Diffusion Behaviour of Fe-Cu Interface of Copper Brazed Double-wall Steel Tubes

Yourong XU Deying WANG Qi JIN Yijian ZHOU Shanghai University of Science and Technology,Shanghai,201800,ChinaFan HU Chao LIU Iron and Steel Research Institute of Baoshan Iron and Steel Complex,Shanghai,201900,China

Õª Òª£º<Õý> By means of electron probe£¨EPMA£©,scanning electron microscope£¨SEM£©,and optical microscope£¨QM£©,the diffusion behaviour on the Fe-Cu interface of copper brazed double-wall steel tubes andthe microstructure of the diffusion layer have been investigated.There are three kinds of metallurgicalbonds between copper plating layer and steel substrate: £¨1£©the Cu diffusing into steel substratealong grain boundary of ferrite;£¨2£©the Cu diffusion into grain bulk of ferrite: £¨3£©the Fe diffusing intoCu layer.The copper brazed double-wall steel tubes are formed by the combination of the diffusionsmentioned above and this is the reason for excellent mechanical and technological properties of thecopper brazed double-wall steel tubes.

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