Detail publikace
Numerical model of heterogeneity of the ductile cast-iron
STRÁNSKÝ, K. KAVIČKA, F. SEKANINA, B. ŠTĚTINA, J. DOBROVSKÁ, J.
Anglický název
Numerical model of heterogeneity of the ductile cast-iron
Typ
Článek recenzovaný mimo WoS a Scopus
Jazyk
en
Originální abstrakt
An original three-dimensional (3D) model of solidification is used to describe the process of solidification and cooling of massive 500x1000x500 mm ductile cast-iron castings. The castings are cast in sand moulds. The calculated mode of the kinetics of the temperature field of the casting is verified during casting with temperature measurements in selected points.The experimental samples – 15 mm in diameter and 12 mm high – are metallographically analysed and also in terms of heterogeneity of the chemical composition. Successively, the local solidification time (i.e. the time the specified position of the casting, remains within the temperature range between the liquidus and solidus) is also calculated using the 3D model. The following dependences are later determined according to the experimental and calculated data: the average size of the graphite spheroids rg, graphite cells Rb and the average distances among the particles of graphite Lg – always as a function of the local solidification time xi, yi, zi . Furthermore, it has been found out that the given basic characteristics of the structure of the cast iron rg, Rb and Lg are directly proportional to the logarithm of the local solidification time. The original spatial model of solidification can therefore be used in its first approximation for the assessment of the pouring structure of massive cast-iron castings.
Klíčová slova anglicky
ductile cast-iron, solidification time, segregation, structural characteristic, modelling
Vydáno
2009-10-20
Nakladatel
IMŽ
Místo
Gliwice
ISSN
0137-9941
Ročník
61
Číslo
5
Strany od–do
137–141
Počet stran
5
BIBTEX
@article{BUT48212,
author="Karel {Stránský} and František {Kavička} and Bohumil {Sekanina} and Josef {Štětina} and Jana {Dobrovská}",
title="Numerical model of heterogeneity of the ductile cast-iron",
journal="Prace Instytutu Metalurgii Zelaza",
year="2009",
volume="61",
number="5",
pages="137--141",
issn="0137-9941"
}