Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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The Effects of Thermosolutal Convection on Macrosegregation during Alloy Solidification

합금응고과정에서 이중확산대류가 거시편석에 미치는 영향

  • 이균호 (한국항공우주연구원 위성사업부 위성제어연구 그룹 추진계) ;
  • 목진호 (연세대학교 전산응용재료공정설계센터) ;
  • 이진호
  • Published : 2001.10.01
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Abstract

Numerical investigation is made to study the effects of thermosolutal convection on the formation of macrosegregation in a Pb-Sn alloy solidification process in a two dimensional confined rectangluar mold. The basic equations are sovled using the Contrinum Model theory with the SIMPE algorithm during the solidification process. In addition, to track the liquid-solid interface with time variations, the moving boundary condition was adopted and moving irregular interface shapes were treated with the time-dependent, boundary-fitted coordinate system. As the temperature reduces 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 occurs in the mushy region and forms the complicated macrosegregation maps. belated to this phenomena, effects on the macrosegregation formation depending on the cooling condition and gravity values are examined.

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References

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