FORMING MECHANICS OF A TWIN-ROLL CAST AA1100/409L CLAD SHEET AFTER ANNEALING AND COLD ROLLING

Forming mechanics of a twin -roll cast AA1100/409L clad sheet after annealing and cold rolling was investigated by tensile and three-point bending tests. The effect of mechanical properties of the base metals and bonding strength on the strength and ductility of the clad sheet was investigated based on the mixed rule. The clad sheet's strength obeys the mixed rule only when the bonding strength is as high as 15 N/mm. The negative correlation between strength and ductility and the synergistic effect also exist in the TRC SS/Al clad sheet only when the bonding strength is as high as 15 N/mm. Because of the too small thickness and much higher strength of the steel layer than that of the Al layer, tensile stress dominates during bending of the TRC clad sheet. The deformation and failure process of the clad sheet was analyzed and the processing route for a better formability was proposed.