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S18 Processos Mecânico-Metalúrgicos |
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Title:
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MODELING SOLIDIFICATION AND MUSHY ZONE DEFORMATION OF ALLOYS
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Summary :
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THE DEFORMATION OF THE PARTIALLY SOLIDIFIED STRAND DURING NEAR NET SHAPE CONTINUOUS CASTING OF THIN SLABS IS ONLY ONE EXAMPLE OF A TECHNOLOGICALLY IMPORTANT PROCESS WHERE A MUSHY ZONE IS MECHANICALLY ALTERED IN ORDER TO ACHIEVE IMPROVED GRAIN STRUCTURES AND HOMOGENEITY. HOWEVER, THE PHENOMENA OCCURRING DURING PLASTIC DEFORMATION OF A SOLIDIFYING MUSH ARE POORLY UNDERSTOOD, HAVE NOT BEEN OBSERVED DIRECTLY, AND HAVE NOT BEEN MODELED IN DETAIL. A MATHEMATICAL MODEL THAT PREDICTS THE TEMPERATURE AND SOLID FRACTION PROFILES, LIQUID CONCENTRATION EVOLUTION, AND SOLID PHASE DISPLACEMENT DURING THE DEFORMATION OF A SOLIDIFYING MUSH IS PRESENTED. THIS MODEL IS DERIVED CONSIDERING A TWO-DIMENSIONAL CASE, THE VOLUME AVERAGING METHOD, THE ENTHALPY TECHNIQUE, AND A COORDINATE TRANSFORMATION TO AVOID A CHANGING MESH IN A NUMERICAL SOLUTION. THE NUMERICAL RESULTS ARE FOUND TO MATCH THE EXPERIMENTAL BEHAVIOR OF METALLIC ALLOYS DURING SOLIDIFICATION WITH OR WITHOUT DEFORMATION.
KEY WORDS: NEAR NET SHAPE, SOLIDIFICATION, DEFORMATION, VOLUME AVERAGING, AND MODELING.
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Author :
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Beckermann, C. 0
Raghavendra, V. 0
Rizzo, Ernandes M. S.
Santos, Rezende Gomes dos
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Paper View :
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COBEM99
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