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    Wyświetlanie 1-7 z 7
    Tytuł:
    Hot Compression Test of Heat Resistant Steel
    Autorzy:
    Fedoriková, A.
    Kvačkaj, T.
    Kočiško, R.
    Bidulský, R.
    Petroušek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032933.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    81.40.Gh
    81.40.Np
    02.70.Dh
    Opis:
    This article deals with the analysis of formability of heat resistant steel type 9Cr-1Mo by physical laboratory simulation - hot compression test. The 9Cr-1Mo steel belongs to modern 9%Cr tempered martensitic steel for high-temperature applications in advanced thermal power plants. The shape of the sample was defined based on numerical simulations. The laboratory simulation of forming process called physical simulation - specifically hot compression test was realized in the temperature range from 500 to 950°C and total deformation in the range from 39 to 52%. Cracks formed during hot compression test in the notches are assessed. Subsequently, the relation between the compression temperature, strain, and crack length was defined. The suitable workability corresponds to the temperature range 650-900°C, it agrees with results of numerical simulations. At a temperature of 900°C there is marginal relative deformation without rupture ε =39.9%, which corresponds to the value according to simulations NCL criteria 0.501.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1340-1343
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formability Evaluation of Aluminium Alloys by FLD Diagrams
    Autorzy:
    Petroušek, P.
    Kočiško, R.
    Kvačkaj, T.
    Bidulský, R.
    Bidulská, J.
    Fedoriková, A.
    Sabol, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032922.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Hy
    62.10.+s
    62.20.M-
    81.05.-t
    82.80.-d
    Opis:
    The goal of the present work is evaluated mechanical properties and forming limit diagrams of ambient rolled aluminium alloy based on AlMgSi. Forming limit diagrams are convenient and often used as a tool for the classification of the formability and the evaluation of the forming process of sheet materials. Forming limits of sheet metal are represented in the forming limit diagrams occurring by various deformation states. The most widely used type is the Keeler-Goodwin diagram. Input data got from static tensile test are important for formability evaluating of the thin sheet by mathematical simulations, such as tensile strength, yield strength, elongation, and the strain hardening exponent. The result is a consideration of the suitability of the material for stamping technology.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1344-1346
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of ECAP-Back Pressure on the Porosity Distribution
    Autorzy:
    Bidulská, J.
    Kvačkaj, T.
    Kočiško, R.
    Bidulský, R.
    Actis Grande, M.
    Donič, T.
    Martikán, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538174.pdf
    Data publikacji:
    2010-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    81.20.Ev
    81.40.-z
    81.70.Fy
    Opis:
    The main aim of this paper is to show how back pressure equal channel angular pressing (ECAP-BP) influences the porosity distribution in powder metallurgy (PM) aluminium alloys. When back pressure is applied, the accumulation of damage in deformed samples decreases due to the fact that the shear strain takes place under predominantly compressive stresses. Consequently, ECAP-BP influences the porosity distribution in terms of the severe shear deformation involved. According to the obtained results, interesting applications for this new progressive method in physical and metallurgical research fields are shown.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 5; 864-868
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the Ultrafine-Grained Structure Formation Under Different Strain Rates
    Autorzy:
    Kováčová, A.
    Kvačkaj, T.
    Bidulský, R.
    Bidulská, J.
    Kočiško, R.
    Dutkiewicz, J.
    Lityńska-Dobrzyńska, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/353994.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electron microscopy
    EBSD
    nanostructured materials
    equal channel angular processing
    grain refinement
    Opis:
    The present paper deals with a study on formation of specific substructural features in OFHC copper processed by equalchannel angular pressing (ECAP) considering different strain rate conditions. Since two mechanical tensile testing equipments were being used, strain rate response could be studied in a wide range (both in static and dynamic regimes). Moreover, the copper before tensile testing was subjected to drawing and ECAP, separately, which allows to study the influence of both structural and substructural features (CG vs. UFG structure). Considering the static regime, it was found that UFG materials have advanced properties, showing higher strength and ductility in comparison to their CG counterparts. However, this is valid only to the critical value of the strain rate. In the dynamic regime, mathematical linearized results imply that ultimate tensile strength in samples processed by ECAP increases twice every 10 s-1 rising, however, they lost approximately the same plastic properties than samples after drawing. Differences in the progress of mechanical properties are related to specific structural and substructural features evolved in the material during ECAP processing. Above mentioned features were studied in detail by methods of transmission and scanning electron microscopy (TEM, SEM).
