Abstract
In industrial conditions, ductile iron was prepared and two molds were made, in which a 600mm thick plate was formed. Filling system for one mold was placed vertically and for the second -horizontally. In order to obtain cooling curves, "S" type thermocouples have been placed in the mold. After cooling the casts, the samples from the fixing points of thermocouples were cut by the trepanning method. In the "vertical" cast sample shrinkage porosity was observed, while in the "horizontal" cast sample no porosity was detected. A significant difference in the recorded temperature in the center of the casts was discovered, indicating a defect in "vertical" cast.
Highlights
Slag ladle or slag pot (Fig. 1) belong to the group of massive and thick-walled casts. Their shaping microstructure is significantly different from the castings with smaller dimensions, which in turn can lead to elements segregation and shrinkage porosity [1-7]
Crystallization of heavy-section casting affects the final quality of cast iron castings, because off its wall thickness and longer cooling time
Due to the fact that these castings are exposed to thermal loads during usage and must be characterized by adequate strength, it is important to properly carry out the casting process
Summary
Slag ladle or slag pot (Fig. 1) belong to the group of massive and thick-walled casts Their shaping microstructure (during crystallization) is significantly different from the castings with smaller dimensions, which in turn can lead to elements segregation and shrinkage porosity [1-7]. The method of preventing this defect is the appropriate metallurgical quality of the metal [8], and the appropriate mould technology Increasing demand for this type of castings requires more extensive research in this area. Due to the fact that these castings are exposed to thermal loads during usage and must be characterized by adequate strength, it is important to properly carry out the casting process It can be made of various grades of cast iron, but to make extend service life, it should be made of GJS cast irons, which, unlike the GJL grade, contain nodular graphite (Fig. 2) instead flake graphite (Fig. 3).
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