Aluminum Alloy/stainless Steel Rolling Composite Technology And Interface Reaction Research

Aluminum/stainless steel laminated composites which combine good properties of corrosion resistance, wear resistance, good mechanical properties of stainless steel with high electrical conductivity, thermal conductivity of aluminum and aluminum alloy, have been widely used in the automobile industry, aerospace, mechanical industry, chemical industry, home appliance, daily life, et al. In this thesis, AA3003/SUS304laminated composite was produced by "surface treatment-roll bonding-diffusion annealing" three-step hot roll bonding. The influence of rolling temperature, thickness reduction on the bonding strength and the deformation distribution of the aluminum/stainless steel laminated composite was investigated by means of peeling test, optical metalloscope (OM), scanning electron microscopy (SEM), energy spectrum analysis (EDS) and X-ray diffraction (XRD), and meanwhile the growth behavior of the intermetallic compounds at the interface has also been studied under different annealing conditions. The main conclusions are as follows:(1) The influence of the hot rolling temperature and thickness reduction on the bonding strength of the laminated composite was investigated. At an specific thickness reduction(23.8%), the bonding strength increased with the increasing of the hot rolling temperature in the range of350℃to500℃;At specific hot rolling temperature(450℃), the bonding strength increased with the increasing of thickness reduction in the range of17.6%to39.1%.(2) The influence of the hot rolling temperature and thickness reduction on the deformation distribution was investigated, and four layers symmetric rolling was proposed to avoid bending during roll bonding. With increasing of rolling temperature, the differentials of relative reduction of aluminum and stainless steel becomes bigger, the deformation rate of stainless steel layer decreases, while the deformation rate of the aluminum layer increased. The thickness reduction of each component increased with the total rolling thickness reduction. Four layers symmetric rolling can effectively eliminate the bending phenomenon, at the same time improve the production efficiency, compared to the two layers asymmetric rolling(3) By choosing the effective concentrations with the compositon of2at%Fe and98at%Al, the effective heat of formation model(EHF) of intermetallic compounds was successfully used to predict the phase formation in Fe-Al binary system. It was predicted that FeAl3was the phase formed during annealing, and with the elongation of annealing time and increasing of the temperature, Fe2Al5began to form, gradually.(4) The intermetallic compound Fe2Al5formed at the interface, which formed when temperature was up to500℃. The growth of the IMC was controlled by diffusion, with elongation of the annealing time, the IMC Fe2Al5became thicker according to the parabolic law. Through the linear fitting,the growth activation energy Q for growth of the IMC was calculated to be162.3KJ/mol, and the growth kinetics model was...