Elimination of Chunky Graphite in Castings with Large Thermal Points

• Autorzy: Futas P.
• Języki publikacji: EN

Abstrakty

EN

The presence of the chunky graphite is unwanted in the cast iron with the spheroidal graphite for this significantly lowers the properties of the ductile iron. This shape of the graphite is formed as the result of the slow cooling rate of the castings with large thermal point and also due to the presence of the elements which suppress the formation of the spheroidal graphite and support formation of the chunky graphite. The spheroidal graphite present in the ductile iron assures the excellent mechanical properties, while the chunky graphite significantly reduces those properties of the ductile iron. Therefore it is of importance to assume conditions under which prevented is the formation of the chunky graphite. The casts were carried out under the conditions of the regular operation of the foundry and tested were various types of modifiers and inoculators and also pre-inoculators containing the elements suppressing the formation of the chunky graphite (Al, Sb a Ba). Applied were also the chromium breaker core to suppress the formation chunky graphite which was present in the structure in the places after the feeders elimination. As whole, executed were eight casts with various types of the modifiers and inoculators.

Słowa kluczowe

EN

ductile iron; chunky graphite; cooling rate; thermal point

PL

żeliwo sferoidalne; szybkość chłodzenia; punkt termiczny

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2016
• Tom: Vol. 16, iss. 4
• Strony: 57--60
• Opis fizyczny: Bibliogr. 6 poz., rys., tab.

Twórcy

autor

Futas P.

• Institute of Metallurgy, Faculty of Metallurgy, Technical University of Košice, Letná 9, 004001 Košice, Slovakia

Bibliografia

• [1] Zhe, L., Weiping, Ch. & Yu, D. (2012). Influence of cooling rate and antimony addition content on graphite morphology and mechanical properties of a ductile iron. China Foundry. 9(2), 114-118.
• [2] Falat, L., Čiripová, L., Kepič, J., Buršík, J. & Podstranská, I. (2014). Correlation between microstructure and creep performance of artensitic/austenitic transition weldment in dependence of its post-weld heat treatment. Engineering Failure Analysis. 40, 141-152.
• [3] Falat, L., Kepič, J., Čiripová, L., Ševc, P., & Dlouhý, I. (2016). The effects of postweld heat treatment and isothermal aging on T92 steel heat-affected zone mechanical properties of T92/TP316H dissimilar weldments. Journal of Materials Research. 31, 1532-1543.
• [4] Karsay, S.I. (1992). Gusseisen mit Kugelgraphit I., QIT-FER ET TITANE INC.
• [5] Nakae, H., Jung, S. & Shin, H.C. (2008). Formation mechanism of chunky graphite and its preventive measure. J. Mater. Sci. Tech. 24, 289-295.
• [6] Basutkar, P.K., Loper, C. R. (1971). Predicting graphite nodularity in heavy section ductile iron by thermal analysis. AFS report of research project. pp. 1-17.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.