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    Tytuł:
    Optimization of simulation model parameters for solidification of metals with use of agent-based evolutionary algorithm
    Optymalizacja parametrów modelu symulacyjnego procesu krzepnięcia metali z zastosowaniem agentowego algorytmu ewolucyjnego
    Autorzy:
    Kluska-Nawarecka, S.
    Smolarek-Grzyb, A.
    Byrski, A.
    Wilk-Kołodziejczyk, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/305357.pdf
    Data publikacji:
    2008
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    numeryczna symulacja
    algorytmy ewolucyjne
    system agentowy
    proces krzepnięcia odlewów
    odlew
    numerical simulation
    evolutionary algorithm
    agent systems
    solidification casting process
    casting
    Opis:
    The finite elements method (FEM) is currently widely used for simulation of thermal processes. However, one of still unresolved problems remains proper selection of mathematical model parameters for these processes. As far as modelling of cooling casts in forms is concerned, particular difficulties appear while estimating values of numerous coefficients such as: heat transport coefficient between metal and form, specific heat, metal and form heat conduction coefficient, metal and form density. Coefficients mentioned above depend not only on materials properties but also on temperature. In the paper the idea of optimalization of simulation method parameters based on adaptive adjustment of curve representing simulation result and result obtained in physical experiment is presented along with the idea of evolutionary and agent-based evolutionary optimization system designed to conduct such optimizations. Preliminary results obtained with use of ABAQUS system available in ACK CYFRONET and software developed at AGH-UST conclude the paper.
    Metoda elementów skończonych (MES) znajduje obecnie liczne zastosowania w symulacji procesów cieplnych. Wciąż jednak nierozwiązalny pozostaje problem doboru niektórych współczynników modeli matematycznych tych procesów. Przy modelowaniu stygnięcia odlewów w formie, szczególne trudności powstają przy wyznaczeniu wartości licznych parametrów, np.: współczynnika transportu ciepła pomiędzy metalem a formą, ciepła właściwego, współczynnika przewodnictwa cieplnego metalu i formy, gęstości metalu i formy. Współczynniki te zależą nie tylko od właściwości materiałów, lecz również od temperatury. W artykule zaproponowano metodę optymalizacji wartości parametrów modelu opartą na adaptacyjnym dostosowaniu krzywej stanowiącej wynik symulacji do przebiegu uzyskanego w eksperymencie fizycznym z zastosowaniem algorytmu ewolucyjnego w wersji agentowej. Wstępne wyniki obliczeń zostały zrealizowane przy wykorzystaniu systemu ABAQUS dostępnego w ACK CYFRONET oraz oprogramowania opracowanego przez AGH-UST.
    Źródło:
    Computer Science; 2008, 9; 55-66
    1508-2806
    2300-7036
    Pojawia się w:
    Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Type and Shape of the Chill on Solidification Process of Steel Casting
    Autorzy:
    Jaromin, M.
    Dojka, R.
    Jezierski, J. R.
    Dojka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380243.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    crystallization process
    computer simulation
    steel casting
    chill
    proces krzepnięcia
    proces krystalizacji
    symulacja komputerowa
    odlewy stalowe
    chłód
    Opis:
    The article is a case study of the steel milling ring casting of about 6 tonnes net weight. The casting has been cast in the steel foundry the authors have been cooperating with. The aim was to analyse the influence of the shape of the chills and the material which was used to make them on the casting crystallization process. To optimally design the chills the set of the computer simulation has been carried out with 3 chills’ shape versions and 3 material’s versions and the results have been compared with the technology being in use (no chills). The proposed chills were of different thermal conductivity from low to high. Their shapes were obviously dependant on the adjacent casting surface geometry but were the result of the attempt to optimise their effect with the minimum weight, too. The chills working efficiency was analysed jointly with the previously designed top feeders system. The following parameters have been chosen to compare their effectiveness and the crystallization process: time to complete solidification and so-called fed volume describing the casting feeding efficiency. The computer simulations have been carried out with use of MagmaSoft v. 5.2 software. Finally, the optimisation has led to 15% better steel yield thanks to 60% top feeders weight reduction and 40% shorter solidification time. The steel ring cast with use of such technology fulfil all quality criteria.
    Źródło:
    Archives of Foundry Engineering; 2019, 1; 35-40
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Casting Velocity on Structure of Al Continuous Ingots
    Autorzy:
    Bartocha, D.
    Wróbel, T.
    Szajnar, J.
    Adamczyk, W.
    Jamrozik, W.
    Dojka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/354184.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum
    primary structure
    ingot
    continuous casting
    simulation of solidification process
    Opis:
    The aim of paper was determination of influence of the casting velocity in horizontal continuous casting process on solidification phenomenon and next primary structure of aluminum ingots. In the range of studies was conducted the experiment concerning continuous casting of Al ingots with diameter 30 mm at velocity from 30 to 80 mm/min. Moreover was developed adequate to the real the virtual model of cooled water continuous casting mould, which was used in simulation of solidification process of Al continuous ingot, made in ANSYS Fluent software. In result was determined the influence of casting velocity and temperature of cooling water on position of crystallization front inside the continuous casting mould. While the shape and size of grains in primary structure of Al continuous ingots were determined on the basis of metallographic macroscopic studies. On the basis of the results analysis was affirmed that increase of casting velocity strongly influences on position of crystallization front and causes increase of temperature of ingot leaving the continuous casting mould. In result the increase of casting velocity supposedly leads to decrease of temperature gradient on crystallization front what creates coarse grains in primary structure of aluminum continuous ingots and caused low usable properties i.e. suitability to plastic deformation.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1609-1613
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sensitivity of conti-casting process with respect to cooling conditions
    Analiza wrażliwości procesu ciągłego odlewania na warunki chłodzenia wlewka
    Autorzy:
    Mochnacki, B.
