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    Wyświetlanie 1-4 z 4
    Tytuł:
    Modelling of phenomena in solid state for the steel casting cooled by liquid
    Autorzy:
    Kulawik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/381245.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat treatment
    phase transformation
    convection
    cooling process
    liquid coolant
    obróbka cieplna
    przemiana fazowa
    konwekcja
    stygnięcie odlewu
    płyn niskokrzepnący
    Opis:
    In this paper a mathematical model of cooling process for steel castings is presented. Effect of convective motion of the coolant on material structure after cooling process is investigated. Mathematical and numerical model based on Generalized Difference Method for axysimmertric elements is used. To solve the Navier-Stokes equation the characteristic based split scheme (CBS) has been applied. The solution of the heat transport equation with the convective term has been obtained by a stabilized meshless method. To determine of the phase transformation the macroscopic model built on the basis of Time Temperature Transformation diagrams for continuous cooling of medium-carbon steel has been used. The temporary temperature fields, the phase transformation, thermal and structural strains for the cooled element and the fields of temperature and velocity for the coolant have been determined.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 2 spec.; 135-138
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of heating rate on sorbitic transformation temperature of tempering C45 steel
    Autorzy:
    Kulawik, A.
    Winczek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/383135.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat treatment
    laser treatment
    tempering
    phase transformation
    obróbka cieplna
    obróbka laserowa
    odpuszczanie stali
    przemiana fazowa
    Opis:
    In this paper the analysis of speed heating influence on sorbitic transormation temperature of tempering C45 steel is presented. On the basis of dilatometric research, functions associating heating time with initial and final temperature of sorbitic transformation have been determined as well as the size structural (γ) and thermal (α) expansion coefficients of quenching and tempering structures have been estimated.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 2 spec.; 131-134
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Artificial Neural Network to the Control of the Parameters of the Heat Treatment Process of Casting
    Autorzy:
    Wróbel, J.
    Kulawik, A.
    Bokota, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/382692.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat treatment
    moving heat source
    artificial neural network
    numerical modelling
    control system
    heating process
    obróbka cieplna
    źródło ciepła ruchome
    sztuczna sieć neuronowa
    modelowanie numeryczne
    system sterowania
    proces nagrzewania
    Opis:
    In the paper the use of the artificial neural network to the control of the work of heat treating equipment for the long axisymmetric steel elements with variable diameters is presented. It is assumed that the velocity of the heat source is modified in the process and is in real time updated according to the current diameter. The measurement of the diameter is performed at a constant distance from the heat source (Δz = 0). The main task of the model is control the assumed values of temperature at constant parameters of the heat source such as radius and power. Therefore the parameter of the process controlled by the artificial neural network is the velocity of the heat source. The input data of the network are the values of temperature and the radius of the heated element. The learning, testing and validation sets were determined by using the equation of steady heat transfer process with a convective term. To verify the possibilities of the presented algorithm, based on the solve of the unsteady heat conduction with finite element method, a numerical simulation is performed. The calculations confirm the effectiveness of use of the presented solution, in order to obtain for example the constant depth of the heat affected zone for the geometrically variable hardened axisymmetric objects.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1; 119-124
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Model and Numerical Analysis of Hardening Phenomena for Hot-work Tool Steel
    Autorzy:
    Bokota, A.
    Kulawik, A.
    Szymczyk, R.
    Wróbel, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/382306.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat treatment
    tool steel
    phase transformation
    stresses
    finite element analysis
    obróbka cieplna
    stal narzędziowa
    przemiany fazowe
    naprężenia
    metoda elementów skończonych
    Opis:
    In the paper the complex model of hardening of the hot-work tool steel is presented. Model of estimation of phase fractions and their kinetics is based on the continuous cooling diagram (CCT). Phase fractions which occur during the continuous heating and cooling (austenite, pearlite or bainite) are described by Johnson-Mehl-Avrami-Kolmogorov (JMAK) formula. To determine of the formed martensite the modified Koistinen-Marburger (KM) equation is used. The stresses and strains are calculated by the solution of equilibrium equations in the rate form. Model takes into account the thermal, structural, plastic strains and transformation plasticity. The thermophysical properties occurring in the constitutive relations are dependent on phase compositions and temperature. To calculate the plastic strains the Huber-Mises plasticity condition with isotopic hardening is used. Whereas to determine transformations induced plasticity the Leblond model is applied. The numerical analysis of phase compositions and residual stresses in the hot-work steel element is considered.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 3 spec.; 9-14
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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