Effects of different microsegregation models on solidification end point and macrosegregation for 82B cord steel
During the continuous casting process of steel,the microsegregation and macrosegregation will caused by the uneven distribution of solute elements.It should be noted that the macrosegregation in the billet cannot be re-moved by the subsequent heat treatment or rolling process,and it affects the product properties.Therefore,it is of great significance to simulate the macrosegregation by considering the microsegregation behavior,which aims at en-chancing the simulation accuracy of macrosegregation,and improving the quality of billet and the performance of products.In this work,a macrosegregation model that couples microsegregation behavior in order to compare mac-rosegregation behavior with different microsegregation models was established.The best solute microsegregation will be chosen,and accurate prediction of solute macrosegregation behavior in continuous casting billet will be real-ized.Besides,the Won-Thomas microsegregation model was used to investigate the effects of secondary dendrite arm spacing on the solidification end point and macrosegregation defects for 82B cord steel billets,when the spacing of the secondary dendrite arms is reduced from 200 mm to 40 mm,the solidification end point is shifted forward by 1.4 m,and the carbon mass fraction in the center of the continuous casting billet decreases from 0.154％to 0.138％,indicating that the larger the spacing of the secondary dendrite arms,the slower the cooling and the more serious the segregation,and the rationality and reliability of the model were verified through a carbon sulfur analyzer.
continuous castingmicrosegregationmacrosegregationsecondary dendrite armsolidification end point
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