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Crystallization of Eutectics in Fe-C-V-Si Alloys

Kawalec M

Archives of Foundry Engineering

2014

Vol. 14, iss. 1 spec.

143--146

This article addresses the results of microstructural examinations of the volume solidifying Fe–C–V–Si alloys containing carbon in the range of 1.39÷1.76%, vanadium in the range of 6.77÷7.77% and silicon in the range of 0.02÷3.10. The melting charge was Armco iron, ferro-vanadium with 81.7 wt.%V, spectrally pure graphite and technically pure silica. It was shown that with increasing the silicon content, the microstructure of the resulting alloy changing. These changes include both a matrix the shape of the primary carbides and type of crystallizing eutectic. In the studied alloys was observed following eutectic: fibrous (crystallize as non-faceted/ non-faceted eutectic), complex regular (crystallize as faceted/ non-faceted eutectic), spiral (crystallize as faceted/ faceted eutectic). The results illustrated by the images of the microstructures made with an optical microscope and a scanning electron microscope.

Initial assessment of effectiveness of some selected inoculants for grey cast iron

Soiński M. S., Wawrzyniec A.

Archives of Foundry Engineering

2010

Vol. 10, iss. 2

155--158

The influence of four inoculants: FeSi75, Zircinoc, Foundry Grade, and Inogen has been determined in the work. The additions have been introduced in the amount of 0,2% into the cast iron exibiting the degree of saturation SC = 0,824. The shape, the size, and the arrangement of graphite precipitates have been determined, as well as the cast iron matrix type; both the initial cast iron and the modified alloy have been examined, the latter cast after either 2 or 8 minutes after the inoculation treatment. Additionally the chilling tendency of the cast iron has been assessed, the number of eutectic cells has been determined, and mechanical properties (strength and hardness) of the alloy have been examined. It has been found that each of the inoculants significantly lowers the cast iron chilling tendency, however not to the same degree. Additionally, the graphite arrangement is changed from interdendritic one present in the initial cast iron to the arrangement of prevailing A type revealed in the modified alloy. The inoculation treatment leads to the distinct growth in the number of eutectic cells and to the increasing of cast iron tensile strength, the latter however not to the large extent.

A visualization of the eutectic solidification process

Olejnik E., Fraś E.

Archives of Foundry Engineering

2007

Vol. 7, iss. 4

131-136

The study presents a visualization of the sequence of formation of eutectic grains during solidification in volume and directional solidification of model organic materials from the system of salol (faceted phase) - camphor (non-faceted phase) and carbon tetrabromide (non-faceted phase) - hexachloroethane (non-faceted phase). It has been proved that the faceted phase may act as a substrate for nucleation of the non-faceted phase, while the non-faceted phase in a eutectic grain is of polycrystalline character. The directional solidification of non-faceted/non-faceted eutectic enabled disclosing various structural defects, while solidification in volume explained in what way the, so called, halo effect is formed.