Abstract: It is difficult to fabricate thick steel/aluminum laminated plate directly by existing rolling process because of the large thickness and obvious difference of characteristics between steel and aluminum. Plasma coating technology and hot rolling process are combined to prepare thick steel/aluminum plate successfully. The effects of rolling pass, temperature and reduction on interfacial bonding characteristics and mechanical properties of steel/aluminum plate qere investigated by the interface shear strength test and SEM, EDS. The results show that the interface bond strength after treatment of plasma spraying is significantly improved compared with direct rolling, and the shear fracture surface is located at the steel/coating interface. Under the condition of single pass rolling, with the rolling reduction increases, the micro-interface of the steel/coating is improved, and the bonding strength of the steel/aluminum plate is gradually improved. In the range of 400℃ to 500℃, the thickness of the steel/aluminum interface diffusion layer increases with the increase of rolling temperature generally, and the bonding strength first increases and then decreases. Due to the uncoordinated deformation, increasing the rolling pass will destroy the bonding effect previously, resulting in a sharp decrease of bonding strength. The steel/aluminum plate has an interface shear strength of 66 MPa when the rolling temperature is 450℃ and the single pass reduction is 40%, which comply with the relevant. Research results provide a new way for the production of thick steel/aluminum plate.

Key words: hot rolling process, mechanical property, micro-interface, plasma spraying, thick steel/aluminum laminated plate