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STRÁNSKÝ, K. KAVIČKA, F. SEKANINA, B. ŠTĚTINA, J. DOBROVSKÁ, J.
Original Title
Numerical model of heterogeneity of the ductile cast-iron
Type
journal article - other
Language
English
Original Abstract
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.
Keywords
ductile cast-iron, solidification time, segregation, structural characteristic, modelling
Authors
STRÁNSKÝ, K.; KAVIČKA, F.; SEKANINA, B.; ŠTĚTINA, J.; DOBROVSKÁ, J.
RIV year
2009
Released
20. 10. 2009
Publisher
IMŽ
Location
Gliwice
ISBN
0137-9941
Periodical
Prace Instytutu Metalurgii Zelaza
Year of study
61
Number
5
State
Republic of Poland
Pages from
137
Pages to
141
Pages count
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" }