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    Tytuł:
    Identification of alloy latent heat using he data of thermal and differential analysis
    Identyfikacja utajonego ciepła krzepnięcia stopów na podstawie wyników analizy termiczno-derywacyjnej
    Autorzy:
    Mochnacki, B.
    Szopa, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/279344.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    solidification process
    latent heat identification
    numerical methods
    Opis:
    Thermal and differential analysis (TDA) is often used as a tool for quantitative estimation of solidification parameters of alloys (e.g. temperatures corresponding to the beginning and the end of phase change, kinetics of latent heat evolution, etc). TDA system offers a possibility of observation of the cooling (heating) rate, which means that the course of derivative ∂T/∂t can be analyzed. In this paper, the identification of alloy latent heat on the basis of additional information resulting from TDA measurements is discussed. At the stage of numerical modelling, the finite difference method (FDM) is used, the examples of computations are also shown.
    Analiza termiczno-derywacyjna (ATD) stanowi efektywne narzędzie ilościowej oceny parametrów krzepnięcia stopów odlewniczych (np. temperatury początku i końca krzepnięcia, kinetyki wydzielania się ciepła przemiany, itd.). Urządzenie ATD daje możliwość obserwacji krzywych stygnięcia (nagrzewania) oraz szybkości tych procesów, czyli można również obserwować zmiany pochodnej temperatury względem czasu (∂T/∂t ). W niniejszej pracy rozpatruje się zadanie dotyczące identyfikacji utajonego ciepła krzepnięcia stopów na podstawie informacji wynikających z pomiarów realizowanych urządzeniem ATD. Na etapie obliczeń numerycznych wykorzystano metodę różnic skończonych dla nieliniowych zadań nieustalonego przewodzenia ciepła. W końcowej części pracy przedstawiono wyniki identyfikacji utajonego ciepła krzepnięcia staliwa.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2011, 49, 4; 1019-1028
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    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:
    Effect of Intensive Cooling of Alloy AC-AlSi7Mg with Alloy Additions on Microstructure and Mechanical Properties
    Autorzy:
    Pisarek, B.
    Rapiejko, C.
    Pacyniak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/356173.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    aluminum alloy
    alloy additions
    intensive cooling
    mechanical properties
    Opis:
    The work presents results of the investigations of effect of intensive cooling of alloy AC-AlSi7Mg with alloy additions on microstructure and mechanical properties of the obtained casts. The experimental casts were made in ceramic molds preliminarily heated to 180°C, into which AC-AlSi7Mg with alloy additions was poured. Within implementation of the research, a comparison was made of the microstructure and mechanical properties of the casts obtained in ceramic molds cooled at ambient temperature and the ones intensively cooled in a cooling liquid. Kinetics and dynamics thermal effects recorded by the TDA method were compared. Metallographic tests were performed with the use of optical microscope and strength properties of the obtained casts were examined: UTS, Elongation and HB hardness.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 2; 677-681
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    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:
    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:
    Simulation of Dendrite Morphology and Micro-Segregation in U-Nb Alloy During Solidification
    Autorzy:
    Su, Bin
    Liu, Jing-Yuan
    Zhang, Xiao-Peng
    Yan, Xue-Wei
    Powiązania:
    https://bibliotekanauki.pl/articles/2174585.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    U-Nb alloys
    solidification process
    dendrite growth
    cellular automaton
    numerical simulation
    Opis:
    Due to the importance of uranium and uranium alloys to national defence and nuclear industrial applications, it is necessary to understand dendrite formation in their solidification structures and to control their microstructures. In this study, a modified cellular automaton model was developed to predict 2-D and 3-D equiaxed dendrite growth in U-Nb alloys. The model takes into account solute diffusion, preferential growth orientation, interface curvature, etc., and the solid fraction increment is calculated using the local level rule method. Using this model, 2-D large-scale and 3-D equiaxed dendrite growth with various crystallographic orientations in the U-5.5Nb alloy were simulated, and the Nb micro-segregation behaviour during solidification was analysed. The simulated results showed reasonable agreement with the as-cast microstructure observed experimentally.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1333--1339
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    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:
    Projekt stanowiska eksperymentalnego do badania krzepnięcia w przestrzeni walcowej
    The test stand project to analysis solidification in cylinder space
    Autorzy:
    Gortych, M.
    Gortych, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/372677.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    proces krzepnięcia
    konwekcja swobodna
    powierzchnia walcowa
    solidification process
    free convection
    cylindrical space
    Opis:
    W pracy przedstawiono projekt stanowiska eksperymentalnego do badania procesu krzepnięcia wokół powierzchni cylindrycznej. Scharakteryzowano proces konwekcji swobodnej i proces krzepnięcia wokół walca poziomego i pochylonego. Przedstawiono rozkład lokalnych wartości współczynnika przejmowania ciepła przy opływie poprzecznym walca poziomego. Przedstawiono połączenie zjawiska krzepnięcia i konwekcji swobodnej cieczy wokół przestrzeni walcowej.
    The paper presents an experimental design to test the position of the solidification process around the cylindrical surface. Characterized the convection and solidification process around the horizontal cylinder and inclined. The distribution of the local heat transfer coefficient of the flow around a transverse horizontal cylinder. A combination solidification phenomena and convection of the liquid around the cylindrical surface.
    Źródło:
    Zeszyty Naukowe. Inżynieria Środowiska / Uniwersytet Zielonogórski; 2014, 154 (34); 22-29
    1895-7323
    Pojawia się w:
    Zeszyty Naukowe. Inżynieria Środowiska / Uniwersytet Zielonogórski
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Directional solidification of ledeburite
    Autorzy:
    Trepczyńska-Łent, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/382901.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    ledeburite
    directional solidification
    structure
    interfacial distance
    proces krzepnięcia
    ledeburyt
    krzepnięcie kierunkowe
    struktura
    odległość międzyfazowa
    Opis:
    Directional solidification of ledeburite was realised out using a Bridgman’s device. The growth rate for movement sample v=83.3 μm/s was used. In one sample the solidification front was freezing. The value of temperature gradient in liquid at the solidification front was determined. Interfacial distance λ on the samples was measured with NIS-Elements application for image analysis.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 3; 101-106
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructural and Mechanical Characterization of Al-0.80Mg-0.85Si-0.3Zr Alloy
    Autorzy:
    Kahrıman, F.
    Zeren, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380758.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    heat treatment
    mechanical properties
    proces krzepnięcia
    obróbka cieplna
    właściwości mechaniczne
    Opis:
    In this study, Al-0.80Mg-0.85Si alloy was modified with the addition of 0.3 wt.-% zirconium and the variation of microstructural features and mechanical properties were investigated. In order to produce the billets, vertical direct chill casting method was used and billets were homogenized at 580 °C for 6 h. Homogenized billets were subjected to aging practice following three stages: (i) solution annealing at 550 °C for 3 h, (ii) quenching in water, (iii) aging at 180 °C between 0 and 20 h. The hardness measurements were performed for the alloys following the aging process. It was observed that peak hardness value of Al-0.80Mg-0.85Si alloy increased with the addition of zirconium. This finding was very useful to obtain aging parameters for the extruded hollow profiles which are commonly used in automotive industry. Standard tensile tests were applied to aged profiles at room temperature and the results showed that modified alloy had higher mechanical properties compared to the non-modified alloy.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 4; 73-78
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    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:
    Inoculation of grey cast iron with master alloys containing strontium and zirconium
    Autorzy:
    Soiński, M. S.
