1993 Volume 79 Issue 1 Pages 62-68
A technique for hot rolling of the titanium clad steel sheet in atmospheric condition has been newly developed.
The titanium and steel sheets are assembled in the atmosphere through the copper sheet as insert metal between them. When such clad steel assembly is heated to high temperature, intermetallic compounds of titanium and copper are formed and melted in the interface. The air bubbles and oxides generated in the interface, are squeezed out from the interface with the aid of the melted intermetallic compound and compressive rolling pressure during hot rolling which results in the metallurgical bonding of clean metal surfaces of titanium and copper. On the other hand, copper sheet and steel can be easily bonded because of unstable oxides of both metals. In this technique, the most suitable heating temperature and time for the better bonding properties are 850 to 900°C for 300 to 1800 seconds. Titanium clad steel sheet manufactured using this technique shows approximate 180 MPa of shear strength. Such titanium clad steel is thought to have satisfactory performance with practical use although its bonding strength is relatively lower than those of conventional titanium clad steel manufactured in vacuum condition.
