Four-Phase Dendritic Model for the Prediction of Macrosegregation, Shrinkage Cavity, and Porosity in a 55-Ton Ingot

作者：Ge, Honghao; Ren, Fengli; Li, Jun; Han, Xiujun; Xia, Mingxu; Li, Jianguo

来源：Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science, 2017, 48A(3): 1139-1150.

DOI：10.1007/s11661-016-3910-z

• EQUIAXED SOLIDIFICATION
• CHANNEL SEGREGATION
• 3-PHASE MODEL
• HEAT-TRANSFER
• STEEL INGOTS
• SIMULATION
• CASTINGS
• COLUMNAR
• CONVECTION
• FLOW

A four-phase dendritic model was developed to predict the macrosegregation, shrinkage cavity, and porosity during solidification. In this four-phase dendritic model, some important factors, including dendritic structure for equiaxed crystals, melt convection, crystals sedimentation, nucleation, growth, and shrinkage of solidified phases, were taken into consideration. Furthermore, in this four-phase dendritic model, a modified shrinkage criterion was established to predict shrinkage porosity (microporosity) of a 55-ton industrial Fe-3.3 wt pct C ingot. The predicted macrosegregation pattern and shrinkage cavity shape are in a good agreement with experimental results. The shrinkage cavity has a significant effect on the formation of positive segregation in hot top region, which generally forms during the last stage of ingot casting. The dendritic equiaxed grains also play an important role on the formation of A-segregation. A three-dimensional laminar structure of A-segregation in industrial ingot was, for the first time, predicted by using a 3D case simulation.

• 出版日期2017-3
• 单位上海交通大学