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Wyświetlanie 1-8 z 8
Tytuł:
Effect of friction stir processing (FSP) on microstructure and hardness of AlMg10/SiC composite
Autorzy:
Iwaszko, J.
Kudła, K.
Powiązania:
https://bibliotekanauki.pl/articles/200735.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
friction stir processing
AlMg10/SiC composite
microstructure
kompozyt AlMg10/SiC
mikrostruktura
FSP
Opis:
The AlMg10 aluminum alloy reinforced with SiC particles was subjected to friction stir processing (FSP). The composite was made by mechanical mixing and gravity casting. The mass fraction of SiC particles in the composite was about 10%. Evaluation of the effects of FSP treatment was performed by means of light microscopy, scanning electron microscopy, EDS and hardness measurement. It was found that the inhomogeneous distribution of SiC particles and their agglomeration, which were observable in the cast composite, were completely eliminated after FSP modification. The treatment was also accompanied by homogenisation of the material in the mixing zone as well as fragmentation of both the matrix grain of the composite and SiC particles. In the case of SiC particles, a change in their shape was also observed. In the as-cast composite, particles with dimensions from 30 to 60 μm and a sharp-edged polyhedral shape prevailed, while in the material subjected to friction treatment, particles with dimensions from 20 to 40 μm and a more equiangular shape prevailed. Pores and other material discontinuities occurring frequently in the as-cast composite were completely eliminated after friction modification. The recorded changes in the microstructure of the material were accompanied by an increase in the hardness of the composite by nearly 35%. The conducted investigations have shown that FSP modification of the AlMg10/SiC composite made by the casting method leads to favorable microstructural changes in the surface layer and may be an alternative solution to other methods and technologies used in surface engineering.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 2; 185-192
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface modification of ZrO2-10 wt. % CaO plasma sprayed coating
Autorzy:
Iwaszko, J.
Kudła, K.
Powiązania:
https://bibliotekanauki.pl/articles/200857.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
remelting treatment
GTAW method
oxide coating
przetapianie
metoda TIG
powłoka tlenkowa
GTAW
Opis:
Oxide ZrO2-CaO plasma-sprayed coatings were remelted using the modified gas tungsten arc welding (GTAW) method. The original two-burner set, generating a free independent arc, was used in the treatment. The samples were subjected to structural examination using light and scanning electron microscopes, and energy-dispersive X-ray microanalysis (EDX). A substantial heterogeneity of the plasma-sprayed coatings was found, observable with a laminar structure, significant porosity, and step change in the concentration of the elements. Significant changes in the structure were found after the remelting treatment. Both microscopic and EDX investigations showed that the treatment leads to a reduction in the heterogeneity of the chemical composition of the coating material and to a loss of structural characteristics typical for plasma-sprayed coatings.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 4; 937-942
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Cu/SiC surface composite produced by friction stir processing
Autorzy:
Iwaszko, J.
Kudła, K.
Powiązania:
https://bibliotekanauki.pl/articles/202068.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
copper
metal matrix surface composite
friction stir processing
Opis:
The main aim of this work was to obtain a copper matrix surface composite using friction stir processing (FSP). The reinforced phase was SiC particles with an average size of 5 mm. The effect of the reinforcement on the microstructure, hardness and wear behaviour were analysed. The friction treatment was carried out using a truncated cone-shaped tool with a threaded side surface. Multi-chamber technology was used to produce the composite microstructure in the copper surface layer. Changes in the material microstructure were assessed by light microscopy and scanning electron microscopy. Comparative measurement of the hardness of the initial and treated material as well as wear resistance tests were also carried out. A favourable effect of the surface treatment on the microstructure and properties of the copper was found. As a result of the friction treatment there was strong grain refinement in the copper surface layer. The average grain size in the stirring zone was about 3 mm and was over 21 times smaller than the average grain size in the initial material. Intensive dispersion of the SiC particles in the modified layer was also found, leading to the formation of a copper matrix composite. The effect of microstructural changes in the surface layer of the material and formation of the surface composite was an over two-fold increase in the hardness of the material and an increase in wear resistance.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 3; 555-564
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technological aspects of friction stir processing of AlZn5.5MgCu aluminum alloy
Autorzy:
Iwaszko, J.
Kudła, K.
Fila, K.
