Prediction of Microstructure of Grey Cast Irons by Electrical Resistivity Measurements

• Autorzy: Petrič M. , Mrvar P. , Kastelic S.

Identyfikatory

DOI

10.24425/amm.2019.126261

• Języki publikacji: EN

Abstrakty

EN

The paper describes the influence of graphite shape, size and amount to electrical properties of different cast irons. Experiments of electrical resistivity measurements were conducted during solidification of four different melts in different time intervals from melt treatment by inoculation and nodularization. Metallographic analyses were made in order to determine the shape, size, distribution and amount of graphite and correlate results with electrical resistivity measurements. It was found out that nodular graphite is giving the lowest electrical resistivity and is decreased during solidification. Electrical resistivity of lamellar cast iron is increased during solidification since lamellas interrupt metal matrix severely. There is no significant difference in resistivity of vermicular cast iron from nodular cast iron. Smaller size of graphite and lower amount of graphite and higher amount of metal matrix also decrease resistivity.

Słowa kluczowe

EN

solidification; grey cast iron; electrical resistivity; graphite shape; microstructure

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2019
• Tom: Vol. 64, iss. 1
• Strony: 365--369
• Opis fizyczny: Bibliogr. 7 poz., fot., rys., tab.

Twórcy

autor

Petrič M.

• University of Ljubljana, Faculty of Natural Sciences and Engineering, Ljubljana, Slovenia

autor

Mrvar P.

• University of Ljubljana, Faculty of Natural Sciences and Engineering, Ljubljana, Slovenia

autor

Kastelic S.

• University of Ljubljana, Faculty of Natural Sciences and Engineering, Ljubljana, Slovenia

Bibliografia

• [1] A. R. Sinigoj, Basics of Electromagnetics, Publisher of Faculty of Electrical engineering and Faculty for Computer and Information Science (in Slovenian), Ljubljana (1999).
• [2] T. E. Faber, An introduction to the theory of liquid metals, Cambridge University Press, New York (1972).
• [3] L. Weber, C. Fischer, A. Mortensen, On the influence of the shape of randomly oriented, non-conducting inclusions in a conducting matrix on the effective electrical conductivity, Acta Materialia 51, 495-505 (2003).
• [4] L. Weber, J. Dorn, A. Mortensen, On the electrical conductivity of metal matrix composites containing high volume fractions of non-conducting inclusions, Acta Materialia 51, 3199-3211 (2003).
• [5] D. M. Stefanescu, S. T. Craciun, Bestimmung der graphitform im gusseisen durch messung des spzifischen elektrischen widerstandes waehrend der erstarrung, Giesserei-praxis 11, 197-200 (1973).
• [6] D. M. Stefanescu, H. Weingert, Einfluss des graphits und der metallischen grundmasse auf den spezifischen elektrischen widerstand von gusseisen mit lamellen-bzw. Kugelgraphit, Giesserei-praxis 14, 256-261 (1971).
• [7] M. Petrič, S. Kastelic, P. Mrvar, Selection of electrodes for „in situ” electrical resistivity measurements of molten aluminium, Journal of Mining and Metallurgy - Section B-Metallurgy 49 (3), 279-283 (2013).

Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).