    Majchrzak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/281418.pdf
    Data publikacji:
    2002
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    continuous casting
    solidification process
    sensitivity analysis
    boundary element method
    Opis:
    In the first part of this paper mathematical description of heat transfer processes proceeding in the domain of continuous casting is presented. The approach called the second generation modelling is taken into account. In particular, the capacity of a source function in the energy equation is determined by the nucleation and growth laws and the Johnson-Mehl-Avrami-Kolmogorow theory. Next, on the basis of the methods of sensitivity analysis the influence of cooling conditions of the cast slab surface on the course of solidification process is analyzed. At the stage of numerical computations the boundary element method has been used. In the final part of the paper an example of computations is presented.
    W pierwszej części pracy przedstawiono opis matematyczny krzepnięcia wlewka ciągłego wytwarzanego z czystego matalu. Do opisu wykorzystano podeście nazywane modelem drugiej generacji. W szczególności, wydajność wewnętrznych źródeł ciepła będąca składnikiem równania energii jest wyznaczana na podstawie praw zarodkowania i wzrostu oraz teorii Johnsona-Mehla-Avrami-Kołomogorowa. Następnie, wykorzystując metodę bezpośrednią analizy wrażliwości, badano wpływ warunków chłodzenia powierzchni wlewka na proces jego krzepnięcia. Na etapie obliczeń numerycznych zastosowano metodę elementów brzegowych. W końcowej części pracy pokazano przykład obliczeń numerycznych.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2002, 40, 1; 129-147
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Temperature and Velocity Fields During Filling of Continuous Casting Mould
    Autorzy:
    Sowa, L.
    Skrzypczak, T.
    Kwiatoń, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/379679.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    continuous casting
    numerical simulation
    molten metal flow
    krzepnięcie
    odlewanie
    symulacja numeryczna
    Opis:
    In this paper, the mathematical model and numerical simulations of the molten steel flow by the submerged entry nozzle and the filling process of the continuous casting mould cavity are presented. In the mathematical model, the temperature fields were obtained by solving the energy equation, while the velocity fields were calculated by solving the momentum equations and the continuity equation. These equations contain the turbulent viscosity which is found by solving two additional transport equations for the turbulent kinetic energy and its rate of dissipation. In the numerical simulations, coupling of the thermal and fluid flow phenomena by changes in the thermophysical parameters of alloy depending on the temperature has been taken into consideration. This problem (2D) was solved by using the finite element method. Numerical simulations of filling the continuous casting mould cavity were performed for two variants of liquid metal pouring. The effect of the cases of pouring the continuous casting mould on the velocity fields and the solid phase growth kinetics in the process of filling the continuous casting mould was evaluated as these magnitudes have an influence on the high quality of the continuous cast steel slab.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 1; 115-118
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of Casting Technologies for Al-Si-Cu Plate Casting
    Autorzy:
    Cupido, L. H.
    Żak, P. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/379873.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    information technology
    foundry industry
    aluminium alloy
    oxide film
    casting simulation
    krzepnięcie stopu
    technologia informatyczna
    przemysł odlewniczy
    stop aluminium
    warstwa tlenkowa
    symulacja odlewania
    Opis:
    During the casting of aluminium alloys, the susceptibility to form oxide films is high, due to the turbulent flow of the melt and constant exposure of new surface area. This have impact on the properties of the material and the service life of the casting components. Also, hydrogen solubility in the solid state are very low, which ends up being rejected and causing porosity. After pouring, when solidification occurs, another phenomenon arise called shrinkage. This require excess molten metal to be fed during this phase change to eliminate or reduce the effect of volumetric changes. Filling and feeding during aluminium casting is therefore of paramount importance, and careful steps needs to be undertaken to reduce possible defects in the castings. The objective is to apply studied literature guides and rules and simulate the casting process of aluminium alloys, and understand the how certain defects are occurring during this process. This is a preliminary study towards the understanding of the “macro evolution” of Al-Si-Cu alloy during solidification, which will be the bases for the study of microsegregation of the specified alloy.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 3 spec.; 11-14
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Simulation of Directional Solidification Process of Single Crystal Ni- Based Superalloy Casting
    Autorzy:
    Szeliga, D.
    Kubiak, K.
    Sieniawski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/383046.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    single crystal
    superalloys
    nickel based superalloys
    ProCAST
    casting defects
    numerical simulation
    monokryształy
    superstopy
    nikiel
    wady odlewu
    symulacja numeryczna
    Opis:
    The analysis of influence of mould withdrawal rate on the solidification process of CMSX-4 single crystal castings produced by Bridgman method was presented in this paper. The predicted values of temperature gradient, solidification and cooling rate, were determined at the longitudinal section of casting blade withdrawn at rate from 1 to 6mm/min using ProCAST software. It was found that the increase of withdrawal rate of ceramic mould results in the decrease of temperature gradient and the growth of cooling rate, along blade height. Based on results of solidification parameter G/R (temperature gradient/solidification rate), maximum withdrawal rate of ceramic mould (3.5 mm/min), which ensures lower susceptibility to formation process of new grain defects in single crystal, was established. It was proved that these defects can be formed in the bottom part of casting at withdrawal rate of 4 mm/min. The increase of withdrawal rate to 5 and 6 mm/min results in additional growth of susceptibility of defects formation along the whole height of airfoil.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 2; 111-118
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical modeling of the solidification process with consideration of shrinkage cavities formation and the influence of solid phase content on the feeding of the casting
    Autorzy:
    Węgrzyn-Skrzypczak, Ewa
    Skrzypczak, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/24201503.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    solidification process
    finite element method
    shrinkage cavity
    computational mechanics
    proces krzepnięcia
    metoda elementów skończonych
    jama skurczowa
    mechanika komputerowa
    Opis:
    The paper focuses on the numerical modeling of the three-dimensional solidification process of steel using the finite element method (FEM). The model includes and discusses the formation of shrinkage cavities and the influence of the solid phase content on the feeding of the casting through the riser. The analysis assumed a critical value of the solid phase content, at which the transport of liquid phase from the riser to the casting is interrupted. The results of numerical simulation are presented to investigate the influence of this factor on the final quality of the casting. The model neglects the fluid motion in the liquid and solid-liquid regions and replaces the influence of the mold with appropriate boundary conditions.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2023, 22, 2; 75--86
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical Properties of Magnesium Alloys Produced by the Heated Mold Continuous Casting Process
    Autorzy:
    Okayasu, M.
