Metallurgy and Foundry Engineering
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ISSN 1230-2325
e-ISSN: 2300-8377
Issue Date
2012
Volume
Vol. 38
Number
No. 2
Description
Journal Volume
Metallurgy and Foundry Engineering
Vol. 38 (2012)
Projects
Pages
Articles
Analysis of the effect of $CO_2$ blow on the oxidation of iron alloys' elements
(2012) Karbowniczek, Mirosław; Michaliszyn, Andrzej; Wcisło, Zygmunt; Ślęzak, Wojciech
Reduction of CO$_2$ emission can be achieved in mctallurgical processes. The unit, which has high potential for reducing CO$_2$ emission is a blast fumace, where after the separation of CO$_2$ from the top gas, this gas can be recycled. Gained CO$_2$ can be used in steelmaking processes. The paper shows the results of CO$_2$ blowing into molten metal in order to oxidize carbon and silicon.
Effect of unconventional methods of cutting on microstructure, topography and microhardness changes in steel
(2012) Leszczyńska-Madej, Beata Katarzyna; Richert, Maria Wiesława; Sak, Teresa
The carbon steel for ąuenching and tempering has been cut with two different techniques, plasma arc and laser. The influence of these two unconventional methods of cutting on the changes of microstructure and properties has been studied in this paper. The structure changes after cutting were investigated by means of both light and scanning electron microscopy, additionally microhardness in the heat affected zone was measured. The performed investigations show that both methods of cutting have a strong influence on the structure and properties of investigated steels. Characteristic structure of cut area was a bainitic structure. The amount of bainite structure decreased with increased distance from the edge of the cutting sample. The plasma arc cutting influences the structure changes morę than laser beam. The bainitic structure after this method of cutting was observed to a depth of near 130 micrometers (laser), whereas after plasma arc - average 400 micrometers. Measured microhardness at the edge after cutting by both methods was about 28OHvO.l what makes up 130% increase comparing to materiał beyond the heat affected zone.
The influence of construction method selection on the character of hardness curve of AISI 316Cu acid resistant steel
(2012) Rumiński, Maciej
The paper presents the experimental investigations of AISI 316Cu austenitic acid resistant steel, which aimed at the determination of the characteristic of this steel in a form of hardness curve, i.e. the relationship between hardness and effective strain. Three different methods were applied: the first one was based on uniaxial tension, the second one was based on frictionless compression of Rastegaev specimens, and the third one was based on multi-pass wire drawing process. As a result, three series of specimens were obtained, suitable metallographic specimens were prepared and hardness measurements were madę on each specimen's cross section. The results of measurements combined with the calculations of uniform strain performed for each specimen, madę it possible, with application of approximation by polynomial, to construct the functional relationship described by the eąuation of hardness curve of the steel under investigation. The determination of such type of materials characteristic allows to practically evaluate the state of strain and, if the flow curve is also known, the flow stress in a local scalę, by means of hardness measurements.
Some aspects of estimation accuracy of mean true interllamelar spacing
(2012) Czarski, Andrzej; Matusiewicz, Piotr
Lamellar microstructures are characterized by interlamellar spacings: random, apparent and true. The mean value of true interlamellar spacing can be estimated by measurements of apparent spacings, random spacings or by counting number of intersections the secant with plates. In this paper the statistical errors in true interlamellar spacing measurements has been determined and discussed using the example of pearlite in eutectoid steel. The accuracy of estimation of true interlamellar spacing using all the methods is comparable and sufficient.
Chemical analysis of refractory materials by SEM technique
(2012) Kuźnia, Monika; Rozmus-Górnikowska, Magdalena Monika; Szajding, Artur; Jerzak, Wojciech
In Polish industry, especially in the iron and steel industry, uses large amounts of refractory materials. Waste materials are disposed of through a common storage. For altemative methods of waste management of refractory materials, it is necessary to carry out several studies. One of the basie research include determine the chemical composition of refractory materials exposed to liąuid steel. This paper presents the results of microscopic examination of changes in the concentration of refractory elements in new and used.