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    Wyświetlanie 1-10 z 10
    Tytuł:
    Substantially Higher Corrosion Resistance in AE42 Magnesium Alloy through Corrosion Layer Stabilization by ECAP Treatment
    Autorzy:
    Minárik, P.
    Král, R.
    Hadzima, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419053.pdf
    Data publikacji:
    2012-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.-t
    82.45.Bb
    Opis:
    The corrosion properties of magnesium alloy AE42, just extruded and with posterior eight passes through equal channel angular pressing after extrusion, were investigated in 0.1 M NaCl by electrochemical impedance spectroscopy. The obtained samples were compared using scanning electron microscopy micrographs of the corrosion layers created on the surface of the specimens. The background of the substantial higher corrosion resistance of the samples after equal channel angular pressing treatment was found to be the much thicker and stable corrosion layer and smaller separating fragments in comparison with the just extruded samples. The lowering of the grain size by severe plastic deformation, especially by the equal channel angular pressing treatment was found to be also responsible for the enhancement of the corrosion resistance in AE42 class of magnesium alloys.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 3; 614-617
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of welding time on quality of the friction welded joint of two dissimilar steels
    Autorzy:
    Ratković, N.
    Lazić, V.
    Arsić, D.
    Nikolić, R.
    Hadzima, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/114836.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    friction welding
    joint quality
    welding time
    friction time
    compacting time
    spawanie tarciowe
    jakość połączenia
    czas spawania
    czas tarcia
    Opis:
    There are several factors that influence the friction welding (FW) process, i.e. the quality of the welded joint, like the welding time, the contact pressure, the compacting pressure, the friction speed etc. The joining process is additionally complicated if the two different materials are to be welded to each other. The subject of research, presented in this paper, is the welding time of the FW process, since the level of axial and radial plastic deformation of the welded pieces and shortening of the welded part depend mainly on the welding time. The paper first presents some theoretical basics of the FW process and then, in the experimental part, the influence of the process duration is investigated. The two materials that the experimental samples were made of are the high-speed steel and the steel for tempering.
    Źródło:
    Zeszyty Naukowe. Quality. Production. Improvement; 2017, 1 (6); 1-11
    2544-2813
    Pojawia się w:
    Zeszyty Naukowe. Quality. Production. Improvement
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anisotropic Magnetic Properties of MilledBearing Steel Surface
    Autorzy:
    Mičica, M.
    Blažek, D.
    Hadzima, B.
    Pištora, J.
    Neslušan, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1192261.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Bb
    75.60.Ej
    78.20.Ls
    Opis:
    For many reasons, the steel surfaces are machined to obtain required physical properties. Suitable methods are required for the management and control of the manufacturing processes, which are simultaneously sufficiently robust and sensitive. The non-destructive testing methods, sensitive to the magnetic properties of the surface, are very suitable for this purpose. The Barkhausen noise (BN) measurement, which reveals the discontinuous movement of the magnetic domains in the thin surface layer during magnetisation reversal process is very robust, while magneto-optical Kerr effect (MOKE) method, using polarized light for orientation measurements of magnetic domains at the surface, is very sensitive and provides detailed information about hysteresis curves (HC) of the materials. In this contribution our results obtained on the milled 100Cr6 bearing steel are presented. These properties were obtained by MOKE laboratory measurements and bring very interesting facts about the magnetisation reversal process, which depends on the orientation of the magnetic field with respect to the cutting direction. Our results clarify the strong anisotropy of BN, which is observed during the industrial application of this method.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1421-1423
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evolution of Corrosion Resistance in the LAE442 Magnesium Alloy Processed by ECAP
    Autorzy:
    Minárik, P.
    Král, R.
    Janeček, M.
    Chmelík, F.
    Hadzima, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402153.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.-t
    82.45.Bb
    Opis:
    The influence of processing by equal channel angular pressing on the corrosion resistance was investigated in the extruded LAE442 magnesium alloy by the linear polarization method. Continuous increase of the corrosion resistance with the increasing number of passes was measured. The polarization resistance of the 12P sample was substantially higher as compared to the extruded state. The results were discussed in terms of the corrosion layers formed on the surface after seven days of immersion. It was concluded that the substantial increase of polarization resistance was caused by the combined effect of grain refinement and aluminum and lithium oxides formation within the corrosion layer.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 772-774
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Revitalization of the damaged machine parts by hard facing as a way of saving funds
    Autorzy:
    Lazic, V.