Powiązania:
https://bibliotekanauki.pl/articles/201513.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
FSP technology
AlZn5.5MgCu aluminium alloy
technologia FSP
stop aluminium AlZn5.5MgCu
Opis:
FSP technology was used to modify the surface layer of the AlZn5.5.MgCu aluminum alloy by enriching its SiC particles. For this goal the FSP multi-chamber method was used. The SiC powder was placed in separated chambers hollowed in the modified material perpendicular to the surface of the sample. In order to achieve a more even distribution of the reinforcing phase in the aluminum alloy matrix and to minimize the risk of uncontrolled displacement of the SiC powder at the time of inserting the pin into the material, a two-step treatment was applied. In the first one, the working area of the pin was shifted relative to the axis of the chambers by ΔL. In the second step of the treatment the tool moved centrally along the line of chambers. As a result of friction treatment, intensive sputtering of SiC particles in the surface of the aluminum alloy and strong refinement of the alloy were observed. The consequence of the microstructural changes in the surface layer of the material and the formation of a metal-ceramic composite microstructure was a significant increase in the hardness of the aluminum alloy.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 5; 713-719
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Friction Stir Processing (FSP) on the Microstructure and Properties of AM60 Magnesium Alloy
Autorzy:
Iwaszko, J.
Kudła, K.
Fila, K.
Strzelecka, M.
Powiązania:
https://bibliotekanauki.pl/articles/355521.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
friction stir processing
magnesium alloy
Opis:
The samples of the as-cast AM60 magnesium alloy were subjected to Friction Stir Processing (FSP). The effect of FSP on the microstructure of AM60 magnesium alloy was analyzed using optical microscopy and X-ray analysis. Besides, the investigation of selected properties, i.e. hardness and resistance to abrasion wear, were carried out. The carried out investigations showed that FSP leads to more homogeneous microstructure and significant grain refinement. The average grain size in the stirred zone (SZ) was about 6-9 μm. in the thermomechanically affected zone (TMAZ), the elongated and deformed grains distributed along flow line were observed. The structural changes caused by FSP lead to an increase in microhardness and wear resistance of AM60 alloy in comparison to their non-treated equivalents. Preliminary results show that friction stir processing is a promising and an effective grain refinement technique.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1555-1560
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface modification of AZ91 magnesium alloy using GTAW technology
Autorzy:
Iwaszko, J.
Strzelecka, M.
Kudła, K.
Powiązania:
https://bibliotekanauki.pl/articles/201803.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
remelting treatment
GTAW technology
AZ91 magnesium alloy
przetapianie
technologia GTAW
stop magnezu AZ91
Opis:
In this study, surface remelting treatment of the AZ91 magnesium alloy by means of welding using a non-consumable electrode in an inert gas shield was carried out. Three variants of surface treatment were used, i.e. the single torch variant with a single heat source without cooling down the samples, the single torch variant with a single heat source and a cooling system with liquid nitrogen, and the double welding torch variant with a double heat source in the torches operating in a tandem configuration. Experimental verification of the applied apparatus solutions was based on both macro- and microstructural assessment of the obtained effects. Comparative analysis of the variants used and the obtained microstructural results allowed the authors to indicate the deficiencies and limitations of particular solutions and to single out the best solution that would be useful for modifying the surface layers of magnesium alloys, as well as other materials having a strong oxygen affinity.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 6; 917-926
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of urban conditions on the occurrence of aphids on Acer platanoides L.
Wpływ środowiska miejskiego na występowanie mszyc na klonie pospolitym (Acer platanoides L.)
Autorzy:
Mackoś-Iwaszko, E.
Lubiarz, M.
Karczmarz, K.
Powiązania:
https://bibliotekanauki.pl/articles/11543016.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Opis:
Cities devastate the natural habitats of animals, but simultaneously form new ecological niches and create conditions far different from natural environments. In these new conditions some insects, such as aphids, can develop quickly and they become important pests. This paper presents the population dynamics of aphids inhabiting the Norway maple in the urban conditions of Lublin. Also shown are relationships among the aphid species inhabiting the studied tree. We have shown that aphids are abundant on Acer platanoides and the most numerous species was Periphyllus aceris. This species was clear superdominant in both of the studied sites (the housing estate site and the street site). Using ecological indices allows us to determine that housing estate site is predominantly characterised by a larger species diversity than the street site. We have also presented that weather conditions have a significant influence on the number of aphids on the Norway maple. The highest number of aphids was observed in 2008, which was characterised by a warm spring. This paper is an attempt to answer the question whether the changes in the number of aphids are a result, of weather and habitat conditions, or, perhaps, also of mutual relations among species.
