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    Tytuł:
    Effect of Maximum Piston Velocity on Internal Homogeneity of AlSi9Cu3(Fe) Alloy Processed by High-Pressure Die Casting
    Autorzy:
    Matejka, Marek
    Bolibruchowá, Dana
    Podprocká, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2203939.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Si-Cu alloy
    high-pressure die casting
    porosity
    Brinell hardness
    microstructure
    stop Al-Si-Cu
    odlewanie wysokociśnieniowe
    porowatość
    twardość Brinella
    mikrostruktura
    Opis:
    High-pressure die casting results in a high quality surface and good mechanical properties of castings. Under the effect of pressure, integral and solid castings are achieved without a large number of foundry defects. The correct and proper setting of technological parameters plays a very important role in minimizing casting defects. The aim of the presented article is to determine the optimum maximum piston velocity for a casting in the high-pressure casting process with two height variants, depending on their internal quality. It is because the internal quality of particular castings is important in terms of proper functionality in operations where the biggest problem is the porosity of the casting. The main cause of porosity formation is the decreasing solubility of gases (most often hydrogen) during the melt solidification. Solubility represents the maximum amount of gas that can dissolve in a metal under equilibrium conditions of temperature and pressure. Macroporosity and microporosity were determined from the sections of the surfaces in the determined zones of the castings. Here, the results was that the macroporosity decreased with increasing piston velocity. Ideal microstructure was evaluated at a piston velocity of 3 m/s for both types of castings. On the other hand, the increase in tube size has shown that velocities of 3 m/s and higher, the tube is more prone to macroporosity formation. The highest hardness was achieved at the piston velocity of 2 m/s at both tube lengths.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 4; 34--40
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects Of T6 Heat Treatment With Double Solution Treatment On Microstructure, Hardness And Corrosion Resistance Of Cast Al-Si-Cu Alloy
    Wpływ obróbki termicznej T6 połączonej z podwójnym przesycaniem na mikrostrukturę, twardość oraz odporność na korozję stopu Al-Si-Cu
    Autorzy:
    Wiengmoon, A.
    Sukchot, P.
    Tareelap, N.
    Pearce, J. T. H.
    Chairuangsri, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/354142.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Si-Cu alloy
    heat treatment
    age hardening
    microstructure
    hardness
    corrosion resistance
    stop Al-Si-Cu
    obróbka cieplna
    utwardzanie wydzieleniowe
    mikrostruktura
    twardość
    odporność na korozję
    Opis:
    Effects of T6 heat treatment with double solution treatment on microstructure, hardness and corrosion resistance of a cast A319 (Al-4.93wt%Si-3.47wt%Cu) alloy were investigated. The T6 heat treatment comprised of the first solution treatment at 500±5°C for 8 h, the second solution treatment in the temperature range of 510 to 530±5°C for 2 h followed by water quenching (80°C), and artificial aging at 170°C for 24 h followed by water quenching (80°C). Microstructure of the alloy was studied by optical microscopy and electron microscopy, Rockwell hardness was measured, and corrosion resistance in 0.1 M NaCl aqueous solution was determined by a potentiodynamic technique. The results revealed that the T6 heat treatment with double solution treatment led to an improvement in corrosion resistance and comparable macrohardness as compared to those obtained from the case of single solution treatment. The second solution treatment at 520°C is the optimum leading to relatively low corrosion current density without substantial drawbacks on breakdown potential or the width of passive range.