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2A; 851-856
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of workability test to SPD processing
    Zastosowanie testu obrabialności do intensywnego odkształcenia plastycznego
    Autorzy:
    Kvačkaj, T.
    Kočiško, R.
    Tiža, J
    Bidulská, J.
    Kováčová, A
    Bidulský, R
    Bascó, J
    Vlado, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/351817.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    compression test
    powder metallurgy
    fracture criteria
    ECAR
    Deform 3D
    próba ściskania
    metalurgia proszków
    kryteria pękania
    Opis:
    The aluminium alloy with chemical conception AlMgSi prepared by PM (powder metallurgy) technology was used. The experiments such as a ring and compression test, ECAR (equal channel angular rolling) for determination of friction coefficient, stress-strain curves and material workability based on analytical methods (Freudenthal, Cockcroft-Latham and normalized Cockcroft-Latham criteria) were performed. Numerical simulations of sample processed by ECAR was carried out by a software Deform 3D with focus on the description of stress, strain fields and workability criteria (Cockcroft-Latham and normalized Cockcroft-Latham). The prediction of fracture formations in a real ECAR sample during processing conditions was also done.
    Stop aluminium o składzie chemicznym AlMgSi przygotowano metodą proszkową. Wykonano badania takie jak próba ściskania swobodnego pierścieni i walcowatych, ECAR (wyciskanie w kanale kątowym z walcowaniem) w celu wyznaczenia współczynnika tarcia, krzywych naprężenie-odkształcenie oraz podatności materiału na odkształcenie z użyciem metod analitycznych (kryterium Freudenthal, Cockcroft-Latham i znormalizowane Cockcroft-Latham). Symulacje numeryczne dla próbki poddawanej procesowi ECAR przeprowadzono przy pomocy oprogramowania Deform 3D z naciskiem na opis pól sił i naprężeń oraz kryteriów obrabialności (Cockcroft-Latham i znormalizowane Cockcroft-Latham). Przeprowadzono również symulacje mozliwości tworzenia się pęknięć w rzeczywistej próbce poddanej procesowi ECAR.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 2; 407-412
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical and Structural Properties of High Purity Al Processed by ECAP
    Autorzy:
    Kvačkaj, T.
    Kočiško, R.
    Pokorný, I.
    Bidulská, J.
    Kvačkaj, M.
    Kováčová, A.
    Bidulský, R.
    Lityńska-Dobrzyńska, L.
    Dutkiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1418957.pdf
    Data publikacji:
    2012-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    81.07.-b
    81.20.Hy
    81.40.-z
    Opis:
    The mechanical properties and substructure formation of high purity aluminium (99.999%) processed by severe plastic deformation method (equal channel angular pressing) were studied. The equal channel angular pressing process was carried out at room temperature by route C (sample rotation around the axis about 180° after each pass) in a die with two channels intersecting at an angle of Φp = 90. The softening mechanism through dynamic recovery was recognized up to 6th equal channel angular pressing pass, however, after that the mechanical strengthening was revealed. The samples after equal channel angular pressing processing were annealed in different temperature and time conditions. The influence of annealing temperature and time on microhardness as well as diameter of grain size were investigated in samples processed by the 4th equal channel angular pressing pass.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 3; 557-560
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Cryo-Rolling and Annealing on Magnetic Properties in Non-Oriented Electrical Steel
    Autorzy:
    Kvačkaj, T.
    Bella, P.
    Bidulský, R.
    Kočiško, R.
    Petroušek, P.
    Fedoriková, A.
    Bidulská, J.
    Jandačka, P.
    Lupták, M.
    Černík, M.
    Pernis, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032280.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Bb
    81.05.Bx
    81.40.Rs
    81.40.Ef
    Opis:
    The goal of the present work is to compare progressive technology - rolling at cryogenic temperature and classical rolling at ambient temperature followed by an investigation of their impact on the final microstructure and the magnetic properties of non-oriented electrical steel. Non-oriented electrical steel is characterized by high magnetic induction, low magnetic losses, and low coercivity. The best magnetic properties are achieved using preferable texture and optimal grain size. In this paper there is analyzed the percentage of different textural components after cryo-rolling and after rolling at ambient temperature. To obtain maps of inverse pole figures, the electron backscatter diffraction method was used. The main contribution of this study was that the samples rolled at cryo conditions and after final annealing reached better magnetic properties than at ambient temperature, which was reflected by low magnetic losses and coercivity.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1105-1107
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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