Finite Element Analysis And Microstrusture Simulation Of Continious Casting Slab Solidification Process

With the development of the iron and steel industry,the requirement of the society on the quality of steel products is constantly improved,and the quality of continuous casting billet has a huge impact on the quality of steel products.Therefore,the research on continuous casting billet and continuous casting process is of great significance.Taking No.50 steel produced in a steel plant in tangshan as the research object,finite element analysis and microstructure simulation of continuous casting slab solidification process were carried out by using Procast large scale casting simulation software.The thermodynamic coupling model of the billet in the mould was established.In the solidification process of the billet,the temperature at the corner of the billet decreases the fastest,and the stress at the corner is obviously higher than that at other positions.By changing the pouring temperature and casting speed,and simulates the mould in slab surface under different process conditions,the temperature stress distribution at various points in the same time,each location corresponding to the slab surface temperature with the increase of pouring temperature(throwing speed)increases,on the contrary,each location corresponding to the slab surface stress as the pouring temperature,casting speed)and the rise of.The steady state simulation of continuous casting process is carried out and the steady state temperature field model and solid rate model of solidification process are obtained.The variation of central temperature field,solid phase ratio,starting and ending position of paste zone,length of paste zone and other factors in different secondary cooling strength,casting speed and casting temperature were studied.The higher the secondary cooling strength is,the lower the central temperature is when the billet reaches steady state,the closer the paste area is to meniscus,and the shorter the length of paste area is.The faster the casting speed is,the higher the central temperature is when the casting billet reaches the steady state.The starting and ending positions of the paste zone are far away from the meniscus,and the longer the length of the paste zone is.The higher the casting temperature is,the higher the central temperature will be when the slab reaches the steadystate.The starting and ending positions of the paste zone are far away from the meniscus,and the length of the paste zone remains unchanged.The microstructure of the billet under different process conditions and different nucleation parameters was simulated and observed,and the conclusion was drawn: with the increase of casting temperature,the proportion of columnar crystals in the microstructure of the billet increased,while the proportion of equiaxed crystals decreased.With the increase of casting speed,the proportion of columnar crystal decreased and that of equiaxed crystal increased.With the increase of average nucleation supercooling degree,the proportion of equiaxed crystals decreases,the proportion of columnar crystals increases and the grain size increases.With the increase of the maximum nucleation density,the proportion of equiaxed crystal increases,the proportion of columnar crystal decreases and the grain size decreases.