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    Tytuł:
    Fatigue characteristics of materials used in transport industry applications
    Autorzy:
    Belan, Juraj
    Kuchariková, Lenka
    Mazur, Magdalena
    Tillová, Eva
    Chalupová, Mária
    Powiązania:
    https://bibliotekanauki.pl/articles/88678.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    fatigue properties
    Inconel alloy
    aluminum alloy
    fatigue fracture
    transportation safety
    właściwości zmęczeniowe
    stop Inconel
    stop aluminium
    pęknięcie zmęczeniowe
    próba zmęczeniowa
    bezpieczeństwo transportu
    Opis:
    Designers have a major interest about fatigue properties of materials used in transport industry. Each component in transport works under alternating stress. From this point of view the fatigue properties are important for single parts lifetime resulting into safety of whole components as cars and airplanes what leads to safety on the roads or air and have influence on human life as well. Therefore this paper deals with fatigue properties of wrought Inconel alloy IN 718 and aluminum cast alloy AlSi9Cu3. Both materials were put on fatigue push – pull test, but Ni – based IN 718 alloy at frequency of loading around 20 000 kHz (High Frequency High Cycles Fatigue) and aluminum alloy AlSi9Cu3 at frequency of loading around 80 Hz (Low Frequency High Cycles Fatigue). These parameters were chosen with respect of usage such materials for production of components used in transport industry applications. Results after fatigue tests are presented as Wohler curve. For prediction of source of fracture the SEM fractography analysis of fatigue fracture surfaces was made.
    Źródło:
    System Safety : Human - Technical Facility - Environment; 2019, 1, 1; 810-818
    2657-5450
    Pojawia się w:
    System Safety : Human - Technical Facility - Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Structural Parameters - the Shape of Graphite and Matrix on Change of Ultrasonic Wave Propagation Rate and Value of Attenuation in Graphitic Cast Irons
    Autorzy:
    Belan, Juraj
    Tillová, Eva
    Uhríčik, Milan
    Pastierovičová, Lucia
    Powiązania:
    https://bibliotekanauki.pl/articles/26081550.pdf
    Data publikacji:
    2023
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    badanie ultradźwiękowe
    zapewnienie jakości żeliwa
    grafitowy kształt
    współczynnik perlitu i ferrytu
    ultrasonic investigation
    quality assurance of cast iron
    graphite shape
    pearlite and ferrite ratio
    quantitative evaluation of graphite and matrix
    Opis:
    Despite the tendency of the current industry, especially the automotive industry, it is to use modern, light and super-strong materials based on Al or HSLA steels, the application of classic materials such as cast iron still makes sense, especially concerning price and excellent castability. The article presents one of the possible ways of using the ultrasonic non-destructive method in quality control and simpli-fication of the identification of the type of cast iron concerning the change of parameters of ultrasound propagation in materials. The main criteria for assessing the quality and determining the type of graphite cast iron were considered to be the rate of propagation of ultrasound - cL and the value of attenuation , which vary depending on the shape of the graphite and matrix. Graphitic cast irons with different graphite shapes (lamellar, vermicular, and globular shapes) and a matrix with different ferrite/perlite ratios were used as experimental material. Along with the ultrasonic tests, a metallographic analysis was also performed to quantify the microstructure of cast irons.