    Jędrecki, P.
    Grzesiak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/383343.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    cast iron
    inoculation
    mechanical properties
    proces krzepnięcia
    żeliwo szare
    właściwości mechaniczne
    Opis:
    The effectiveness of cast iron inoculation performed by means of three various inoculants: FeSiSr–SYSTR 75 AV, FeSiZr–SYZR 25 AV and Zircinoc was determined. The inoculants were introduced to the cast iron during the pouring of production moulds. Examination of cast iron structure and mechanical properties were carried out for specimens cut out of the collars of the cast valve bodies. It was found that the quantity of eutectic cells increased to the greatest degree if FeSiZr–SYZR 25 AV inoculant was applied in quantities of 0.20% or 0.25%. This inoculant in the mentioned quantities also increases the tensile strength to the greatest degree, rising it to the level of 250-265 MPa.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 3 spec.; 195-198
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected Principles of Feeding Systems Design: Simulation vs Industrial Experience
    Autorzy:
    Perzyk, M.
    Kochański, A.
    Mazurek, P.
    Karczewski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/379595.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    castings defects
    simulation software
    feeding flow
    krzepnięcie
    wady odlewów
    przepływ
    oprogramowanie
    Opis:
    Simulation software dedicated for design of casting processes is usually tested and calibrated by comparisons of shrinkage defects distribution predicted by the modelling with that observed in real castings produced in a given foundry. However, a large amount of expertise obtained from different foundries, including especially made experiments, is available from literature, in the form of recommendations for design of the rigging systems. This kind of information can be also used for assessment of the simulation predictions. In the present work two parameters used in the design of feeding systems are considered: feeding ranges in horizontal and vertical plates as well as efficiency (yield) of feeders of various shapes. The simulation tests were conducted using especially designed steel and aluminium castings with risers and a commercial FDM based software. It was found that the simulations cannot predict appearance of shrinkage porosity in horizontal and vertical plates of even cross-sections which would mean, that the feeding ranges are practically unlimited. The yield of all types of feeders obtained from the simulations appeared to be much higher than that reported in the literature. It can be concluded that the feeding flow modelling included in the tested software does not reflect phenomena responsible for the feeding processes in real castings properly. Further tests, with different types of software and more fundamental studies on the feeding process modelling would be desirable.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 4; 77-82
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Boron on Crystallization and Microstructure of Ductile Cast Iron
    Autorzy:
    Dojka, R.
    Studnicki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/379815.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    metallography
    ductile cast iron
    boron
    TDA
    proces krzepnięcia
    metalografia
    żeliwo sferoidalne
    bor
    Opis:
    The objective of the research was to determine the influence of boron on the crystallization process and microstructure of ductile cast iron. In the case of ductile cast iron it is a vital issue because even as little as trace presence of boron changes the properties of ductile cast iron in a significant way. With the use of a new ATD-4 (TDA) tester and CRYSTALDIGRPAH converter it was possible to measure the crystallization process parameters of the same alloy with four different contents of boron in one mould. Four samples with different boron contents were extracted, their microhardness was measured and quantitative analysis of microstructure was conducted. Obtained results allowed to state that with increasing content of boron the amount of graphite precipitates decreases, the amount of pearlite precipitates increases, the shape of graphite precipitates deteriorates and hardness increases. It is also planned to perform additional testings with boron contents between previously tested values.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 2; 15-20
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Gadolinium on the Microstructure of Magnesium Alloy AZ91
    Autorzy:
    Rapiejko, Cezary
    Mikusek, D.
    Just, P.
    Pacyniak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837784.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metallography
    solidification process
    magnesium alloys
    gadolinium
    DTA process
    metalografia
    proces krzepnięcia
    stopy magnezu
    gadolin
    proces DTA
    Opis:
    The paper presents the results of research related to the possibility of inoculation of the AZ91 magnesium alloy casted into ceramic moulds by gadolinium. Effects of gadolinium content (0.1–0.6 wt%) on microstructure of the AZ91 alloy under as-cast state were investigated. The influence of the inoculator on the formation of the microstructure investigated by means of the thermal and derivative analysis by analysing the thermal effects arising during the alloy crystallization resulting from the phases formed. The degree of fragmentation of the microstructure of the tested alloys was assessed by means of the light microscopy studies and an image analysis with statistical analysis was performed. Conducted analyses have aimed at examining on the effect of inoculation of the gadolinium on the differences between the grain diameters and average size of each type of grain by way of measuring their perimeters of all phases, preliminary αMg and eutectics αMg+γ(Mg17Al12) in the prepared examined material.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 1; 31-36
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Gadolinium on the Microstructure of Magnesium Alloy AZ91
    Autorzy:
    Rapiejko, C.
    Mikusek, D.
    Just, P.
    Pacyniak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837850.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metallography
    solidification process
    magnesium alloys
    gadolinium
    DTA process
    metalografia
    proces krzepnięcia
    stopy magnezu
    gadolin
    proces DTA
    Opis:
    The paper presents the results of research related to the possibility of inoculation of the AZ91 magnesium alloy casted into ceramic moulds by gadolinium. Effects of gadolinium content (0.1–0.6 wt%) on microstructure of the AZ91 alloy under as-cast state were investigated. The influence of the inoculator on the formation of the microstructure investigated by means of the thermal and derivative analysis by analysing the thermal effects arising during the alloy crystallization resulting from the phases formed. The degree of fragmentation of the microstructure of the tested alloys was assessed by means of the light microscopy studies and an image analysis with statistical analysis was performed. Conducted analyses have aimed at examining on the effect of inoculation of the gadolinium on the differences between the grain diameters and average size of each type of grain by way of measuring their perimeters of all phases, preliminary αMg and eutectics αMg+γ(Mg17Al12) in the prepared examined material.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 1; 31-36
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Inoculant Emgesal® Flux 5 on the Microstructure of Magnesium Alloy AZ91
    Autorzy:
    Rapiejko, C.
    Mikusek, D.
    Andrzejczak, A.
    Pacyniak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/380314.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metallography
    solidification process
    magnesium alloys
    Emgesal® Flux 5
    DTA process
    metalografia
    proces krzepnięcia
    stopy magnezu
    testy DTA
    Opis:
    This work presents the results of the research of the effect of the inoculant Emgesal Flux 5 on the microstructure of the magnesium alloy AZ91. The concentration of the inoculant was increased in samples in the range from 0.1% to 0.6%. The thermal processes were examined with the use of Derivative and Thermal Analysis (DTA). During the examination, the DTA samplers were preheated up to 180 °C. A particular attention was paid to finding the optimum amount of inoculant, which would cause fragmentation of the microstructure. The concentration of each element was verified by means of a spark spectrometer. In addition, the microstructures of the samples were examined with the use of an optical microscope, and an image analysis with a statistical analysis using the NIS-Elements program were carried out. Those analyses aimed at examining the differences between the grain diameters of phase αMg and eutectic αMg+γ(Mg17Al12) in the prepared samples as well as the average size of each type of grain by way of measuring their perimeters. This paper is an introduction to a further research of grain refinement in magnesium alloys, especially AZ91. Another purpose of this research is to achieve better micro-structure fragmentation of magnesium alloys without the related changes of the chemical composition, which should improve the mechanical properties.
