Effect Of Carbon Content And Process On Microstructure And Bonding Properties Of Titanium-Steel Composite Plate

The large-scale containers in China's energy industry have a reduced life due to severe corrosion.About 100,000 tons of composite container plates are urgently needed each year to solve the corrosion problem.However,the traditional explosion compound damages the environment and the performance is unstable.It is extremely urgent to develop rolling composite technology.In this paper,the titanium steel composite plate is simulated and rolled,and the composite interface properties and microstructure are studied.It contributes to the improvement of the composite plate theory system,supplements the key industrial manufacturing technology,and contributes to the high-performance container steel in China.In this paper,using gleeble-3500 thermal simulation test machine,the titanium steel composite plate is rolled and composited under the vacuum condition of <20 Pa,by changing the carbon content of the substrate(0.06%~0.20%),rolling temperature(800 °C~875 °C),rolling reduction(40%~80%)and different temperature annealing(550 °C~900 °C)for different samples of titanium steel composite panels;through OM,SEM,EDS,EPMA,EBSD,XRD and other analytical test methods were used to study the effects of different interface conditions on composite interfacial microstructure,elemental interdiffusion behavior and tensile strength of vertical interface.The results of the analysis show that:The interdiffusion behavior of Fe and Ti elements and the enrichment of C elements at the interface on both sides of the composite plate with different carbon content of different substrates,and the C element enriched at the interface with the increase of carbon content of the substrate In the four kinds of carbon,the main phases of the composite interface of the titanium steel composite plate are FeTi phase and TiC phase,and the fracture sites of the tensile specimens are all at the bonding interface.When the carbon content of the substrate is low,the composite interface is thicker and the tensile strength at the vertical interface is lower.When the carbon content of the substrate is higher,the composite interface becomes thinner and the tensile strength at the vertical interface increases.The research on different rolling processes shows that when the rolling temperature is 850 °C,the tensile strength of the vertical interface is the highest,which is 337 MPa.When the rolling temperature is lower than 850 °C,the composite interface has unbonded areas and the interface properties are poor.When the temperature is higher than 850 °C,the composite interface is well bonded.In addition,as the rolling reduction increases,the tensile strength of the composite interface gradually increases.When the rolling reduction is 80%,the interfacial tensile strength is the largest.The analysis of composite plates with different annealing conditions shows that when the heat treatment temperature is lower than 850 °C,the diffusion distance of Ti increases with the increase of heat treatment temperature,the diffusion distance of Fe element is basically unchanged,and the aggregation of C element at the interface The tensile strength of the interface increases gradually.When the heat treatment temperature is higher than 850 °C,the diffusion of Fe and Ti is more intense with the increase of temperature,the aggregation of C element is weakened,and the tensile strength is decreased.