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Number of results: 18
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Abstract

The article presents tests results of metalforming of magnesium alloy AZ61. Materials for tests were ingots sized  40×90 mm from magnesium alloy marked with symbol AZ61. Before the shaping process the ingots underwent heat treatment. As a result of conduction of the deformation processes there were rods achieved with diameter of 8 mm. There were axisymmetrical compression tests conducted on the samples taken from rods in temperature range from RT to 350ºC in order to determine the plasticity and formability of the alloy AZ61. Static tensile test was conducted in room temperature (RT), in 300ºC and in 350ºC. With the use of light and electron microscopy techniques the changes which occurred in the microstructure of AZ61alloy in initial condition and after plastic deformation (classic extrusion, KoBo method extrusion) were described. The deformation of alloy AZ61 using the KoBo method contributes to an increase in strength and plastic properties. The effect of superplastic flow was found at a temperature of 350ºC, where a 300% increase in plastic properties – elongation value was obtained. The analysis of the microstructure showed a significant grain size reduction in the microstructure of alloy AZ61 after deformation by the KoBo method and after an axisymmetric compression test, where grains of an average diameter of d = 13 µm were obtained.

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Authors and Affiliations

I. Bednarczyk
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Abstract

The article presents results of tests performed at the AGH-University of Science and Technology in Cracow on strength of single-coil inductors used as tools in electrodynamic machining of pipes. The character of volumetric Lorentz forces acting on coils of compressing and expanding inductors was discussed, and numerically determined distributions of stresses and displacements created in coils under the impact of these forces were presented. The problems presented are relevant when designing durable inductors intended for industrial applications.

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Authors and Affiliations

Józef Bednarczyk
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Abstract

The article deals with the contemporary translation of Tadeusz Różewicz’s poems into Russian. Regardless of the fact that some of his poetry had already been translated and published, new times and new readers need new translations. The considerations presented in the article refer precisely to them. Taken into account were primarily the translations of a generation of contemporary translators for an international competition on the translation of Różewicz’s poems, announced in 2013 by the foundation ‘For your freedom and ours’. The translations of three poems by the Polish poet have been considered: Words, In the light of flickering lamps and Such is the master, works frequently chosen by the winners of the said competition. In particular the analysis regards the saturation of the poems with cultural realities and inter-textual elements. Therefore, comments and some translators’ notes accompanying the translations were taken into account, ones defining their approach to the translation and the translated text itself. The considerations confirmed the need to activate the cognitive function of translation in modern translations – the purpose of the mentioned comments – but also to pay attention to the problems of translating free verse into Russian.

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Authors and Affiliations

Anna Bednarczyk
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Abstract

This paper presents the results of a study to determine the influence of casting parameters (cooling rate in the casting mould, casting temperature) on the primary structure of Mg-4%Li-1%Ca alloy ingots. The macro- and microstructure analysis of the Mg-4%Li-1%Ca alloy was performed using light and electron microscopy techniques. Microhardness measurements were made for the Mg-4%Li-1%Ca alloy and phase identification in the Mg-4%Li-1%Ca alloy was made using X-ray phase analysis.
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Bibliography

