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    Wyświetlanie 1-8 z 8
    Tytuł:
    Changes in hardness of magnesium alloys due to precipitation hardening
    Autorzy:
    Oršulová, T.
    Palček, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/111838.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    magnesium alloy
    precipitation
    changes in hardness
    heat treatment
    stopy magnezu
    utwardzanie wydzieleniowe
    obróbka cieplna
    pomiar twardości
    Opis:
    This paper deals with the evaluation of changes in hardness of magnesium alloys during precipitation hardening that are nowadays widely used in different fields of industry. It focuses exactly on AZ31, AZ61 and AZ91 alloys. Observing material hardness changes serves as an effective tool for determining precipitation hardening parameters, such as temperature and time. Brinell hardness measurement was chosen based on experimental needs. There was also necessary to make chemical composition analysis and to observe the microstructures of tested materials. The obtained results are presented and discussed in this paper.
    Źródło:
    Production Engineering Archives; 2018, 18; 46-49
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of cyclic loading on the internal damping of magnesium alloy AZ31
    Autorzy:
    Uhricik, M.
    Dresslerova, Z.
    Palcek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/111710.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    magnesium alloy
    resonant frequency
    internal damping
    cyclic loading
    stop magnezu
    częstotliwość rezonansowa
    tłumienie wewnętrzne
    cykliczne ładowanie
    Opis:
    The article focuses on the analysis of the internal damping changes depending on the amplitude of the magnesium alloy AZ31. Internal damping reflects the ability of the material irreversibly dissipating mechanical energy oscillations. It means that the material of high internal damping ability is able to significantly reduce the vibration amplitude. Internal damping is, generally, dependent on many factors (temperature, material purity, grain size, mechanical and thermal processing, etc.) and its value is determined by interactions between various mechanisms dissipation of mechanical energy. Ultrasonic resonance method was used in experimental measurements, which is based on continuous excitation of oscillations of the specimen, and the entire apparatus vibrates at a frequency which is near to the resonance. Starting resonance frequency for all measurements was about f = 20470 Hz.
    Źródło:
    Production Engineering Archives; 2017, 15; 7-10
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of plastic deformation on the magnetic properties of selected austenitic stainless steels
    Autorzy:
    Orsulova, T.
    Palcek, P.
    Kudelcik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/112078.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    plastic deformation
    austenite
    stainless steel
    magnetic properties
    odkształcenia plastyczne
    austenit
    stal nierdzewna
    właściwości magnetyczne
    Opis:
    Austenitic stainless steels are materials, that are widely used in various fields of industry, architecture and biomedicine. Their specific composition of alloying elements has got influence on their deformation behavior. The main goal of this study was evaluation of magnetic properties of selected steels, caused by plastic deformation. The samples were heat treated in different intervals of temperature before measuring. Then the magnetic properties were measured on device designed for measuring of magnetism. From tested specimens, only AISI 304 confirmed effect of plastic deformation on the magnetic properties. Magnetic properties changed with increasing temperature.
    Źródło:
    Production Engineering Archives; 2017, 14; 15-18
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Change of internal friction on aluminium alloy EN AC 51200 depending on temperature
    Autorzy:
    Uhricik, M.
    Dresslerova, Z.
    Soviarova, A.
    Palcek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/111941.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    aluminium alloy
    resonant frequency
    internal friction
    temperature
    stop aluminium
    częstotliwość rezonansowa
    częstotliwość rezonansowatarcie wewnętrzne
    temperatura
    Opis:
    The article is focused on the analysis of changes in the dependence on temperature on the aluminium alloy EN AC 51200 (10,1% Mg, 1,32% Si and 0,43% Mn) by internal friction. Internal friction is a property of the material measured on the ultrasonic resonant apparatus at a frequency of about f = 20470 Hz. The measured temperature range was from 50 °C up to 420 °C. The precise measurement of the internal friction can be monitored on an ongoing process by structural changes and various mechanisms that prevent these changes.
