Szczegóły publikacji

Opis bibliograficzny

Autorzy (4)

• AGHFraś Edward
• AGHWiencek Kurt
• AGHGórny Marcin
• López H. F.

Słowa kluczowe

Dane bibliometryczne

ID BaDAP	23211
Data dodania do BaDAP	2005-09-16
Tekst źródłowy	URL
DOI	10.1179/136404605225023009
Rok publikacji	2005
Typ publikacji	artykuł w czasopiśmie
Otwarty dostęp
Czasopismo/seria	International Journal of Cast Metals Research

Abstract

In this work, a model is proposed for heterogeneous nucleation on substrates (sites) whose size distribution can be described by Weibull statistics. It is found that the nuclei density N can be given in terms of the maximum undercooling Delta T-m by N=N-s exp[(-b/Delta T-m)F(1 + 1/n)(n)]; where n is a positive integer, N-S is the overall nucleation site density in the melt and b is the nucleation coefficient (b > 0) (Gamma denotes the gamma function). In the case when nucleation occurs on all the possible sites, the graphite nodule density N-V after solidification equals N. Consequently, measurements of N-V values were carried out on experimental nodular iron castings processed under various inoculation conditions. In addition, maximum undercooling Delta T-m was measured by thermal analysis and volumetric nodule count (nodule density). N-V, was estimated from area densities N-A on cast iron surface sections using stereology. The experimental results indicate that nucleation can be described by the proposed expression for n = 1 (i.e. N = N, exp[-b/Delta T-m]). Moreover, N-S and b values were experimentally determined. Finally, the proposed model suggests that the site size distribution is exponential in nature.

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