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    Wyświetlanie 1-13 z 13
    Tytuł:
    Malacofauna of selected water bodies of the city of Szczecin
    Autorzy:
    Janicki, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/83087.pdf
    Data publikacji:
    1999
    Wydawca:
    Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
    Opis:
    Studies on molluscs of selected water bodies of the city of Szczecin (NW Poland), carried out in 1997, revealed the occurrence of 11 snail and 5 bivalve species. Two groups of water bodies were distinguished, of different species composition: Głębokie lake on one hand and the ponds with the Osówka stream on the other. Overall dominants were Potamopyrgus antipodarum (Gray), an expanding species, and Sphaerium corneum (L.).
    Źródło:
    Folia Malacologica; 1999, 07, 2
    1506-7629
    Pojawia się w:
    Folia Malacologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laser-Assisted Copper Oxidation
    Autorzy:
    Musztyfaga-Staszuk, M.
    Gawlińska-Nęcek, K.
    Janicki, D.
    Panek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/353054.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Cu
    CuO
    Cu2O
    laser micro-processing
    Opis:
    The paper proposes a method for copper sheet oxidation by using a laser beam. The thickness of the oxide layer increases with temperature growth; therefore, the proper parameters of the experiment such as pulse power, frequency and the speed of the beam were adjusted. High power diode laser was used in the investigations. The topography of the oxidised copper sheets was determined using atomic force microscopy (AFM) and scanning electron microscopy with EDS analyses. Optical parameters of the deposited layer were characterised by spectrophotometry. Both roughness and thickness of the investigated samples were measured using the confocal laser scanning microscope. The technological recommendations for the laser micro-machining technology to obtain copper sheet oxidation by using the high power laser beam were selected.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 767-770
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research of electrolyte low loss in typical ECM gaps
    Autorzy:
    Paczkowski, T.
    Zdrojewski, J.
    Bujnowski, S.
    Janicki, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/99886.pdf
    Data publikacji:
    2012
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    ECM
    electrolyte flow loss
    curvilinear electrode surfaces
    Opis:
    This paper presents the results of research of hydraulic loss during electrolyte flow through gaps typical for ECM machining. The research was conducted on a test station where inducing an oscillatory movement of electrodes was possible. Appropriately prepared electrodes with curvilinear outlines were placed in a machining unit which allowed for measuring the pressure of the electrolyte flow in eight points on the electrode surface and also interelectrode gap inlet and outlet. Additionally, the results of pressure measurements were compared with results obtained from a computer simulation.
    Źródło:
    Journal of Machine Engineering; 2012, 12, 2; 86-91
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructural Evolution During Laser Surface Alloying of Ductile Cast Iron with Titanium
    Autorzy:
    Janicki, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/351680.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    in-situ composites
    TiC
    laser surface alloying
    diode laser
    ductile cast iron
    Opis:
    Diode laser surface alloying process was used to the in-situ synthesis of TiC-reinforced composite surface layers on the ductile cast iron substrate. The obtained composite surface layers were investigated using optical and scanning electron microscopy, and XRD diffraction. It was found that the morphology and fraction of TiC phase is directly dependent upon both the concentration of titanium in the molten pool and also the solidification rate. With increasing titanium content, the fraction of TiC increases, whereas the fraction of cementite decreases. The TiC phase promotes a heterogeneous nucleation of primary austenite grains, what reduces a tendency of cracking in the alloyed layers.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2425-2431
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties of the Aluminium Alloy EN AC-51100 after Laser Surface Treatment
    Autorzy:
    Tański, T.
    Pakieła, W.
    Janicki, D.
    Tomiczek, B.
