| ABSTRACT:Steel-aluminum-graphite bonding plate with steel of high strength and high stiffness,the thermal conductivity and corrosion resistance of the aluminum alloy,good lubricity properties of graphite,is very ideal self-lubricating composite material can be applied to rail transport,automobile,shipbuilding,aerospace and other fields.In order to solve the problems of complex production process and poor performance of complex interface in the preparation technology of steel back bonding plate,In this paper,the semisolid tensile cast composite forming of steel-aluminum-graphite bonding plate is studied.The main research work and achievements are as follows:(1).In the preparation of aluminum-graphite semisolid slurry,the uniform distribution of aluminum-graphite semisolid slurry with Si(1.5wt.%)was successfully prepared by the electromagnetic-mechanical mixing technique.The linear relationship between solid phase ratio and stirring temperature is obtained and the effect of solid phase ratio on the distribution of graphite particles was determined.(2).Firstly,carried out a numerical simulation study using finite element software ANSYS and ABAQUS for the composite of steel-aluminum-graphite semisolid tensile casting:1)The process parameters of steel-aluminum-graphite semisolid tensile casting composite forming were preliminarily determined.2)The steel plate pre-tension parameters range with reduce shrinkage difference of aluminum-graphite coating and steel plate in cooling process was obtained.(3).Secondly,the semisolid tensile casting research was carried out at condition of steel preheat temperature 450℃,semisolid slurry temperature 620℃,casting speed 0.5m/min,convection heat transfer coefficient 200W/(m2·k),and in range of any other processing parameters that already preliminary identified by simulation study:1)Research on the mechanical properties of composite interface,the influence rule of steel plate pre-tension on interfacial shear strength was got.2)Research on the micro structure of composite interface,the composite process with uniform elimination interface lattice distortion,removal of residual stress and the maximum shear strength of the interface was obtained. |
