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Abstract
Multilayered metal composites consisting of alternating metals or alloys have been well developed to obtain the superior mechanical properties different from those in any of the constituent materials. The layer integrated steel and metals research project sponsored by Japan government started from 2006 and aimed to fabricate steel sheets with high strength (>1200 MPa) and superior elongation (>20%), through the composite design of high strength steels and ductile steel layers. In the present work, two kinds of hot rolling bonded multilayered composites consisting of austenitic stainless steel/bainite (martensite) steel are focused. The effects of hot rolled microstructure and the annealed microstructure on the tensile behaviour of a 25-layer laminated composite steel are discussed. On the other hand, the tensile deformation microstructure of the hot rolling bonded and annealed 15-layer composite steel is systematically investigated in order to find the reason for the enhanced plasticity of the brittle layer in the composite.