    Wu, S.
    Tanimoto, T.
    Takeuchi, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/381654.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magnesium alloy
    unidirectional solidification
    continuous casting
    mechanical properties
    microstructural characteristic
    stop magnezu
    krystalizacja kierunkowa
    odlewanie ciągłe
    właściwości mechaniczne
    charakterystyka mikrostrukturalna
    Opis:
    Investigation of the tensile and fatigue properties of cast magnesium alloys, created by the heated mold continuous casting process (HMC), was conducted. The mechanical properties of the Mg-HMC alloys were overall higher than those for the Mg alloys, made by the conventional gravity casting process (GC), and especially excellent mechanical properties were obtained for the Mg97Y2Zn1-HMC alloy. This was because of the fine-grained structure composed of the α-Mg phases with the interdendritic LPSO phase. Such mechanical properties were similar levels to those for conventional cast aluminum alloy (Al84.7Si10.5Cu2.5Fe1.3Zn1 alloys: ADC12), made by the GC process. Moreover, the tensile properties (σ and εf) and fatigue properties of the Mg97Y2Zn1-HMC alloy were about 1.5 times higher than that for the commercial Mg90Al9Zn1-GC alloy (AZ91). The high correlation rate between tensile properties and fatigue strength (endurance limit: σl) was obtained. With newly proposed etching technique, the residual stress in the Mg97Y2Zn1 alloy could be revealed, and it appeared that the high internal stress was severely accumulated in and around the long-period stacking-order phases (LPSO). This was made during the solidification process due to the different shrinkage rate between α-Mg and LPSO. In this etching technique, micro-cracks were observed on the sample surface, and amount of micro-cracks (density) could be a parameter to determine the severity of the internal stress, i.e., a large amount to micro-cracks is caused by the high internal stress.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 4; 208-216
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza procesu zalewania i krzepnięcia odlewów ze staliwa stopowego przeznaczonego do pracy w niskich temperaturach
    Analysis of the pouring and solidification process of alloyed steel castings for low - temperature performance
    Autorzy:
    Gwiżdż, A.
    Pirowski, Z.
    Pysz, S.
    Żuczek, R.
    Dworak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/391755.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    symulacja
    proces zalewania
    krzepnięcie
    porowatość
    wady odlewów
    simulation
    pouring process
    solidification
    porosity
    casting defects
    Opis:
    Przedstawiona praca stanowiła część badań przemysłowych (stosowanych) wykonywanych w ramach projektu celowego ROW-II-403/2008 realizowanego w MAGNUS-NORD Sp z o.o w Toruniu. Przeprowadzono symulację zalewania i krzepnięcia dwóch dużych odlewów staliwnych o masie: I - około 200 kg i II - około 700 kg, wg dotychczas stosowanej technologii. Po analizie wyników symulacji zaproponowano zmiany w technologii odlewania. Po wprowadzeniu zmian w technologii, ponownie przeprowadzono symulację komputerową. Analiza jej wyników wykazała zdecydowaną poprawę warunków krzepnięcia i wyeliminowanie powstających porowatości i jam skurczowych.
    The study forms a part of the program of applied industrial research executed under Target Project No. ROW-II-403/2008 at MAGNUS-NORD Sp z o.o in Toruń. Pouring and solidification of two large steel castings weighing 200 kg (casting I) and 700 kg (casting II) was simulated, basing on the casting manufacturing technology used up to now. Detailed analysis of the results of simulation resulted in changes proposed and introduced to the so far used manufacturing technology. After the said changes had been introduced, the simulation of the casting process was done once again. The analysis of the obtained results indicated a substantial improvement in the solidification conditions and effectively eliminated the porosities and shrinkage cavities.
    Źródło:
    Prace Instytutu Odlewnictwa; 2009, 49, 1; 43-52
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculation of phase-change boundary position in continuous casting
    Autorzy:
    Ivanova, A. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/380559.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    information technology
    foundry industry
    mathematical modeling
    temperature distribution
    Stefan condition
    phase change boundary
    continuous casting
    krzepnięcie stopu
    technologia informacyjna
    przemysł odlewniczy
    modelowanie matematyczne
    rozkład temperatury
    warunek Stefana
    granica międzyfazowa
    odlewanie ciągłe
    Opis:
    The problem of determination of the phase-change boundary position at the mathematical modeling of continuous ingot temperature field is considered. The description of the heat transfer process takes into account the dependence of the thermal physical characteristics on the temperature, so that the mathematical model is based on the nonlinear partial differential equations. The boundary position between liquid and solid phase is given by the temperatures equality condition and the Stefan condition for the two-dimensional case. The new method of calculation of the phase-change boundary position is proposed. This method based on the finite-differences with using explicit schemes and on the iteration method of solving of non-linear system equations. The proposed method of calculation is many times faster than the real time. So that it amenable to be used for model predictive control of continuous semifinished product solidification.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 4; 57-62
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Modelling of Fluid Flow and Thermal Phenomena in the Tundish of CSC Machine
    Autorzy:
    Sowa, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/380813.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    foundry industry
    information technology
    continuous casting
    molten metal
    krzepnięcie
    przemysł odlewniczy
    odlewanie ciągłe
    metal płynny
    Opis:
    The mathematical and numerical simulation model of the liquid steel flow in a tundish is presented in this paper. The problem was treated as a complex and solved by the finite element method. The single-strand slab tundish is used to continuous casting slabs. The internal work space of the tundish was modified by the following flow control devices. The first device was a striker pad situated in the pouring tundish zone. The second device was a baffle with three holes and the third device was a baffle without hole. The main purpose of using these devices was to cause a quiet liquid mixing as well as give directional metal flow upwards which facilitated inclusion floatation. The interaction of flow control devices on hydrodynamic conditions was received from numerical simulation. As a result of the computations carried out, the liquid steel flow and steel temperature fields were obtained. The influence of the tundish modification on velocity fields in the liquid phase of steel was estimated, because these have an essential influence on high quality of a continuous steel cast slab.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1; 103-106
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Casting Die Cooling on Solidification Process and Microstructure of Hypereutectic Al-Si Alloy
    Autorzy:
    Władysiak, R.
