In-situ SEM observation on titanium clad steel plates in the bending process

Two titanium clad steel plates were prepared by exploding and exploding-rolling,respectively.In order to study the fracture behavior of the clad plates during the bending process,crack initiation and propagation were observed by scanning electron microscopy(SEM).The result shows that the crack initiation angle in external bending is less than that in internal bending,the capability of resistance to crack initiation in internal bending is stronger than that in external bending,but.During the bending process,cracks in the exploding clad plate mainly initiate on the interface junction of wave front and the center of whirlpools,but cracks in the exploding-rolling clad plate initiate at the hard lump interfaces of Ti-Fe intermetallic compounds.The main reason of cracking is that the interface junction of wave front and the center of whirlpools of the exploding titanium clad steel plate and Ti-Fe intermetallic compounds in the exploding-and-rolling clad plate are difficult to compatibly deform because of their high hardness.