Validation of a Multiphase Model for the Macrosegregation and Primary Structure of High-Grade Steel Ingots

Autor: László Könözsy, Wolfgang Schützenhöfer, H.-P. Fauland, Robert Tanzer, Menghuai Wu, A. Ishmurzin, G. Reiter, Andreas Ludwig
Rok vydání: 2008
Předmět:
Zdroj: Metallurgical and Materials Transactions B. 40:305-311
ISSN: 1543-1916
1073-5615
Popis: A mixed columnar-equiaxed solidification model is used to predict the macrosegregation in high grade steel ingots. In this model, three phases are considered: the melt; the columnar phase, which is assumed to be stationary; and the equiaxed phase, which is free to move. With this approach, the model is able to simulate the evolution of the primary solid phase distributions including the columnar-to-equiaxed transition, the melt convection and the grain sedimentation, and their influence on the macrosegregation. Thermodynamic information of a ternary alloy (Fe-C-Cr) is simplified by the piecewise linearization of the phase diagram around the suitable compositions in the ferritic and austenitic regions. As a result, macrosegregation of carbon and chromium has been analyzed. As the first step, the validation of the numerical model was performed on a benchmark ingot of a laboratory scale. Computed macrosegregation and primary structure were compared with measurements and good agreement was obtained.
Databáze: OpenAIRE
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