[1] Białobrzeski, A.& Saja, K. (2011). Experimental stand for melting and casting of ultralight Mg-Li alloys. Archives of Foundry Engineering. 11(3), 17-20.
[2] Bednarczyk, I., Kuc, D. & Mikuszewski, T.(2016). Microstructure and properties of Mg-Li-Re magnesium alloys.Hutnik-WH, 83(8), 321-323. (in Polish).
[3] Bin J. Heng-mei, Y. Rui-hong, L. & Liang, G. (2010). Grain refinement and plastic formability of Mg-14Li-1Al alloy.Transactions of Nonferrous Metals Society of China. 1, 503-507. DOI: 10.1016/s1003-6326(10)60527-4.
[4] Liu, X., Zhan, H., Gu, S., Qu, Z., Wu, R. & Zhang, M. (2011).Superplasticity in a two-phase Mg– 8Li–2Zn alloy processed by two-pass extrusion. Materials Science and Engineering A. 528(19-20), 6157-6162. https://doi.org/10.1016/j.msea.2011.04.073.
[5] Białobrzeski, A., Lech-Grega, M.& Żelechowski, J. (2010). Research on the structure of alloys based on magnesium and lithium with a two-phase α-β and single-phase ß structure.Prace Instytutu Odlewnictwa. L, 17-28. (in Polish).
[6] Zhou, Y., Bian, L., Chen, G. Wang, L. & Liang, W. (2015). Influence of Ca addition on microstructular evolution and mechanical properties of near-eutectic Mg-Li alloys by copper-mold suction casting. Journal of Alloys and Compounds. 664. 85-91. DOI:10.1016/j.jallcom.2015.12.198.
[7] Białobrzeski, A., Saja, K. & Hubner, K. (2007) Ultralightmagnesium-lithiumalloys. Archives of Foundry Engineering. 7(3), 11-16. ISSN(1897-3310).
[8] Jiang, B., Qiu, D., Zhang, M., Ding, P.& Gao, L. (2010). A new approach to grain refinement of an Mg-Li-Al cast alloy. Journal of Alloys and Compounds. 10(1-2), 96-98. DOI:10.1016/j.jallcom.2009.11.066.
[9] Grobner, J., Schmid-Fetzer, R., Pisch, A., Colinet, C., Pavlyuk, V.V., Dmytriv, G.S., Kevorkov, D.G. & Bodak, O.I. (2002). Phase equilibria, calorimetric study and thermodynamic modeling of Mg-Li-Ca alloys. Thermochimica Acta. 389(1-2), 85-94. DOI:10.1016/S0040-6031(01)00842-5.
[10] Song, G.S. &Kral, M.V. (2005) Characterization of cast Mg-Li-Ca alloys. Materials Characterization. (54)4-5, 279-286. DOI: 10.1016/j.matchar.2004.12.001.
[11] Cui, L. Sun, L.R., Zheng, Y. &Li, S. (2018). In vitro degradation and biocompatibility of Mg-Li-Ca alloys – the influence of Li content. Science China Materials, 61(4), 607-618.
[12] Zeng, R.C. Qi, W.C. & Cui, H.Z. (2015). In vitro corrosion of as-extruded Mg-Ca alloys – the influence of Ca concentration. Corrosion Science. 96. 23-31. DOI:10.1016/j.corsci.2015.03.018.
[13] Chang, T., Wang, J., Chu, Ch., Lee, S (2006). Mechanical properties and microstructures of various Mg–Li alloys.Materials Letters.60(27), 3272-3276. DOI 10.1016/j.matlet.2006.03.052.
[14] Li, T., Wu, S.D. Li, S.X. &Li, P.J. (2007).Microstructure evolution of Mg–14% Li–1% Al. alloy during the process of equal channel angular pressing.Materials Science and Engineering A. 460-461, 499-503.DOI10.1016/j.msea.2007.01.108.
[15] Jiang, B., Qiu, D., Zhang, M., Ding, P., Gao, L. (2010). A new approach to grain refinement of an Mg-Li-Al cast alloy. Journal of Alloys and Compounds.492(1-2), 95-98. DOI: 10.1016/j.jallcom.2009.11.066.
[16] Cui, L., Sun, L., Zeng, R., Zheng, Y., Li, S. (2017). In vitro degradation and biocompatibility of, Mg-Li-Ca alloys – the influence of Li content. Science China Materials 7/08, 1-12, DOI: 10.1007/s40843-017-9071-y.
[17] Gierek, A., Mikuszewski, T. (1998). Shaping the primary structure of metals and alloys.Gliwice: Wydawnictwo Politechniki Śląskiej. (in Polish).
[18] Adamski, C., Piwowarczyk, T. (1999).Metallurgy and foundry of non-ferrous metals. Aluminum and magnesium alloys. Kraków: Skrypt AGH nr 1117.
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Authors and Affiliations

Iwona Bednarczyk
1
ORCID: ORCID

  1. Silesian University of Technology, Department of Materials Technology, 40-019 Katowice ul. Krasińskiego 8, Poland
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Abstract

The article presents the results of tests of plastic shaping of magnesium alloy Mg-Li. Magnesium alloy for an extrusion process was obtained with the method of vacuum smelting and casting into graphite moulds. The materials for tests were slabs cast from magnesium alloys with symbols: Mg-4%Li-1%Ca (LX41). Before the process of deformation the castings were subject to homogenization. Conventional extrusion tests were conducted in a complex state of deformation (KoBo method). An assessment was performed of the influence of the deformation process parameters on the structure and properties of the tested alloy. Results of mechanical tests were presented both for static compression test in room temperature. On the basis of the achieved tests results, the susceptibility to plastic working for the Mg-4%Li-1%Ca alloy was determined. An analysis of the microstructure was conducted both in the initial condition and after plastic deformation with the use of light and scanning microscopy techniques. The applied deformation methods allowed the determination of the influence of process parameters on changes in the microstructure and properties of the Mg-4%Li-1%Ca alloy.
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Authors and Affiliations

Iwona Bednarczyk
ORCID: ORCID

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Abstract

This research paper shows the influence of a repeated SPD (Severe Plastic Deformation) plastic forming with the DRECE technique (Dual Rolls Equal Channel Extrusion) on hardening of low carbon IF steel. The influence of number of passes through the device on change of mechanical properties, such as tensile strength TS and yield stress YS, of tested steel was tested. The developed method is based on equal channel extrusion with dual rolls and uses a repeated plastic forming to refinement of structure and improve mechanical properties of metal bands [1-2]. For the tested steel the increase of strength properties after the DRECE process was confirmed after the first pass in relation to the initial material. The biggest strain hardening is observed after the fourth pass.