    Źródło:
    Production Engineering Archives; 2023, 29, 1; 23--27
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The quality assurance of cast and wrought aero jet engine components made from Ni-base superalloys with using of quantitative metallography methods and alloys lifetime prediction
    Autorzy:
    Belan, Juraj
    Kuchariková, Lenka
    Mazur, Magdalena
    Tillová, Eva
    Hanusová, Patrícia
    Powiązania:
    https://bibliotekanauki.pl/articles/104037.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    quality assurance
    cast Ni-base superalloys
    wrought Ni-base superalloys
    turbine blades
    turbine disc
    quantitative metallography
    zapewnienie jakości
    superstopy na bazie Ni
    łopatki turbin
    tarcza turbiny
    metalografia ilościowa
    Opis:
    The Ni-base superalloys are used in the aircraft industry for the production of aero engine most stressed parts, turbine blades or turbine discs. Quality of aero jet engine components has a significant influence on the overall lifetime of a jet engine as itself as well as the whole airplane. From this reason a dendrite arm spacing, grain size, morphology, number and value of γ' - phase are very important structural characteristics for blade or discs lifetime prediction. The methods of quantitative metallography are very often used for evaluation of structural characteristics mentioned above. The high-temperature effect on structural characteristics and application of quantitative methods evaluation are presented in this paper. The two different groups of Ni-base alloys have been used as experimental material: cast alloys ZhS6K and IN713LC, which are used for small turbine blades production and wrought alloys EI 698VD and EI 929, which are used for turbine disc production. Selected alloys have been evaluated in the starting stage and after applied heattreatment at 850°C for 24 hrs. This applied heat-treatment causes structural changes in all alloys groups. In cast alloy dendritic structure is degraded and gamma prime average size has grown what has a negative influence on turbine blade creep rupture life. Wrought alloys show partially grain boundary melting and grain size changed due to recrystallization what causes mechanical properties decreasing - ultimate tensile strength mainly.
    Źródło:
    Quality Production Improvement - QPI; 2019, 1, 1; 222-229
    2657-8603
    Pojawia się w:
    Quality Production Improvement - QPI
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence on the quality of secondary aluminum alloy casts by Mn addition
    Autorzy:
    Kuchariková, Lenka
    Tillová, Eva
    Mazur, Magdalena
    Herčko, Adrián
    Powiązania:
    https://bibliotekanauki.pl/articles/104160.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    intermetallic phases
    addition of Mn
    secondary aluminium alloys
    quality of cast
    wtórne stopy aluminium
    fazy międzymetaliczne
    dodatek Mn
    jakość odlewów
    Opis:
    The quality of aluminum casts is necessary in order to reach sufficient properties required for application. The decreasing in the properties of aluminum cast mainly related with microstructure, especially with size and morphology of second phases. One of such second phases in aluminum alloys are the β-phases. These phases are unwonted mainly because of the decreasing of mechanical properties. The contribution is deal with influence of addition of Mn to affecting the formation of βphases in the AlSi7Mg0.3 and AlSi7Mg0.6 cast alloys. These materials are used for application especially automotive industry. The results shows, that addition of Mn is not sufficient for affecting of formation of the Fe-rich phases in AlSi7Mg0.6 cat alloys, but in the AlSi7Mg0.3 this addition lead to changes in formation of Fe-rich intermetallic phases.
    Źródło:
    Quality Production Improvement - QPI; 2019, 1, 1; 319-325
    2657-8603
    Pojawia się w:
    Quality Production Improvement - QPI
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Self-Hardening AlZn10Si8Mg Cast Alloy for the Automotive Industry
    Autorzy:
    Kuchariková, Lenka
    Pastierovičová, Lucia
    Tillová, Eva
    Chalupová, Mária
    Závodská, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/27313862.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    self-hardening alloy
    mechanical properties
    fatigue
    deep-etching
    aluminium alloy
    Opis:
    Self-hardening aluminium alloys represent a new and interesting group of aluminium alloys. They have the advantage that they do not need to be heat treated, which is an important advantage that contributes to a significant reduction in production costs of some components and in the amount of energy used. The present paper deals with the possibility to replace the most used heat treatable AlSi7Mg0.3 cast alloys with a self-hardened AlZn10Si8Mg cast alloy. In this study, microstructural characterization of tensile and fatigue-tested samples has been performed to reveal if this replacement is possible. The results of fatigue tests show that AlSi7Mg0.3 alloy after T6 heat treatment and self-hardened AlZn10Si8Mg has comparable values of fatigue properties. The self-hardening alloy has slightly lower strength, ductility, and hardness.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 2; 517--524
