in formability and machinability. The applications take advantages of these unique features of nanostructured steel properly and they are at the stage of mass production.