期刊
COMPTES RENDUS MECANIQUE
卷 335, 期 5-6, 页码 330-335出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.crme.2007.05.010
关键词
fluid mechanics; directional solidification; dendrites; columnar grams; equiaxed; travelling magnetic fields; natural and forced convection
类别
In the field of the metallic alloy development, the main industrial goals are the control of the metallurgical structure and defects. Hydrodynamic movements in the liquid phase have a significant influence on properties of the solidified product. We focus our attention on two major effects influenced by forced convection induced by a travelling magnetic field: the macrosegregation and the grain structure for Al-3.5 wt% Ni alloys. We show that this configuration can control macrosegregations and that, moreover, the dendritic primary spacing maybe modified by varying the applied field. With regards to the grain structure, we exhibit the effect of the forced convection on the microstructure. For the equiaxed regime growth, the effect of the travelling magnetic field on the constitutional undercooling and on the refiner distribution induces an equiaxed to an elongated transition. This mechanism enhances the nucleation and the growth of equiaxed grains. In the case of non-refined alloys, a mode of elongated free grains is obtained most likely because of fragmentation. To cite this article: K. Zaidat et al., C. R. Mecanique 335 (2007). (C) 2007 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
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