Effect of Reheating between Rolling Passes on Microstructure and Bonding Properties of Hot-rolled Ti/Steel Clad Plates

doi:10.3901/JME.260043

Abstract

Abstract: Ti/steel clad plates serve as advanced metal laminated composite materials and offer advantages such as corrosion resistance, lightweight properties and high strength. The interface bond strength of Ti/steel clad plates manufactured by traditional rolling is low, often requiring multiple rolling passes and cumulative high reduction ratios. Fabricating Ti/steel clad plates using double-layer assembly and hot rolling is proposed. Three groups of clad plates are prepared by single-pass（SR） rolling, double continuous-passes rolling（DR） and double-passes rolling with reheating（DRH）. The reduction ratio in the first pass is 35%, and the accumulated reduction ratio is 50%. The microstructure, element diffusion and compound formation at the interface are analyzed using SEM, EBSD and XRD. The influence mechanism of reheating between passes on the microstructure and bonding properties of the Ti/steel dissimilar metal interface is clarified. The results show that the tensile shear strength after SR and DR are 311 MPa and 351 MPa, respectively. A solid solution state is formed at the interface. The bond strength is higher than that of the titanium matrix, resulting in the tensile shear fracture occurring in the titanium matrix. Reheating between passes accelerates the element diffusion behavior at the interface, resulting in α→β and γ→α phase transitions on the Ti and steel sides, respectively. Intermetallic compound layers with a thickness of 2.5 μm are formed and distributed continuously at the interface, including Fe-Cr, Cr₃ Ni₂, CrTi₄, Fe₂ Ti and Ni Ti. Due to inherent brittleness, these compounds are prone to breaking during the second pass rolling, forming holes inside and at the ends of the compound, significantly reducing the interface bond strength. Rolling Ti/steel clad plates through multiple passes should adopt continuous rolling and avoid reheating between passes. This process has significant advantages in bonding strength and reduction rate compared with other technologies and has broad prospects for the preparation of high-performance Ti/steel clad plates.

Key words: Ti/steel clad plates, bond strength, microstructure, interfacial compounds

CLC Number:

TG335.1

WU Yue, ZHANG Haiming, LIU Chang, BAI Jinglong, ZHANG Tingting, WANG Tao, HUANG Qingxue. Effect of Reheating between Rolling Passes on Microstructure and Bonding Properties of Hot-rolled Ti/Steel Clad Plates[J]. Journal of Mechanical Engineering, 2026, 62(2): 146-156.

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