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2 Archives of Metallurgy and Materials

2 2017

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Numerical Model of SiC Particle Interaction with Solidification Front in AZ91/(SiCp) Composite

Żak P. L., Kalisz D., Rączkowski G.

Archives of Metallurgy and Materials

2017

Vol. 62, iss. 3

1625--1628

Presented work focused on the movement of SiC particles in the vicinity of the solidification front in AZ91/(SiC)p composite. Authors describe the mathematical model that governs this phenomenon. On the base of following numerical model own computer program was prepared. The behavior of a particle moving parallel to the solidification front was analyzed. Three variants of local velocity gradient of liquid metallic phase were analyzed for a particle of radius 10, 50 and 100 μm. At a bigger velocity gradient the SiC particle was observed to go down quicker and to move towards the solidification front. This effect was stronger for SiC particles, which had a bigger radius, i.e. 100 and 50 μm.

Interaction mechanism of non-metallic particles with crystallization front

Żak P. L., Kalisz D., Rączkowski G.

Archives of Metallurgy and Materials

2017

Vol. 62, iss. 1

205--210

The process of steel solidification in the CCS mould is accompanied by a number of phenomena relating to the formation of non-metallic phase, as well as the mechanism of its interaction with the existing precipitations and the advancing crystallization front. In the solidification process the non-metallic inclusions may be absorbed or repelled by the moving front. As a result a specific distribution of non-metallic inclusions is obtained in the solidified ingot, and their distribution is a consequence of these processes. The interaction of a non-metallic inclusion with the solidification front was analyzed for alumina, for different values of the particle radius. The simulation was performed with the use of own computer program. Each time a balance of forces acting on a particle in its specific position was calculated. On this basis the change of position of alumina particle in relation to the front was defined for a specific radius and original location of the particle with respect to the front.