    Źródło:
    Archives of Foundry Engineering; 2019, 2; 15-20
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Inoculation on the Mechanical Properties of AZ91
    Autorzy:
    Rapiejko, Cezary
    Mikusek, D.
    Kubiak, Krzysztof
    Pacyniak, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/27314149.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    metallography
    solidification process
    magnesium alloys
    Emgesal® Flux 5
    DTA process
    metalografia
    proces krzepnięcia
    stopy magnezu
    proces DTA
    Opis:
    The effect of Ca element on the microstructure evolution of the AZ91 magnesium alloy was investigated in this research. The magnesium-aluminium alloy AZ91 was inoculated with the Emgesal® Flux 5 to refine its microstructure and also improve its microstructure. Six different concentrations of the Emgesal® Flux 5 content were tested, ranging from 0.1 to 0.6% wt., and compared to the baseline of the AZ91 alloy without inoculation. Melted metal was poured into a preheated metallic mould. Samples to test were achieved after turning treatment. Formed microstructure was assessed using an optical microscope. The microstructure was refined for every tested samples. Mechanical properties such as tensile strength, elongation, Brinell hardness, Vickers microhardness, abrasion resistance and adhesive resistance were tested on the inoculated samples and compared to the non-inoculated AZ91. Introducing an Emgesal®Flux 5 inoculant caused a change in the tensile strength, elongation, Brinell hardness, Vickers microhardness, abrasive wear resistance as well as adhesive wear resistance in each examined concentration.
    Źródło:
    Archives of Foundry Engineering; 2023, 23, 2; 15--20
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    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:
    Numerical modelling of liquid material flow in the fusion zone of hybrid welded joint
    Modelowanie numeryczne ruchu ciekłego materiału w strefie przetopienia złącza spawanego hybrydowo
    Autorzy:
    Kubiak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/379665.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    hybrid welding
    fluid flow
    numerical modelling
    proces krzepnięcia
    spawanie hybrydowe
    przepływ cieczy
    modelowanie numeryczne
    Opis:
    This paper concerns modelling of liquid metal motion in the fusion zone of laser-arc hybrid butt-welded plate. Velocity field in the fusion zone and temperature field in welded plate were obtained on the basis of the solution of mass, momentum and energy conservations equations. Differential equations were solved using Chorin’s projection method and finite volume method. Melting and solidification processes were taken into account in calculations assuming fuzzy solidification front where fluid flow is treated as a flow through porous medium. Double-ellipsoidal heat source model was used to describe electric arc and laser beam heat sources. On the basis of developed solution algorithms simulation of hybrid welding process was performed and the influence of liquid metal motion in the fusion zone on the results of calculations was analyzed.
    Praca dotyczy modelowania ruchu ciekłego metalu w strefie przetopienia złącza spawanego doczołowo techniką hybrydową laser-łuk elektryczny. Pole prędkości w strefie przetopienia i pole temperatury w spawanym płaskowniku otrzymano z rozwiązania równań zachowania masy, pędu i energii. Do rozwiązania równań różniczkowych wykorzystano projekcję Chorina i metodę objętości skończonych. W obliczeniach uwzględniono procesy topienia i krzepnięcia złącza z założeniem rozmytego frontu krzepnięcia gdzie ruch cieczy traktowano jako przepływ przez medium porowate. Do opisu rozkładu mocy łuku elektrycznego i wiązki laserowej wykorzystano „podwójnie elipsoidalny” model źródła ciepła. Na podstawie opracowanych algorytmów przeprowadzono symulację procesu spawania hybrydowego analizując wpływ ruchu ciekłego metalu w strefie przetopienia na wyniki obliczeń.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 2 spec.; 117-123
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solution of the Pure Metals Solidification Problem by Involving the Material Shrinkage and the Air-Gap Between Material and Mold
    Autorzy:
    Matlak, J.
    Słota, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/381022.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    air-gap
    Stefan problem
    metal shrinkage
    proces krzepnięcia
    szczelina powietrzna
    problem Stefana
    skurcz stopu
    Opis:
    In this paper we describe an algorithm for solving the pure metals solidification problem by involving the metal shrinkage and air-gap between material and mold. In this algorithm we use the finite element method supplemented by the procedures allowing to define the position of the moving interface and the change of the material size associated with the shrinkage. We present also an example illustrating the precision of presented method.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 3 spec.; 47-52
    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:
    Optimization of Side Feeders Systems by Means of Simulation of Solidification
    Autorzy:
    Perzyk, M.
    Kozlowski, J.
    Mazur, M.
    Szymczewski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/382649.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    castings defect
    side feeders
    simulation
    design rules
    proces krzepnięcia
    wada odlewu
    podajnik
    zasady projektowania
    Opis:
    Simulation software can be used not only for checking the correctness of a particular design but also for finding rules which could be used in majority of future designs. In the present work the recommendations for optimal distance between a side feeder and a casting wall were formulated. The shrinkage problems with application of side feeders may arise from overheating of the moulding sand layer between casting wall and the feeder in case the neck is too short as well as formation of a hot spot at the junction of the neck and the casting. A large number of simulations using commercial software were carried out, in which the main independent variables were: the feeder’s neck length, type and geometry of the feeder, as well as geometry and material of the casting. It was found that the shrinkage defects do not appear for tubular castings, whereas for flat walled castings the neck length and the feeders’ geometry are important parameters to be set properly in order to avoid the shrinkage defects. The rules for optimal lengths were found using the Rough Sets Theory approach, separately for traditional and exothermic feeders.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1; 69-74
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    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:
    Effect of Mischmetal on the Microstructure of the Magnesium Alloy AZ91
    Autorzy:
    Mikusek, D.
    Rapiejko, C.
    Walisiak, D.
    Pacyniak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/379653.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metallography
    solidification process
    magnesium alloys
    alloy additives
    mischmetal
    DTA process
    metalografia
    proces krzepnięcia
    stopy magnezu
    dodatki stopowe
    miszmetal
    proces DTA
    Opis:
    In this paper is discussed the effect of the inoculant mischmetal addition on the microstructure of the magnesium alloy AZ91. The concentration of the inoculant was increased in the samples within the range from 0.1% up to 0.6%. The thermal process was performed with the use of Derivative and Thermal Analysis (DTA). A particular attention was paid to finding the optimal amount of the inoculant, which causes fragmentation of the microstructure. The concentration of each element was verified with use of a spark spectrometer. In addition, the microstructures of every samples were examined with the use of an optical microscope and also was performed an image analysis with a statistical analysis using the NIS - Elements program. The point of those analyses was to examine the differences in the grain diameters of phase αMg and eutectic αMg+γ(Mg17Al12) in the prepared samples as well as the average size of each type of grain by way of measuring their perimeters. This paper is the second part of the introduction into a bigger research on grain refinement of magnesium alloys, especially AZ91. Another purpose of this research is to achieve better microstructure fragmentation of magnesium alloys without the relevant changes of the chemical composition, which should improve the mechanical properties.
    Źródło:
    Archives of Foundry Engineering; 2019, 4; 45-50
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Characterization of Rapidly Solidified Al71Ni24Fe5 Alloy
    Autorzy:
    Młynarek, Katarzyna
    Czeppe, T.
