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    Wyświetlanie 1-7 z 7
    Tytuł:
    Log-Normal Distribution of Heterogeneous Nucleation Substrate in the AZ91/SiCp Composite
    Autorzy:
    Gracz, B.
    Żak, P. L.
    Szucki, M.
    Lelito, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/379492.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    AZ91/SiCp composite
    heterogeneous nucleation
    log-normal distribution
    substrate distribution
    kompozyt AZ91/SiCp
    zarodkowanie heterogeniczne
    rozkład log-normalny
    rozkład podłoża
    Opis:
    The aim in this work is to develop a log-normal distribution of heterogeneous nucleation substrates for the composite based on AZ91 alloy reinforced by SiC particles. The computational algorithm allowing the restore of the nucleation substrates distribution was used. The experiment was performed for the AZ91 alloy containing 4%wt. of SiC particles. Obtained from experiment, the grains density of magnesium primary phase and supercooling were used to algorithm as input data.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 3 spec.; 35-38
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the Microstructure, Properties and Machinability of Al-Cu-Si Alloys
    Autorzy:
    Kozana, J.
    Piękoś, M.
    Maj, M.
    Garbacz-Klempka, A.
    Żak, P. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1840820.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    casting of non-ferrous metals
    aluminum alloys
    ternary Al-Cu-Si alloy
    mechanical properties
    microstructure
    thermo-calc
    odlewanie metali nieżelaznych
    stopy aluminium
    stop trójskładnikowy Al-Cu-Si
    właściwości mechaniczne
    mikrostruktura
    Opis:
    As part of the studies conducted in the field of broadly understood casting of non-ferrous metals, selected results on the impact of variable additions of copper and silicon in aluminium were presented. A series of melts was carried out with copper content kept constant at a level of 2% (1st stage) and 4% (2nd stage) and variable contents of silicon introduced into aluminium. The crystallization characteristics of the examined alloys and the percentage of structural constituents at ambient temperature were obtained by modelling the thermodynamic parameters of individual phases with the CALPHAD method. The microstructure of the obtained alloys was examined and microhardness was measured by the Vickers-Hanemann method. The alloy properties were assessed based on the results of mechanical tests, including ultimate tensile strength (UTS), hardness (BHN) and elongation (E). The machinability of the tested alloys was analyzed in a machinability test carried out by the Keep-Bauer method, which consisted in drilling with a constant feed force. The obtained results clearly indicate changes in the images of microstructure, such as the reduction in grain size, solution hardening and precipitation hardening. The changes in the microstructure are also reflected in the results of mechanical properties testing, causing an increase in strength and hardness, and plasticity variations in the range of 4 ÷ 16%, mainly due to the introduced additions of copper and silicon. The process of alloy strengthening is also visible in the results of machinability tests. The plotted curves showing the depth of the hole as a function of time and the images of chips produced during the test indicate an improvement in the wear resistance obtained for the tested group of aluminium alloys with the additions of copper and silicon.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 4; 145-153
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of Ti and Fe on the Microstructure and Properties of Copper and Copper Alloys
    Autorzy:
    Piękoś, M.
    Garbacz-Klempka, A.
    Kozana, J.
    Żak, P. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1840892.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    copper alloys
    thermodynamic modelling
    alloying additions
    titanium
    mechanical properties
    microstructure
    stopy miedzi
    modelowanie termodynamiczne
    dodatki stopowe
    tytan
    właściwości mechaniczne
    mikrostruktura
    Opis:
    The paper discusses issues related to the technology of melting and processing of copper alloys. An assessment was made of the impact of titanium and iron introduced in the form of pre-alloy - Ti73Fe master alloy on the microstructure and selected properties of pure copper and copper-silicon alloy. There are known examples of the use of titanium and iron additive to the copper alloy. Titanium as an additive introduced to copper alloys to improve their properties is sometimes also applicable. In the first stage of the study, a series of experimental castings were conducted with variable content of Ti73Fe master alloy entering copper in quantities of 5 %, 15 %, 25 % in relation to the mass of the metal charge. In the second stage, a silicon additive was introduced into copper in the amount of about 4 % by weight and 0.5 % and 1 % respectively of the initial Ti73Fe alloy. Thermodynamic phase parameters were modelled using CALPHAD method and Thermo-Calc software, thus obtaining the crystallization characteristics of the test alloys and the percentage of structural components at ambient temperature. Experiments confirmed the validity of the use of Ti73Fe master alloy as an additive. The pre-alloy used showed a favourable performance, both in terms of addition solubility and in the area of improvement of strength properties. Changes were achieved in the microstructure, mainly within the grain, but also in the developed dendrites of the solid solution. Changes occur with the introduction of titanium with iron into copper as well as to two-component silicon bronze.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 4; 83-90
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling and Simulation of the Magnesium Primary Phase Crystallization in the AZ91/SiCp Composite Dependent on Mass Fraction of SiCp
    Autorzy:
    Lelito, J.
    Krawiec, H.
    Vignal, V.
    Gracz, B.
    Żak, P. L.
    Szucki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/356885.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    numerical simulation
    AZ91/SiCp composite
    micro-model
    Opis:
    The aim of this work is to develop a numerical model capable of predicting the grain density in the Mg-based matrix phase of an AZ91/SiC composite, as a function of the total mass fraction of the embedded SiC particles. Based on earlier work in a range of alloy systems, we assume an exponential relationship between the grain density and the maximum supercooling during solidification. Analysis of data from cast samples with different thicknesses, and mass fractions of added SiCp, permits conclusions to be drawn on the role of SiCp in increasing grain density. By fitting the data, an empirical nucleation law is derived that can be used in a micro model. Numerical simulation based on the model can predict the grain density of magnesium alloys containing SiC particles, using the mass fraction of the particles as inputs. These predictions are compared with measured data.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 1; 29-32
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rozkład wielkości podłoża do zarodkowania heterogenicznego fazy pierwotnej stopu Al-Cu
    Size Distribution of Substrate to Heterogenous Nucleation of Primary Phase in Al-Cu Alloy
    Autorzy:
    Lelito, J.
