Effect of Ga based microstructure regulation on interface structure and bonding strength of titanium/steel composite plates
Titanium/steel composite materials with high bonding strength have become key foundational materials in fields such as marine,chemical,and energy due to their strong corrosion resistance.Due to titanium being an active metal,the Fe-Ti brittleness phase during the preparation process is a common problem faced by the preparation of titanium/steel composite materials.Different composite interface structures are constructed through microstructure regulation and their formation mechanisms are explored.The results show that after modification and regulation of Ga elements,the Ti side near binding interface structure is composed of β-Ti transformed into α-Ti.At 850 ℃ and 900 ℃ hot rolling,the interface changes from discontinuous TiC and aggregated Fe2Ti particles to a single uniform and con-tinuous TiC layer.The bonding strength has been increased from 190 MPa to 290 MPa.When the difference in diffusion coefficient be-tween DC/γ-Fe and DC/α-Ti is in the range of 5.94 × 10-12-2.9 × 10-12m2/s,the thickness of TiC layer is effectively regulated to 180-190 nm and the generation of Fe2Ti and FeTi is significantly inhibited.
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