    Babilas, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079835.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    mechanism of crystallization
    rapid solidification
    quasicrystalline structure
    aluminium alloys
    proces krzepnięcia
    mechanizm krystalizacji
    szybkie krzepnięcie
    struktura quasikrystaliczna
    stopy aluminium
    Opis:
    The influence of rapid solidification from the liquid state on the structure of Al71Ni24Fe5 alloy was studied. The samples were prepared by induction melting (ingots) and high pressure die casting into a copper mold (plates). The structure was examined by X-ray diffraction (XRD), light microscopy and high resolution transmission electron microscopy (HRTEM). The mechanism of crystallization was described on the basis of differential scanning calorimetry (DSC) heating and cooling curves, XRD patterns, isothermal section of Al-Ni-Fe alloys at 850°C and binary phase diagram of Al-Ni alloys. The fragmentation of the structure was observed for rapidly solidified alloy in a form of plates. Additionally, the presence of decagonal quasicrystalline phase D-Al70.83Fe9.83Ni19.34 was confirmed by phase analysis of XRD patterns, Fast Fourier Transform (FFT) and Inverse Fast Fourier Transform (IFFT) of transmission electron microscopy images. The metastable character of D-Al70.83Fe9.83Ni19.34 phase was observed because of the lack of thermal effects on the DSC curves. The article indicates the differences with other research works and bring up to date the knowledge about Al71Ni24Fe5 alloys produced by two different cooling rates.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 3; 90--95
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Complex Reagent Efficiency in Reduction of Copper from the Slags in Conditions of the Smelter & Refinery Plant - Głogów
    Autorzy:
    Wołczyński, W.
    Migas, P.
    Bydałek, A. W.
    Najman, K.
    Senderowski, C.
    Kwapisiński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/382620.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    copper droplets
    complex reagent
    slag
    thermo-chemical treatment
    krzepnięcie
    miedź
    odczynniki
    żużel
    obróbka cieplno-chemiczna
    Opis:
    The copper droplets contained in the post-processing liquid slag are subjected to the treatment by the complex reagent. The complex reagent has been recently elaborated and patented in frame of the Grant No. PBS3/A5/45/2015. In particular, the complex reagent is dedicated to the post-processing slags coming from the Smelter and Refinery Plant, Głogów, as a product of the direct-to-blister technology performed in the flash furnace. The recently patented complex reagent effectively assists not only in agglomeration, and coagulation but also in the deposition of the copper droplets at the bottom of crucible / furnace as well. The treatment of the post-processing slags by the complex reagent was performed in the BOLMET S.A. Company as in the industrial conditions which were similar to those usually applied in the KGHM – Polish Copper (Smelter and Refinery Plant, Głogów). The competition between buoyancy force and gravity is studied from the viewpoint of the required deposition of coagulated copper droplets. The applied complex reagent improves sufficiently the surface free energy of the copper droplets. In the result, the mechanical equilibrium between coagulated copper droplets and surrounding liquid slag is properly modified. Finally, sufficiently large copper droplets are subjected to a settlement on the crucible / furnace bottom according to the requirements.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 3; 86-90
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification Mechanism and Growth Process of Al3(Sc, Zr) Particles in As-cast Al-Si-Mg-Cu-Zr-Sc Alloy
    Autorzy:
    Li, Y.
    Du, X.
    Fu, J.
    Zhang, Y.
    Zhang, Z.
    Zhou, S.
    Wu, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/382672.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    Al3(Sc, Zr)
    three-dimensional morphology
    eutectic growth
    krzepnięcie stopu
    morfologia trójwymiarowa
    wzrost eutektyczny
    Opis:
    In this study, the modification mechanism and growth process of Al3(Sc, Zr) particles in as-cast Al-Si-Mg-Cu based alloy with addition of Sc and Zr were systematically investigated. It was found that 0.57 wt-%Sc addition caused a significant refinement in the average grain size of the investigated alloy, which brought about a remarkable transformation in as-cast microstructure, from thick dendritic shape to fine equiaxed structure. A large amount of primary Al3(Sc, Zr) particles with the dimension of around 5-6 μm were also observed within the equiaxed grain. Due to the identical orientation and similar crystal structure between primary Al3(Sc, Zr) particles and α-Al matrix, the primary particles always served as heterogeneous nucleus for the α-Al matrix. In addition, these cusped cubic primary Al3(Sc, Zr) particles showed triangle, star, rhomboid morphologies are generated from sectioning the particle in (111), (100) and (110) planes, respectively. Particularly, the typical eutectic structure which contained odd number-layer (Al3(Sc, Zr)+α-Al+ ... +Al3(Sc, Zr)) was observed within the investigated particles.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 2; 51-56
    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:
    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:
    Surface Hardening of Nodular Cast Iron by GTAW Remelting
    Autorzy:
    Orłowicz, A. W.
    Trytek, A.
    Korzeniowski, M.
    Kupiec, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/379624.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    mechanical properties
    nodular cast iron
    GTAW process
    surface layer
    proces krzepnięcia
    właściwości mechaniczne
    żeliwo sferoidalne
    proces GTAW
    warstwa powierzchniowa
    Opis:
    The study reported in this paper was aimed at establishing the effect of values of parameters characterizing the process of superficial remelting of a nodular iron casting on the quantity of introduced heat, geometry of remeltings as well as parameter λ and hardness of cementite eutectic. The remelting process was carried out using GTAW method, at electric arc length of 3 mm in argon atmosphere, welding current intensities I = 50, 130, 210, and 300 A, and electric arc scanning speeds vs = 200, 400, and 800 mm/min. The measurements included estimation of the quantity of heat introduced to the casting in the electric arc-induced remelting process with the use of flow calorimeter. Widths and depths of remetlings were assessed with the use of metallographic method. As a result of fast solidification, cementite eutectic was obtained in remelted material in which, in the course of cooling down to ambient temperature, austenite was subject to partial transformation into martensite. To characterize the cementite eutectic, value of the structural parameter λ was assessed. Values of the parameter were similar for areas of occurrence of both fibrous and laminated eutectic. Remeltings were examined at half of their depths. Micro-hardness measurements were taken in the same areas. The established quantitative relationships may prove to be useful in practice for the purpose of predicting values of parameter λ and hardness of remeltings in studies aimed at improving resistance of cast-iron castings to abrasive wear.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 3; 53-58
    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:
    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:
    The Cracking Mechanism of Ferritic- Austenitic Cast Steel
    Autorzy:
    Stradomski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/383172.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    duplex cast steel
    hot cracking
    solidification process
    sigma phase
    staliwo duplex
    pękanie na gorąco
    proces krzepnięcia
    faza sigma
    Opis:
    In the high-alloy, ferritic - austenitic (duplex) stainless steels high tendency to cracking, mainly hot-is induced by micro segregation processes and change of crystallization mechanism in its final stage. The article is a continuation of the problems presented in earlier papers [1-4]. In the range of high temperature cracking appear one mechanism a decohesion - intergranular however, depending on the chemical composition of the steel, various structural factors decide of the occurrence of hot cracking. The low-carbon and low-alloy cast steel casting hot cracking cause are type II sulphide, in high carbon tool cast steel secondary cementite mesh and/or ledeburite segregated at the grain solidified grains boundaries, in the case of Hadfield steel phosphorus - carbide eutectic, which carrier is iron-manganese and low solubility of phosphorus in high manganese matrix. In duplex cast steel the additional factor increasing the risk of cracking it is very "rich" chemical composition and related with it processes of precipitation of many secondary phases.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 4; 153-156
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Integrated Analytical and Measurement System for the Evaluation of the Properties of Cast Metals and Alloys
    Autorzy:
    Biernat, S.
