Influence of annealing on the microstructure, interfacial compounds and mechanical properties of hot rolling bonded Ti/steel clad plate with bimetallic interlayered steel and vanadium

摘要

Ti and steel were rolling bonded using interstitial free (IF) steel and vanadium (V) as interlayers. The as-rolled clad plates were subjected to different post-rolling annealing treatments. The microstructures, interfacial compounds and mechanical properties of the as-rolled and annealed clad plates were investigated. The experimental results show that recovery and recrystallization processes occurred in the clad plates during the annealing process. The degree of recovery and recrystallization increased with the increase of holding time and annealing temperature. In addition, vanadium carbides first appeared in the a phase and then formed continuously along the V/IF steel interface. The tensile shear strength and the tensile strength of the annealed clad plates decreased with the increased annealing temperature and holding time. Reductions in the strength are mainly attributed to the recovery and recrystallization processes. In addition, the co-existence of the a phase and vanadium carbides between the V and IF steel interlayers and the diffusion-induced interfacial voids may also weaken the annealed clad plate strength.