    Król, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/353290.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    laser treatment
    aluminium alloy
    silicon carbide
    wear resistance
    Opis:
    In this paper, the influence of a laser surface treatment on the structure and properties of aluminium alloy has been determined. The aim of this work was to improve the tribological properties of the surface layer of the EN AC-51100 aluminium alloy by simultaneously melting and feeding silicon carbide particles into the molten pool. The silicon carbide powder was introduced into the liquid metal using a gravity feeder within a constant feed rate of 1 g/min. A high power diode laser (HPDL) was used for remelting. Laser beam energies used in experiments were 1.8 kW, 2.0 kW and 2.2 kW, combined with the constant velocity of 50 mm/min. As a result of the laser treatment on the aluminium alloy, a composite layer with greater hardness and wear resistance compared to the based material was obtained.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 1; 199-204
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Disk Laser Welding of Armor Steel
    Spawanie laserem dyskowym stali pancernej
    Autorzy:
    Janicki, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/354180.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    laser welding
    disk laser
    armor steel
    Armox 500T
    butt joint
    spawanie laserowe
    laser dyskowy
    stal pancerna
    połączenie stykowe
    Opis:
    The paper describes the application of an Yb:YAG disk laser with a maximum output of 3.3 kW for the butt welding of armor steel plates ARMOX 500T 3.6 mm thick. The influence of laser welding parameters such as laser power beam, welding speed, focal point position on weld quality and mechanical properties of joints was studied. A proper selection of disk laser welding parameters provides non-porous and cracks free fully-penetrated welds with the aspect ratio up to 6.4. There was approx. 40% reduction in the hardness of heat affected zone (HAZ) in comparison to hardness of the base material (BM). The hardness values at the weld metal and the BM were similar. The joints exhibited about 15% lower ultimate tensile strength when compared with that of the BM. Charpy absorbed energy of the joints was approx. 30% lower than that of the BM.
    Artykuł prezentuje wyniki badań procesu spawania złączy doczołowych blach ze stali pancernej Armox 500T o grubości 3.6 mm, laserem dyskowym Yb:YAG o maksymalnej mocy 3.3 kW. Określono wpływ parametrów spawania tj. mocy wiązki laserowej, prędkości spawania oraz położenia ogniska wiązki laserowej względem spawanej powierzchni na jakość złączy. Wykazano, iż istnieje pole parametrów spawania zapewniające uzyskanie złączy doczołowych wolnych od pęknięć i porowatości oraz współczynniku kształtu spoiny do ok. 6.4. W strefie wpływu ciepła następuje 40% zmniejszenie twardości w stosunku do materiału rodzimego oraz obszary spoiny. Wytrzymałość na rozciąganie złączy jest około 15% niższe od wytrzymałości materiały rodzimego. Udarność złaczy jest niższa o 30% od udarności materiału rodzimego.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 4; 1641-1646
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Napawanie laserowe warstw kompozytowych na osnowie stopu Inconel 625
    Laser cladding of Inconel 625-based composite coatings
    Autorzy:
    Janicki, D.
    Górka, J.
    Kotarska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/115093.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    napawanie laserowe
    powłoka kompozytowa
    Inconel 625
    laser cladding
    composite coating
    Opis:
    Artykuł prezentuje wyniki badań procesu napawania laserem diodowym warstw wierzchnich kompozytowych na osnowie stopu niklu Inconel 625 wzmacnianych cząstkami WC oraz Cr3C2. Określono wpływ energii linowej napawania oraz morfologii cząstek fazy umacniającej (FU) na stopień jej rozpuszczenia w osnowie warstwy. Ponadto, określono wpływ morfologii cząstek FU na odporność erozyjną warstw.
    Inconel 625-based composite coatings reinforced by WC and Cr3C2 particles have been produced via a diode laser cladding process. The effect of heat input level and morphology of the reinforcing particles on the degree of their dissolution has been established. Additionally, the influence of the morphology of the reinforcing particles on the erosive wear behaviour of the coatings was studied.
    Źródło:
    Welding Technology Review; 2018, 90, 9; 6-12
    0033-2364
    2449-7959
    Pojawia się w:
    Welding Technology Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diode Laser Surface Alloying of Armor Steel with Tungsten Carbide
    Autorzy:
    Janicki, D.
    Górka, J.
    Kwaśny, W.
    Gołombek, K.
    Kondracki, M.
