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Abstract

The article presents results of pitting corrosion studies of selected silicon cast irons. The range of studies included low, medium and high

silicon cast iron. The amount of alloying addition (Si) in examined cast irons was between 5 to 25 %. Experimental melts of silicon cast

irons [1-3] were conducted in Department of Foundry of Silesian University of Technology in Gliwice and pitting corrosion resistance

tests were performed in Faculty of Biomedical Engineering in Department of Biomaterials and Medical Devices Engineering of Silesian

University of Technology in Zabrze. In tests of corrosion resistance the potentiostat VoltaLab PGP201 was used. Results obtained in those

research complement the knowledge about the corrosion resistance of iron alloys with carbon containing Si alloying addition above 17 %

[4-6]. Obtained results were supplemented with metallographic examinations using scanning electron microscopy. The analysis of

chemical composition for cast irons using Leco spectrometer was done and the content of alloying element (silicon) was also determined

using the gravimetric method in the laboratory of the Institute of Welding in Gliwice. The compounds of microstructure were identify by

X-ray diffraction.

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Authors and Affiliations

A. Kajzer
M. Stawarz
M. Dojka
W. Kajzer
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Abstract

In the research, relationships between matrix structure and hardness of high-quality Ni-Mn-Cu cast iron containing nodular graphite and nickel equivalent value were determined. Nickel equivalent values were dependent on chemical composition and differences between them resulted mostly from nickel concentration in individual alloys. Chemical compositions of the alloys were selected to obtain, in raw condition, austenitic and austenitic-martensitic cast iron. Next, stability of matrix of raw castings was determined by dilatometric tests. The results made it possible to determine influence of nickel equivalent on martensite transformation start and finish temperatures.
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Authors and Affiliations

D. Medyński
A. Janus
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Abstract

The paper presents results of tests carried out on ausferrite carbide matrix alloyed ductile cast iron. The ausferrite was obtained via addition of Cu and Mo alloying elements. This eliminated heat treatment from the alloy production cycle. The article presents results of tests of the quality of the obtained material. Emphasis was put on metallographic analysis using light and scanning microscopy. Works also included chemical composition tests and EDS analysis. Strength tests were executed in an accredited laboratory. It is possible to create a raw ausferrite carbide matrix without subjecting an alloy to heat treatment. However, it turned out that quality parameters of cast iron were insufficient. The obtained material hardness was 515 HB, while Rm strength and A5 ductility were very low. The low tensile strength of the analyzed alloy resulted from the presence of degenerate graphite secretion (of flake or vermicular shape) in the cast iron. The tests also demonstrated that the alloy was prone to shrinkage-related porosity, which further weakened the material. Alloys made of alloyed ductile iron of ausferrite matrix micro-structure are very attractive due to elimination of the heat treatment process. However, their production process and chemical composition must be optimized.
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Bibliography

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Authors and Affiliations

M. Stawarz
1
ORCID: ORCID
M. Lenert
1
K. Piasecki
1
ORCID: ORCID

  1. Department of Foundry Engineering, Silesian University of Technology, Towarowa 7 St., 44-100 Gliwice, Poland

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