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Authors and Affiliations

K. Kowalczyk
M. Jabłońska
S. Rusz
I. Bednarczyk
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Abstract

The article presents tests results of the influence of deformation methods on the microstructure and properties of alloy WE43. There were direct extrusion tests and extrusion with KoBo method performed. An assessment of the influence of the methods of deformation on the microstructure and the mechanical properties of the achieved rods from alloy WE43 was conducted. There was an analysis of microstructure carried out with the use of light and scanning microscopy techniques in the initial state and after plastic deformation. Static tensile test was conducted in temperature of 350°C at a speed of 0.0001 m·s–1 and microhardness measurements were performed of HV0.2. On the basis of the achieved mechanical tests results it was stated that in the temperature of 350°C for samples deformed with the use of KoBo method there was an effect of superplastic flow found. The value of elongation achieved was 250% which was 3 times higher than in case of classic extrusion (80%).

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Authors and Affiliations

I. Bednarczyk
D. Kuc
M. Tkocz
A. Tomaszewska
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Abstract

The paper presents a multi-scale mathematical model dedicated to a comprehensive simulation of resistance heating combined with the melting and controlled cooling of steel samples. Experiments in order to verify the formulated numerical model were performed using a Gleeble 3800 thermo-mechanical simulator. The model for the macro scale was based upon the solution of Fourier-Kirchhoff equation as regards predicting the distribution of temperature fields within the volume of the sample. The macro scale solution is complemented by a functional model generating voluminal heat sources, resulting from the electric current flowing through the sample. The model for the micro-scale, concerning the grain growth simulation, is based upon the probabilistic Monte Carlo algorithm, and on the minimization of the system energy. The model takes into account the forming mushy zone, where grains degrade at the melting stage – it is a unique feature of the micro-solution. The solution domains are coupled by the interpolation of node temperatures of the finite element mesh (the macro model) onto the Monte Carlo cells (micro model). The paper is complemented with examples of resistance heating results and macro- and micro-structural tests, along with test computations concerning the estimation of the range of zones with diverse dynamics of grain growth.

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Authors and Affiliations

M. Hojny
M. Głowacki
P. Bała
W. Bednarczyk
W. Zalecki
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Abstract

The paper presents the results of tests concerning the effect of the extrusion process in the complex strain state on the microstructure and properties of one of magnesium alloy with aluminium, zinc and manganese, designated AZ61. Due to its specific gravity, it is increasingly being used in the automotive and aerospace industries to reduce the weight of structural elements. As a result of plastic deformation processes, rods with a diameter of 8, 6 and 4 mm were obtained from AZ61 magnesium alloy. The microstructure analysis was performed using light and electron microscopy (STEM) techniques in the initial state and after plastic deformation. Microstructure studies were supplemented with a quantitative analysis using the Metilo program. A number of stereological parameters were determined: average diameter of grain, shape factor. A static tensile test was carried out at 250ºC and 300ºC, at deformation rates of 0.01, 0.001 and 0.0001 m·s–1. Better plastic properties after deformation using KoBo method were obtained than with conventional extrusion.

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Authors and Affiliations

Iwona Bednarczyk
ORCID: ORCID
D. Kuc
A. Tomaszewska
M. Tkocz
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Abstract

This article is a description of the progress of research and development in the area of massive large-scale castings - slag ladles implemented in cooperation with the Faculty of Foundry Engineering of UST in Krakow. Slag ladles are the one of the major castings that has been developed by the Krakodlew (massive castings foundry) for many years. Quality requirements are constantly increasing in relation to the slag ladles. Slag ladles are an integral tool in the logistics of enterprises in the metallurgical industry in the process of well-organized slag management and other by-products and input materials. The need to increase the volume of slag ladles is still growing. Metallurgical production is expected to be achieved in Poland by 2022 at the level of 9.4 million Mg/year for the baseline scenario - 2016 - 9 million Mg/year. This article describes the research work carried out to date in the field of technology for the production of massive slag ladles of ductile cast iron and cast steel.

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Authors and Affiliations

M. Paszkiewicz
Edward Guzik
ORCID: ORCID
D. Kopyciński
ORCID: ORCID
Barbara Kalandyk
ORCID: ORCID
A. Burbelko
ORCID: ORCID
D. Gurgul
S. Sobula
ORCID: ORCID
A. Ziółko
K. Piotrowski
ORCID: ORCID
P. Bednarczyk

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