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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 4    August 2005

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Effect of cold-rolling and annealing on interfacial structures and properties of A500/steel bimetal strip
LI Bao-mian(李宝绵),  HAN Jian-fen(韩建芬), 
XU Guang-ming(许光明),  CUI Jian-zhong(崔建忠)

Key Laboratory of Electromagnetic Processing of Material, Ministry of Education, Northeastern University, Shenyang 110004, China

Abstract: The effect of cold-rolling, by both a series of small passes and single-pass with different deformations as well as the subsequent annealing, on the interfacial structures and properties of A500(AlSn8Pb2Si2.5Cu0.8Cr0.2)/steel bimetal strip produced by liquid-solid roll cladding was investigated. Experimental results of the cold-rolling by a series of small passes show that the interfacial bonding strength increases slightly when the total deformation is less than 7.32% and then decreases gradually with the increase in deformation. Subsequent annealing has no effect on the interfacial structures and properties. The effect of cold-rolling by single-pass less than 33.2% deformation on the interfacial structures and properties is the same as that of multi-pass cold-rolling, whereas cold-rolling by single-pass more than 33.2% deformation followed by annealing at 350℃ for 2.5h can make the interfacial bonding strength increase to a great extent. Metallographic examination of the interface shows that there exist only transverse cracks within the interfacial layer and the clad strip does not split along the interface during cold-rolling if the thickness of interfacial layer is less than 4-5μm. The thick interfacial layer(>5-6μm), however, crumbles during cold-rolling, thus resulting in the splitting of the clad strip.

 

Key words: liquid-solid roll cladding; bimetal bearing strip; interface; interfacial bonding strength 

ISSN 1672-7029
CN 43-1423/U

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