Proceedings of the KSME Conference (대한기계학회:학술대회논문집)
- 2000.04b
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- Pages.37-44
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- 2000
The Effects of Natural Convection on Macrosegregation during Alloy Solidification
합금 응고과정에서 자연대류가 거시편석에 미치는 영향
- Published : 2000.04.20
Abstract
Numerical investigation is made to study the effects of natural convection on the formation of macrosegregation of a Pb-Sn alloy solidification process in a 2-D confined rectangle mold. The governing equations are calculated using previous continuum models with SIMPLE algorithm doring the solidification process. In addition. to track the solid-liquid interface with time variations. the moving boundary condition Is adopted and irregular interface shapes are treated with Boundary-Fitted Coordinate system. As the temperature reduce from the liquidus to the solidus, the liquid concentration of Sn. the lighter constituent, increases. Then the buoyancy-driven flow due to temperature and liquid composition gradients, called thermosolutal convection or double diffusion, occurs in the mushy region and forms the complicated macrosegregation maps. Related to this phnomena, effects on the macrosegregation formation depending on the cooling condition and gravity values are described.
Keywords
- Solid-liquid Interface;
- Continuum Model;
- SIMPLE Algorithm;
- Macrosegregation;
- Thermosolutal Convection;
- Boundary-Fitted Coodinate System