    Żuk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/351086.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    laser surface alloying
    diode laser
    armor steel
    metal matrix composite
    tungsten carbide
    Opis:
    Metal matrix composite (MMC) surface layers reinforced by WC were fabricated on armor steel ARMOX 500T plates via a laser surface alloying process. The microstructure of the layers was assessed by scanning electron microscopy and X-ray diffraction. The surface layers having the WC fraction up to 71 vol% and an average hardness of 1300 HV were produced. The thickness of these layers was up to 650 μm. The addition of a titanium powder in the molten pool increased the wettability of WC particles by the liquid metal in the molten pool increasing the WC fraction. Additionally, the presence of titanium resulted in the precipitation of the (Ti,W)C phase, which significantly reduced the fraction of W-rich complex carbides and improved a structural integrity of the layers.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2A; 473-481
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Laser Feeding on Heat Treated Aluminium Alloy Surface Properties
    Autorzy:
    Labisz, K.
    Tański, T.
    Janicki, D.
    Borek, W.
    Lukaszkowicz, K.
    Dobrzański, L. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/353371.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    manufacturing and processing
    ceramic powder
    laser surface treatment
    aluminium alloys
    HPDL laser
    Opis:
    In this paper are presented the investigation results concerning microstructure as well as mechanical properties of the surface layer of cast aluminium-silicon-copper alloy after heat treatment alloyed and/ or remelted with SiC ceramic powder using High Power Diode Laser (HPDL). For investigation of the achieved structure following methods were used: light and scanning electron microscopy with EDS microanalysis as well as mechanical properties using Rockwell hardness tester were measured. By mind of scanning electron microscopy, using secondary electron detection was it possible to determine the distribution of ceramic SiC powder phase occurred in the alloy after laser treatment. After the laser surface treatment carried out on the previously heat treated aluminium alloys, in the structure are observed changes concerning the distribution and morphology of the alloy phases as well as the added ceramic powder, these features influence the hardness of the obtained layers. In the structure, there were discovered three zones: the remelting zone (RZ) the heat influence zone (HAZ) and transition zone, with different structure and properties. In this paper also the laser treatment conditions: the laser power and ceramic powder feed rate were investigated. The surface laser structure changes in a manner, that there zones are revealed in the form of. This carried out investigations make it possible to develop, interesting technology, which could be very attractive for different branches of industry.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 741-746
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    HPDL Remelting of Anodised Al-Si-Cu Cast Alloys Surfaces
    Autorzy:
    Labisz, K.
    Tański, T.
    Janicki, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/380279.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technologies
    innovative foundry materials
    remelting
    surface layer
    aluminium alloys
    anodisation
    HPDL laser
    innowacyjne technologie odlewnicze
    innowacyjne materiały odlewnicze
    przetopienie
    warstwa wierzchnia
    stopy aluminium
    anodowanie
    laser HPDL
    Opis:
    The results of the investigations of the laser remelting of the AlSi9Cu4 cast aluminium alloy with the anodised and non-anodised surface layer and hardness changes have been presented in this paper. The surface layer of the tested aluminium samples was remelted with the laser of a continuous work. The power density was from 8,17•103 W/cm2 to 1,63•104 W/cm2. The metallographic tests were conducted in form of light microscope investigations of the received surface layer. The main goal of the investigation was to find the relation between the laser beam power and its power density falling on a material, evaluating the shape and geometry of the remelted layers and their hardness. As the substrate material two types of surfaces of the casted AlSi9Cu4 alloy were applied – the non–treated as cast surface as well the anodized surface. As a device for this type of surface laser treatment the High Power Diode Laser was applied with a maximum power of 2.2 kW and the dimensions of the laser beam focus of 1.8 x 6.8 mm. By mind of such treatment it is also possible to increase hardness as well eliminate porosity and develop metallurgical bonding at the coating-substrate interface. Suitable operating conditions for HPDL laser treatment were finally determined, ranging from 1.0 to 2.0 kW. Under such conditions, taking into account the absorption value, the effects of laser remelting on the surface shape and roughness were studied. The results show that surface roughness is reduced with increasing laser power by the remelting process only for the non-anodised samples, and high porosity can be found in the with high power remelted areas. The laser influence increases with the heat input of the laser processing as well with the anodisation of the surface, because of the absorption enhancement ensured through the obtained alumina layer.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 2s; 45-48
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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