    Arsic, D.
    Nikolic, R.
    Mutavzic, M.
    Hadzima, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/111734.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    revitalization technology
    hard facing
    costs
    savings
    profitability
    loader's bucket teeth
    technologia rewitalizacji
    napawanie
    rentowność
    ładowarka
    Opis:
    The objective of the research, presented in this paper, was to demonstrate the superiority of the hard facing as the revitalization technology of various damaged machine parts. The analysis of the two different revitalization methods of the damaged machine parts is presented – the replacement of the damaged part by the new – spare part and reparation by hard facing. The comparison is done on the example of hard facing and replacing of damaged loader's teeth. The paper presents a method for calculating costs of the two revitalization technologies based on their profitability and their comparison. That method could be applied for similar calculations for any machine part, with smallest or no adjustments. The paper presents a verification of advantage of applying the hard facing as the machine parts reparatory technology with respect to the other revitalization technology. The savings realized by application of hard facing reparation of the loader's teeth reach 73.5 % for one set of teeth and 82.40per annum of the costs for purchasing the new spare parts. The analysis was conducted under an assumption that organization of the maintenance function is at the exceptionally high level so that the purchasing of the new part/repairing of the damaged one is always done in time. This idealized approach was adopted since in that way one obtains the least economic effects of the reparatory technology application with respect to replacing the part with the spare one. In any other case the economic effects would be significantly higher, namely even more positive in favor of the hard facing revitalization technology.
    Źródło:
    Production Engineering Archives; 2016, 12, 3; 9-13
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The fatigue life estimate by the LEFM concept of the tube joints exposed to axial load
    Autorzy:
    Djoković, J. M.
    Nikolić, R. R.
    Bujňák, J.
    Hadzima, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/131470.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Komisja Inżynierii Budowlanej PAN Oddział w Katowicach
    Tematy:
    tube joints
    fatigue life
    LEFM
    Paris' law
    złącza rurowe
    trwałość zmęczeniowa
    prawo paryskie
    Opis:
    In the tube joints the crack growth usually appears along the weld’s edge, i.e. at the spot where the chord and the brace are connected. The semi-elliptical crack the most frequently develops from the initial flaw that originated during the welding. The abrupt change in the material’s structure and response to loading are increasing the normal stresses in the lateral tube at certain spots around the crossing of the main and lateral tubes, producing the “hot spot” stress. Sensitivity to fatigue depends on combination of the cyclic loading, initial defects, environmental influences and the “hot spot” stresses which are the result of the tube walls bending during the loading of the structure. The principles of the Linear Elastic Fracture Mechanics (LEFM) are applied in this paper to analysis of the crack propagation behavior of a thin tube joints. Influence of various parameters was investigated individually and independently, and the share of the fatigue crack growth and subsequently the working life of the welded joint were estimated.
    Źródło:
    Roczniki Inżynierii Budowlanej; 2017, 17; 35-41
    1505-8425
    Pojawia się w:
    Roczniki Inżynierii Budowlanej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure of 22Cr25NiWCoCu Austenitic Stainless Steel After Ageing
    Autorzy:
    Sroka, Marek
    Zieliński, A.
    Puszczało, T.
    Sówka, K.