    Kozuń, A.
    Pacyniak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/380676.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technology
    innovative foundry material
    casting die cooling
    water mist
    hypereutectic silumin
    innowacyjna technologia odlewnicza
    innowacyjny materiał odlewniczy
    odlewanie kokilowe
    mgła wodna
    silumin nadeutektyczny
    Opis:
    The work is a continuation of research concerning the influence of intensive cooling of permanent mold in order to increase the casting efficiency of aluminium alloys using the multipoint water mist cooling system. The paper presents results of investigation of crystallization process and microstructure of synthetic hypereutectic alloys: AlSi15 and AlSi19. Casts were made in permanent mold cooled with water mist stream. The study was conducted for unmodified silumins on the research station allowing the cooling of the special permanent probe using a program of computer control. Furthermore the study used a thermal imaging camera to analyze the solidification process of hypereutectic silumins. The study demonstrated that the use of mold cooled with water mist stream allows in wide range the formation of the microstructure of hypereutectic silumins. It leads to higher homogeneity of microstructure and refinement of crystallizing phases and also it increases subsequently the mechanical properties of casting.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 4; 175-180
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using of Technology Semisolid Squeeze Casting by Different Initial States of Material
    Autorzy:
    Martinec, D.
    Pastirčák, R.
    Kantoríková, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/379567.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technologies
    innovative foundry materials
    solidification process
    squeeze casting
    aluminium alloy
    crystallisation under pressures
    innowacyjne technologie odlewnicze
    innowacyjne materiały odlewnicze
    proces krzepnięcia
    wyciskanie
    stop aluminium
    krystalizacja pod ciśnieniem
    Opis:
    The paper deals with the effect of heating of various prepared batch materials into semisolid state with subsequent solidification of the cast under pressure. The investigated material was a subeutectic aluminium alloy AlSi7Mg0.3. The heating temperature to the semisolid was chosen at 50% liquid phase. The used material was prepared in a variety of ways: heat treatment, inoculation and by squeeze casting. Also the influence of the initial state of material on inheritance of mechanical properties and microstructure was observed. The pressure was 100 MPa. Effect on the resulting casting structure, alpha phase distribution and eutectic silicon was observed. By using semisolid squeeze casting process the mechanical properties and microstructures of the casts has changed. The final microstructure of the casts is very similar to the microstructure that can be reached by technology of thixocasting. The mechanical properties by using semisolid squeeze casting has been increased except the heat treated material.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 1; 117-121
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Riser Shape on Feeding Effectiveness of Solidifying Casting
    Autorzy:
    Sowa, L.
    Skrzypczak, T.
    Kwiatoń, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/383146.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    castings defects
    numerical simulation
    liquid metal flow
    proces krzepnięcia
    wady odlewów
    symulacja numeryczna
    przepływ ciekłego metalu
    Opis:
    The mathematical model and numerical simulations of the solidification of a cylindrical shaped casting, which take into account the process of filling the mould cavity by liquid metal and feeding the casting through the riser during its solidification, are presented in the paper. Mutual dependence of thermal and flow phenomena were taken into account because have an essential influence on solidification process. The effect of the riser shape on the effectiveness of feeding of the solidifying casting was determined. In order to obtain the casting without shrinkage defects, an appropriate selection of riser shape was made, which is important for foundry practice. Numerical calculations of the solidification process of system consisting of the casting and the conical or cylindrical riser were carried out. The velocity fields have been obtained from the solution of momentum equations and continuity equation, while temperature fields from solving the equation of heat conductivity containing the convection term. Changes in thermo-physical parameters as a function of temperature were considered. The finite element method (FEM) was used to solve the problem.
    Źródło:
    Archives of Foundry Engineering; 2019, 4; 91-94
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of eutectic saturation influence on microstructure in thin wall ductile iron casting using cellular automata
    Autorzy:
    Burbelko, A. A.
    Gurgul, D.
    Kapturkiewicz, W.
    Górny, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380375.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    proces krzepnięcia
    automat komórkowy
    modelowanie
    solidification process
    thin cellular automaton
    modeling
    Opis:
    The mathematical model of the globular eutectic solidification in 2D was designed. Proposed model is based on the Cellular Automaton Finite Differences (CA-FD) calculation method. Model has been used for studies of the primary austenite and of globular eutectic grains growth during the ductile iron solidification in the thin wall casting. Model takes into account, among other things, non-uniform temperature distribution in the casting wall cross-section, kinetics of the austenite and graphite grains nucleation, and non-equilibrium nature of the interphase boundary migration. Calculation of eutectic saturation influence (Sc = 0.9 - 1.1) on microstructure (austenite and graphite fraction, density of austenite and graphite grains) and temperature curves in 2 mm wall ductile iron casting has been done.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 4; 11-16
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modele naprężeniowe do oceny wpływu wad odlewniczych na wytrzymałość mechaniczną odlewu
    Stress models and their application in explanation of casting defect influence on the cast part mechanical behaviour
    Autorzy:
    Piekło, J.