    Źródło:
    Production Engineering Archives; 2015, 6, 1; 17-20
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the Properties of EN AC 51200 Aluminum Alloy
    Autorzy:
    Uhríčik, M.
    Palček, P.
    Chalupová, M.
    Hanusová, P.
    Kuchariková, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/356674.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum alloy
    Al-Mg cast alloy
    three-point bending loading
    fatigue
    fracture surface
    Opis:
    The article will be focused on analysis of properties of aluminum alloy for the casting of type Al-Mg. As an experimental material was used aluminum alloy EN AC 51200, supplied in a cast state without a heat treatment. It was produced by the continuous casting method. Experiments deal with microstructural material analysis, fractographic analysis, mechanical and fatigue tests. The microstructure of the testing sample was examined using an optical microscope Neophot 32. Fatigue properties of aluminum alloy was tested by three-point bending cyclic loading. The fracture surface of the testing sample was examined using scanning electron microscopy (SEM), where sample was observed on various stages of the fatigue process, its characteristics and differences of fracture surfaces.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 4; 1437-1445
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of welded joint quality on safety and reliability in operation
    Autorzy:
    Bokuvka, O.
    Liptakova, T.
    Palcek, P.
    Chalupova, M.
    Trsko, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/111736.pdf
    Data publikacji:
    2013
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    rails
    pipes
    welded joint
    defects
    fractures
    causes
    szyny
    rury
    złącza spawane
    wady
    pęknięcia
    przyczyny
    Opis:
    The quality of welded joint is an assumption of long-term reliability in operation. On the contrary, defective work of bad quality welded joint leads to fracture and crashes of plants. In this paper the authors state that experimentally obtained causes of rails and pipes fractures were the result of bad realization of welded joint. Pores, blowholes, slags, lack of fusion, non-plastic non-metallic particles, cracks, shrink holes were the defects observed in the welded joint area. These defects substantially decreased the load-bearing cross section and the final result was fracture. The railway and high-pressure gas lines out of operation are undesirable and accompanied by considerable financial losses.
    Źródło:
    Production Engineering Archives; 2013, 1, 1; 6-9
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of the Structure on the Fatigue Properties of Al-Mg Cast Alloy
    Autorzy:
    Uhríčik, M.
    Palček, P.
    Chalupová, M.
    Oravcová, M.
    Frkáň, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/352607.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Mg cast alloy
    three-point bending loading
    fatigue property
    fracture surface
    structure
    Opis:
    The article will be focused on monitoring the influence of the structure on the fatigue properties of aluminium alloys for the casting of type Al-Mg. As an experimental material were used aluminium alloys EN AC 51200 and EN AC 51500, supplied in a cast state without a heat treatment. They were produced by the continuous casting method. These alloys were selected on the basis of the chemical composition, where the content of most alloying elements is comparable, only in the case of the concentration of magnesium are these alloys significantly different. Fatigue properties of aluminium alloys were tested by three-point bending cyclic loading. The fracture surface of the testing sample was examined using scanning electron microscopy (SEM), where samples were observed on various stages of the fatigue process, their characteristics and differences of fracture surfaces.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1615-1624
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superplastic Behaviour of an Extruded AZ91 Alloy
    Autorzy:
    Trojanová, Z.
    Turba, K.
    Száraz, Z.
    Ryspaev, T.
    Palček, P.
    Chalupová, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419006.pdf
    Data publikacji:
    2012-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    62.20.fq
    Opis:
    Plastic deformation of extruded AZ91 magnesium alloy was investigated at various strain rates and in a temperature range of 360-420°C. Samples exhibiting superplastic behaviour were prepared with different thermo-mechanical treatments. Microstructure of samples was observed by light and scanning electron microscopy. The strain rate sensitivity parameter m has been estimated by the abrupt strain rate change method. Possible physical mechanisms of the superplastic flow are discussed.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 3; 597-600
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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