    Hadzima, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2048810.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    22Cr25NiWCoCu steel
    microstructure
    precipitates
    ageing
    Opis:
    The 22Cr25NiWCoCu austenitic stainless steel was developed by AB Sandvik Material Technology in Sweden. Due to its high creep strength and good corrosion resistance, this material is well suited for use in superheaters in advanced coal-fired power boilers as well as in other types of steam boilers using various types of fuel. The examined material was subject to long-term ageing for the time of annealing up to 20 000 h at 700 and 750°C. Precipitation processes and microstructure stability as-received and after ageing were investigated. Examination of the microstructure was conducted using scanning electron microscopy. The identification of secondary phases was carried out by X-ray phase composition. Using the results of the investigations of precipitation processes in the microstructure, both within the grains and at the grain boundaries, their statistical analysis was carried out. To illustrate this impact, the following parameters were used: surface area and equivalent diameter of precipitates. Based on the surface area measurements, the percentage of the phase in the reviewed photo’s total area was calculated.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 1; 175-180
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Microstructure on the Corrosion Resistance of the AE42 Magnesium Alloy Processed by Rotary Swaging
    Autorzy:
    Minárik, P.
    Zemková, M.
    Král, R.
    Mhaede, M.
    Wagner, L.
    Hadzima, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402163.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.-t
    82.45.Bb
    Opis:
    Microstructure and corrosion resistance of the AE42 commercial alloy processed by extrusion and rotary swaging were investigated. Microstructure characterization showed an increasing volume fraction of the refined grains with increasing stage of swaging processing. However, their presence was limited solely to the peripheral ring of ≈1 mm in all studied conditions of swaged material. Corrosion resistance investigation showed continuous decrease of polarization resistance that was attributed to the grain refinement and insufficient homogenization of the alloying elements during the swaging process.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 805-807
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of load and reinforcement content on selected tribological properties of Al/SiC/Gr hybrid composites
    Autorzy:
    Veličković, S.
    Miladinović, S.
    Stojanović, B.
    Nikolić, R. R.
    Hadzima, B.
    Arsić, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/111714.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    aluminum alloy
    hybrid composites
    silicon carbide
    graphite
    particles
    stop aluminium
    węglik krzemu
    grafit
    kompozyty hybrydowe
    Opis:
    Hybrid materials with the metal matrix are important engineering materials due to their outstanding mechanical and tribological properties. Here are presented selected tribological properties of the hybrid composites with the matrix made of aluminum alloy and reinforced by the silicon carbide and graphite particles. The tribological characteristics of such materials are superior to characteristics of the matrix – the aluminum alloy, as well as to characteristics of the classical metal-matrix composites with a single reinforcing material. Those characteristics depend on the volume fractions of the reinforcing components, sizes of the reinforcing particles, as well as on the fabrication process of the hybrid composites. The considered tribological characteristics are the friction coefficient and the wear rate as functions of the load levels and the volume fractions of the graphite and the SiC particles. The wear rate increases with increase of the load and the Gr particles content and with reduction of the SiC particles content. The friction coefficient increases with the load, as well as with the SiC particles content increase.
    Źródło:
    Production Engineering Archives; 2018, 18; 18-23
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interrelation of Microstructure and Corrosion Resistance in Biodegradable Magnesium Alloys with Aluminum, Lithium and Rare Earth Additions
    Autorzy:
    Minárik, P.
    Landa, M.
    Lesná, I.
    Zemková, M.
    Jablonská, E.
    Hadzima, B.
    Janeček, M.
    Král, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402061.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.-t
    82.45.Bb
    87.85.J-
    43.40.Le
    Opis:
    The influence of equal channel angular pressing and rotary swaging on the microstructure and corrosion resistance was investigated in three magnesium alloys with the addition of aluminum, lithium and rare earth elements - AE21, AE42 and LAE442. The processing resulted in grain refinement in all cases; nevertheless, the effect on the corrosion resistance was ambiguous. A continuous increase of the polarization resistance during the gradual equal channel angular pressing was observed in the AE42 and LAE442 alloys, whereas there was almost no effect in the AE21 alloy. The rotary swaging of AE42 resulted in a decrease of polarization resistance. The increase of polarization resistance in the alloys with the higher concentration of alloying elements was caused by the combined effect of grain refinement and better dispersion of particles in the matrix thanks to shear deformation during equal channel angular pressing. In the AE42 alloy, the increase of the corrosion resistance after equal channel angular pressing was also proven by chemical analysis of the solution and acoustic emission detection. This beneficial effect was not observed when the concentration of alloying elements was lower or when the deformation mode was different from shearing.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 491-496
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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