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1
Content available The Use of the XGBoost and Kriging Methods in the Prediction of the Microstructure of CGI Cast Iron
Sztangret Łukasz, Olejarczyk-Wożeńska Izabela, Regulski Krzysztof, Gumienny Grzegorz, Mrzygłód Barbara
Archives of Foundry Engineering
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2023
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Vol. 23, iss. 4
22--33
EN
Compacted Graphite Iron (CGI) is a unique casting material characterized by its graphite form and extensive matrix contact surface. This type of cast iron has a tendency towards direct ferritization and possesses a complex set of intriguing properties. The use of data mining methods in modern foundry material development facilitates the achievement of improved product quality parameters. When designing a new product, it is always necessary to have a comprehensive understanding of the influence of alloying elements on the microstructure and consequently on the properties of the analyzed material. Empirical studies allow for a qualitative assessment of the above-mentioned relationships, but it is the use of intelligent computational techniques that allows for the construction of an approximate model of the microstructure and, consequently, precise predictions. The formulated prognostic model supports technological decisions during the casting design phase and is considered as the first step in the selection of the appropriate material type.
2
Content available remote Predicting the microstructure of compacted graphite iron using a fuzzy knowledge‑based system
Gumienny Grzegorz, Macioł Andrzej, Macioł Piotr
Archives of Civil and Mechanical Engineering
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2023
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Vol. 23, no. 2
art. no. e87, 2023
EN
One of the important engineering materials is compacted graphite iron (CGI). Obtaining an expected microstructure leading to desired material properties is relatively difficult. In this paper, we present an approach to predicting the microstructure with a fuzzy knowledge-based system. On the basis of the results of statistical analysis and expert knowledge, an original taxonomy of CGI casts was formulated. The procedure of data acquisition, specimen preparation, analysis procedure and microstructures obtained are presented. Methods for expert experience-supported knowledge extraction from experimental data, as well as methods for formalizing knowledge as fuzzy rules, are introduced. The proposed rulesets, the reasoning process, and exemplary results are provided. The verification results showed that, using our approach, it is possible to effectively predict the microstructure and properties of CGI casts even in the absence of sufficient data to use data-driven knowledge acquisition. On the basis of the results obtained, examples of possible applications of the developed approach are presented.
3
Content available Compacted Graphite Iron with the Addition of Tin
Gumienny G., Kurowska B., Fabian P.
Archives of Foundry Engineering
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2020
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Vol. 20, iss. 3
15--20
EN
The paper presents the effect of tin on the crystallization process, microstructure and hardness of cast iron with compacted (vermicular) graphite. The compacted graphite was obtained with the use of magnesium treatment process (Inmold technology). The lack of significant effect of tin on the temperature of the eutectic transformation has been demonstrated. On the other hand, a significant decrease in the eutectoid transformation temperature with increasing tin concentration has been shown. It was demonstrated that tin narrows the temperature range of the austenite transformation. The effect of tin on the microstructure of cast iron with compacted graphite considering casting wall thickness has been investigated and described. The carbide-forming effect of tin in thin-walled (3 mm) castings has been demonstrated. The nomograms describing the microstructure of compacted graphite iron versus tin concentration have been developed. The effect of tin on the hardness of cast iron was given.
4
Content available Approximation of Ausferrite Content in the Compacted Graphite Iron with the Use of Combined Techniques of Data Mining
Regulski K., Wilk-Kołodziejczyk D., Kacprzyk B., Gumienny G., Rojek G., Mrzygłód B.
Archives of Foundry Engineering
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2017
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Vol. 17, iss. 3
117--122
EN
This article presents the methodology for exploratory analysis of data from microstructural studies of compacted graphite iron to gain knowledge about the factors favouring the formation of ausferrite. The studies led to the development of rules to evaluate the content of ausferrite based on the chemical composition. Data mining methods have been used to generate regression models such as boosted trees, random forest, and piecewise regression models. The development of a stepwise regression modelling process on the iteratively limited sets enabled, on the one hand, the improvement of forecasting precision and, on the other, acquisition of deeper knowledge about the ausferrite formation. Repeated examination of the significance of the effect of various factors in different regression models has allowed identification of the most important variables influencing the ausferrite content in different ranges of the parameters variability.
5
Content available remote Analysis of fracture mechanism in austenitic ductile iron with 30% Ni after impact test
Putyra P., Tabor A., Zarębski K.
Archives of Foundry Engineering
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2008
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Vol. 8, iss. 4
193-198
EN
The study presents the results of impact tests carried out on austenitic ductile iron with 30% Ni. The examined material was subjected to dynamic loads within a wide range of temperatures from (-196°C) to (+400°C). The fractures were examined under a JEOL JSM 6460LV scanning electron microscope. Additionally, microstructural examinations were carried out and chemical analysis in microregions was done by EDS.
6
Content available remote Vplyv zvyšovania ocel'oveho šrotu vo vsadzke na mechanicke vlestnosti a štruktúru liatiny
Bobok L., Futaš P., Vaskova I.
Archiwum Odlewnictwa
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2004
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R. 4, nr 11/1
59--63
SK
Liatina s gulockovym grafitom (LGG) si nasla od polovice 20. storocia svoje miesto na ukor liatiny s lupienkovym grafitom (LLG) a takmer celkom vytlacila temperovanu liatinu. Nast vyroby LGG v priemyselne vyspelych statoch Europy [...]
EN
The iron casting in the long term keep up primacy the cast stock to base of iron. The cast stock from spheroidal graphite cast iron have technical and technological properties. Economic development in at the manufacturing department force the entrepreneur and manufacturer to rationalization producing at therely decreasing manufacturing costs. In term of manufacturing costs the world-wide trend take off on the way raising share steel scrap on the production of technology rises. The intention of study was finding out the effect various changing composition batch, especially steel scrap to consequential properties of spheroidal graphite cast iron.
7
Řetízkový grafit v litině s kuličkovým grafitem (LKG)
Šustek P., Stránský K., Rusin K.
Zeszyty Naukowe. Mechanika / Politechnika Opolska
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1998
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z. 57
135-138
8
Modelování růstu grafitu v litiniě s kuličkovým grafitem
Zemčik L.
Zeszyty Naukowe. Mechanika / Politechnika Opolska
|
1998
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z. 57
153-157
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