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    Wyświetlanie 1-5 z 5
    Tytuł:
    STEM-EDX and FIB-SEM Tomography of ALLVAC 718Plus Superalloy
    Autorzy:
    Kruk, A.
    Cempura, G.
    Lech, S.
    Czyrska-Filemonowicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/354670.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    TEM
    SEM
    STEM-EDX tomography
    FIB-SEM tomography
    Allvac 718Plus
    Opis:
    Allvac 718Plus (718Plus) is a high strength, corrosion resistant nickel- based superalloy used for application in power generation, aeronautics and aerospace industry. The 718Plus microstructure consists of a γ matrix with γ’-Ni3(Al,Ti) and some δ- Ni3Nb phases as well as lamellar particles (η-Ni3Ti, η*-Ni6AlNb or Ni6(Al,Ti)Nb) precipitated at the grain boundaries. The primary strengthening mechanism for this alloy is a precipitation hardening, therefore size and distribution of precipitates are critical for the performance of the alloy. The aim of this study was to characterize precipitates in the 718Plus superalloy using Scanning Transmission Electron Microscope combined with Energy Dispersive X-ray Spectroscopy (STEM-EDX) and Focused Ion Beam Scanning Electron Microscope (FIB-SEM). The STEM-EDX and FIB-SEM tomography techniques were used for 3D imaging and metrology of the precipitates. Transmission electron microscopy and EDX spectroscopy were used to reveal details of the 718Plus microstructure and allow determine chemical composition of the phases. The study showed that electron tomography techniques permit to obtain complementary information about microstructural features (precipitates size, shape and their 3D distribution) in the reconstructed volume with comparison to conventional particle analysis methods, e.g. quantitative TEM and SEM metallography.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 535-542
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sintered Steels Coated with a Chromium Layer Doped with Diamond Nanoparticles
    Autorzy:
    Petkov, V.
    Valov, R.
    Witkowska, M.
    Madej, M.
    Cempura, G.
    Sułowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/355336.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sintered steels
    mechanical properties
    coating layer
    Opis:
    Electrochemical Cr coatings doped with diamond nanoparticles were deposited on sintered steels with different carbon contents (0.2-0.8 wt.-%). The mechanical properties of surfaces as hardness and wear resistance increase as compared to the steel substrate. Microcutting and microgridding mechanisms were observed after tribological tests, but also adhesive wear in some areas was observed. X-ray examination indicated that the layer was textured, with the exception of the sample with the highest concentration of diamond nanoparticles in the electrolyte (42 g/l). The intensity ratio ICr110/ICr200 was calculated and compared with the indices for a standard sample. The greatest differences in the intensity ratio occurred for the samples with low carbon content (0.2% C). On the other hand, more the material is textured the greater the difference.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 4; 1633-1638
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanocomposite chromium coatings on aluminum alloys
    Autorzy:
    Gidikova, N.
    Valov, R.
    Petkov, V.
    Sułowski, M.
    Witkowska, M.
    Cempura, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/391428.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    chromium coating
    aluminum
    nanodiamond particles
    electrochemical plating
    Opis:
    Chromium coatings modified with nanodiamond particles were deposited on aluminum alloys. The concentration of the nanodiamond particles in the chrome plating electrolyte was from 5 to 25 g/l. The thickness of the layer varied between 30 and 70 μm. The layers were prepared with the same electrolytic conditions and were measured with a metallographic microscope. The maximum microhardness of the coating was 840 kg/mm2. X-ray diffraction analysis was performed with a Siemens D500 apparatus using the Bragg-Brentano technique. The distribution of Cr, Al and O in the cross section was studied by SEM-EDS. It was found that the layers were homogenous – only consisted of chromium. The coatings were also studied for non-destructivity by X-ray 3D computed tomography. It was found that the coatings were intact and continuous along the section. In order to obtain the maximum yield of chromium and maximum thickness of the layer, the optimum nanodiamond particle concentration was 10 g/l.
    Źródło:
    Prace Instytutu Odlewnictwa; 2017, 57, 4; 241-244
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure characterization of tungsten based alloys for fusion application
    Charakteryzacja mikrostuktury stopów na osnowie wolframu przeznaczonych do zastosowań w procesach syntezy jądrowej
    Autorzy:
    Cempura, G.
    Kruk, A.
    Thomser, C.
    Wirtz, M
    Czyrska-Filemonowicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/356314.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fusion
    tungsten based alloys
    electron microscopy
    electron tomography
    fuzja
    stopy na bazie wolframu
    mikroskopia elektronowa
    tomografia elektronowa
    Opis:
    The microstructure of two tungsten based alloys (W-1.1%TiC and W-1.7% TiC) was characterized using light microscopy, analytical electron microscopy and electron tomography. These alloys represent a class of W based dispersion strengthened alloys with TiC used as strengthening particles. Addition of TiC leads to improved creep resistance and tensile strength of the W based alloys. The results show that the W-1.7%TiC alloy exhibits large scatter in grain size, much higher porosity and contains also Ti-O particles. The W-1.1%TiC alloy has fine grained microstructure with uniformly distributed fine TiC particles within the matrix and low porosity. As a result of the different microstructure, the W-1.1%TiC alloy exhibits better mechanical properties, when compared to the W-1.7%TiC alloy.
    W pracy przedstawiono wyniki badań mikrostruktury dwóch stopów wolframu: W-1.1%TiC oraz W-1.7%TiC. Badania przeprowadzono z wykorzystaniem technik mikroskopii świetlnej, analitycznej mikroskopii elektronowej oraz tomografii elektronowej. Przebadane stopy reprezentują grupę stopów wolframu umacnianych dyspersyjnie cząstkami TiC. Dodatek TiC poprawia odporność na pełzanie oraz wytrzymałość tych stopów. Badania wykonane dla stopu W-1.7%TiC wskazują na duże różnice w wielkości ziarna, duża porowatość oraz występowanie cząstek TiO. Stop W-1.1TiC posiada drobnoziarnistą strukturę, niską porowatość oraz równomiernie rozmieszczone cząstki TiC w osnowie W. Stop W-1.1%TiC charakteryzuje się znacznie lepszymi właściwościami mechanicznymi niż stop W-1.7%TiC.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 2; 473-476
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Composite Coatings of Chromium and Nanodiamond Particles on Steel
    Autorzy:
    Gidikova, N.
    Sulowski, M.
    Petkov, V.
    Valov, R.
    Cempura, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/356289.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite chromium coating
    nanodiamond particles
    SEM-EDS analysis
    Opis:
    Chrome plating is used to improve the properties of metal surfaces like hardness, corrosion resistance and wear resistance in machine building. To further improve these properties, an electrodeposited chromium coating on steel, modified with nanodiamond particles is proposed. The nanodiamond particles (average size 4 nm measured by TEM) are produced by detonation synthesis (NDDS). The composite coating (Cr+NDDS) has an increased thickness, about two times greater microhardness and finer micro-structure compared to that of unmodified chromium coating obtained under the same galvanization conditions. In the microstructure of specimen obtained from chrome electrolyte with concentration of NDDS 25 g/l or more, “minisections” with chromium shell were found. They were identified by metallographic microscope and X-ray analyser on etched section of chromium plated sample. The object of further research is the dependence of the presence of NDDS in the composite coating from the nanodiamond particles concentration in the chroming electrolyte.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2421-2424
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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