| C65600(CuSi3Mn)is a dissimilar metal welding material with excellent performance.However,due to its solid-liquid phase line width,strict requirements on production process parameters have brought difficulties to actual continuous casting production.Computer numerical simulation technology is not limited by on-site process conditions.The input information is simple and the output result is wide,which makes the numerical simulation technology closely participate in the practice of production process improvement.This subject takes the continuous casting process of copper alloy for C65600 welding as the simulation object.Based on the material composition and the thermodynamic model of the casting simulation software ProCast,the database of the high-temperature thermal and mechanical properties of the C65600 alloy was calculated.The three-dimensional heat transfer mathematical model,elastoplastic constitutive equation and dendrite growth model of the upper casting process of the alloy were established,and the heat flow and thermal-mechanical coupling solution of the process were solved by the finite element method.The MiLE method and C language secondary development were used for simulation calculations.The effects of different process parameters on temperature and stress were studied,and the impact on slab quality was determined,which provided a basis for controlling the slab quality.research shows:(1)The higher the slab uptake temperature,the higher the liquid phase temperature at the center of the slab at the same position,the longer the slab begins to solidify,the farther away from the crystallizer inlet,the longer the liquid chamber,and the longer the paste,the effect of strong cooling in the cold zone is basically unchanged.The starting position is far from the entrance of the crystallizer.The effect of continuous casting speed on the temperature of the liquid phase in the center of the slab,the solidification distribution and the state of the slurry zone are more obvious.The higher the continuous casting speed,the higher the liquid temperature in the center of the slab at the same position,and the farther away from the crystallizer inlet the starting point of solidification is,the higher the continuous casting speed,the longer the length of the liquid chamber,the longer the length of the slurry zone,and The distance between the beginning and end of the crystallizer entrance.(2)As the temperature rises,the equivalent stress of each part of the slab decreases;as the continuous casting speed increases,the equivalent stress of the slab surface increases,and the equivalent stress of other parts decreases.The upper temperature has little effect on the equivalent stress on the surface of the solidified slab.As the rising temperature and continuous casting speed increase,the slab air gap height decreases,the rising temperature has little effect on the air gap,and the air gap height decreases with increasing temperature;the continuous casting speed affects the air gap with The continuous casting speed increases and the air gap height decreases.(3)Increasing the average supercooling and absorption temperature can reduce the area of the central equiaxed crystal area and increase the grain size;increasing the nucleation density,the length of the cold area and the continuous casting speed can increase the central equiaxed crystal area to reduce the grain size.(4)Comprehensive calculation results to get the best process parameter range: recommended silicon content 3wt%,manganese content 1.2wt%,absorption speed 3mm/s-5mm/s,absorption temperature 1040?-1140?,length of the first cold zone 47mm-70 mm.Using the optimized technology,we successfully produced a qualified C65600 continuous casting billet.The surface has no cracks,bulging,scratches and other defects,and the internal quality is good to meet the production needs. |
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