Abstract
1Cr17/9Cr18MoV multi-layer composite armor plate with uniform thickness of each layer was fabricated by composite casting, hot forging and hot rolling. Microstructure was observed and mechanical properties of multilayer composite plate after heat treatment were carried out. The results show that the microstructure of each layer is uniform and the interface combination between 1Cr17 and 9Cr18MoV is good at the condition of 950°C/30min, oil cooling + 200°C/30min tempering. The bending strength of multilayer composite plate is greater than each single material and the plasticity is between two materials. Tensile fracture mode of 1Cr17 steel with good plasticity is mainly of ductile dimple fracture and that of 9Cr18MoV steel with high strength is mainly cleavage fracture. The tensile strength of multilayer composite plate is 1410MPa and the hardness of 9Cr18MoV and 1Cr17 is 605.5HV and 566.3HV respectively, the mechanical properties has met the qualification of armor.
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