    Bydałek, A. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/380877.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry industry
    application of information technology
    solidification process
    brass
    hardness
    przemysł odlewniczy
    zastosowanie technologii informatycznych
    krzepnięcie
    mosiądz
    twardość
    Opis:
    The article presents an integrated analytical and measurement system for evaluation of the properties of cast metals and alloys. The presented platform is an extension of the SLAG - PROP application with new modules, which allow to use information on metallurgical processes in an even more effective way, as well as to evaluate the finished product. In addition, the construction of a measuring station for the analysis of thermal processes taking place in a metal bath allows for precise observation of phenomena together with their appropriate interpretation. The article presents not only the cooling curves of certain copper alloys. The analysis also covered mechanical properties related to hardness, finished products depending on the mold in which the products were cast. In the literature one can find information about the mechanical properties of products in the improved state, usually after plastic or thermal treatment, omitting their properties obtained as a result of a naturally made casting. The article also presents the method of placing information in the database using a convenient graphical tool.
    Źródło:
    Archives of Foundry Engineering; 2019, 1; 13-18
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Production of Material with Ultrafine Grain Structure in Al-Zn Alloy in the Process of Rapid Solidification
    Autorzy:
    Szymanek, M.
    Augustyn, B.
    Kapinos, D.
    Boczkal, S.
    Nowak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/381375.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technologies
    innovative foundry materials
    aluminium alloys
    solidification process
    Rapid Solidification
    innowacyjne technologie odlewnicze
    innowacyjne materiały w odlewnictwie
    stopy aluminium
    krzepnięcie
    szybkie krzepnięcie
    Opis:
    In the aluminium alloy family, Al-Zn materials with non-standard chemical composition containing Mg and Cu are a new group of alloys, mainly owing to their high strength properties. Proper choice of alloying elements, and of the method of molten metal treatment and casting enable further shaping of the properties. One of the modern methods to produce materials with submicron structure is a method of Rapid Solidification. The ribbon cast in a melt spinning device is an intermediate product for further plastic working. Using the technique of Rapid Solidification it is not possible to directly produce a solid structural material of the required shape and length. Therefore, the ribbon of an ultrafine grain or nanometric structure must be subjected to the operations of fragmentation, compaction, consolidation and hot extrusion. In this article the authors focussed their attention on the technological aspect of the above mentioned process and described successive stages of the fabrication of an AlZn9Mg2.5Cu1.8 alloy of ultrafinegra in structure designated for further plastic working, which enables making extruded rods or elements shaped by the die forging technology. Studies described in the article were performed under variable parameters determined experimentally in the course of the alloy manufacturing process, including casting by RS and subsequnt fragmentation.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 2; 57-62
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Zr on AlSi9Cu1Mg Alloy Cast in Ceramic
    Autorzy:
    Matejka, M.
    Kuriš, M.
    Bolibruchova, D.
    Pastirčák, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/382580.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    heat treatment
    aluminium alloys
    properties
    zirconium
    ceramic mould
    proces krzepnięcia
    stop aluminium
    wpływ cyrkonu
    obróbka cieplna
    forma ceramiczna
    Opis:
    The article focuses on the analysis of the effect of Zr on the properties of the aluminium alloy AlSi9Cu1Mg. The effect of Zr was evaluated depending on the change in mechanical properties and heat resistance during a gradual addition of Zr with an increase of 0.05 wt. % Zr. Half of the cast experimental samples from each variant were heat treated by precipitation hardening T6 (hereinafter HT). The measured values in both states indicate an improvement of the mechanical properties, especially in the experimental variants with a content of Zr ≥ 0.20 wt. %. In the evaluation of Rm, the most significant improvement occurred in the experimental variant with an addition of Zr 0.25 wt. % after HT and E in the experimental variant with addition of Zr 0.20 wt. % after HT. Thus, a difference was found from the results of the authors defining the positive effect of Zr, in particular at 0.15 wt. %. When evaluating the microstructure of the AlSi9Cu1Mg alloy after Zr alloying, Zr phases are already eliminated with the addition of Zr 0.10 wt. %. Especially at higher levels of Zr ≥ 0.20 wt. %, long needle phases with slightly cleaved morphology are visible in the metal matrix. It can be stated that a negative manifestation of Zr alloying is expressed by an increase in gassing of experimental alloys, especially in variants with a content of Zr ≥ 0.15 wt. %. Experimental samples were cast into ceramic moulds. The development of an experimental alloy AlSi9Cu1Mg alloyed with Zr would allow the production of a more sophisticated material applicable to thin-walled Al castings capable of operating at higher temperature loads.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 2; 13-18
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methodology of Comparative Validation of Selected Foundry Simulation Codes
    Autorzy:
    Ignaszak, Z.
    Popielarski, P.
    Hajkowski, J.
    Codina, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/379771.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    castings defect
    simulation codes
    cast iron
    macromodel
    micro model
    proces krzepnięcia
    wada odlewu
    żeliwo
    model makro
    model mikro
    Opis:
    The validation of each simulation code used in foundry domain requires individual approach due to its specificity. This validation can by elaborated on the basis of experimental results or in particular cases by comparison the simulation results from different codes. The article concerns the influence of grey cast iron density curve and different forms of solid fraction curve Fs=f(T) on the formation of shrinkage discontinuities. Solid fraction curves applying Newtonian Thermal Analysis (NTA) were estimated. The experimental and numerical simulation tests were performed on the castings, which were made with Derivative Thermal Analysis (DerTA) standard cups. The numerical tests were realized using NovaFlow&Solid (NF&S), ProCast and Vulcan codes. In this work, the coupled influence of both curves on the dynamics of the shrinkage-expansion phenomena and on shrinkage defects prognosis in grey cast iron castings has been revealed. The final evaluation of the simulation systems usefulness should be based on validation experiment, preceded by comparing the simulation results of available systems which are proposed in given technology.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 4; 37-44
    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:
    Heat Treatment of the SiMo Iron Castings - Case Study in the Automotive Foundry
    Autorzy:
    Cygan, B.
    Stawarz, M.
