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    Wyświetlanie 1-7 z 7
    Tytuł:
    Evolution of Aluminium Melt Quality of A356 After Several Recycling
    Autorzy:
    Gursoy, O.
    Erzi, E.
    Tur, K.
    Dispinar, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1840918.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    A356
    recycling
    melt quality
    reduce pressure test
    bifilm index
    recykling
    topnienie
    próba ciśnieniowa
    Opis:
    Recyclability is one of the great features of aluminium and its alloys. However, it has been typically considered that the secondary aluminium quality is low and bad. This is only because aluminium is so sensitive to turbulence. Uncontrolled transfer and handling of the liquid aluminium results in formation of double oxide defects known as bifilms. Bifilms are detrimental defects. They form porosity and deteriorate the properties. The detection and quantification of bifilms in liquid aluminium can be carried out by bifilm index measured in millimetres as an indication of melt cleanliness using Reduced Pressure Test (RPT). In this work, recycling efficiency and quality change of A356 alloy with various Ti additions have been investigated. The charge was recycled three times and change in bifilm index and bifilm number was evaluated. It was found that when high amount of Ti grain refiner was added, the melt quality was increased due to sedimentation of bifilms with Ti. When low amount of Ti is added, the melt quality was degraded.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 4; 61-66
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fluidity Characteristics of A201 and A206 Al-Cu Alloy
    Autorzy:
    Yildirim, K.
    Helvaci, M.
    Gürsoy, Ö.
    Erzi, E.
    Kahruman, C.
    Dispinar, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/380959.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Cu alloy
    casting
    fluidity of alloy
    mould coating
    stop Al-Cu
    odlew
    lejność stopu
    forma odlewnicza
    Opis:
    Al-4.5Cu alloys are widely used in aerospace industries due to their low weight and high mechanical properties. This group of aluminium alloys is known as 2xx series and exhibits the highest mechanical properties however this alloy is known to suffer from feedability and high tendency for hot tearing. Al-Si alloys (3xx) have improved fluidity and better feedability particularly by several modifications such as Ti, B or Sr. Eutectic temperature is decreased and mechanical properties can be enhanced. Yet, the strength values of this alloy group cannot reach the values of 2xx series. Therefore, in this study, the effect of Ag addition on the fluidity of Al-4.5Cu alloy has been investigated. Standard size spiral mould was used. The casting temperature was selected to be 770oC. Five castings were made and Weibull statistical approach was used to evaluate the results. In addition, coating of the die with BN was also investigated. It was found that Ag addition and BN coating of the die revealed the most reproducible, reliable and high fluidity values.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 1; 135-138
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of Metal Quality and Porosity Formation in Low Pressure Die Casting of A356: Experimental Observations
    Autorzy:
    Gursoy, O.
    Nordmak, A.
    Syversten, F.
    Colak, M.
    Tur, K.
    Dispinar, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837813.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    die casting
    alloy A356
    solidification
    LPDC
    aluminium
    quality of alloy
    bifilm
    porosity
    odlewanie ciśnieniowe
    stop A356
    krzepnięcie
    właściwości stopu
    porowatość
    Opis:
    Porosity is one of the major problems in casting operations and there are several discussions in the literature about the porosity formation in aluminum castings. Bifilms are the defects that are introduced into the melt by turbulence. They can be detected with reduced pressure test and presented numerically by measuring bifilm index. The measure of bifilm index is the sum of total oxide length given in millimeters from the cross-section of reduced pressure test sample solidified under 0.01 MPa. In this work, low pressure die casting (LPDC) unit was built in an attempt to enhance the producibility rate. The unit consists of a pump housing that was placed inside the melt in the melting furnace where the pressure was applied instead of the whole melt surface. It was observed that the melt quality of A356 alloy was deteriorated over time which had led to higher porosity. This was attributed to the increased oxide thickness of the bifilm by the consumption of air in between the folded oxides. A relationship was found between bifilm index and pore formation.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 1; 5-10
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Challenges in Producing Reliable Tensile Properties by SIMA 7075
    Autorzy:
    Erzi, E.
    Gursoy, O.
    Yüksel, Ç.O.K.
    Kirtay, S.
    Dispinar, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/380843.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    AA7075
    mechanical properties
    product development
    semi-solid processing
    thixocasting
    SIMA
    właściwości mechaniczne
    rozwój produktu
    przetwarzanie
    Opis:
    Aluminium alloys are one of the preferred materials especially for land and air transportation because of their high strength and low-density properties. Although production using casting method is economical yet it has some disadvantages. Shrinkage which is occurred due to the density difference between the solid and liquid metal is prevented by feeders which need to be calculated. Liquid metal should be transferred to the mould without any turbulence. As a result, sprues are needed to be designed precisely. On the other hand, aluminium alloys can also be shaped by forging at semi-solid temperatures. There are some advantages compared to the traditional forging methods of improving die life due to the lower tonnage values. In this study, semi-solid produced 7075 aluminium alloy die filling capabilities were investigated. To achieve semisolid structure strain induced melt activated method (SIMA) was used. The desired structure was achieved at 635°C and 30 minutes of duration of heat treatment. After determining the optimum parameters, metallographic analysis, density calculations, porosity distribution and tensile tests were carried out. It was found that the reproducibility of SIMA produced 7075 alloy was quite low. A proper tensile test result was achieved only 7 of the total 15 tests and the mean value was 386 MPa. The main reason for this scattered in mechanical properties could be the chemical composition of the alloy and the rapid solidification of the liquid eutectic phases. It is important to define the best fitting process parameters and controlling them precisely will be the most important factors for future studies.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 3; 71-75
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of Metal Quality and Porosity Formation in Low Pressure Die Casting of A356: Experimental Observations
    Autorzy:
    Gursoy, O.
