Research on Microstructure and Properties of Multi-layered Steels by Vacuum Accumulative Roll-bonding
Taking 30CrMo steel and 316L austenitic stainless steel as original materials,36 layers,72 layers,162 layers,405 layers of multi-layered steels(MLS)with high strength and high toughness were successfully prepared by vacuum accumulative roll-bonding.The results show that great metallurgical bonding is achieved at the interface of multilayer steel,The 30CrMo layer is mainly the ferrites structure in the reply state,316L layer is morphorphic austenitic microstructure.As the number of layers of MLS increases,the interface changes from straight to wavy,the element diffusion is obviously intensified,and the diffusion layer is formed martensite structure,which can effectively improve the strength of materials.The strength of MLS increases with the increase of layers,the 36 layer steel shows the tensile strength of 734 MPa and a high broken elongation at 41.5%.The 405 layers steel exhibits excellent combination of strength and plasticity,with the tensile strength of 1125 MPa and elongation of 22.5%.The high interfacial bonding strength of multi-layered steels is beneficial to keep the coordinated deformation of two components,and the premature local necking in brittle layer is effectively restrained by ductile layer and several strong interfaces,which can improve the toughness of the materials.
multi-layered steelsvacuum accumulative roll-bondinghigh strength and plasticity
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