Study On Microstructure And Mechanical Properties Of Ti/Steel Clad Plates With V+Cu Interlayers

Titanium/steel composite board has more and more applications in production and life due to its good corrosion and corrosion resistance.At the interface of directly composited titanium/steel clad plates,brittle and hard intermetallic compounds are easily formed,which leads to a decrease in the mechanical properties of the clad plates.In order to prevent the formation of intermetallic compounds and improve the performance of the composite board,this article selected vanadium and copper as the intermediate layer materials,and the vacuum rolling composite method was used to prepare the vanadium+copper intermediate layer titanium/steel composite board and heat treatment with different annealing temperatures and time.Subsequently,laboratory scanning equipment such as scanning electron microscope and X-ray diffractometer were used to perform interface scanning,energy spectrum analysis,EBSD analysis and phase analysis experiments on the titanium/steel clad plates in different states.The cutting experiment tested the mechanical properties of the composite board.After analyzing and discussing the experimental data,the conclusions are as follows:The analysis of the interface of the vanadium+copper intermediate layer titanium/steel clad plates at different rolling temperatures shows that there are no holes and cracks at each interface of the titanium/steel clad plates,the interface is clear,and each interface achieves a good metallurgical combination.The elements at the Ti-V,V-Cu and Cu-Fe interfaces diffused together,forming a diffusion layer with a certain thickness during the hot rolling compound process;the higher the rolling temperature,the thicker the diffusion layer at each interface.When the rolling temperature is 950?,the titanium/steel clad plates titanium and the steel matrix on both sides have obvious dynamic recrystallization,the rolled structure disappears,the titanium side is composed of larger equiaxed grains,and the steel side is composed of the size The composition of smaller equiaxed grains,the clad plates at this time has the lowest strength and the largest elongation.When the rolling temperature is 850?,900?and 950?,the interface bonding strength is 203.1MPa,257.7MPa and 157.5MPa,which are higher than the national standard.The tensile shear fracture morphology showed that the fracture method of the clad plates rolled at 850?and 900?was brittle fracture,and the clad plates rolled at950?were plastic fracture.Tensile shear fracture XRD phase test results show that the addition of vanadium and copper intermediate layers effectively prevents the interdiffusion of Fe,Ti and C atoms,and no brittle Ti Fe,Ti Fe₂and Ti C metals are detected at the interface Compound.The interface of the vanadium+copper intermediate layer titanium/steel clad plate treated with different annealing temperatures and times still achieves a good metallurgical bond.There are no holes and cracks at the interface,and the interface is clear.As the annealing temperature increases and the holding time increases,compared with the rolled clad plates,the higher the degree of interdiffusion of the elements at the interface of the titanium/steel clad plates after annealing,the thicker the diffusion layer and the formation of more solid solution.With the extension of annealing temperature and holding time,the interface bonding strength and tensile strength of the decomposed composite board gradually decrease,and the elongation increases.The recovery and recrystallization phenomena during the annealing process are the main reasons for the changes in the mechanical properties of the composite board.