The Effects of Thermosolutal Convection on Macrosegregation during Alloy Solidification

- Journal title : Transactions of the Korean Society of Mechanical Engineers B
- Volume 25, Issue 10, 2001, pp.1337-1345
- Publisher : The Korean Society of Mechanical Engineers
- DOI : 10.22634/KSME-B.2001.25.10.1337

Title & Authors

The Effects of Thermosolutal Convection on Macrosegregation during Alloy Solidification

Lee, Gyun-Ho; Mok, Jin-Ho; Lee, Jin-Ho;

Lee, Gyun-Ho; Mok, Jin-Ho; Lee, Jin-Ho;

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.

Keywords

Alloy Solidification;Macrosegregation;Continuum Model;SIMPLE Algorithm;Thermosolutal Convection;Gravitational Effect;

Language

Korean

Cited by

3.

A Study on Development of the Three-Dimensional Numerical Model to Analyze the Casting Process: Mold Filling and Solidification,;

Journal of Mechanical Science and Technology, 2005. vol.19. 7, pp.1488-1502

References

1.

Beckermann, C. and Viskanta, R., 1993, 'Mathematical Modeling of Transport Phenomena during Alloy Solidification,' Appl. Mech. Rev., Vol. 46, pp. 1-25

2.

Bennon, W. D. and Incropera, F: P., 1988, 'Numerical Analysis of Binary Solid-liquid Phase Change Using a Continuum Model,' Numerical Heat Transfer, Vol. 13, pp. 277-296

3.

Bennon, W. D. and Incropera, F. P., 1987, 'A Continuum Model for Momentum, Heat and Species Transport in Binary Solid-liquid Phase Change Systems - I. Model Formulation,' Int. J. Heat Mass Transfer, Vol. 30, pp. 2161-2170

4.

Bennon, W. D. and Incropera, F. P., 1987, 'A Continuum . Model for Momentum; Heat and Species Transport in Binary Solid-liquid Phase Chan-e Systems - II. Application to Solidification in - Rectangular Cavity,' Int. J. Heat Mass Transfer, Vol. 30, pp. 217I-2187

5.

Patankar, S. V., 1980, Numerical Heat Transfer and Fluid Flow, Hemisphere Publishing Corporation, Washington

6.

Thomson, J. F., Warsi, Z. U. A. and Mastin, C. W., 1982, 'Boundary-Fitted Coordinates Systems for Numerical Solution of Partial Differential Equations A Review,' J. Comput. Phys., Vol. 48, pp. 1-108

7.

유호선, 노승탁, 1986, '좌표변환에 의한 상변화과정의 수치해석,' 대한기계학회논문집, 제10권, 제 4호, pp. 323-329

8.

이진호, 황기영, 1995, '수직응고시스템에서의 밀도차와 냉각률이 열전달 및 열응력에 미치는 영향,' 대한기계학회논문집, 제 19권, 제 4호, pp. 1095-1101

9.

D. J. Hebditch and J. D. Hunt, 1974, 'Observation of Ingot Macrosegregation on Model System,' Met. Trans., Vol. 5, pp. 1557-64

10.

N. Ahmad,. H. Combeau, L. J. Desbiolles, T. Jalanti' G. LesouIt, J. Rappaz, M. Rappaz and. C. Stomp,. 1997, 'Numerical Simulation of Macrosegregaion : A Comparison of FVM and FEM Prediction with Experiments,' Proceedings of the 4th Decennial International Conference on Solidification Processing, pp. 341-345

11.

이진호, 이균호, 목진호, 2000, '합금의 응고 과정에서 자연대류가 거시편석에 미치는 영향,' 대한기계학회 2000년도 춘계학술대회 논문집 B, pp. 37-44

12.

이진호, 목진호, 2000, '충전과정이 포함된 합금의 응고과정에서 주형두께의 영향,' 대한기계학회 2000년도 열공학부문 춘계학술대회 논문집, pp. 100-105

13.

Jinho Lee, Kyunho Lee, and Jinho! Mok, 2000, -The Effect of Natural Convection on Macrosegregation during Alloy Solidification,' Proceedings of the 4th JSME-KSME Thermal Engineering Conference, pp. 403-408