Effect of Cold Rolling Reduction on Performance of Thin Aluminum Clad Steel Strips for Brazing

doi:10.11901/1005.3093.2014.317

Chinese Journal of Materials Research

2015, Vol. 29

Issue (1): 25-31 DOI: 10.11901/1005.3093.2014.317

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Effect of Cold Rolling Reduction on Performance of Thin Aluminum Clad Steel Strips for Brazing

Long LI,Xin CHEN,Chuang GAO,Xiaojun ZHANG,Dejing ZHOU(

),Yabiao LING

Yin Bang Clad Material Co., Ltd., Jiangsu Key Laboratory for Clad Materials, Wuxi 214145, China

Cite this article:

Long LI,Xin CHEN,Chuang GAO,Xiaojun ZHANG,Dejing ZHOU,Yabiao LING. Effect of Cold Rolling Reduction on Performance of Thin Aluminum Clad Steel Strips for Brazing. Chinese Journal of Materials Research, 2015, 29(1): 25-31.

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Abstract

Thin 4A60 Al-alloy clad 08Al-steel strips were made by cold rolling with different reduction rates. The clad strips were then brazed with a thin film of 3003 Al-alloy. The interfacial bonding strength of aluminum to steel was evaluated by tensile shearing test in order to determine critical rolling reduction of thin aluminum clad steel sheets. The fracture morphology and element distribution were observed and analyzed by means of scanning electron microscope (SEM), energy dispersive spectrometer (EDS), respectively. Finally, a minimum bonded reduction of 35% was suggested and the stable reduction of 50% was proposed based on the measured bonding strength and the observed fracture morphology.

Key words: metallic materials aluminum clad steel strip cold roll bonding critical reduction tension shear testing

Received: 02 July 2014

Fund: *Supported by National High Technology Research and Development Program of China No. 2013AA031301, International Science and Technology Cooperation Program of China No. 2013DFB50170, and Jiangsu Key Laboratory No. BM2014006.

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	Long LI
	Xin CHEN
	Chuang GAO
	Xiaojun ZHANG
	Dejing ZHOU
	Yabiao LING

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.317 OR https://www.cjmr.org/EN/Y2015/V29/I1/25

Table 1 Chemical composition of components for aluminum clad steel strip (mass fraction, %)

Fig.1 Brazing process of aluminum clad steel strip

Fig.2 Schematic diagram of tensile shearing specimen (unit: mm)

Fig.3 Microstructure of 4A60/08Al clad material after brazing (a) and the element distribution across interface before and after brazing treatment (b)

Fig.4 Bonding strength of 4A60/08Al clad strips with different cold-rolling reductions

Fig.5 SEM images of 4A60/08Al clad strips surface after shearing, conditions: (a) reduction in thickness: 0%; (b) 25%; (c) 35%; (d) 50%

Fig.6 SEM images of 4A60/08Al clad strips surface after shearing, (a) 25%; (b) 35%; (c) 35%; (d) 50%

Fig.7 SEM images of 08Al surface after removing aluminium by chemical means at different deformation levels, (a) 25%; (b) 50%

Fig.8 Relationship between Al area fraction and reduction (a) and bonding strength and Al area fraction on the fracture surface (b)

Fig.9 Experimental data and predicted data of bond strength

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