钛钢复合板弯曲过程的扫描电镜原位观察

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

为了研究钛钢复合板在弯曲过程中的断裂行为,利用扫描电镜原位观察了爆炸和爆炸--轧制两种工艺生产的钛钢复合板在弯曲过程中裂纹的萌生和扩展.结果表明:外弯过程裂纹萌生的角度小于内弯过程,钛钢复合板内弯比外弯具有更强的抗裂纹产生能力.在爆炸钛钢复合板的弯曲过程中,裂纹主要在波头的界面结合处和漩涡中心处萌生;在爆炸--轧制钛钢复合板的弯曲过程中,裂纹在Ti--Fe金属间化合物硬块界面处萌生.产生裂纹的主要原因爆炸钛钢复合板的波头界面结合处和漩涡中心处、爆炸--轧制钛钢复合板的界面块状Ti--Fe金属间化合物具有较高的硬度,在变形的过程中难以协调变形.

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.