Effect of billet assembly methods and rolling processes on microstructure and properties of titanium/steel clad plate
Titanium/steel clad plates were fabricated by vacuum roll-cladding technology. The effects of rolling reduction and temperature on the interfacial microstructure and shear properties were investigated under different billet assembly methods. The results show that the interfacial shear strength gradually increases with increasing reduction for interstitial and contact billet assemblies,and the interstitial interfaces exhibit higher strength. At lower reductions,the method of interstitial assembly forms more TiC,inhibiting Fe diffusion into the titanium and resulting in less β-Ti formation. The increased rolling reduction promotes element diffusion on both sides of the interface and improves the uniformity of interfacial compounds,which reduces the stress concentration and delayed crack propagation. As the rolling temperature increases,the interfacial shear strength decreases significantly. At 850 ℃ with 80％ rolling reduction,the average shear strength reaches 207 MPa,and the interface experienced deflection due to plastic deformation in the titanium matrix,causing cracks to propagate into the titanium matrix and resulting in fractures. When rolled at 900 ℃,the lowest interfacial shear strength is only 160 MPa,and the diversification of brittle compounds leads to brittle fracture of the interface under shear stress.
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