    Pysz, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/391779.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    wada odlewu
    model numeryczny
    naprężenie
    symulacja krzepnięcia
    casting defect
    numerical model
    stress
    simulation of solidification process
    Opis:
    Artykuł analizuje możliwość zastosowania analitycznych i numerycznych modeli wady odlewniczej typu pustki do określenia lokalnego wzrostu naprężenia w jej otoczeniu. Wartość tego naprężenia może być jednym z czynników decydujących o dopuszczeniu odlewu do eksploatacji. Analizę zaproponowanych modeli przeprowadzono na przykładzie odlewu zaworu ciśnieniowego wykonanego z żeliwa EN GJS 400 -15.
    The article examines possible use of analytical and numerical models of casting defects of a void type in determination of local increase of stresses in the vicinity of casting defect. The stress level can be one of the factors that will decide about the casting acceptance for service. The proposed models were examined on the example of a pressure valve made from cast iron of EN GJS 400 - 15 grade.
    Źródło:
    Prace Instytutu Odlewnictwa; 2009, 49, 4; 39-48
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of nozzle outlet angle on flow and temperature field in a slab continuous casting mould
    Wpływ kąta wypływu dyszy na pole prędkości i temperatury w krystalizatorze ciągłego odlewania wlewków płaskich
    Autorzy:
    Sowa, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/382373.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    continuous casting
    molten metal flow
    numerical simulation
    proces krzepnięcia
    odlewanie ciągłe
    metal ciekły
    symulacja numeryczna
    Opis:
    The mathematical and numerical simulation model of the growth of the solid metal phase within a continuous cast slab is presented in this paper. The problem was treated as a complex one. The velocity fields are obtained by solving the momentum equations and the continuity equation, whereas the thermal fields are calculated by solving the conduction equation with the convection term. One takes into consideration in the mathematical model the changes of thermophysical parameters depending on the temperature and the solid phase volume fractions in the mushy zone. The problem was solved by the finite element method. A numerical simulation of the cast slab solidification process was made for different cases of continuous casting mould pouring by molten metal. The effect of nozzle outlet angle on the velocity fields in liquid phase and the solid phase growth kinetics of the cast slab were investigated, because these magnitudes have essential an influence on high-quality of a continuous steel cast slab.
    W pracy przedstawiono model matematyczny i numeryczny narastania fazy stałej we wlewku ciągłego odlewania. Zadanie potraktowano kompleksowo. Pola prędkości otrzymano z rozwiązania równań pędu i równania ciągłości przepływu, natomiast pola temperatury z rozwiązania równania przewodnictwa z członem konwekcyjnym. Uwzględniono zmianę parametrów termofizycznych od temperatury i od udziału fazy stałej w dwufazowej strefie przejściowej. Problem rozwiązano metodą elementów skończonych. Analizie poddano krystalizator o przekroju prostokątnym. Symulacje numeryczne procesu krzepnięcia wlewka wykonano dla różnych wariantów doprowadzenia ciekłego metalu do krystalizatora (różne kąty wypływu strumienia ciekłego metalu z dyszy wylewu zanurzonego). Badano wpływ zalewania krystalizatora na pole prędkości w fazie ciekłej i kinetykę narastania fazy stałej wlewka ciągłego odlewania.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 2 spec.; 199-202
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Defects in Castings Cast by Rheocasting Method SEED
    Autorzy:
    Bryksi Stunova, B.
    Bryksi, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/381889.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    innovative foundry technologies
    innovative foundry materials
    rheocasting
    casting defects
    simulation
    krzepnięcie
    innowacyjne technologie odlewnicze
    innowacyjne materiały odlewnicze
    wady odlewów
    symulacja
    Opis:
    The paper analyses specific defects of castings produced by semi-solid casting process, especially rheocasting method SEED, which uses mechanical swirling for reaching proper structure in semisolid state with high content of solid fraction. Heat treated alloy AlSi7Mg0.3 was applied for producing an Engine Bracket casting part. For observing structure, metallographic observation by light and SEM microscopy was used. To analyse the process, software ProCAST was used to simulate the movements in shot chamber and filling of the mold.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 3; 15-18
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Metal Pouring Conditions on the Formation of Defects in the Casting
    Autorzy:
    Sowa, L.
    Skrzypczak, T.
    Kwiatoń, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/946863.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    castings defects
    solidification process
    numerical modelling
    molten metal flow
    wady odlewów
    proces krzepnięcia
    modelowanie numeryczne
    metal ciekły
    Opis:
    The mathematical model and numerical simulations of the solidification of a cylindrical casting, which take into account the process of the mould cavity filling by liquid metal and the feeding of the casting through the conical riser during its solidification, are proposed in the paper. The interdependence of thermal and flow phenomena were taken into account because they have an essential influence on solidification process. The effect of the pouring temperature and pouring velocity of the metal on the solidification kinetics of the casting was determined. In order to obtain the casting without shrinkage defects, an appropriate selection of these parameters was tried, which is important for foundry practice. The velocity fields have been obtained from the solution of Navier-Stokes equations and continuity equation, while temperature fields from solving the equation of heat conductivity containing the convection term. In the solidification modelling the changes in thermo-physical parameters as a function of temperature were considered. The finite element method (FEM) was used to solve the problem.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 2; 31-36
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of influence of the mold material on the distribution of shrinkage cavities
    Autorzy:
    Dyja, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/379945.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    information technology
    foundry industry
    casting defect
    macroshrinkage
    solidification process
    finite element method
    technologia informacyjna
    przemysł odlewniczy
    wada odlewu
    krzepnięcie stopu
    metoda elementów skończonych
    Opis:
    Production of castings, like any other field of technology is aimed at providing high-quality product, free from defects. One of the main causes of defects in castings is the phenomenon of shrinkage of the casting. This phenomenon causes the formation of shrinkage cavities and porosity in the casting. The major preventive measure is supplementing a shortage of liquid metal. For supplement to be effective, it is necessary to use risers in proper shapes. Usually, the risers are selected on the basis of determination the place of formation of hot-spots in the castings. Although in these places the shrinkage defects are most likely to occur, shape and size of these defects are also affected by other factors. The article describes the original program setting out the shape and location of possible cavities in the casting. In the program is also taken into account the effect of temperature on the change in volume of liquid metal and the resultant differences in the shape and size of formed shrinkage cavities. The aim of the article is to describe the influence that have material properties of the mold on the simulation results.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 1; 15-18
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Silicon Carbide Chills in Controlling the Solidification Process of Casts Made of IN-713C Nickel Superalloy
    Autorzy:
    Szeliga, D.
