Numerical Simulation And Experimental Research On Macro And Microstructure Of Copper Alloy In Twin-roll Strip Casting

The twin roll strip casting of copper alloy technology is one of the final state shaping technology,a short cycle,high efficiency,energy saving,low cost advantages,and roll out the strip of tiny grains,low degree of segregation,uniform distribution,but the research is not thorough,in the field of cast-rolling process decided to copper alloy strip of solidified structure,and organization of solidification and decided to take a final quality,thin Therefore,understanding and controlling the solidification process of thin strips can effectively improve the solidification microstructure and macroscopic defects,and then improve the comprehensive properties of thin strips.The solidification of thin tape is a complex and opaque process.Traditionally,the research on the solidification structure of thin tape is mainly based on a large number of experiments,but it requires a lot of manpower and financial resources,which increases the experimental period,and it is difficult to accurately analyze the solidification process of thin tape.Therefore,in this paper,the evolution mechanism of solidification microstructure in different casting and rolling process parameters T2 copper molten pool was studied by casting and rolling experiment combined with computer numerical simulation.Based on the E-Stop technology of the ?265×160 twin-roll thin strip casting and rolling mill,the solidification structure of the T2 copper alloy molten pool area was successfully obtained,and the texture appearance,grain evolution and dendrite growth orientation were analyzed.The solidification structure was determined by the surface layer of small equiaxed crystals and small columnar crystals extend and grow along the <100> direction.Some crystal grains are gradually eliminated in the competitive growth,and the cross section is in the shape of a "herringbone".The CAFE heat-flow-structure coupling model of twin-roll thin strip continuous casting copper alloy is established based on CA and FE theory,and the effect of casting temperature,interfacial heat transfer coefficient of crystallizing roll and molten pool height on the solidification structure of T2 copper in the molten pool area is explored.mechanism.The CAFE model is basically consistent with the experimental results.Studies have shown that the position of the kiss point is the main influencing factor that affects the dendrite structure.As the position of the kiss point moves downward,the proportion of columnar crystal regions decreases,and the solidification structure tends to be refined.This thesis further explored the influence of nucleation parameters on the morphology and distribution of structure grains based on the CAFE model,and provided a reference for the introduction of twin-roll strip casting with artificial nucleation technology.