Interfacial Oxidation Behavior of Rolled Titanium Steel Clad Plates in Different Vacuum Degrees
TA2/Q345R titanium-steel clad plate was prepared by vacuum hot-rolling cladding technology.The interface structure and mechanical properties of titanium-steel clad plates under different vacuum degrees were analyzed by scanning electron microscope(SEM),Vickers hardness tester,and universal tensile testing machine.The results show that when the vacuum degree of the clad slab is 1 Pa,the titanium cladding layer of the titanium-steel clad plate is obviously oxidized,and a 10 μm oxygen-rich layer and a hardened layer are formed on the surface of TA2,and the hardness of the hardened layer is about 325 HV.When the vacuum degree of the clad slab is 0.1 Pa,the surface of TA2 is partially oxidized,resulting in a gap of about 40 μm thick at the titanium-steel interface,and a metallurgical bond is also generated at the local position.When the vacuum degree of the clad slab reaches 0.01 Pa,the interface of the titanium steel clad is smooth and continuous without visible defects,and the average shear strength is about 179 MPa.Therefore,0.01 Pa is a reasonable vacuum degree for preparing titanium-steel clad plate by rolling method.
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