Metallurgy and Foundry Engineering
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ISSN 1230-2325
e-ISSN: 2300-8377
Issue Date
2017
Volume
Vol. 43
Number
No. 2
Description
Journal Volume
Metallurgy and Foundry Engineering
Vol. 43 (2017)
Projects
Pages
Articles
Influence of immersion depth of ladle shroud in liquid steel on range of transition zone for one-strand tundish during continuous casting of steel
(Wydawnictwa AGH, 2017) Bartosiewicz, Michał; Cwudziński, Adam
This article presents the results of a computer simulation of the flow of liquid steel through a onestrand tundish. In this paper, we examine four immersion depths of a ladle shroud in liquid steel. The simulation was performed for a sequence of slab castings. The effect of the calculations were residence time distribution curves (RTD), type (F). Based on the distribution curves, the range of the transition zone for the different variants of the immersion depth of a ladle shroud were estimated. Based on the results of numerical calculations, it was found that increasing the immersion depth of the ladle shroud in liquid steel influences the range of the transition zone. For numerical simulations of the flow of liquid steel, the Ansys-Fluent program was used.
Heterogeneity of glass components in slag after nickel acquisition process from Kola Peninsula (Russia)
(Wydawnictwa AGH, 2017) Kasikov, Aleksandr Georgievič; Huber, Miłosz A.; Majorova, Ekaterina; Rakitina, Elena Ûrʹevna; Grišin, Nikolaj Nikitovič; Neradovskij, Ûrij Nikolaevič
The problem of the disposal of metallurgical slags in the copper-nickel industry also remains open in the Kola Peninsula area, where this kind of exploitation and processing of sulphide Cu-Ni deposits is conducted. The urgent need is to reuse the waste slag heaps through the effective manner of their use based on our available technologies. The slag obtained after processing sulphide copper-nickel ores in the Kola Peninsula contains about 4 wt.% of the ore. The chemical and mineral composition of the slag plays a key role when considering the possibility of its re-use in the context of environmental nuisance. The line of processing Cu-Ni sulfide deposits from the slag proposed by the authors is based on the ability to change the slag phase composition by its oxidation and reduction processes for the enrichment of ore mineralization for reuse.
Copper matrix composites reinforced with titanium nitride particles synthesized by mechanical alloying and spark plasma sintering
(Wydawnictwa AGH, 2017) Franczak, Aleksandra; Karwan-Baczewska, Joanna
Copper matrix composites containing ceramic particles such as carbides, borides, or nitrides have attracted much attention over the last few years. The increased interest in such materials has mainly been created by their high electrical and thermal conductivity, good mechanical and tribological properties, and microstructural stability. Among other nitrides, the titanium nitride seems to be considered as an attractive reinforcement due to its high hardness, excellent electrical conductivity, and stability at high temperatures. Moreover, its good corrosion resistance proves the uniqueness of the TiN particles above any other nitrides. In this work, Cu-10 wt.% TiN composite powders were produced by mechanical alloying and sintered by the spark plasma sintering (SPS) technique under different temperatures. The morphology and powder particle size after mechanical synthesis were inspected by a scanning electron microscopy (SEM) for all of the powder samples, chemical composition analyses (EDS) were also performed. The hydrostatic method was used to measure the density of the composite samples to analyze the influence of milling time on the process of consolidation in the composite powders.
Elastic properties and structural observations of Distaloy SA powder sintered with boron and carbon
(Wydawnictwa AGH, 2017) Perek-Nowak, Małgorzata; Karwan-Baczewska, Joanna
One of the methods aimed at increasing the density in PM parts is the process of activated sintering performed by adding boron as elementary boron powder, for example. Under this researchwork novel, PM materials were obtained based on prealloyed and diffusion bonded powder (type: Distaloy SA) with the following chemical composition: Fe-1.75%Ni-1.5%Cu-0.5%Mo, with the addition of 0.55 wt.% carbon and boron (0.2, 0.4 and 0.6 wt.%). Distaloy SA samples alloyed with carbon and boron were manufactured by mixing the powders in a Turbula mixer, then compacting the mixture in a hydraulic press under a pressure of 600 MPa and sintered in a tube furnace at 1473 K for 60 minutes in a hydrogen atmosphere. The densification process of Distaloy SA parts with boron and carbon depends on the sintering mechanism. In order to evaluate the sintering mechanism of the PM samples, structural investigations using SEM/EDS were performed. During sintering of these materials at 1473 K, a liquid phase is generated as a result of the reaction occurring between the alloy matrix and the complex of carbo-borides, which leads to a considerable degree of consolidation. The elastic properties of the sintered samples (such as Young's modulus and the damping coefficient) were measured in a tensile test with a Förster elastometer.
Possibility of Al-Cu composite manufacturing from fine metal fractions by recycling process
(Wydawnictwa AGH, 2017) Wzorek, Łukasz; Wędrychowicz, Mateusz; Wiewióra, Marcel; Noga, Piotr; Skrzekut, Tomasz; Wzorek, Agata; Łyp-Wrońska, Katarzyna
Plastic consolidation of highly fragmented materials is a cost-effective way to recover aluminum alloys. In this process, metal in the form of chips, powders, or ribbons omits the melting step that is typical for conventional scrap recycling, by that, it significantly reduces both energy expenses and material losses. By reducing the number of operations, the cost of labor and expenditures on environmental protection can be decreased. In addition, the solid bonding of metals in highly dispersed forms allows us to create heterogeneous structures that could be difficult to obtain in traditional processes. In the present study, the influence of the addition of Cu powder (99.7 wt.%) on the bonding quality of aluminum powder (99.7 wt.%) during hot extrusion is being examined. The examined materials contained aluminum powder with the addition of 5 wt.% of Cu powder. The mixture of these powders were cold compacted to produce an 80-mm-long charge for the extrusion process. Plastic consolidation was conducted at three different temperatures: 300°, 350°, and 400°C. As a result, rods 8 mm in diameter were obtained. Mechanical tests combined with microstructure observations and electrical conductivity tests were performed for the as-extruded materials.