Issues »  Volume 36, Issue 1

Investigation of the Influence of Melt Stirring on the Formation of Macro- and Microstructures

A. G. Borisov

Physical-and-Technological Institute of Metals and Alloys NAS of Ukraine, 34/1 Academician Vernadsky Blvd., UA-03680 Kyiv-142, Ukraine

Received: 20.05.2013; final version - 25.09.2013. Download: PDF

Processes of structure formation during crystallization of AK7ch alloy under stirring are studied. Experiments were carried out in two regimes–cooling of samples on air and in water. Cooling rates were 4.1°C/s and 40.7°C/s from filling of the probe to liquidus temperature, respectively. Maximum possible duration of stirring up to skeleton formation was 55 s and 6 s. As determined in both cases, there is reduction of grain size with increase of stirring time. At the same time, behaviour of internal grain morphology essentially differs. When cooling on air, classic dendrite morphology forming without stirring is replaced by non-dendrite rosette-like, while, when cooling in water, structure remains dendrite within the whole interval of stirring duration studied. It seems that difference in behaviour is caused by difference in crystal-growth rates.

Key words: macrostructure, microstructure, dendrite, non-dendrite structure.

URL: http://mfint.imp.kiev.ua/en/abstract/v36/i01/0127.html

DOI: https://doi.org/10.15407/mfint.36.01.0127

PACS: 64.70.dg, 68.70.+w, 81.10.Aj, 81.10.Fq, 81.30.Fb, 83.60.-a

Citation: A. G. Borisov, Investigation of the Influence of Melt Stirring on the Formation of Macro- and Microstructures, Metallofiz. Noveishie Tekhnol., 36, No. 1: 127—137 (2014) (in Russian)

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