Influence of Surface Treatment Methods on Bonding Strength of Hot-rolled Steel-aluminum Composite Plates

GUO Yunchang; LU Minghao; QI Zichen; REN Zhongkai; YU Chao; XIAO Hong

doi:10.3969/j.issn.1674-6457.2025.07.005

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (7) : 41-51. DOI: 10.3969/j.issn.1674-6457.2025.07.005

Composite Material Rolling Technology and Equipment

Influence of Surface Treatment Methods on Bonding Strength of Hot-rolled Steel-aluminum Composite Plates

GUO Yunchang¹, LU Minghao¹, QI Zichen², REN Zhongkai³, YU Chao^1,*, XIAO Hong¹

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Abstract

The work aims to clarify the effects of two commonly used surface treatment methods, namely sandpaper grinding and steel wire brush grinding, on the bonding properties of hot-rolled steel-aluminum composite plates after rolling and heat treatment, as well as the fracture mechanism of the composite plates prepared by different grinding methods after annealing. Steel-aluminum composite plates were prepared through surface treatment methods of 3000^#, 180^# sandpaper grinding and steel wire brush grinding. Bonding property tests and microstructure observations were carried out on the obtained three types of composite plates. The fracture morphologies and fracture mechanisms of the composite plates before and after annealing were characterized. The rough surface prepared by sandpaper grinding could improve the bonding strength of the composite plates after rolling. In contrast, the smooth surface ground by sandpaper showed a lower bonding strength after rolling. However, the bonding strength of the steel-aluminum composite plates with a smooth surface ground by sandpaper increased rapidly after annealing. After annealing for 120 min, intermetallic compounds with a granular and spaced distribution were formed at the interface, and at this time, the composite plates had the highest bonding strength. Through in-situ tensile-shear experiments, it was observed that the granular intermetallic compounds could hinder the crack propagation and force the crack to turn. For the steel-aluminum composite plates prepared by steel wire brush grinding, the surface work-hardened layer peeled off after rolling. However, after annealing, the surface work-hardened layer and the steel matrix were re-healed, and the composite plates exhibited a high bonding strength. In conclusion, the steel-aluminum composite plates prepared by 180^# sandpaper grinding have a high bonding strength after rolling; the steel-aluminum composite plates prepared by 3000^# sandpaper grinding show excellent bonding properties after heat treatment; and the steel-aluminum composite plates prepared by steel wire brush grinding exhibit high bonding strength both after rolling and heat treatment.

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hot-rolled composite / annealing process / fracture morphology / element diffusion / intermetallic compound

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GUO Yunchang, LU Minghao, QI Zichen, REN Zhongkai, YU Chao, XIAO Hong. Influence of Surface Treatment Methods on Bonding Strength of Hot-rolled Steel-aluminum Composite Plates[J]. Journal of Netshape Forming Engineering. 2025, 17(7): 41-51 https://doi.org/10.3969/j.issn.1674-6457.2025.07.005

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