    Kubiak, K.
    Cygan, R.
    Ziaja, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/379538.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    silicon carbide
    precision casting
    porosity
    nickel superalloy
    węglik krzemu
    odlewanie precyzyjne
    porowatość
    Opis:
    The paper presents the method of manufacturing casts made of the IN-713C nickel superalloy using the wax lost investment casting process and silicon carbide chills. The authors designed experimental casts, the gating system and selected the chills material. Wax pattern, ceramic shell mould and experimental casts were prepared for the purposes of research. On the basis of the temperature distribution measurements, the kinetics of the solidification process was determined in the thickened part of the plate cast. This allowed to establish the quantity of phase transitions which occurred during cast cooling process and the approximate values of liquidus, eutectic, solidus and solvus temperatures as well as the solidification time and the average value of cast cooling rate. Non-destructive testing and macroscopic analysis were applied to determine the location and size of shrinkage defects. The authors present the mechanism of solidification and formation of shrinkage defects in casts with and without chills. It was found that the applied chills influence significantly the hot spots and the remaining part of the cast. Their presence allows to create conditions for solidification of IN-713C nickel superalloy cast without shrinkage defects.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 2s; 105-111
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Problem of the moving boundary in continuous casting solved by the analytic-numerical method
    Autorzy:
    Grzymkowski, R.
    Pleszczyński, M.
    Hetmaniok, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/383233.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    information technology
    foundry industry
    solidification process
    numerical techniques
    moving boundary problem
    technologia informacyjna
    przemysł odlewniczy
    krzepnięcie stopu
    technika numeryczna
    problem brzegowy
    Opis:
    Mathematical modeling of thermal processes combined with the reversible phase transitions of type: solid phase – liquid phase leads to formulation of the parabolic or elliptic moving boundary problem. Solution of such defined problem requires, most often, to use some sophisticated numerical techniques and far advanced mathematical tools. The paper presents an analytic-numerical method, especially attractive from the engineer’s point of view, applied for finding the approximate solutions of the selected class of problems which can be reduced to the one-phase solidification problem of a plate with the unknown a priori, varying in time boundary of the region in which the solution is sought. Proposed method is based on the known formalism of initial expansion of a sought function, describing the field of temperature, into the power series, some coefficients of which are determined with the aid of boundary conditions, and on the approximation of a function defining the freezing front location with the broken line, parameters of which are determined numerically. The method represents a combination of the analytical and numerical techniques and seems to be an effective and relatively easy in using tool for solving problems of considered kind.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 1; 33-38
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Benefit Effect of Low Addition Yttrium on the Phase αMg and eutectic αMg+γ(Mg17Al12) in AZ91 Alloy
    Autorzy:
    Mikusek, D.
    Rapiejko, C.
    Andrzejczak, A.
    Pacyniak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049625.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magnesium alloy AZ91
    yttrium
    grain refining
    solidification process
    investment casting
    Opis:
    This paper presents results of a study of the effect of inoculation of yttrium on the microstructure of AZ91 alloy. The concentration of the inoculant was increased in samples in the range from 0.1% up to 0.6%. The influence of Y on the thermal effects resulting from the phase transformations occurring during the crystallisation at different inoculant concentrations were examined with the use of Derivative and Thermal Analysis (DTA). The microstructures of the samples were examined with the use of an optical microscope; and an image analysis with a statistical analysis were also carried out. Those analyses aimed at examining oh the effect of inoculation of the Y on the differences between the grain diameters of phase αMg and eutectic αMg+γ(Mg17Al12) in the prepared examined material as well as the average size of each type of grain by way of measuring their perimeters.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 1; 57-63
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical model of thermal and flow phenomena the process growing of the CC slab
    Model numeryczny zjawisk cieplno-przepływowych procesu narastania wlewka COS
    Autorzy:
    Sowa, L.
    Bokota, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/351049.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    krzepnięcie
    przepływ stopionego metalu
    ciągłe odlewanie stali
    symulacja numeryczna
    solidification
    molten metal flow
    continuous casting
    numerical simulation
    Opis:
    The mathematical and numerical simulation model of the growth of the solid metal phase within a continuous cast slab is presented in this paper. The problem was treated as a complex one. The velocity fields are obtained by solving the momentum equations and the continuity equation, whereas the thermal fields are calculated by solving the conduction equation with the convection term. One takes into consideration in the mathematical model the changes of thermophysical parameters depending on the temperature and the solid phase volume fractions in the mushy zone. This formulation of the problem is called a complex model in contrast to the simplified model in which the conduction equation is solved only. The problem was solved by the finite element method. A numerical simulation of the cast slab solidification process was made for different cases of continuous casting mould pouring by molten metal. The influences of cases of the continuous casting mould pouring on the velocity fields in liquid phase and the solid phase growth kinetics of the cast slab were estimated, because these magnitudes have essential an influence on high-quality of a continuous steel cast slab.
