Experimental research on the technology of two-pass different temperature rolling for thick steel/aluminum/aluminum-alloy composite plate

Thick steel/aluminum/aluminum-alloy composite plates are one of the key materials connecting steel structures and aluminum alloy structures and have been widely used in the shipbuilding industry and other fields. However, steel/aluminum/aluminum-alloy composite plates with a total thickness of more than 10 mm and a steel layer thickness of more than 5 mm are prone to problems such as inconsistent deformation of component metals and low bonding strength during the rolling process, and cannot be continuously prepared. To solve this problem, this article proposes a two-pass different temperature rolling process for thick steel/aluminum/aluminum-alloy composite plates and conducts research on Q235B steel, 1060 aluminum, and 5083 aluminum alloy as component metals. The results show that the process is reliable. It can prepare Q235B/1060/5083 composite plates with a thickness of 15.65 mm without oxygen protection measures. Meanwhile, the interfacial shear and pull-off strength of the composite plates obtained under different experimental conditions in this article are higher than the requirements of the US military standards MIL-J-24445A and Chinese ship standard CB20091-2012. The composite plates show good performance in 90 degrees and 137 degrees bending tests without obvious defects. Under the best condition, a 1.48 mu m interlocking diffusion layer is formed at the steel/aluminum interface of the composite plates, the interfacial shear strength exceeds 70 MPa, and the interfacial pull-off strength exceeds 110 MPa. Finally, according to the experimental results, the reasons for the feasibility of the two-pass different temperature rolling of thick steel/aluminum/aluminum-alloy composite plates are given.