Metallurgy and Foundry Engineering
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ISSN 1230-2325
e-ISSN: 2300-8377
Issue Date
2013
Volume
Vol. 39
Number
No. 2
Description
Journal Volume
Metallurgy and Foundry Engineering
Vol. 39 (2013)
Projects
Pages
Articles
Estimation of the cooling rate in 3 mm suction-cast rods based on the microstructural features
(2013) Kozieł, Tomasz; Matusiewicz, Piotr; Kopyściański, Mateusz; Zielińska-Lipiec, Anna
One of the factors influencing possibility of bulk metallic glass formation is cooling rate attainable in the casting process. The evaluation of the cooling rate of the suction-cast 3 mm rods is presented based on the measurements of the cellular spacing in the Fe-25Ni and lamellar spacing in the Cu-33Al alloys. The estimated cooling rates are higher close to the rod surface (2952-3817 $K\cdot s^{-1}$) than in the rod axis (228-328 $K\cdot s^{-1}$), which indicates the dominant radial heat flow. In contrast, for the Al-33Cu alloy higher cooling rates were evaluated in the rod axis than close to the surface due to the concave perturbation of the solidification front during eutectic transformation. Based on the results obtained for the Fe-25Ni alloy, it is concluded, that the cooling rate for the suction-cast 3 mm rod is not lower than 228 $K\cdot s^{-1}$.
Aluminum foams gluing
(2013) Sajek, Adam Eugeniusz
The paper presents an example of design solution of aluminum foam glue joint using two-component epoxy glue. The joint principles for distribution forces and stresses in the tensile sample were formulated. Recommendations for surface preparation of foam and gluing procedure aimed at control the porosity of the foam and glued surface roughness were established. As a result of strength tests defined joint destruction mechanism was proposed. It was suggested that optimized joint design improving its properties.
Artefacts from Krakow-Nowa Huta as an illustration of selected issues of research into prehistoric and mediaeval casting
(2013) Garbacz-Klempka, Aldona; Rzadkosz, Stanisław; Górski, Jacek
An attempt to examine the earliest traces of non-ferrous metal metallurgy and casting in present-day Krakow has been made. The preparatory investigation has centred around a group of finds coming from a small section of the eastern part of the city, the area of Nowa Huta. The paper gives an overall view of objects ranging from the first copper artefacts from the territory of Poland in the 4th millennium BC through Lusatian bronzes and Celtic products to modern slag from Jan Thurzo’s copper smelter. The analysis, involving diverse copper or copper alloy artefacts, ornaments and tools – both imports and local products – has been aimed at preliminary identification of Krakow’s earliest metal artefacts in terms of their materials and methods of production, and at preparing the ground for further study. This multifaceted research is intended to result in a comparison of materials and techniques used in metallurgy and casting during the timespan of 5000 years.
Archaeological remains of the copper metallurgy in Lower Silesia
(2013) Garbacz-Klempka, Aldona; Rzadkosz, Stanisław; Stolarczyk, Tomasz; Kozana, Janusz; Piękoś, Marcin
Many traces of copper metallurgy, such as slag and other copper melts, can be found in the area of Lower Silesia. The tested material mainly consists of copper slag with different content of copper melts, being a semi product. The copper metallurgy remains, discovered during the research, undergo specialistic analyses, which will help better characterise the findings as well as contribute to documenting metallurgical processes in the historical bloomeries in Lower Silesia, and moreover to prepare further research in this field. The material coming from the area of Miedzianka, being the oldest and the longest working exploitation centre of copper ores and pollymetalic ores, is of special significance for the research. Mining activity in the area of Miedzianka took place as early as the beginning of the 14th century, the first record from 1311 (Cuprifodina in montubus) is the oldest information concerning copper mining in Poland.
The influence of selected alloying elements on the microstructure, selected mechanical and technological properties of brasses
(2013) Kozana, Janusz; Rzadkosz, Stanisław; Garbacz-Klempka, Aldona; Piękoś, Marcin; Cieślak, Witold
The research aimed at assessing the influence of alloying elements, such as Al, Si, Ni, Pb and Bi on the chosen alloys of Cu-Zn. Microstructures were examined with the useof optical and scanning microscopy with X-ray microanalysis. The properties of the received alloys were determined with regard to changes in the mechanical parameters, namely $R_{m}$, $A_{5}$, HB, also, machinability changes were assessed as well as proclivity to hot fracturing of Cu-Zn alloys with additives of lead and bismuth. The results indicate the possibility of obtaining very high mechanical properties: $R_{m}$ up to 700 MPa, hardness within the range of 130-180 HB and $A_{5}$ from 3 to 30%. Also, in the case of the researched alloys, the machining and hot fracturing results look promising.