    Jezierski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/379738.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat treatment
    solidification process
    SiMo cast iron
    exhaust manifold
    automotive parts
    obróbka termiczna
    proces krzepnięcia
    żeliwo SiMo
    kolektor wydechowy
    części samochodowe
    Opis:
    Silicon – molybdenum cast iron commonly called SiMo due to its unique properties has becoming more and more interesting engineering material. The history and development of this alloy is relatively long but, due to the significant difficulties during the manufacturing process resulting in the lower final quality than expected, it has not been applied to often in practice. The biggest challenge is its brittleness as a result of the carbides precipitations. During last few years, thanks to the many important researches made and the general foundry technology development, the interest in SiMo iron has been rapidly growing, especially for the castings for heavy duty applications like corrosion, high temperature and wear abrasion resistant parts. In the article the heat treatment attempts to improve the microstructure of SiMo castings has been presented. The goal was to destroy or at least to refine and uniformly distribute the carbides precipitations to improve mechanical properties of the exhaust manifold castings for the cars. The experiments were carried out for the alloy contains approx. 4% Si, 1% Mo and 3.2%C. The range of the research included: hardness measuring, standard mechanical properties and microstructure for as-cast state and after that the subsequent heat treatment process with another properties check. The result of the heat treatment was the elimination of pearlite from the metal matrix. Moreover, the changes of the carbide molybdenum – rich phase morphology were observed. The dispersion of the carbides precipitations in the carbides area was observed. The experiments proved the possibility to control the microstructure and the mechanical properties of the SiMo castings by means of heat treatment but only to some extent.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 4; 103-109
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computer Simulation of the Solidification Process Including Air Gap Formation
    Autorzy:
    Skrzypczak, T.
    Węgrzyn-Skrzypczak, E.
    Sowa, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/383120.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    computer simulation
    finite element method
    multimesh approach
    air gap
    proces krzepnięcia
    symulacja komputerowa
    metoda elementów skończonych
    podejście wielowymiarowe
    szczelina powietrzna
    Opis:
    The paper presents an approach of numerical modelling of alloy solidification in permanent mold and transient heat transport between the casting and the mold in two-dimensional space. The gap of time-dependent width called "air gap", filled with heat conducting gaseous medium is included in the model. The coefficient of thermal conductivity of the gas filling the space between the casting and the mold is small enough to introduce significant thermal resistance into the heat transport process. The mathematical model of heat transport is based on the partial differential equation of heat conduction written independently for the solidifying region and the mold. Appropriate solidification model based on the latent heat of solidification is also included in the mathematical description. These equations are supplemented by appropriate initial and boundary conditions. The formation process of air gap depends on the thermal deformations of the mold and the casting. The numerical model is based on the finite element method (FEM) with independent spatial discretization of interacting regions. It results in multi-mesh problem because the considered regions are disconnected.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 4; 147-150
    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:
    Effect of alloying elements on solidification of primary austenite in Ni-Mn-Cu cast iron
    Autorzy:
    Janus, A.
    Kurzawa, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/382123.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    primary austenite
    solidification process
    austenitic cast iron
    Ni-Mn-Cu cast iron
    austenit pierwotny
    proces krzepnięcia
    żeliwo austenityczne
    żeliwo Ni-Mn-Cu
    Opis:
    Within the research, determined were direction and intensity of alloying elements influence on solidification way (directional or volumetric) of primary austenite dendrites in hypoeutectic austenitic cast iron Ni-Mn-Cu. 50 cast shafts dia. 20 mm were analysed. Chemical composition of the alloy was as follows: 1.7 to 3.3 % C, 1.4 to 3.1 % Si, 2.8 to 9.9 % Ni, 0.4 to 7.7 % Mn, 0 to 4.6 % Cu, 0.14 to 0.16 % P and 0.03 to 0.04 % S. The discriminant analysis revealed that carbon influences solidification of primary austenite dendrites most intensively. It clearly increases the tendency to volumetric solidification. Influence of the other elements is much weaker. This means that the solidification way of primary austenite dendrites in hypoeutectic austenitic cast iron Ni-Mn-Cu does not differ from that in an unalloyed cast iron.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 2 spec.; 93-96
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dual Phase Lag Model of Melting Process in Domain of Metal Film Subjected to an External Heat Flux
    Autorzy:
    Mochnacki, B.
    Ciesielski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/382640.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theoretical basis
    foundry process
    solidification process
    microscale heat transfer
    dual phase lag model
    control volume method
    podstawy teoretyczne
    proces odlewania
    proces krzepnięcia
    wymiana ciepła
    model dwufazowy
    Opis:
    Heating process in the domain of thin metal film subjected to a strong laser pulse are discussed. The mathematical model of the process considered is based on the dual-phase-lag equation (DPLE) which results from the generalized form of the Fourier law. This approach is, first of all, used in the case of micro-scale heat transfer problems (the extremely short duration, extreme temperature gradients and very small geometrical dimensions of the domain considered). The external heating (a laser action) is substituted by the introduction of internal heat source to the DPLE. To model the melting process in domain of pure metal (chromium) the approach basing on the artificial mushy zone introduction is used and the main goal of investigation is the verification of influence of the artificial mushy zone ‘width’ on the results of melting modeling. At the stage of numerical modeling the author’s version of the Control Volume Method is used. In the final part of the paper the examples of computations and conclusions are presented.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 4; 85-90
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Meta-stable solidification created by the detonation method of coating formation
    Autorzy:
    Wołczyński, W.
    Garzeł, G.
    Morgiel, J.
    Senderowski, C.
    Pawłowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/382812.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    krystalizacja
    krzepnięcie szybkie
    powłoka Fe-Al
    faza amorficzna
    theory of crystallization
    rapid solidification process
    Fe-Al coating
    meta-stable phase diagram
    amorphous phase
    Opis:
    Particles of the Fe-Al type (less than 50 m in diameter) were sprayed onto the 045 steel substrate by means of the detonation method. The TEM, SAED and EDX analyses revealed that the Fe-Al particles have been partially melted in the experiment of coating formation. Particle undergone melting even within about 80% of its volume. Therefore, solidification of the melted part of particles was expected. Solidification differed significantly due to a large range of chemical composition of applied particles (from 15 at.% Al up to 63 at.% Al). A single particle containing 63 at.% Al was subjected to the detailed analysis, only. The TEM / SAED techniques revealed in the solidified part of particle three sub-layers: an amorphous phase, [...] , periodically situated FeAl + Fe2Al5 phases, and a non-equilibrium phase, [...]. A hypothesis dealing with the inter-metallic phases formation in such a single particle of the nominal composition No = 0.63 is presented. At first, the solid / liquid system is treated as an interconnection: substrate / liquid / nonmelted particle part . Therefore, it is suggested that the solidification occurs simultaneously in two directions: towards a substrate and towards a non-melted part of particle. The solidification mechanism is referred to the Fe-Al meta-stable phase diagram. It is shown that the melted part of particle solidifies rapidly according to the phase diagram of meta-stable equilibrium and at a significant deviation from the thermodynamic equilibrium.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 2; 93-96
    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:
    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:
    Numerical Model of Solidification Including Formation of Multiple Shrinkage Cavities
    Autorzy:
    Skrzypczak, T.
    Sowa, L.
