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    Wyświetlanie 1-7 z 7
    Tytuł:
    A brief overview and metallography for commonly used materials in aero jet engine construction
    Autorzy:
    Belan, J.
    Vasko, A.
    Kucharikova, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/111670.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    aluminium alloy
    titanium alloy
    nickel-base alloys
    metallography procedures
    B/W and colour contrast
    stop aluminium
    stop tytanu
    stopy na bazie niklu
    odczynnik trawiący
    Opis:
    Aluminium, titanium, and nickel base alloys are mostly and widely used for aircraft jet engine construction. A proper evaluation of its microstructure is important from working safety point of view. To receive a well prepared sample of microstructure, some important steps have to be undertaken. Except for proper grinding and polishing of a sample, structure developing is a significant step, too. In order to develop microstructure various chemical reagents were used to achieve the best results for microstructure evaluation. The chemical reagents were used according to the previous knowledge and some new ones were also tested. Aluminium AK4-1č, titanium VT – 8, and nickel VŽL – 14 and ŽS6 – U alloys were used as an experimental materials. Alloy AK4-1č is used for fan blade production with working temperatures up to 300°C. It is a forged piece of metal machined down into final shape by five-axe milling machine. Alloy VT – 8 is used for high pressure compressor rotor blade production with working temperatures up to 500°C. Blades are forged as well and finally grinded. Finally nickel base alloys VŽL – 14 and ŽS6 – U are used for turbine blade production with working temperatures up 950°C. Blades for turbine are casted into mould with reducible models.
    Źródło:
    Production Engineering Archives; 2017, 17; 9-14
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of low and high frequency fatigue tests
    Autorzy:
    Vasko, A.
    Belan, J.
    Kucharikova, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/111844.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    fatigue test
    low frequency cyclic loading
    high frequency cyclic loading
    nodular cast iron
    test zmęczeniowy
    cykliczne obciążenie niskoczęstotliwościowe
    cykliczne obciążenie o wysokiej częstotliwości
    żeliwo sferoidalne
    Opis:
    The paper presents the results of low and high frequency fatigue tests carried out on nodular cast iron. The specimens of synthetic nodular cast irons from three different melts were studied in the high cycle fatigue region (from 105 to 108 cycles) using fatigue experimental equipments for low and high frequency cyclic loading. Low frequency fatigue tests were carried out at frequency f ≈ 120 Hz using the fatigue experimental machine Zwick/Roell Amsler 150HFP 5100; high frequency fatigue tests were carried out at frequency f ≈ 20 kHz using the ultrasonic fatigue testing device KAUP-ZU. Both fatigue tests were realised at sinusoidal cyclic push-pull loading (stress ratio R = –1) at ambient temperature (T = 20 ± 5 °C).
    Źródło:
    Production Engineering Archives; 2017, 17; 15-18
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of structure and mechanical properties of nodular cast irons after casting and after heat treatment
    Autorzy:
    Vaško, A.
    Belan, J.
    Kuchariková, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/114859.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    nodular cast iron
    ferritizing annealing
    isothermal heat treatment
    żeliwo sferoidalne
    wyżarzanie ferrytyczne
    obróbka cieplna izotermiczna
    Opis:
    The paper deals with the influence of charge composition on microstructure and mechanical properties of synthetic nodular cast irons after casting and after heat treatment (ferritizing annealing and isothermal heat treatment). Chemical composition of individual melts was regulated alternatively by carburizer and ferrosilicon (FeSi) or metallurgical silicon carbide (SiC). The results of experiments show that SiC additive positively influences the microstructure as well as mechanical properties of nodular cast iron, especially in specimens from the melts with higher ratio of steel scrap in the charge.
    Źródło:
    Zeszyty Naukowe. Quality. Production. Improvement; 2017, 1 (6); 31-38
    2544-2813
    Pojawia się w:
    Zeszyty Naukowe. Quality. Production. Improvement
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of cooling rate on selected structural parameters of advanced cast Ni – base superalloys
    Autorzy:
    Belan, J.
    Vaško, A.
    Kuchariková, L.
    Švecová, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/114811.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    Ni-base superalloys
    quantitative metallography methods
    cooling rate
    secondary dendrite arms spacing
    gamma prime evaluation
    carbide evaluation
    heat treatment
    superstopy na bazie niklu
    obróbka cieplna
    rozstaw ramion dendrytu
    rozmiar węglików
    rozkład węglików
    metody metalografii ilościowej
    Opis:
    The Ni – base superalloys are used in aircraft industry for production of aero engine most stressed parts, as are turbine blades or turbine discs. The most stressing factor at Ni – base superalloys loading or working conditions are high temperature range of 700°C up to 850°C and, of course, centrifugal forces, and small vibrations, which produce bending of turbine blades inserted into turbine discs. All these factors cause various forms of microstructure degradation closely connected with decreasing of mechanical properties and shortening of working life as well. From this reason a dendrite arm spacing, carbides size and distribution, morphology, number and value of γ’ - phase are very important structural characteristics for blade lifetime prediction as well as aero engine its self. In this article are used methods of quantitative metallography for evaluation of structural characteristics mentioned above on experimental materials – Ni base superalloys ŽS6K and Inconel IN 738. The high temperature effect represented here by heat treatment at 800°C for 10 hours, and cooling rate, here represented by three various cooling mediums as water, air, and oil, on structural characteristics and application of quantitative methods evaluation with using of SEM are presented in this paper.
