The effect of copper interlayer on metallurgical properties of roll bonding titanium clad steel

Cladding of steel with titanium alloys to improve corrosion behavior and reduce production costs، is used widely in aerospace، chemical and nuclear industries. Roll bonding is one of the solid state processes to produce this combination. In this research the high quality bonding of hot roll bonding of titanium on steel Substrate was investigated in terms of physical and mechanical properties، and the effect of copper interlayer to prevent interdiffusion was evaluated. The microstructure at interface was observed by an optical and scanning electron microscope and the presence of intermetallic phases in the reaction zone was examined by X-ray diffraction on the fracture surfaces of the joints. The experimental results showed that the volume fraction of intermetallic will be controlled effectively، because there is not enough time for interdiffusion of the elements. Total thickness of intermetallic layers and microhardness at the interface increased with increasing bonding temperature.