Mechanism of silicon influence on the chill of cast iron

• Autorzy: Fraś E. , Górny M.
• Języki publikacji: EN

Abstrakty

EN

In this work an analytical solution of general validity is used to explain mechanism of the silicon influence on the absolute chill tendency (CT) and chill (w) of cast iron. It is found that CT can be related to nucleation potential of graphite (N_v), growth parameter [my] of eutectic cells, temperature range (deltaT_sc) and the pre-eutectic austenite volume fraction (f_gamma). It has been shown that silicon additions: a) impede the growth of graphite eutectic cells, [my], b) expands the temperature range [delta]T_sc), c) increases the nucleation potential of graphite N_v, d) lowers the pre-eutectic austenite volume fraction, f_gamma and in consequence the absolute chilling tendency, CT decreases. The minimum wall thicknesses for chilled castings, or chill widths (w) in wedge shaped castings is related to CT and as silcon contents increases, the w value also increases.

Słowa kluczowe

EN

cast iron; structure; chilling tendency; chill

PL

żeliwo; struktura odlewu; chłodzenie

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2007
• Tom: Vol. 7, iss. 4
• Strony: 57--62
• Opis fizyczny: Bibliogr. 10 poz., rys., tab., wykr.

Twórcy

autor

Fraś E.

autor

Górny M.

• AGH - University of Science and Technology, Reymonta 23, 30-059 Kraków,

Bibliografia

• [1] Fuller, A.G., Effect of superheating on chill and mottle formation. B.C.I.R.A Journal of Research and Development, vol. 9, 693-708 (1961).
• [2] Boyes, J.W., Fuller, A.G., Chill formation in cast iron, B.C.I.R.A Journal of Research and Development, vol. 12, 424-431, (1964).
• [3] Girshovitz, N., Solidification and properties of cast iron. Mashinostroyene, Moscow-Leningrad (1966).
• [4] Dawson, J.V,. Maitra, S.,Recent research on the inoculation of cast iron, British Foundrymen, vol. 4, 117-127 ( 1976).
• [5] Fredriksson, H., Svenson, I.L., Computer simulation of the structure formed during solidification of cast iron. in The Physical Metallurgy of Cast Iron, H. Fredrickson and M. Hillert editors, North Holland, New York, 273-284 (1985).
• [6] Nastac, L., Stefanescu, D.M., Prediction of grey-to-white transition in cast iron by solidification modelling. AFS Transaction, vol. 103, 329-337 (1995).
• [7] Nastac, L., Stefanescu, D.M., Prediction of grey-to-white transition in cast iron by solidification modelling. AFS Transaction, vol. 103, 329-337 (1995).
• [8] Rys J : Stereology of materials, Fotobit, Cracov, 1995.
• [9] Osher J, Lorz.U, Quantitative Gefuengenanalysie, DVG Leipzig-Stuttgard, 1994.
• [10] Fras E,, Górny M., Lopez H, The Transition from Gray to White Iron during Solidification, Metallurgical Transactions and Materials, vol.36A, 176-196, 3075-3082 (2005).