Miasta niszczą naturalne siedliska zwierząt, ale jednocześnie tworzą nowe nisze ekologiczne i stwarzają całkiem odmienne od naturalnych warunki środowiska. W tych nowych warunkach niektóre owady, jak na przykład mszyce, mogą szybko się rozwijać i stają się ważnymi szkodnikami. Niniejsza praca prezentuje dynamikę populacji mszyc zasiedlających klon pospolity w warunkach miejskich Lublina. Ponadto zaprezentowane są wzajemne relacje pomiędzy gatunkami mszyc zasiedlającymi badany gatunek drzewa. Wykazano, że mszyce licznie zasiedlają klon pospolity (Acer platanoides), a najliczniejszym gatunkiem okazał się Periphyllus aceris. Gatunek ten był wyraźnym super dominantem w obu stanowiskach badawczych (osiedlowym i przyulicznym). Przy zastosowaniu wskaźników ekologicznych wykazano, że stanowisko osiedlowe charakteryzuje się większa różnorodnością gatunkową, niż stanowisko przyuliczne. Wykazano także, że warunki pogodowe istotnie wpływają na liczebność mszyc na klonie pospolitym. Najwyższą liczebność mszyc zanotowano w 2008 r., który charakteryzował się ciepłą wiosną. Niniejsza praca jest próbą odpowiedzi na pytanie, czy zmiany liczebności mszyc wynikają z wpływu warunków pogodowych i siedliskowych, czy być może także z wzajemnych relacji pomiędzy tymi gatunkami.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2015, 14, 5; 189-207
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utilisation of high-energy heat sources in magnesium alloy surface layer treatment
Wykorzystanie wysokoenergetycznych źródeł ciepła w obróbce warstwy wierzchniej stopów magnezu
Autorzy:
Szafarska, M.
Iwaszko, J.
Kudła, K.
Łęgowik, I.
Powiązania:
https://bibliotekanauki.pl/articles/355025.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
surface layer modification
magnesium alloys
modyfikacja warstwy wierzchniej
stopy magnezu
Opis:
The main aim of the study was the evaluation of magnesium alloy surface treatment effectiveness using high-energy heat sources, i.e. a Yb-YAG Disk Laser and the GTAW method. The AZ91 and AM60 commercial magnesium alloys were subject to surface layer modification. Because of the physicochemical properties of the materials studied in case of the GTAW method, it was necessary to provide the welding stand with additional equipment. A novel two-torch set with torches operating in tandem was developed within the experiment. The effectiveness of specimen remelting using a laser and the GTAW method was verified based on macro- and microscopic examinations as well as in X-ray phase analysis and hardness measurements. In addition, the remelting parameters were optimised. The proposed treatment methodology enabled the achieving of the intended result and effective modification of a magnesium alloy surface layer.
Głównym celem pracy była ocena efektywności obróbki powierzchniowej stopów magnezu za pomocą wysokoenergetycznych źródeł ciepła, tj. Yb-YAG Disk Laser i metody GTAW. Modyfikacji warstwy wierzchniej poddano komercyjne stopy magnezu AZ91 i AM60. W przypadku metody GTAW z uwagi na własności fizykochemiczne badanych materiałów konieczne okazało się doposażenie stanowiska spawalniczego. W ramach eksperymentu opracowano nowatorski zespół dwupalnikowy z palnikami pracującymi w układzie tandem. Efektywność przetapiania próbek laserem i metodą GTAW weryfikowano na podstawie badan makro- i mikroskopowych oraz rentgenowskiej analizy fazowej i pomiarów twardości. Dokonano również optymalizacji parametrów przetapiania. Zaproponowana metodyka obróbki pozwoliła na osiągnięcie zamierzonego rezultatu i skuteczną modyfikacje warstwy wierzchniej stopów magnezu.
Źródło:
Archives of Metallurgy and Materials; 2013, 58, 2; 619-624
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-8 z 8

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