    Gracz, B.
    Żak, P. L.
    Suchy, J. S.
    Szucki, M.
    Malinowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/380896.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    rozkład logarytmiczno-normalny
    rozkład Oldfielda
    rozkład eksponecjalny
    zarodkowanie heterogeniczne
    stop Al-Cu
    longnormal distribution
    heterogenous nucleation
    Al-Cu alloy
    Opis:
    Rozwój komputeryzacji spowodował duży postęp w numerycznym modelowaniu krystalizacji stopów odlewniczych. Możliwe staje się prognozowanie mikrostruktury odlewów. W tym celu konieczna jest znajomość równań opisujących rozkłady wielkości podłoża do zarodkowania heterogenicznego ziaren bądź funkcji gęstości ziaren w zależności od przechłodzenia. W pracy zamieszczono obliczenia dla modelu wykładniczego i eksponencjalnego gęstości ziaren w funkcji przechłodzenia maksymalnego. Dodatkowo przeprowadzono również obliczenia dla logarytmiczno-normalnego rozkładu wielkości podłoża do zarodkowania heterogenicznego. Zasadniczym celem tej pracy jest wyznaczenie w powyższych równaniach, parametrów dopasowania krzepnącego stopu Al-Cu na podstawie badań doświadczalnych zamieszczonych w literaturze [7]. W przypadku logarytmiczno-normalnego rozkładu wielkości podłoża do zarodkowania heterogenicznego, parametry występujące w tym równaniu zostały wyznaczone za pomocą algorytmu numerycznego. Tak wyznaczone rozkłady zostały następnie zestawione na wykresie z danymi eksperymentalnymi w celu ich porównania.
    The development of computerization caused a lot of progress in numerical modeling of alloys crystallization. It becomes possible to predict casting microstructure. For this purpose, it is necessary to know the equations describing the size distribution of the substrate to the heterogeneous nucleation of grains or grains density function dependence on supercooling. The paper presents calculations for Oldfield and exponential model of grain density as a function of the maximum supercooling. In addition, calculations were also performed for the log-normal distribution of the substrate size to heterogeneous nucleation of primary phase. The main aim of this work is to determine the fitting parameters of Al-Cu alloy solidifying based on experimental studies published in the literature [7] for above equations. In the case of log-normal size distribution of substrate for heterogeneous nucleation, the parameters present in the equation were determined using a numerical algorithm. Thanks to these schedules were then summarized in the graph of experimental data for comparison.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 4 spec.; 83-86
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reconstruction of the Casting Technology in the Bronze Age on the Basis of Investigations and Visualisation of Casting Moulds
    Autorzy:
    Garbacz-Klempka, A.
    Kwak, Z.
    Żak, P. L.
    Szucki, M.
    Ścibior, D.
    Stolarczyk, T.
    Nowak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/381850.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    application of information technology
    foundry industry
    archaeometallurgy
    casting moulds
    bronze
    XRF
    zastosowanie technologii informatycznych
    przemysł odlewniczy
    archaeometalurgia
    formy odlewnicze
    brąz
    Opis:
    During excavation of the cremation cemetery of urnfield culture in Legnica at Spokojna Street (Lower Silesia, Poland), dated to 1100-700 BC, the largest - so far in Poland – a collection of casting moulds from the Bronze Age was discovered: three moulds for axes casting made out of stone and five moulds for casting sickles, razors, spearhead and chisels, made out of clay. This archaeological find constituted fittings of foundrymen’s graves. In order to perform the complete analysis of moulds in respect of their application in the Bronze Age casting technology analytical methods, as well as, computer aided methods of technological processes were used. Macroscopic investigations were performed and the X-ray fluorescence spectrometry method was used to analyse the chemical composition and metal elements content in mould cavities. Moulds were subjected to three-dimensional scanning and due to the reverse engineering the geometry of castings produced in these moulds were obtained. The gathered data was used to perform design and research works by means of the MAGMA5 software. Various variants of the pouring process and alloys solidification in these archaeological moulds were simulated. The obtained results were utilised in the interpretation of the Bronze Age casting production in stone and clay moulds, with regard to their quality and possibility of casting defects occurrence being the result of these moulds construction. The reverse engineering, modelling and computer simulation allowed the analysis of moulds and castings. Investigations of casting moulds together with their digitalisation and reconstruction of casting technology, confirm the high advancement degree of production processes in the Bronze Age.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 3; 184-190
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computer Simulation of the Formation of Non-Metallic Precipitates During a Continuous Casting of Steel
    Autorzy:
    Kalisz, D.
    Żak, P. L.
    Tokarski, T.
    Wzorek, Ł.
    Suchy, J. S.
    Kiczor, M.
    Cieślak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/958226.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    non-metallic oxide precipitates
    modelling
    continuous casting of steel
    crystallization
    Opis:
    The authors own computer software, based on the Ueshima mathematical model with taking into account the back diffusion, determined from the Wołczyński equation, was developed for simulation calculations. The applied calculation procedure allowed to determine the chemical composition of the non-metallic phase in steel deoxidised by means of Mn, Si and Al, at the given cooling rate. The calculation results were confirmed by the analysis of samples taken from the determined areas of the cast ingot. This indicates that the developed computer software can be applied for designing the steel casting process of the strictly determined chemical composition and for obtaining the required non-metallic precipitates.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 1; 335-340
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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