    Nordmak, A.
    Syversten, F.
    Colak, M.
    Tur, K.
    Dispinar, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837851.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    die casting
    alloy A356
    solidification
    LPDC
    aluminium
    quality of alloy
    bifilm
    porosity
    odlewanie ciśnieniowe
    stop A356
    krzepnięcie
    właściwości stopu
    porowatość
    Opis:
    Porosity is one of the major problems in casting operations and there are several discussions in the literature about the porosity formation in aluminum castings. Bifilms are the defects that are introduced into the melt by turbulence. They can be detected with reduced pressure test and presented numerically by measuring bifilm index. The measure of bifilm index is the sum of total oxide length given in millimeters from the cross-section of reduced pressure test sample solidified under 0.01 MPa. In this work, low pressure die casting (LPDC) unit was built in an attempt to enhance the producibility rate. The unit consists of a pump housing that was placed inside the melt in the melting furnace where the pressure was applied instead of the whole melt surface. It was observed that the melt quality of A356 alloy was deteriorated over time which had led to higher porosity. This was attributed to the increased oxide thickness of the bifilm by the consumption of air in between the folded oxides. A relationship was found between bifilm index and pore formation.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 1; 5-10
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of Fracture Stress with Regard to Porosity in Cast A356 Alloy
    Autorzy:
    Sahin, H.
    Atik, M.
    Tezer, F.
    Temel, S.
    Aydin, O.
    Kesen, O.
    Gursoy, O.
    Dispinar, Derya
    Powiązania:
    https://bibliotekanauki.pl/articles/2079787.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    A356
    casting defects
    mechanical properties
    porosity
    fracture stress
    Bifilm
    stop A356
    wady odlewnicze
    właściwości mechaniczne
    porowatość
    naprężenia
    Opis:
    Production of the defect-free casting of aluminium alloys is the biggest challenge. Porosity is known to be the most important defect. Therefore, many cast parts are subjected to several non-destructive tests in order to check their acceptability. There are several standards, yet, the acceptance limit of porosity size and distribution may change according to the customer design and requirements. In this work, the aim was targeted to evaluate the effect of size, location, and distribution of pores on the tensile properties of cast A356 alloy. ANSYS software was used to perform stress analysis where the pore sizes were changed between 0.05 mm to 3 mm by 0.05 mm increments. Additionally, pore number was changed from 1 to 5 where they were placed at different locations in the test bar. Finally, bifilms were placed inside the pore at different sizes and orientations. The stress generated along the pores was recorded and compared with the fracture stress of the A356 alloy. It was found that as the bifilm size was getting smaller, their effect on tensile properties was lowered. On the other hand, as bifilms were larger, their orientation became the dominant factor in determining the fracture.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 4; 21-28
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Jameson cell and jet diffuser flotation column
    Autorzy:
    Bilir, K.
    Ucar, A.
    Sahbaz, O.
    Gursoy, H.
    Oteyaka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/109686.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    jet diffuser flotation column
    flotation
    Jameson Cell
    talc
    Opis:
    A Jet Diffuser Flotation Column (JDFC) is a newly designed flotation device which resembles the Jameson cell (JFC) in terms of operational principles, but it has an important difference regarding to the structural characteristics in the downcomer. The main difference of JDFC is the diffuser type of downcomer which has been designed using the hydrodynamic consideration and fluid mechanics principles. The aim of the design was to increase the device efficiency for coarse particle flotation. Therefore, the turbulence occurring at the end of the downcomer was reduced, and the detachment probability of the coarse particle decreased. In addition, a homogenous and stable foam zone in the cell was obtained. According to the experimental results carried out in a pilot scale showed that not only higher flotation performance in comparison to the Jameson cell was obtained specifically for the coarse particles but also the quiescent froth layer was acquired under the given conditions. In these experiments, a vertical pipe of JDFC having an inlet diameter of 60 mm and outlet diameters of 115, 125 and 135 mm was used with the separation tank with the diameter of 390 mm. By using the data, the pilot scale JDFC with the 4100 mm vertical pipe integrated with the separation tank was produced, and the flotation tests were carried out by using a talc ore. Finally, the talc recovery of 90% was obtained using the JDFC for the particle size of 350 μm.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 1; 174-181
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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