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Effect of Bismuth and Rare Earth Elements on Graphite Structure in Different Section Thicknesses of Spheroidal Graphite Cast Iron Castings

Glavas Z., Strkalj A., Maldini K., Kozina F.

Archives of Metallurgy and Materials

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2018

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Vol. 63, iss. 3

1547--1553

EN

Effects of additions of 0.00064, 0.001 and 0.0042 wt.% Bi on the graphite structure in the section thicknesses of 3, 12, 25, 38, 50, 75 and 100 mm of spheroidal graphite cast iron castings containing 2.11 wt.% Si and rare earth (RE) elements (Ce + La + Nd + Pr + Sm + Gd) in the range from 0.00297 to 0.00337 wt.% were analyzed in this paper. Addition of Bi was not necessary for obtaining high nodule count and nodularity higher than 80% in section thicknesses of 3, 12 and 25 mm. RE elements showed a beneficial effect on the nodule count and nodularity in these sections. Nodularity was below 80% in section thicknesses of 38, 50, 75 and 100 mm when Bi was not added. Detrimental effect of RE elements on graphite morphology in these sections was neutralized by adequate addition of Bi. Addition of 0.001 wt.% Bi (ratio of RE/Bi = 3.27) was enough to achieve nodularity above 80% in the section thickness of 38 mm. Nodularity was increased above 80% in section thicknesses of 50, 75 and 100 mm by addition of 0.0042 wt.% Bi (ratio of RE/Bi = 0.78). At the same time, Bi significantly increased the nodule count. Nodularity above 80% and the high nodule count in the section thicknesses of 75 and 100 mm were also achieved by using an external metallic chill in the mold. In this case, addition of Bi was not required.

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Morphology of graphite precipitates in austenitic ductile iron

Zarębski K., Putyra P., Khatemi B., Tabor A.

Archives of Foundry Engineering

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2011

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Vol. 11, iss. 2

149-152

EN

The final mechanical properties of cast iron depend on the nature and properties of the matrix and on the morphology of graphite precipitates. The article presents the results of studies of the structure of austenitic ductile iron with different nickel content. The studies include the identification and stereological description of graphite precipitates. The volume fraction of graphite in cast iron was determined in function of the size of the precipitates and the adopted shape coefficient of single particles, enabling the content of regular spheroids to be estimated.

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Struktura żeliwa EN-GJS-500-7 w zależności od materialów wsadowych

Bartocha D.

Archiwum Odlewnictwa

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2006

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R. 6, nr 22

33-40

PL

W pracy przedstawiono wyniki analizy ilościowej i jakościowej struktury żeliwa sferoidalnego EN-GJS-500-7 pochodzącego z pięciu wytopów zrealizowanych z użyciem różnych, pod względem jakości i rodzaju, materiałów wsadowych. Wyznaczono i porównano wartości parametrów opisujących strukturę grafitu badanego żeliwa.

EN

In the work results of quantitative and qualitative analysis of microstructure of ductile cast iron EN-GJS-500-7 have been presented. Cast iron was prepared in five melts that had been realized with different in quality and kind respect charge materiaIs. Values of parameters describes graphite's microstructure of tested cast iron have been determined and compared.