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Abstrakty
In this work an analytical solution is used to explain mechanism of carbon influence on the transition from graphite to cementite eutectic in cast iron. It is found that this transition can be related to (1) the nucleation potential of graphite (characterized directly by the cell count, N and indirectly by nucleation coefficients Ns and b) (2) the growth rate coefficient of graphite eutectic cell, [mi] (3) the temperature range, [delta]Tsc = Ts - Tc (where Ts and Tc is the equilibrium temperature of the graphite eutectic and formation temperature of the cementite eutectic respectively) and (4) the liquid volume fraction, fl after solidification of the pre-eutectic austenite. Method of estimation of Ns b and [mi] values was presented. It has been shown that the main impact of carbon on the transition from graphite to cementite eutectic consist in increasing the eutectic cell count and growth rate of graphite eutectic cell. Analytical equations were derived to describe the absolute, CT relative chilling tendency, CTr and chill, w of cast iron.
Czasopismo
Rocznik
Tom
Strony
51--56
Opis fizyczny
Bibliogr. 11 poz., rys., tab., wykr.
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., Svensson 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] Fraś E., Wiencek K., Górny M., Lopez H.: Graphite nodule and eutectic cell count in cast iron; Theoretical model based on Weibull statistics and experimental verification, Metallurgical and Material Transctions A, vol. 38A, 385-395, (2007).
- [7] Jackson K.A., Hunt J.D.: Lamellar and rod eutectic growth, Transactions of the Metallurgical Society of AIME, vol. 236, 1129-1142, (1966).
- [8] Rys J.: Stereology of materials, Fotobit, Cracov, (1995).
- [9] Osher J., Lorz.U.: Quantitative Gefuengenanalysie, DVG Leipzig-Stuttgard, (1994).
- [10] Fraś E., Górny M., Lopez H.: The Transition from Gray to White Iron during Solidification, Metallurgical Transactions and Materials, Part I Theoretical background, vol. 36A, 3075-3082, (2005).
- [11] Fraś E., Górny M., Lopez H.: The Transition from Gray to White Iron during Solidification; Part II Experimental verification, Metallurgical Transactions and Materials, vol. 36A, 3083-3092, (2005).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-ed268a50-ae05-4a48-a016-f1fa74b6554a