    Węgrzyn-Skrzypczak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/379500.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    castings defects
    shrinkage cavity
    numerical simulation
    finite element method
    proces krzepnięcia
    wady odlewów
    ubytki skurczowe
    symulacja numeryczna
    metoda elementów skończonych
    Opis:
    Presented paper shows the mathematical and numerical approaches for modelling of binary alloy solidification solved by the Finite Element Method (FEM). The phenomenon of shrinkage cavities formation process is included in the numerical model. Multiple macroscopic cavities can be modelled within the single casting volume. Solid, liquid and gaseous phases with different material properties are taken into account during solidification process. Mathematical model uses the differential equation of heat diffusion. Modification of specific heat is used to describe the heat releasing during liquid-solid phase change. Numerical procedure of shrinkage cavities evolution is based on the recognition of non-connected liquid volumes and local shrinkage computation in the each of them. The recognition is done by the selection of sets of interconnected nodes containing liquid phase in the finite element mesh. Original computer program was developed to perform calculation process. Obtained results of temperature and shrinkage cavities distributions are presented and discussed in details.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 1; 37-42
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intermetallic Phases in Alloyed Cast Iron with 18%Si Addition
    Autorzy:
    Stawarz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/946866.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theory of crystallization
    solidification process
    intermetallic phases
    spheroidal graphite
    silicon cast iron
    teoria krystalizacji
    proces krzepnięcia
    fazy międzymetaliczne
    grafit sferoidalny
    żeliwo silikonowe
    Opis:
    The paper presents an analysis of a selected grade of high silicon cast iron intended for work in corrosive and abrasive conditions. The text describes its microstructure taking into account the process of crystallization, TDA analysis, EDS, XRD and the chemical composition analysis. In order to determine the phase composition, X-ray diffraction tests were carried out. The tests were executed on a Panalytical X'Pert PRO X-ray diffractometer with filtration of radiation from a lamp with copper anode and PIXcel 3D detector on the deflected beam axis. Completed tests allowed to describe the microstructure with detailed consideration of intermetallic phases present in the alloy. Results of the analysis of the examined alloy clearly show that we deal with intermetallic phases of Fe3Si, Fe5Si3 types, as well as silicon ferrite and crystals of silicon. In the examined alloy, we observed the phenomenon of segregation of carbon, which, as a result of this process, enriches the surface of silicon crystals, not creating a compound with it. Moreover, the paper demonstrates capability for crystallization of spheroidal graphite in the examined alloy despite lack of elements that contribute to balling in the charge materials.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 2; 37-42
    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
    Tytuł:
    Experimental Verification of the Cast Iron Solidification Model
    Autorzy:
    Mendakiewicz, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/2174627.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry industry
    application of information technology
    solidification process
    numerical techniques
    thermal analysis
    derivative analysis
    przemysł odlewniczy
    zastosowanie technologii informatycznych
    krzepnięcie
    techniki numeryczne
    analiza termiczna
    Opis:
    The article concerns the experimental verification of the numerical model simulating the solidification and cooling processes proceeding in the domain of cast iron casting. The approximate course of the function describing the evolution of latent heat and the value of substitute specific heat resulting from its course were obtained using the thermal and derivative analysis (TDA) method The TDA was also used to measure the cooling curves at the distinguished points of the casting. The results obtained in this way were compared with the calculated cooling curves at the same points. At the stage of numerical computations, the explicit scheme of the finite difference method was applied. The agreement between the measured and calculated cooling curves is fully satisfactory.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 3; 91--94
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    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:
    Definition of alloy substitute thermal capacity using the simple macrosegregation models
    Autorzy:
    Mochnacki, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/380456.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    technologia informatyczna
    przemysł odlewniczy
    proces krzepnięcia
    zastępcza pojemność cieplna
    metody numeryczne
    information technology
    foundry industry
    solidification process
    one domain method
    substitute thermal capacity
    numerical methods
    Opis:
    Mathematical description of alloys solidification in a macro scale can be formulated using the one domain method (fixed domain approach). The energy equation corresponding to this model contains the parameter called a substitute thermal capacity (STC). The analytical form of STC results from the assumption concerning the course of the function fs = fs (T) describing the changes of solid state volumetric fraction and the temperature at the point considered. Between border temperatures Ts , Tl the function fs changes from 1 to 0. In this paper the volumetric fraction fs (more precisely fl = 1- fs) is found using the simple models of macrosegregation (the lever arm rule, the Scheil model). In this way one obtains the formulas determining the course of STC resulting from the certain physical considerations and this approach seems to be closer to the real course of thermal processes proceeding in domain of solidifying alloy.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 4; 113-116
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Grain Refinement of AlSi7Mg0,3 Alloy Cast by Rheocasting SEED
    Autorzy:
    Bryksí Stunová, B.
    Bryksí, V.
    Vitkova, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/382371.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theory of crystallization
    innovative foundry technologies
    innovative foundry materials
    solidification process
    metallography
    rheocasting
    teoria krystalizacji
    innowacyjne technologie odlewnicze
    innowacyjne materiały odlewnicze
    proces krzepnięcia
    metalografia
    Opis:
    The paper concerns experimental work studying chemical composition, structures and selected mechanical properties of castings produced by rheocasting method SEED. After previous experiments, which showed inclusions in the primary phase α(Al) when observing structures, hypothesis of external nuclei was taken. The main goal of the work was to determine the influence of inoculation by various additions of titanium/boron based inoculant on the structure and properties of AlSi7Mg0,3 alloy. The master alloy AlTi5B1 was added in amounts of 0,05, 0,1, 0,15, 0,2 wt %. Metallographic observation by light and SEM microscopy was used for analysing the structures. Measurements of grain size were realised and evaluated. Brinell hardness measurements were performed. Chemical composition was measured by GDS analysis. Undertaken experiments did not prove the effect of inoculation of combined AlTi5B1 master alloy on castings made of AlSi7Mg0,3 alloy made by rheocasting SEED at given amounts and conditions.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 3; 161-166
    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:
    Analytic-numerical method of determining the freezing front location
    Autorzy:
    Grzymkowski, R.
    Hetmaniok, E.
    Pleszczyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/381964.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    information technology
    foundry industry
    one-phase Stefan problem
    moving boundary problem
    proces krzepnięcia
    technologia informacyjna
    przemysł odlewniczy
    jednofazowy problem Stefana
    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 boundary problems with the moving boundary. Solution of such defined problem requires, most often, to use sophisticated numerical techniques and far advanced mathematical tools. Excellent illustration of the complexity of considered problems, as well as of the variety of approaches used for finding their solutions, gives the papers [1-4]. In the current paper, the authors present the, especially attractive from the engineer point of view, analytic-numerical method for finding the approximate solution of 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 the sought function describing the temperature field into the power series, some coefficients of which are determined with the aid of boundary conditions, and on the approximation of the function defining the location of freezing front with the broken line, parameters of which are numerically determined.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 3 spec.; 75-80
    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:
    Effect of Mesh Quality on the Numerical Solution of the Solidification of Pure Metal
    Autorzy:
    Skrzypczak, T.
    Węgrzyn-Skrzypczak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/381672.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    information technology
    foundry industry
    pure metal
    Stefan problem
    finite element method
    krzepnięcie stopu
    technologia informatyczna
    przemysł odlewniczy
    metal czysty
    zagadnienie Stefana
    metoda elementów skończonych
    Opis:
    The paper presents a method of mathematical and numerical modelling of directional solidification process of pure metal in the two-dimensional region. In this case, the thermal conditions associated with the process favours the occurrence of sharp solidification front. The mathematical description of the process is based on the Stefan formulation with appropriate continuity conditions on the solid-liquid interface. The numerical model is based on the finite element method (FEM). The calculations were made on a fixed mesh with diffused solidification front to avoid the difficulties associated with the discontinuity. Temporary position of the interface was calculated with the use of the level set method (LSM). Effect of the quality of the spatial discretization on the accuracy of numerical solution was investigated. Obtained results of the temporary front position were compared with the analytical solution. The correlation between the quality of the spatial discretization and the accuracy of the results was observed. Methods used in the work had significant impact on the computation time and helped avoid the explicit consideration of discontinuity of heat flux on the front.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 2 spec.; 89-92
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Rank Controlled Differential Quadrature Method for Solving an Infinite Steel Plate Cooling Problem
    Autorzy:
    Żak, P. L.
