On modelling of the effect of oxygen on graphite morphology and properties of modified cast irons

• Autorzy: Hampl J. , Elbel T.
• Języki publikacji: EN

Abstrakty

EN

Oxygen in graphitic cast irons substantially influences crystallization. The paper deals with results of experimental works concerning the influence of oxygen activities (a_o) and total oxygen content O_OX in cast irons, treated (modified) with master alloys NiMg and FeSiMg, on structural and mechanical properties of modified cast iron. The results show that in castings treated by Mg with subsequent inoculation FeSi strong reduction of total oxygen content in cast iron is observed. It corresponds to increasing residual content of Mg in castings and to the increase of tensile strength. The graphite morphology is connected with oxygen activity and total oxygen content in cast iron too. This decrease changes the morphology of graphite from flake to vermicular and spheroidal morphology. Increase of ultimate tensile strength of modified cast irons in consequence of greater amount of added Mg and consequently higher values of Mg_res too were observed what correlates with decreasing oxygen content in cast iron. This trend expressed by linear dependencies is valid for all melts.

Słowa kluczowe

EN

activity of oxygen; cast iron; modification

PL

tlen aktywny; żeliwo; modyfikacja

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2010
• Tom: Vol. 10, iss. 4
• Strony: 55--60
• Opis fizyczny: Bibliogr. 7 poz., rys., tab., wykr.

Twórcy

autor

Hampl J.

• VSB – Technical University of Ostrava, 17. listopadu 15, 708 33 Ostrava-Poruba, Department of Foundry Engineering, FMMI

autor

Elbel T.

• VSB – Technical University of Ostrava, 17. listopadu 15, 708 33 Ostrava-Poruba, Department of Foundry Engineering, FMMI

Bibliografia

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• [4] J. Šenberger, A. Záděra, T. Elbel, Aktivita kyslíku v litinách během tavení a odlévání, Slévárenství, LIII, No 7/8 (2005) 308 – 312.
• [5] T. Elbel, J. Šenberger, A. Záděra, L. Kocián, Study of the occurrence and suppression on metal reoxidation in ferrous castings, International Foundry Research journal / Giessereiforschung 59, No 4 (2007) 32 – 37.
• [6] J. P. Hrusovsky, J. F. Wallace, Effect of composition on solidification on compacted graphite iron, AFS Transactions, vol. 93 (1985) 55 – 86.
• [7] T. Elbel, J. Hampl, Influence of Al and Ti on microstructure and quality of compacted graphite iron castings, Metalurgija/Metallurgy, vol. 48, No 4 (2009) 243 – 248.