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The aluminum clad steel plates is a typical layered metal composite material, which has a wide range of application prospects in the fields of ships, chemicals, aerospace, etc. Its thickness specifications range from 0.1mm (such as radiator fins) to 100mm (such as for ships). High-quality Aluminum clad steel plates), the size spans 3 orders of magnitude. At present, the medium-thickness Aluminum clad steel plates are mainly prepared by explosive cladding methods. The process is relatively mature, but there are still certain limitations in dealing with extreme specifications such as severe weather, thinner coatings, and wide widths. The rolling composite method has the advantages of continuous and high efficiency, and has been successfully applied to the industrial preparation of stainless steel/carbon steel composite plates, aluminum alloy composite strips for brazing, and thin-gauge steel/aluminum, copper/aluminum and other layered composite materials. Technological and theoretical research has made great progress. However, in the existing literature research and steel/aluminum composite plate rolling experiment research, it is found that the component thickness has a significant effect on the bonding strength of the Aluminum clad steel plates interface, that is, it is easier to obtain a relatively ideal The bonding strength of the interface, and as the thickness increases, the interface strength weakens and even cannot be welded.
 


In the laboratory, the warm-rolled composite experiment and the interface shear strength test of steel/aluminum composite plates of different thicknesses were carried out. In order to avoid the oxidation of the interface of the steel/aluminum composite billet during the preheating process, the slab is covered with aluminum foil under the protection of inert gas to achieve a good expected effect. Under the working conditions of the original layer thickness ratio of 1:1, the rolling temperature of 400℃, the rolling speed of 60mm/s, and the single pass reduction rate of 40%, the four-sided thicknesses of 1.5mm, 2mm, 3mm, 4mmm were carried out. Rolling experiments of steel/aluminum composite plates with different thicknesses. The results show that the interfacial shear strength of the steel/aluminum composite plate shows a changing law that decreases with the increase of the component thickness. When the initial single-sided component thickness is 1.5mm, the average interfacial bonding strength of the composite board is 62MPa; when the initial single-sided component thickness is 4mm, the average interfacial shear strength of the composite board drops to 21MPa, which can no longer achieve effective composite . At the same time, advanced equipment such as scanning electron microscope (SEM) and energy spectrometer (EDS) was used to observe and analyze the microscopic morphology and element diffusion of the steel/aluminum composite interface under different working conditions.