Computer evaluation of the influence of liquid metal movements on defects formation in the casting

Leszek Sowa,Tomasz Skrzypczak,Paweł Kwiatoń,I Malujda,D Wojtkowiak,Ł Warguła,M Berdychowski,M Dudziak,D Wilczyński,P Krawiec,J Górecki,K Talaśka

doi:10.1051/matecconf/201925402017

Leszek Sowa, Tomasz Skrzypczak + Show 10 more

Open Access

https://doi.org/10.1051/matecconf/201925402017

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Abstract

This paper concerns the modelling of the solidification process including the phenomena of heat transfer and fluid flow during the initial stage of the metal casting process. During this period, the molten metal motions have an essential influence on solidification kinetics. An analysis of solidification kinetics, by determining the velocity and temperature fields in a system of riser-casting was made. Velocity fields were obtained by solving the momentum equations and the continuity equation, while the thermal fields were obtained by solving the conduction equation containing the convection term. After completion of the filling process the main solidification of molten metal takes place and its shrinkage. The phenomenon of casting shrinkage cannot be avoided, but it is possible to minimize its negative effects on the casting quality. One with ways to solve this problem is to design the mould in such a way that the solidification proceeds in accordance to the assumed direction and finished in the riser. Generally, the aim of search is to obtain a casting without shrinkage defects.

Highlights

Producing a casting the high quality is not easy to achieve, the need for continuous improvement of casting methods
The heat transfer and fluid flow phenomena, proceeding in the mould cavity during filling and after the filling is finished until the completion of solidification, were analysed
If this line does not close, the process of solidification proceeds correctly, whereas if this line closes, the solidifying casting is divided into smaller areas with a difficult inflow of liquid metal to them, which results in the creation of a shrinkage cavity in this place (Fig 9)

Summary

Introduction

Producing a casting the high quality is not easy to achieve, the need for continuous improvement of casting methods. The casting solidification process is mainly analysed taking into account the heat transfer and fluid flow phenomena in the initial stage of casting process of the cast steel in a metal mould. During this period, the molten metal motions have an essential influence on solidification kinetics. The molten metal motions have an essential influence on solidification kinetics This requires the formulation of adequate mathematical model that takes into account the mutual influence of thermal and flow phenomena in the process of filling the cavity of the casting mold and after its completion [2, 4,5,6,7]. Focus in their research on the analysis of the formation and evolution of a shrinkage cavity or other defects of the casting process [3, 10,11,12]

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