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Abstract

Quantitative evaluation of the microstructure obtained in a product is nowadays commonly required both in R&D activities and during routine quality control of materials and components.
This paper presents an assessment of the quality of ductile cast iron, based on investigations of the effect of chemical composition on the distribution of ductile graphite precipitates in low-alloy cast iron EN-GJS-500-7. The size of graphite precipitates was expressed in terms of equivalent cross-sectional diameter, which made it possible to describe the distribution of graphite precipitates with a function simulating the log-normal distribution of graphite. The resulting U, W and Z parameters were statistically analysed, including the effect of chemical composition on graphite distribution. In the studied cast iron, the components that increase the U parameter are silicon, manganese and phosphorus, thus favourably affecting the total graphite number. In contrast, the constituents that decrease the U parameter are carbon, chromium and aluminium.
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Bibliography

[1] Cybo, J., Jura, S. (1995). Functional description of isometric structures in quantitative metallography. Gliwice: Silesian University of Technology Publishing House. (in Polish)
[2] Alp, T., Wazzan, A.A. & Yilmaz, F. (2005), Microstructure-property relationships in cast irons. The Arabian Journal for Science and Engineering. 30(2B), 163-175.
[3] Podrzucki, C. (1999). Publishing House. Cracow: STOP. (in Polish).
[4] Angus, H.T. (1978). Cast Iron: Physical and Engineering Properties. London-Boston: Edit Butterworth a. Co.
[5] Jura, S. & Jura, Z. (2001). The influence of the chemical composition and degree of spheroidization of graphite on the mechanical properties mechanical properties of cast iron. Archives of Foundry. 1(1), (2/2), 1-8. ISSN 1642-5308
[6] Ripplinger, C., Gastens, M., Zimmermann, J., Bjӧrn, P., Broeckmann, C., Schrӧder, K-U. & Bührig-Polaczek, A. (2021). Potential of metallurgical gradients in the design of components structural components made of ductile iron. Materials, 14(9), 2411. DOI: 10.3390/ma14092411
[7] Menk, W., Tunzini, S., Rieck, T., Honsel, C. & Weiss, K. (2010). Material development of ductile iron, simulation and production technology for local reinforcement of castings. Key Engineering Materials. 457, 343-348. https://doi.org/10.4028/www.scientific.net/KEM.457.343
[8] Stefanescu, D.M. & Suárez, R. (2020). 90 years of thermal analysis as a control tool in the melting of cast iron. China Foundy. 17(2), 69-84. https://doi.org/10.1007/s41230-020-0039-x
[9] Friess, J., Bührig-Polaczek, A., Sonntag, U. & Steller, I. (2020). From individual graphite assignment to an improved digital image analysis of ductle iron. International Journal of Metalcasting. 14, 1090-1104. https://doi.org/10.1007/s40962-020-00416-3
[10] Bartocha, D. (2006). The structure of EN-GJS-500-7 cast iron depending on the feedstock materials. Archives of Foundry. 6(22), 27-32. ISSN 1642-5308
[11] Materials of Śrem Cast Iron Foundry based in Śrem. Retrieved September 12, 2021, from http://www.proservicetech.it/itacax-thermal-analysis-final-iron-quality-control/
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Authors and Affiliations

H. Pacha-Gołębiowska
1
ORCID: ORCID

  1. Akademia Nauk Stosowanych im. Jana Amosa Komeńskiego w Lesznie, ul. Mickiewicza 5, 64-100 Leszno, Poland
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Abstract

The results of research on stereological parameters of carbides in modified hypoeutectic chromium cast iron were shown in the paper. The

effect of distance the casting heat centre of casting to the carbide phase morphology was examined. The samples for metallographic

examination were taken from various locations of the model casting prepared in a special tester. This model casting was designed to

simulate the solidification of heavy castings. Using the proposed methodology the relation of the distance from the model mould and the

size, perimeter, length, width and the shape factor of carbides was examined. During the analysis, the values of stereological parameters of

carbides changed on various sections of the model casting.

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Authors and Affiliations

M. Gromczyk
A. Studnicki
M. Kondracki
J. Szajnar

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