Evolution of interface and collaborative deformation between Ti and steel during hot roll bonding

Abstract

Ti/steel plate was fabricated by hot roll bonding, a wide range of rolling reductions (0–86.8%) were achieved in single Ti/steel plate by using initial wedge Ti and steel component plates. The evolution of interface and collaborative deformation between Ti and steel during hot roll bonding were investigated. Results indicated that the rolling reduction has significant influence on the interface of the Ti/steel plate. The peel strength of the Ti/steel plate increased with the increase of the rolling reduction, which was mainly attribute to the formation of a continuous bonding interface instead of a consecutive impurity layer between the Ti and steel layers. Larger rolling reduction also promoted the stronger collaborative deformation between the Ti and steel layers. As a result, shear deformation was introduced in the Ti and steel layers, which further caused inhomogeneous distribution for the microstructure and texture along the thickness. In the Ti layer, the shear deformation and the activation of <c + a>-type slip systems lead to the formation of RD-split basal texture instead of the traditional TD-split basal texture after rolling. In addition, the shear texture components were identified in the steel layer, whose fraction was inhomogeneous along the thickness.