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Iron impact on the quality of sand casting made from secondary AlSi7Mg0.6 alloy used in the automotive and aerospace industry
    Autorzy:
    Pastierovičová, Lucia
    Kuchariková, Lenka
    Tillová, Eva
    Chalupová, Mária
    Powiązania:
    https://bibliotekanauki.pl/articles/24202595.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    casting quality
    secondary aluminum
    aluminum alloys
    Fe content
    porosity
    automotive
    Opis:
    Due to the high demand for secondary alloys in the automotive and aerospace industry, this work investigates the effect of higher iron content on the quality of AlSi7Mg0.6 sand castings. Secondary-recycled Al-Si alloys contain an increased amount of impurities due to their remelting of scrap metal. One of the most unwanted impurities found in these alloys is iron. Iron leads to the formation of various Fe-rich intermetallic phases, whose morphology influences the mechanical properties even at low Fe content. It also promotes the formation of casting defects, such as porosity and shrinkage. The formation of porosity in secondary Al-alloys is another major aspect that can affect the final properties of castings. Since these materials are mainly used to produce castings for the automotive industry, such as engine blocks, cylinder heads, and so on, it is necessary to produce castings without any defects. Therefore, the quality of AlSi7Mg0.6 sand casting is investigated at lower iron content (0.128% wt. Fe) and compared to the higher iron content (0.429% wt. Fe), whereby a correlation between iron content and porosity is monitored.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2022, 72 (144); 86--91
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quality of automotive sand casting with different wall thickness from progressive secondary alloy
    Autorzy:
    Pastierovičová, Lucia
    Kuchariková, Lenka
    Tillová, Eva
    Chalupová, Mária
    Pastirčák, Richard
    Powiązania:
    https://bibliotekanauki.pl/articles/26078793.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    jakość odlewów
    wtórny stop aluminium
    grubość ściany
    analiza ilościowa
    wyższa zawartość Fe
    quality of castings
    secondary aluminium alloy
    wall thickness
    quantitative analysis
    higher Fe content
    Opis:
    This paperwork is focused on the quality of AlSi6Cu4 casting with different wall thicknesses cast into the metal mold. Investigated are structural changes (the morphology, size, and distribution of structural components). The quantitative analysis is used to numerically evaluate the size and area fraction of structural parameters (α-phase, eutectic Si, intermetallic phases) between delivered experimental material and cast with different wall thicknesses. Additionally, the Brinell hardness is performed to obtain the mechanical property benefits of the thin-walled alloys. This research leads to the conclusion, that the AlSi6Cu4 alloy from metal mold has finer structural components, especially in small wall thicknesses, and thus has better mechanical properties (Brinell hardness). These secondary Al-castings have a high potential for use in the automotive industry, due to the thin thicknesses and thus lightweight of the construction.
    Źródło:
    Production Engineering Archives; 2022, 28, 2; 172--177
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improving the quality of Al-Si castings by using ceramic filters
    Autorzy:
    Švecová, Ivana
    Tillová, Eva
    Kuchariková, Lenka
    Powiązania:
    https://bibliotekanauki.pl/articles/111619.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    aluminium alloy
    ceramic filters
    hardness
    porosity
    stop aluminium
    filtr ceramiczny
    odlew aluminiowy
    jakość odlewów
    twardość
    porowatość
    Opis:
    The use of cast aluminium has still increased, so have the mechanical property requirements. By casting and also in other metallurgical processes, the inclusions enter to the molten aluminium alloy and it exhibits poor ductility or toughness. It can cause a variety of problems in the manufacture of aluminium alloy castings. Therefore, the purification of the molten aluminium alloy is one of the most important processes for improving the quality of Al-products. Filters have been used for many years in order to improve the quality of castings. The inclusions in molten secondary AlSi7Mg0.3 cast were removed using depth filtration by ceramic foam filters of 20 ppi porosity. Were used 4 types of ceramic filters in 2 thicknesses (15 and 22 mm); Brinell hardness and porosity were measured. Quality of microstructure (occurrence of oxidic particles and larger non-metallic inclusions) was observed. Experimental results show that the insertion of ceramic filters into the inlet system has contributed primarily to a decrease in porosity. On the microstructure, the inclusion of filters was not significantly reflected.