    W pracy przedstawiono model matematyczny i numeryczny narastania fazy stałej we wlewku ciągłego odlewania. Zadanie potraktowano kompleksowo. Pola prędkości otrzymano z rozwiązania równań Naviera-Stokesa i równania ciągłości przepływu, natomiast pola temperatury z rozwiązania równania przewodnictwa z członem konwekcyjnym. Uwzględniono zmianę parametrów termofizycznych od temperatury i od udziału fazy stałej w dwufazowej strefie przejściowej. Takie sformułowanie zadania nazwano modelem złożonym w przeciwieństwie do modelu uproszczonego, w którym rozwiązuje się tylko równanie przewodnictwa. Problem rozwiązano metodą elementów skończonych. Analizie poddano krystalizator o przekroju poprzecznym prostokątnym. Symulacje numeryczne procesu krzepnięcia wlewka wykonano dla różnych wariantów doprowadzenia ciekłego metalu do krystalizatora. Badano w ten sposób wpływ zalewania krystalizatora na pole prędkości w fazie ciekłej i kinetykę narastania fazy stałej wlewka, które mają istotny wpływ na jakość wlewka ciągłego odlewania stali.
    Źródło:
    Archives of Metallurgy and Materials; 2011, 56, 2; 359-366
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The composition of reaction substrates for TiC carbides synthesis and its influence on the thickness of iron casting composite layer
    Autorzy:
    Olejnik, E.
    Janas, A.
    Kolbus, A.
    Sikora, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/380875.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite layer
    composite in situ
    SHS process
    solidification process
    superficial layer
    cast iron
    TiC carbides
    warstwa kompozytowa
    kompozyt in situ
    synteza wysokotemperaturowa
    proces krzepnięcia
    warstwa powierzchniowa
    żeliwo
    Opis:
    The effect of reaction substrates for the TiC carbide synthesis on the composite layer thickness produced in cast iron was examined. It was found that, at a constant weight of the charge amounting to 0.5 kg, changing the weight of the, placed in mould, stoichiometric mixture of titanium carbide (from 0.01 to 0.04 kg) changed the thickness of the composite layer from 1 to 15 mm. Carbides synthesis starts directly in mould induced by the temperature of molten alloy poured into this mould (1700 K). The TiC carbides formed in this reaction are later, i.e. during alloy solidification, acting as a base composite material. The size of TiC carbides obtained in the synthesis is from 1 to 10 μm. They occur in the layers as locally compact and coagulated forms. Microstructure, chemical composition and structure of the obtained materials were tested by scanning electron microscopy (SEM), X-ray microanalysis (EDS), and X-ray diffraction (XRD).
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 2 spec.; 165-168
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Structure on the Thermophisical Properties of Thin Walled Castings
    Autorzy:
    Górny, M.
    Lelito, J.
    Kawalec, M.
    Sikora, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/382519.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    thin walled casting
    graphite morphology
    thermal diffusivity
    specific heat
    thermal conductivity
    proces krzepnięcia
    odlew cienkościenny
    morfologia grafitu
    dyfuzyjność termiczna
    ciepło właściwe
    przewodność cieplna
    Opis:
    This study addresses the effect of the cooling rate and of titanium additions on the thermophysical parameters of thin-walled compacted graphite iron (TWCGI) castings. Various molding materials were used (silica sand and insulating sand LDASC- Low-Density Alumina-Silicate Ceramic) to achieve different cooling rates. Different titanium additions were caused by various amount of Ferro Titanium. The research work was conducted for thin-walled iron castings with a 3-mm wall thickness. The tested material represents the occurrence of graphite in the shape of flakes (C and D types, according to the ISO Standard), nodules or compacted graphite with a percent of nodularity and different shape factor. Thermal conductivity has been determined by the laser flash technique in a temperature range of 22-600°C. The results show that the cooling rates together with the titanium content largely influence the graphite morphology and finally thermal conductivity of thin walled iron castings.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 2 spec.; 23-26
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie programu Flow-3D do symulacji procesu zalewania oraz krzepnięcia odlewów z żelaza sferoidalnego. Cz. 1
    Use of Flow-3D program for simulation of pouring and solidification process of ductile cast iron castings. Part 1
    Autorzy:
    Gwiżdż, A.
    Małysza, M.
    Nowak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/391733.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    produkcja odlewnicza
    symulacja zalewania i krzepnięcia
    armatura żeliwna
    sieć gazowa
    casting production
    simulation of pouring and solidification
    cast iron fittings
    gas network
    Opis:
    Przeprowadzono analizę symulacyjną zalewania i krzepnięcia odlewów z żeliwa sferoidalnego EN-GJS-400-15 zasuw miękko uszczelnionych do sieci gazowych z rur PE. Analiza ta przeprowadzona została w programie Flow-3D. Na podstawie dostarczonych przez Fabrykę Armatur JAFAR SA dokumentacji dwuwymiarowej wykonane zostały bryły przestrzenne w programie CAD, które następnie zostały poddane analizie symulacyjnej odlewania oraz krzepnięcia dla zasuw trzech wielkości DN50, DN100 i DN150. W niniejszej pracy przedstawiono analizę dotyczącą odlewów żeliwnych składających się na zasuwę wielkości DN150. Analiza objęła różne warianty technologii odlewnia i była podstawą do wyboru optymalnej technologii, na podstawie, której wykonano dokumentację konstrukcyjną płyt modelowych i modeli do wykonania prototypowych odlewów. Zastosowanie programu Flow-3D do symulacji zalewania i krzepnięcia odlewów do zasuw mniejszych DN50 zostanie przedstawione w części II.