    W pracy badano wpływ obróbki termicznej T6 połączonej z podwójnym przesycaniem na mikrostrukturę, twardość oraz odporność na korozję stopu A316 (Al-4,93Si-3,47Cu w % wag.) otrzymanego metodą odlewania. Obróbkę termiczną T6 przeprowadzono w następujący sposób: w pierwszej kolejności stop poddano przesycaniu w temperaturze 500±5°C przez 8 godzin, a następnie w zakresie temperatur od 510 do 530±5°C przez 2 godziny, hartowanie wodą (80°C) oraz sztuczne starzenie w 170°C przez 24 godziny i ponowne hartowanie wodą (80°C). Mikrostrukturę stopu badano metodami mikroskopii optycznej i mikroskopii elektronowej. Pomiar twardości stopu wykonano metodą Rockwella. Odporność stopu na korozję w roztworze wodnym 0.1 M NaCl wyznaczono metodą potencjodynamiczną. Otrzymane wyniki wykazały, że obróbka termiczna T6 z podwójnym przesycaniem prowadzi do poprawy makrotwardości oraz odporności materiału na korozję w porównaniu do stopu poddanego pojedynczemu przesycaniu. Stwierdzono także, iż drugie przesycanie w temperaturze 520°C jest optymalne i prowadzi do stosunkowo niskiej gęstości prądu korozyjnego bez znaczących odchyleń potencjału rozkładowego lub szerokości zakresu pasywnego.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2A; 881-886
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study of Microstructure and Porosity Formation in High-Pressure Die-Casting
    Autorzy:
    Matejka, Marek
    Bolibruchová, D.
    Podprocká, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2126896.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Si-Cu alloy
    high-pressure die casting
    returnable material
    numerical simulation
    porosity
    microstructure
    stop Al-Si-Cu
    odlewanie wysokociśnieniowe
    odzysk materiału
    symulacja numeryczna
    porowatość
    mikrostruktura
    Opis:
    The technology of high-pressure die-casting (HPDC) of aluminum alloys is one of the most used and most economical technology for mass production of castings. High-pressure die-casting technology is characterized by the production of complex, thin-walled and dimensionally accurate castings. An important role is placed on the effective reduction of costs in the production process, wherein the combination with the technology of high-pressure die-casting is the possibility of recycling using returnable material. The experimental part of the paper focuses on the analysis of a gradual increase of the returnable material amount in combination with a commercial purity alloy for the production of high-pressure die-castings. The returnable material consisted of the so-called foundry waste (defective castings, venting and gating systems, etc.). The first step of the experimental castings evaluation consisted of numerical simulations, performed to determine the points of the casting, where porosity occurs. In the next step, the evaluation of areal porosity and microstructural analysis was performed on experimental castings with different amounts of returnable material in the batch. The evaluation of the area porosity showed only a small effect of the increased amount of the returnable material in the batch, where the worst results were obtained by the casting of the alloy with 90% but also with 55% of the returnable material in the batch. The microstructure analysis showed that the increase in returnable material in the batch was visibly manifested only by a change in the morphology of the eutectic Si.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 4; 127--130
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and Simulation Tests on the Impact of the Conditions of Casting Solidification from AlSi9Cu3 Alloy on their Structure and Mechanical Properties
    Autorzy:
    Hajkowski, J.
    Ignaszak, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/380310.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    alloy Al-Si-Cu
    casting solidification
    casting technologies
    microstructure
    mechanical properties
    stop Al-Si-Cu
    krzepnięcie odlewu
    technologie odlewania
    mikrostruktura
    właściwości mechaniczne
    Opis:
    The impact of casting conditions on microstructure a and mechanical properties was described, especially for cast products from AlSi9Cu3 alloy. Particular attention was paid to the parameters of dendritic structure: DAS 1 and DAS 2. Selected mechanical properties (by static tension test) of test castings made using basic technologies of casting: GSC - gravity sand casting, GDC - gravity die-casting and HPDC - high-pressure die-casting, are presented for cast-on test bars and cast separately. Casts were made of the same alloy AlSi9Cu3. Fractures and the zone near the fracture (after static tension test) was subjected to VT - visual tests, PT - penetration tests and metallographic tests. The condition of porosity (fracture zone) was also assessed. The analysis of virtual results was performed using the NovaFlow & Solid system together with the database and they were compared to experimental tests. This way of validation was applied in order to assess the correlation between the local rate of cooling and the size of DAS for GSC, GDC and HPDC technologies. Finally, the correlation between the parameters of structure and mechanical properties with regard to the impact of porosity was signalized.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 1; 167-175
    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
      Wyświetlanie 1-5 z 5

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