    Źródło:
    Production Engineering Archives; 2020, 26; 19-24
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Advantages of colour etching in quality control of recycled Al-Si cast alloys
    Autorzy:
    Tillová, Eva
    Kuchariková, Lenka
    Chalupová, Mária
    Belan, Juraj
    Vaško, Alan
    Herčko, Adrián
    Powiązania:
    https://bibliotekanauki.pl/articles/104005.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    Al-Si cast alloys
    colour metallography
    microstructure
    quality control
    stopy odlewane Al-Si
    mikrostruktura
    kontrola jakości
    metalografia kolorowa
    Opis:
    Colour Metallography is a set of light metallographic microscopy methodologies that utilize phase colour contrast as a source of new structure information compared to conventional techniques. In many cases, colour contrast can be induced where no identifiable phase contrast is obtained by conventional techniques. With the help of colour contrast, we gain new information on the structure of Al-Si alloys, especially intermetallic phases, in which the benefits of its use in casting quality control are of benefit. Blue-yellow contrast is definitely more pronounced than dark grey or light grey contrast. There is no substantial reproducible colour reproduction, since it is irrelevant whether the two phases are distinguished by blue-yellow or green-ocher contrast. When using the colour contrast, the structural components differ not only according to their microscopic appearance, but also based on the knowledge of the chemical composition of alloys, interactions between structural components, knowledge of the possible influence of Al-alloys structure (e.g. refining, modifications, heat treatment). Colour contrast in quality control of Al-Si alloys was applied to AlSiMg cast alloy (AlSi7Mg0.3; AlSi7MgTi; AlSi10MgMn; etc.).
    Źródło:
    Quality Production Improvement - QPI; 2019, 1, 1; 296-303
    2657-8603
    Pojawia się w:
    Quality Production Improvement - QPI
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Si morphology in AlSi21CuNiMg cast alloy using col our and deep etching
    Autorzy:
    Tillová, Eva
    Chalupová, Mária
    Kuchariková, Lenka
    Bonek, Mirosław
    Uhríčik, Milan
    Pastierovičová, Lucia
    Powiązania:
    https://bibliotekanauki.pl/articles/2204522.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Si cast alloy
    primary silicon
    deep etching
    morphology
    krzem pierwotny
    głębokie trawienie
    morfologia
    odlewnicze stopy Al-Si
    silumin
    odlewniczy stop aluminium z krzemem
    alpaks
    odlewnicze stopy aluminium Al-Si
    Opis:
    The effect of possible modification and refining effect of Al-Cu-P-based pre-alloy combined with Fe on the microstructure and the silicon morphology change in hypereutectic Al-Si cast alloy was studied. The samples in the as-cast state were observed by optical and scanning electron microscopy with energy-dispersive X-ray spectroscopy. The 3D morphology of both primary and eutectic silicon was observed by using colour and deep etching in detail. The results showed that the AlCu19P1.4 pre-alloy (1.07 wt.%) combined with the addition of Fe (0.02 wt.%) has a significant effect on the change of the amount, size and morphology of primary Si. This is significantly refined and changes the shape from a coarse irregular star-shaped, polyhedral, or plate-like shape to a fine polyhedral shape. The average size of the primary Si is reduced by about of 78 % from 135 μm to 28 μm and the number of primary Si particles increased from 7.4 to 237. No change in the morphology of the eutectic Si was observed; a refinement of the structure from a coarse needle/plate-like to a fine plate-like structure was seen. The depth etching method using HCl was very effective in the study of the 3D silicon morphology observed, which could be observed in detail without the presence of artefacts.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 2; art. no. e144618
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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