Influence of prefabricated steel/aluminum composite panel temperature on interface and microstructure properties of rolled steel-aluminum transition joint

Based on the two-pass differential temperature rolling bonding method, the effects of prefabricated steel/aluminum composite panel temperature on interface characteristics and microstructure properties were investigated through exper- imental analysis and finite element simulations. When the temperature exceeds 400 °C, the effective preparation of the steel-aluminum transition joint can be achieved, and with the increase in temperature, the interface shear and pull-off strength of the steel-aluminum transition joint exhibits an initial decrease followed by an increase. Both the interface shear and pull-off fractures are in 1060 aluminum matrix. As the temperature increases, the size of the average grain in 1060 aluminum matrix increases and then decreases. When the temperature reaches 550 °C, the comprehensive performance of the prepared steel-aluminum transition joint is the best, with the interface shear strength of 77 MPa and the interface pull- off strength of 153 MPa, exceeding the bonding strength of the explosive compounding method. There are no pinholes, wrinkles, or cracks in the lateral bending matrix and the interface.