engleski

Influence of Solidification Rate on the Nodule Degeneration in Ductile Iron

Characteristic nodular form of graphite in ductile irons is achieved by inoculation and nodulation with magnesium and rare earth elements addition to the melt before or during pouring process. This contributes to the improvement of properties such as castability, strength and toughness of ductile iron. The properties of ductile iron are mainly influenced by alloying elements, casting technology, wall thickness and solidification rate which can affect the shape of graphite and metal matrix transformation. Graphite form in ductile irons is controlled by the growth through eutectic solidification till the eutectoid transformation temperature. Graphite nodule degeneration occurs in thick-walled castings due to the carbon diffusion on graphite nodules during slow cooling. In order to ensure required properties of ductile iron the focus of investigation will be on the mechanism of graphite growth, solidification and degeneration under different solidification conditions.

ductile iron, graphite growth, solidification rate, wall thickness

nije evidentirano