Detail publikace
Numerický model heterogenity tvárné litiny
STRÁNSKÝ, K. KAVIČKA, F. SEKANINA, B. ŠTĚTINA, J. DOBROVSKÁ, J.
Český název
Numerický model heterogenity tvárné litiny
Anglický název
Numerical model of heterogeneity of the ductile cast-iron
Typ
článek v časopise - ostatní, Jost
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.
Český abstrakt
Originální třírozměrný model tuhnutí je použit pro popis tuhnutí a chlazení masivního odlitku z tvárné litiny o rozměrech 500x1000x500 mm. Vypočtené průběhy teplotních polí byly ověřeny měřením ve vybraných bodech odlitku. Byly metalograficky analyzovány odebrané vzorky s ohledem na heterogenitu chemického složení. Současně bya použitím modelu teplotního pole vypočtena místní doba tuhnutí. Ukazuje se, že předložené základní charakteristiky struktury jsou přímo úměrné logaritmu místní doby tuhnutí. Získaný model tuhnutí může být použit jako první aproximace pro stanovení struktury masivního odlitku z tvárné litiny.
Anglický 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 česky
tvárná litina, doba tuhnutí, segregace, strukturální charakteristika, modelování
Klíčová slova anglicky
ductile cast-iron, solidification time, segregation, structural characteristic, modelling
Rok RIV
2009
Vydáno
20.10.2009
Nakladatel
IMŽ
Místo
Gliwice
ISSN
0137-9941
Časopis
Prace Instytutu Metalurgii Zelaza
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",
month="October",
pages="137--141",
publisher="IMŽ",
address="Gliwice",
issn="0137-9941"
}