    Źródło:
    Zeszyty Naukowe. Quality. Production. Improvement; 2017, 1 (6); 20-30
    2544-2813
    Pojawia się w:
    Zeszyty Naukowe. Quality. Production. Improvement
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the precipitation hardening process in recycled Al-Si-Cu cast alloys
    Autorzy:
    Kuchariková, L.
    Tillová, E.
    Matvija, M.
    Belan, J.
    Chalupová, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/354012.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    precipitation hardening
    recycled Al-Si-Cu cast alloys
    Cu precipitate
    mechanical properties
    transmission electron microscopy
    Opis:
    The formation of extremely small uniformly dispersed particles of a second phase within the original phase matrix during heat treatment changed material properties. Therefore the characterization of precipitation had been investigated using high resolution transmission electron microscopy (TEM) and electron diffraction of thin foils for an AlSi9Cu3 cast alloy. For investigation the hardening effect onto mechanical properties of aluminium cast was used heat treatment, which consisted from solution treatment at 515°C / 4 hours (h), followed by quenching into water with temperature 50°C and artificial aging using different temperatures 170°C and 190°C with different holding time 2, 4, 8, 16, and 32 hours. The observations of microstructure and substructure reveals that precipitation hardening has caused great changes in size, morphology and distributions of structural components, the formation of precipitates of Cu phases, and the change of mechanical properties as well.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 1; 397-403
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Bending Fatigue Properties of Al-Si Cast Alloy
    Autorzy:
    Tillová, E.
    Závodská, D.
    Kuchariková, L.
    Chalupová, M.
    Belan, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/355910.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    secondary Al-Si cast alloy
    fatigue properties
    fracture
    cast defects
    Opis:
    Fatigue properties of casting Al-alloys are very sensitive to the microstructural features of the alloy (e.g. size and morphology of the eutectic Si, secondary dendrite arm spacing – SDAS, intermetallics, grain size) and casting defects (porosity and oxides). Experimental study of bending fatigue properties of secondary cast alloys have shown that: fatigue tests up to 106-107cycles show mean fatigue limits of approx. 30-49 MPa (AlSi9Cu3 alloy – as cast state), approx. 65-76 MPa (AlSi9Cu3 alloy after solution treatment) and 60-70 MPa (self-hardened AlZn10Si8Mg alloy) in the tested casting condition; whenever large pore is present at or near the specimen’s surface, it will be the dominant cause of fatigue crack initiation; in the absence of large casting defects, the influence of microstructural features (Si morphology; Fe-rich phases) on the fatigue performance becomes more pronounced.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1591-1596
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Employing various metallography methods at high temperature alloy fatigue tests evaluation
    Autorzy:
    Belan, J.
    Kucharikova, L.
    Vasko, A.
    Chalupova, M.
    Svecova, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/111897.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    Ni-base casting and wrought alloys
    gamma prime
    gamma double prime
    gamma solid solution
    light microscopy
    scanning electron microscopy
    SEM
    skaningowa mikroskopia elektronowa
    stopy do obróbki plastycznej
    mikrostruktury nadstopów
    stop
    odlew
    Opis:
    Microstructures of superalloys have dramatically changed throughout the years, as modern technology of its casting or forging has become more sophisticated. The first superalloys have polyedric microstructure consisting of gamma solid solution, some fraction of gamma prime and of course grain boundaries. As demands on higher performance of aero jet engine increases, the changes in superalloys micro-structure become more significant. A further step in microstructure evolution was directionally solidified alloys with columnar gamma prime particles. The latest microstructures are mostly monocrystalline, oriented in [001] direction of FCC gamma matrix. All microstructure changes bring necessity of proper preparation and evaluation of microstructure. Except for the already mentioned structures have gamma double prime and various carbides form can be seen. These structural parameters have mainly positive influence on important mechanical properties of superalloys. The paper deals with a microstructural evaluation of both groups of alloys – cast and as well as wrought. Micro-structure evaluation helps to describe mechanism at various loading and failure of progressive superalloys. Such an example where micro-structure evaluation is employed is fractography of failure surfaces after fatigue tests, which are examples of metallography evaluation de-scribed in this paper as a secondary objective.
    Źródło:
    Production Engineering Archives; 2016, 13, 4; 11-15
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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