Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 4
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

In this study a group of selected transformation kinetics equations is applied to describe the isothermal ferritic transformation in austempered ductile iron (ADI). A series of dilatometric tests has been carried out on ADI at different temperatures. The obtained experimental data are utilized to determine the parameter values of the considered kinetic equations. It is found that the transformation kinetics models by Starink, Austin and Rickett are substantially more effective at describing the ferritic transformation in ADI than the much celebrated Johnson-Mehl-Avrami-Kolmogorov (JMAK) equation. Furthermore, it is demonstrated that evaluating the kinetic parameters using the least squares method instead of calculating them from vastly used formulas can significantly improve the accuracy of the JMAK model’s predictions.

Go to article

Authors and Affiliations

C. Suchocki
D. Myszka
K. Wasiluk
Download PDF Download RIS Download Bibtex

Abstract

The possibilities of producing ductile cast iron with the addition of 1 ÷ 3% of tungsten are presented. Tungsten from waste chips from mechanical processing was introduced into the liquid cast iron in the form of specially prepared cartridges. Correct dissolution of tungsten in the metal bath was found, and there were no casting defects in the alloy. The form of carbide precipitates in the microstructure of cast iron was determined and the influence of increasing tungsten content on the reduction of the number of graphite precipitates in the structure was determined. Impact tests show that this property degrades with increasing tungsten content as opposed to hardness which increases. It was found that the addition of tungsten from machining waste is a potential source of enrichment of cast iron with this element.
Go to article

Bibliography

[1] Volkov, A.N. (1975). Abrasive wear resistance of manganese cast iron with tungsten. Metal Science and Heat Treatment. 17, 412-414.
[2] Duarte, L.I., Lourenço, N., Santos, H., Santos, J. & Sá, C. Tungsten carbide powder inserts in ductile iron. Materials Science Forum. 455-456, 267-270.
[3] Kopyciński, D. (2009). Analysis of the structure of castings made from chromium white cast iron resistant to abrasive wear. Archives of Foundry Engineering. 9(4), 109-112.
[4] Podrzucki, Cz. (1991). Cast Iron. The Structure, Property, Application. T.1 and T.2, Kraków: Ed. ZG STOP. (in Polish).
[5] Fraś, E. (2003). Crystallization of metals. Warsaw: WNT. (in Polish).
[6] Dean, N.F., Mortensen, A. & Flemings, M.C. (1994). Microsegregation in cellular solidification. Metallurgical And Materials Transactions A-Physical Metallurgy And Materials Science. A 25A, 2295-2301. DOI: 10.1007/BF 02652329.
[7] Wołczyński, W., Guzik, E., Kania, B. & Wajda, W. (2010). Structures field in the solidifying cast iron roll. Archives of Foundry Engineering. 10(spec.1), 41-46.
[8] Studnicki, A. (2008). Effect of boron carbide on primary crystallization of chromium cast iron. Archives of Foundry Engineering. 8(1), 173-176.
[9] Myszka, D. (2021). Cast Iron–Based Alloys. In: Rana, R. (eds) High-Performance Ferrous Alloys. Springer, Cham., 153-210.
Go to article

Authors and Affiliations

D. Myszka
1
Justyna Kasińska
ORCID: ORCID
A. Penkul
1

  1. Department of Metal Forming and Foundry, Warsaw University of Technology, Narbutta 85, Warsaw, Poland
Download PDF Download RIS Download Bibtex

Abstract

Image analysis allows to acquire a number of valuable quantitative informations on the observed structure and make appropriate conclusions. So far, a large part of analyzed images came only from light microscopes, where it was a possibility of accurately distinguish the different phases on the plane. However, the problem happened in the case of the observation of images obtained by scanning electron microscopy. In this case, the presence of various shades of gray, and the spaciousness of the image attained. To perform the analysis the matrix images of the ausferritic ductile iron were used. Full analysis was carried out using the computer program MicroMeter 1.03. Results obtained in the analysis were related directly to the results from X-ray diffraction. Obtained as a result of the analysis were related directly to the results from X-ray diffractometer. The following technique has weaknesses, including the misinterpretation by the operator microscope or program. After all, it was possible to obtain similar results to the result that has been obtained from X-ray diffractometer.
Go to article

Authors and Affiliations

W. Trzaskowski
P. Nawrocki
K. Łukasik
D. Myszka
Download PDF Download RIS Download Bibtex

Abstract

The article describes the impact of germanium on the course of surface phenomena in casting alloys of silver used in gold smithing. The aim of this works is to describe the assessment of resulting alloys, comparing the area of raw castings and the impact of the addition content of the alloy on the hardness of the samples. The evaluation also was subject to corrosion resistance of giving a comparison of their use in relations to traditional silver alloys.
Go to article

Authors and Affiliations

M. Jesiotr
W. Trzaskowski
D. Trochimiak
P. Nawrocki
K. Łukasik
D. Myszka

This page uses 'cookies'. Learn more