Szczegóły publikacji

Opis bibliograficzny

Autorzy (4)

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

Dane bibliometryczne

ID BaDAP	52472
Data dodania do BaDAP	2010-07-13
DOI	10.1007/s11661-006-9045-x
Rok publikacji	2007
Typ publikacji	artykuł w czasopiśmie
Otwarty dostęp
Czasopismo/seria	Metallurgical and Materials Transactions, A, Physical Metallurgy and Materials Science

Abstract

In this work, a model is proposed for heterogeneous nucleation on substrates whose size distribution can be described by the Weibull statistics. It is found that the nuclei density, N-nuc, can be given in terms of the maximum undercooling, Delta T-m, by N-nuc = N-s exp (-b/Delta T-m), where N-s is the density of nucleation sites in the melt and b is the nucleation coefficient (b > 0). When nucleation occurs on all possible substrates, the graphite nodule density, N-V,N-n, or eutectic cell density, N-V, after solidification equals N-s. In this work, measurements of N-V,N-n and N-V values were carried out on experimental nodular and flake graphite iron castings processed under various inoculation conditions. The volumetric nodule N-v,N-n or graphite eutectic cell N-V count was estimated from the area nodule count, N-A,N-n, or eutectic cell count, N-A, on polished cast iron surface sections by stereological means. In addition, maximum undercoolings, Delta T-m, were measured using thermal analysis. The experimental outcome indicates that the N-V,N-n or N-V count can be properly described by the proposed expression N-V,N-n = N-V = N-s exp (-b/Delta T-m). Moreover, the N-s and b values were experimentally determined. In particular, the proposed model suggests that the size distribution of nucleation sites is exponential in nature.

Publikacje, które mogą Cię zainteresować