Autor: Kwaśniewski, Paweł - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Studies on the influence of AlTi5B1 modifier on the structure and properties of AlCuMg alloys
Autorzy:: Ściężor, Wojciech
Kowal, Radosław
Franczak, Krystian
Grzebinoga, Justyna
Kwaśniewski, Paweł
Kiesiewicz, Grzegorz
Powiązania:: https://bibliotekanauki.pl/articles/1429801.pdf
Data publikacji:: 2021
Wydawca:: Centrum Badań i Innowacji Pro-Akademia
Tematy:: aluminium
AlCuMg
modifier
AlTiB
casting
modyfikator
odlew
Opis:: New materials used in various industries require sufficiently high mechanical properties, fine-grained structure and ease of metal forming while minimizing production costs. For this reason, work is being carried out to develop new groups of alloys that make it possible to increase the strength of the obtained components while reducing their weight, and thus reducing production costs. This article focuses on two aluminium-based alloys with different content of alloying additives: copper and magnesium i.e., AlCu3Mg3 and AlCu4.5Mg6, which were produced by metallurgical synthesis. The as-cast alloys were characterized for their basic physical, mechanical and electrical properties and were subjected to structural analysis. In the next stage, the alloys were modified with 100, 500, 1000 and 2000 ppm of titanium and then their hardness, electrical conductivity and density were tested. Samples were also subjected to microstructural analysis. The obtained results allowed to examine the evolution of the AlCuMg alloy properties depending on the content of alloy additives and the amount of used modifier.
Źródło:: Acta Innovations; 2021, 38; 37-48
2300-5599
Pojawia się w:: Acta Innovations
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Research on Changes in Microstructures and Mechanical Properties of Welding Caps as a Result of their Usage During Resistance Spot Welding Process
Autorzy:: Rdzawski, Zbigniew
Kwaśniewski, Paweł
Głuchowski, Wojciech
Łagoda, Marek
Maleta, Marcin
Boczkal, Sonia
Franczak, Krystian
Powiązania:: https://bibliotekanauki.pl/articles/2203749.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: CuCrZr alloy
resistance spot welding
mechanical properties
microanalysis
tip electrodes
Opis:: Mating electrodes made of copper alloys are commonly used for welding galvanized steel sheets used in the production of car bodies. These alloys are characterized by high mechanical properties, a high level of electrical and thermal conductivity as well as the stability of these properties under changing conditions of current, thermal and mechanical load. Much careful attention was paid to the essence of the ongoing structural changes as well as to the mechanical properties in the welding process (RSW - Resistant Spot Welding) of steel sheets, including high-strength ones. There is a lack of research on structural changes and the related mechanical properties occurring in welding electrodes made of copper alloys caused by the welding process. This study is devoted to these issues and contains a critical review of the research results enabling a better understanding of the relationships between the structure and properties of welding electrodes caused by the cyclic welding process. In order to illustrate the phenomena occurring during the welding process, both in the material to be welded and in the tip electrodes, hardness and structural tests were carried out on electrode samples before and after their exploitation. The data collected in the article supplements a certain lack of information in the literature regarding the microstructural aspects of the welding process of galvanized steel sheets for the production of car bodies. The conducted research may be the starting point for the search for more effective materials for the tip electrodes.
Źródło:: Archives of Metallurgy and Materials; 2023, 68, 1; 295--306
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Evaluation of Wear Mechanisms of Graphites Used for Crystallisers for Continuous Casting
Autorzy:: Brudny, Anna
Kulasa, Joanna
Juszczyk, Barbara
Myalski, Jerzy
Roskosz, Stanisław
Wycisk, R.
Kwaśniewski, Paweł
Strzępek, Paweł
Poręba, Marek
Powiązania:: https://bibliotekanauki.pl/articles/2203941.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: innovative foundry technologies
innovative foundry materials
wear resistance
graphite
crystallizers
tribology
innowacyjne technologie odlewnicze
innowacyjne materiały odlewnicze
odporność na zużycie
grafit
krystalizatory
tribologia
Opis:: This paper presents the results of research concerning the evaluation of tribological properties of graphite materials used, among others, for crystallisers for continuous casting of non-ferrous metals and their alloys. Graphite materials differing not only in their physical properties but also in the technology of their production were selected from a wide range of commercially available products. Wear resistance investigations of the tested graphite materials were carried out on a pin-on-disc tribometer under technically dry friction conditions on a sliding distance of 1000 m. A constant load but variable speed was used in the tests. The mean value of the coefficient of friction and the wear of the material were determined based on the tribological tests carried out. It was observed that as the speed increases, the average value of the coefficient of friction decreases, while the wear increases. A microstructural analysis of the wear track showed that the friction mechanism depends mainly on the graphite formation technology, which is related to the microstructure of the tested materials, and to a lesser extent to their physical and mechanical properties. Varying the speed values made it possible to trace changes in the wear mechanism, on the basis of which it is possible to predict the durability and reliability of graphite crystalliser operation.
Źródło:: Archives of Foundry Engineering; 2022, 22, 4; 109--115
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Julia, Wiktor i szekspirowski dramat
Autorzy:: Kwaśniewski, Aleksander (1954- ).
Powiązania:: Tygodnik Powszechny 2013, nr 49, s. 4-6
Współwytwórcy:: Reszka, Paweł (1969- ). Opracowanie
Data publikacji:: 2013
Tematy:: Polityka wewnętrzna
Polityka zagraniczna
Opis:: Fot.
Dostawca treści:: Bibliografia CBW

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Skocz do pozycji: 5.

Tytuł:: Application of The New Shape Crushing Plate in Machine Crushing Processes
Autorzy:: Ciężkowski, Paweł
Maciejewski, Jan
Bąk, Sebastian
Kwaśniewski, Arkadiusz
Powiązania:: https://bibliotekanauki.pl/articles/178455.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: double-toggle jaw crusher
crushing process
crushing plate
technical performance
Opis:: The results of studies of the crushing process in a double toggle jaw crusher are presented. This process was carried out on six sets of crushing plates. The first three of them are used in industrial crushers – plates with a flat working surface and a triangular profile (in this work, under consideration were profiles with teeth angle γ = 90°). The fourth and fifth type refer to plates with a variable pitch t and teeth height with a triangular shape of the teeth. In the sixth solution, plates with variable pitch and width of the wedged teeth are proposed. The results of the basic process parameters are shown, that is, average degree of fineness n, technical performance W_t, crushing energy L and crushing force F, sieve analysis of crushing product. The obtained results are the basis for the assessment of the suitability of various types of plates, especially plates with a new profile, which have an altered shape in comparison with the plates used in crushers so far. The crushing tests were carried out with the same dimension of outlet slot e_r = 24 mm, close to the pitch size for plates with triangular profile. Tests were performed on the "Mucharz" sandstone. Samples from a series of blocks of different size and geometric shape were prepared. This work also presents feed mass influence on crushing process efficiency. The plates with variable pitch and width of teeth are beneficial because of lower crushing force and energy.
Źródło:: Studia Geotechnica et Mechanica; 2020, 42, 1; 83-96
0137-6365
2083-831X
Pojawia się w:: Studia Geotechnica et Mechanica
Dostawca treści:: Biblioteka Nauki