An investigation into the effect of surface preparation method and heat Treatment on mechanical properties of multilayer Al / Al / Steel sheet produced by cold roll bonding

The use of cold rolling, is one of the methods of producing multilayer clad sheets. The advantages of this method over other methods of producing multilayer clad sheets have led to its widespread use in recent years. Existence of several parameters affecting the mechanical properties and bond strength of multilayer sheets produced by cold roll bonding, has made research in this field important. In this paper, using experimental method, the effect of several effective parameters such as temperature and time of thermal operation and type of sheet surface preparation on the mechanical properties of AA5456 / AA1020 / St321 three-layer sheet produced by cold rolling has been investigated. In this regard, two sanding methods including flap disc and Cylindrical Sandpaper have been used to prepare the surface of the sheets and heat treatment has been performed at three temperature levels of 310, 355 and 400 ° C for three periods of 30, 60 and 90 minutes. The results of these tests showed that the highest increase in tensile strength was obtained in the sample of heat treatment at a temperature of 400 ° C for 60 minutes and surface preparation by Cylindrical Sandpaper.