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鈦鋼復合板彎曲過程的掃描電鏡原位觀察

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

  • 摘要: 為了研究鈦鋼復合板在彎曲過程中的斷裂行為,利用掃描電鏡原位觀察了爆炸和爆炸-軋制兩種工藝生產的鈦鋼復合板在彎曲過程中裂紋的萌生和擴展.結果表明:外彎過程裂紋萌生的角度小于內彎過程,鈦鋼復合板內彎比外彎具有更強的抗裂紋產生能力.在爆炸鈦鋼復合板的彎曲過程中,裂紋主要在波頭的界面結合處和漩渦中心處萌生;在爆炸-軋制鈦鋼復合板的彎曲過程中,裂紋在Ti-Fe金屬間化合物硬塊界面處萌生.產生裂紋的主要原因爆炸鈦鋼復合板的波頭界面結合處和漩渦中心處、爆炸-軋制鈦鋼復合板的界面塊狀Ti-Fe金屬間化合物具有較高的硬度,在變形的過程中難以協調變形.

     

    Abstract: 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.

     

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