Abstract
Modern composite armor is generally composed of faceplate with high hardness and backplate with good toughness. The 45steel/60Si2CrA multi-layer composite armor plate with eleven layers in which 60Si2CrA steel was used as faceplate and 45 steel as backplate was fabricated by composite casting+forming process. In order to achieve good bulletproof effects, the heating treatment processes of multi-layer composite plate were researched. The results show that the yield strength and tensile strength of the composite plate reaches 956MPa and 1018MPa and the hardness of 45 steel layer and 60Si2CrA layer is 448HV and 536HV respectively under the condition of 860°C water quenching+high temperature tempering. The mechanical properties meet standard requirements of armor plate.
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