    Pouring and solidification of EN-GJS-400-15 ductile cast iron castings of soft wedge gate valves for PE pipes used in gas pipelines was simulated. The analysis was performed in Flow-3D program. On the basis of the two-dimension documentation provided by Fabryka Armatur JAFAR SA, three-dimension solids were prepared in CAD, which were subsequently subject to simulation analysis of pouring and solidification of castings of gate valves of three sizes: DN50, DN100 and DN150. This paper presents theanalysis of iron castings forming DN150 gate valve. The analysis covered different technologies of casting and was the basis for selecting the optimum casting technology, which became the basis for the preparation of design documentation of match plates and models for the performance of prototype castings. The use of Flow-3D program for the simulation of pouring and solidification process of castings for smaller DN50 gate valves will be described in part II.
    Źródło:
    Prace Instytutu Odlewnictwa; 2013, 53, 1; 35-53
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Mg Additive on the Structure and Electrical Conductivity of Pure Copper Castings
    Autorzy:
    Kranc, M.
    Sikora, G.
    Górny, M.
    Garbacz-Klempka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/382946.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    primary grains
    pure copper
    copper casting
    Mg additive
    electrical conductivity
    proces krzepnięcia
    ziarna pierwotne
    miedź czysta
    odlewanie miedzi
    przewodnictwo elektryczne
    Opis:
    The aim of this paper was to attain defect free, pure copper castings with the highest possible electrical conductivity. In this connection, the effect of magnesium additives on the structure, the degree of undercooling (ΔTα = Tα-Tmin, where Tα – the equilibrium solidification temperature, Tmin – the minimum temperature at the beginning of solidification), electrical conductivity, and the oxygen concentration of pure copper castings have been studied. The two magnesium doses have been investigated; namely 0.1 wt.% and 0.2 wt.%. A thermal analysis was performed (using a type-S thermocouple) to determine the cooling curves. The degree of undercooling and recalescence were determined from the cooling and solidification curves, whereas the macrostructure characteristics were conducted based on a metallographic examination. It has been shown that the reaction of Mg causes solidification to transform from exogenous to endogenous. Finally, the results of electrical conductivity have been shown as well as the oxygen concentration for the used Mg additives.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 4; 85-90
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Increasing Precision and Yield in Casting Production by Simulation of the Solidification Process Based on Realistic Material Data Evaluated from Thermal Analysis (Using the ATAS MetStar System)
    Autorzy:
    Persson, P-E
    Ignaszak, Z.
    Fransson, H.
    Kropotkin, V.
    Andersson, R.
    Kump, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/382019.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ductile iron
    simulation
    defect prognosis
    density calibration
    thermal analysis
    żeliwo sferoidalne
    symulacja
    prognozowanie defektów
    kalibracja gęstości
    analiza termiczna
    Opis:
    The conducted work shows and confirms how thermal analysis of grey and ductile iron is an important source for calculating metallurgical data to be used as input to increase the precision in simulation of cooling and solidification of cast iron. The aim with the methodology is to achieve a higher quality in the prediction of macro– and micro porosity in castings. As comparison objects standard type of sampling cups for thermal analysis (solidification module M ≈ 0.6 cm) is used. The results from thermal analysis elaborated with the ATAS MetStar system are evaluated parallel with the material quality (including tendency to external and internal defects) of the tested specimen. Significant temperatures and calculated quality parameters are evaluated in the ATAS MetStar system and used as input to calibrate the density curve as temperature function in NovaFlow&Solid simulation system. The modified data are imported to the NovaFlow&Solid simulation system and compared with real results.
    Źródło:
    Archives of Foundry Engineering; 2019, 1; 109-116
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Mechanical Interactions Between the Casting and the Mold on the Conditions of Heat Dissipation: A Numerical Model
    Wpływ oddziaływań mechanicznych między odlewem a formą odlewniczą na warunki oddawania ciepła: model numeryczny
    Autorzy:
    Dyja, R.
    Gawrońska, E.
    Sczygiol, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/354252.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    shrinkage gap
    solidification process
    heat dissipation
    thermo-elastic-plastic model
    thermal resistance
    szczelina skurczowa
    proces krzepnięcia
    rozpraszanie ciepła
    model termo-sprężysto-plastyczny
    opór cieplny
    Opis:
    We present a description of the effects of thermal interactions, which take into account formation of a shrinkage gap, that affect the level of stresses in a system casting – mold. Calculations were carried out in our own computer program which is an implementation of the finite element method used to solve the equations describing a thermo-elastic-plastic model of material and the heat conduction, including solidification. In the computing algorithm we use our own criteria for mechanical interaction between the casting and mold domains. Our model of mechanical interactions between the casting and the mold allows efficient modeling of stresses occurring in the casting and an impact of development of the shrinkage gap on cooling course.
    W artykule przedstawiamy opis oddziaływań cieplnych, uwzględniający tworzącą się szczelinę skurczową, które wpływają na poziom naprężeń w układzie odlew – forma odlewnicza. Obliczenia przeprowadzono we własnym programie komputerowym będącym implementacją metody elementów skończonych użytej do rozwiązania równań opisujących termosprężysto–plastyczny model materiału oraz przewodzenia ciepła z uwzględnieniem krzepnięcia. W algorytmie obliczeniowym wykorzystujemy własne kryteria wzajemnego oddziaływania mechanicznego obszarów odlewu i formy odlewniczej. Opracowany model oddziaływań mechanicznych między odlewem a formą odlewniczą pozwala na efektywne modelowanie naprężeń powstających w odlewie oraz wpływ rozwoju szczeliny skurczowej na przebieg stygnięcia.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 3A; 1901-1907
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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