    Suchy, J. S.
    Lelito, J.
    Gracz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/381994.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    information technology
    foundry industry
    solidification process
    exact solution
    rank controlled differential quadrature
    numerical modelling
    technologia informatyczna
    przemysł odlewniczy
    proces krzepnięcia
    dokładne rozwiązanie
    kwadratura różniczkowa sterowanego rzędu
    modelowanie numeryczne
    Opis:
    Rank Controlled Differential Quadrature method is a numerical method that allows to approximate the partial derivatives that appears in partial differential equations. Those equations with proper geometrical, physical, initial and boundary conditions make mathematical models of physical process. The heat transfer process is governed by Fourier–Kirchhoff equation, which is parabolic Partial Differential Equation. In this paper authors present the steel plate cooling problem. At the beginning of the process plate is heated up to 450 °C and is cooled to ambient temperature. The cooling of the plate is basic heat transfer problem. If the plates dimensions has proper proportions such problem may be described as one dimensional and solved exactly. The mathematical model and exact solution is given in the work. Authors apply the Rank Controlled Differential Quadrature to approximate derivatives in Fourier–Kirchhoff equation and in boundary conditions. After changing derivatives into quadrature formulation set of algebraic equations is obtained. Substituting thermo-physical parameters numerical model is obtained. The computer program was prepared to solve the problem numerically. Results of simulation are confronted with the exact ones. Error value at each time step as well as error value increase rate for examined numerical method is analyzed.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 3 spec.; 201-206
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of the Heat Transfer Coefficient in the Inverse Stefan Problem by Using the ABC Algorithm
    Autorzy:
    Hetmaniok, E.
    Słota, D.
    Zielonka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/382882.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    foundry industry
    application of information technology
    Stefan problem
    swarm intelligence
    ABC algorithm
    proces krzepnięcia
    przemysł odlewniczy
    zastosowanie technologii informatycznych
    Problem Stefana
    inteligencja roju
    algorytm ABC
    Opis:
    A procedure based on the Artificial Bee Colony algorithm for solving the two-phase axisymmetric one-dimensional inverse Stefan problem with the third kind boundary condition is presented in this paper. Solving of the considered problem consists in reconstruction of the function describing the heat transfer coefficient appearing in boundary condition of the third kind in such a way that the reconstructed values of temperature would be as closed as possible to the measurements of temperature given in selected points of the solid. A crucial part of the solution method consists in minimizing some functional which will be executed with the aid of one of the swarm intelligence algorithms - the ABC algorithm.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 2s; 27-32
    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:
    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:
    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:
    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:
    Badanie kinetyki krzepnięcia i stygnięcia masy modelowej w matrycy
    The study of the kinetics of solidification and cooling of pattern material in a die
    Autorzy:
    Stachańczyk, J.
    Pabiś, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/391512.pdf
    Data publikacji:
    2011
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    kinetyka krzepnięcia
    masy modelowe
    stygnięcie
    proces technologiczny
    kinetics of solidification
    pattern material
    cooling
    technological process
    Opis:
    W artykule zaprezentowano opracowaną metodykę badań pozwalającą na ocenę kinetyki krzepnięcia i stygnięcia mas modelowych w formie metalowej - matrycy. Przedstawiono zastosowaną aparaturę oraz wyniki badań wytypowanych mas modelowych. Określono szybkość krzepnięcia i stygnięcia przy zmiennych parametrach przebiegu procesu technologicznego.
    The article presents the developed research methodology that allows the evaluation of the kinetics of solidification and cooling of pattern material in a metal mould (die). The apparatus was described and the results of investigations carried out on selected pattern materials were presented. The solidification and cooling rate under the variable parameters of a technological process was determined.
    Źródło:
    Prace Instytutu Odlewnictwa; 2011, 51, 2; 45-53
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Model Of Binary Alloys Solidification Basing On The One Domain Approach And The Simple Macrosegregation Models
    Model numeryczny krzepnięcia stopów dwuskładnikowych z wykorzystaniem metody jednego obszaru i prostych modeli makrosegregacji
    Autorzy:
    Majchrzak, E.
    Mochnacki, B.
    Mendakiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/354002.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    alloys solidification
    one domain approach
    macrosegregation process
    substitute thermal capacity
    numerical modeling
    krzepnięcie stopów
    metoda jednego obszaru
    makrosegregacja
    zastępcza pojemność cieplna
    modelowanie numeryczne
    Opis:
    In the paper the thermal processes proceeding in the domain of solidifying binary alloy are considered. The mathematical model of solidification and cooling processes bases on the one domain method (or fixed domain method). In such a model the parameter called a substitute thermal capacity (STC) appears. At the stage of STC construction the macrosegregation process described by the lever arm rule or the Scheil model is taken into account. In this way one obtains the formulas determining the course of STC resulting from the certain physical considerations and this approach seems to be closer to the real course of thermal processes proceeding in domain of solidifying alloy. In the final part the examples of numerical solutions basing on the finite difference method are presented.
    W pracy rozpatruje się procesy cieplne zachodzące w obszarze krzepnącego i stygnącego stopu dwuskładnikowego. Model matematyczny tych procesów bazuje na podejściu nazywanym metodą jednego obszaru. W modelach tego typu pojawia się parametr nazywany zastępczą pojemnością cieplną. Na etapie jej definiowania autorzy uwzględnili proste modele makrosegregacji wynikające z reguły dźwigni i znanego modelu Scheila. Otrzymane zależności determinujące przebiegi pojemności zastępczej na podstawie pewnych rozważań fizycznych wydają się lepiej przybliżać rzeczywisty przebieg procesów cieplnych zachodzących w obszarze krzepnącego stopu. W końcowej części pracy pokazano wyniki rozwiązań numerycznych uzyskanych przy wykorzystaniu metody różnic skończonych.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 3; 2431-2435
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling of Melting and Resolidification in Domain of Metal Film Subjected to a Laser Pulse
    Autorzy:
    Majchrzak, E.
    Mochnacki, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/379913.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry process
    heat transfer
    melting
    solidification
    dual phase lag model
    numerical methods
    theoretical basis
    proces odlewniczy
    przenikanie ciepła
    topienie
    krzepnięcie
    model dwufazowy
    metody numeryczne
    podstawy teoretyczne
    Opis:
    Thermal processes in domain of thin metal film subjected to a strong laser pulse are discussed. The heating of domain considered causes the melting and next (after the end of beam impact) the resolidification of metal superficial layer. The laser action (a time dependent bell-type function) is taken into account by the introduction of internal heat source in the energy equation describing the heat transfer in domain of metal film. Taking into account the extremely short duration, extreme temperature gradients and very small geometrical dimensions of the domain considered, the mathematical model of the process is based on the dual phase lag equation supplemented by the suitable boundary-initial conditions. To model the phase transitions the artificial mushy zone is introduced. At the stage of numerical modeling the Control Volume Method is used. The examples of computations are also presented.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 1; 41-44
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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