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Wyszukujesz frazę "Vahdat, S. E." wg kryterium: Autor

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Tin-Copper-Lead Alloy Produced by Horizontal Centrifugal Casting
    Autorzy:
    Vahdat, S. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/382114.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    centrifugal casting
    functionally graded materials
    phase diagram
    odlewanie odśrodkowe
    tworzywa gradientowe
    diagram fazowy
    Opis:
    Horizontal centrifugal casting is an effective method for the production of hollow metal with good mechanical properties, low defect, cast to size and relatively cheap. The ability of a metal to satisfy the above requirements highly depends on its microstructure. In this study, the relationship between microstructural parameters such as grain size and the amount of phases with bulk hardness of SnCu4Pb3 is concerned in three areas of the product. Consequently, to achieve the desired hardness of the product in a particular area, the interaction of two factors of the microstructure including, grain size and particles amount of the hard intermetallic compositions (Cu6Sn5) should be noted.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 1; 131-137
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Cooling Rate and Pouring Temperature on the Hardness and Wear Resistance of Bronze SAE660
    Autorzy:
    Karimifer, S.
    Vahdat, S. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/379943.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microstructure
    bearing
    pouring
    casting
    mikrostruktura
    łożysko
    odlewanie
    Opis:
    Metallic bearing alloys have different types, most of which are tin (Babbitt) or bronze based. Bronze bearings are used at heavy duty conditions. The goal of this research is an investigation on the effect of cooling rate and pouring temperature (two important factors in casting production) on the Brinell hardness and pin-on-disc wear resistance (two important properties in bearing applications) of bronze SAE660. The melt had prepared by induction furnace. Then, it had poured in sand mold in four different casting conditions, including pouring temperatures of 950 ºC and 1200 ºC, and cooling with water and air. Finally, the microstructure, hardness and wear resistance of the SAE660 had investigated. The results indicated that if the maximum hardness, along with the minimum weight loss due to wear (or maximum wear resistance) is required; the contents of intermetallic compounds, lead phase and the solid solution phase should be more. In this way, the samples which are cooled in air and poured at 950 ºC have the high hardness and the lowest weight loss.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 3; 144-151
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Repair of Structural Steel Surface Groove by Using Flame Welding Method by Spraying Pure Iron Powder
    Autorzy:
    Keyhany, P.
    Vahdat, S. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/381026.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    structural steel
    repair
    welding
    tensile strength
    mechanical properties
    oxyacetylene
    reducing flame
    konstrukcje stalowe
    naprawa
    spawanie
    wytrzymałość na rozciąganie
    własności mechaniczne
    Opis:
    To improve mechanical properties and increasing useful life of metal pieces, different methods of welding are used for repairing surface crack of metal pieces. In this research, performance of flame welding method by spraying pure iron powder evaluated for repairing surface grooves of structural steel. First, four specimens including one control specimen and other three specimens grooved specimens in depth of 1mm and in length of 12.5mm and groove width in the sizes of 0.5, 0.75 and 1mm.were prepared then, powder melted using oxyacetylene reducing flame and spraying iron powder in the flame path and attached to the inner surface of the groove and finally, the specimen repaired. Results showed that after repairing surface groove, tensile strength of the repaired specimens were reached to the tensile strength of control specimen with the margin of 2.5%.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 3; 167-171
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Repair of Structural Steel Surface Groove by Using Diffusion Welding of Pure Iron Powder
    Autorzy:
    Rahimy, Y.
    Vahdat, S. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/380060.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    tensile strength
    useful life
    steel surface cracks
    diffusion welding
    repair
    magnetic induction
    wytrzymałość na rozciąganie
    użytkowanie
    pęknięcia powierzchni
    naprawa
    zgrzewanie dyfuzyjne
    Opis:
    Metal pieces wear out due to variable loading, because cracks formed on their surface of them. In order to increase useful life of metal pieces with the help of different methods of welding, surface cracks are repaired. In this research, performance of the diffusion welding of pure iron powder through magnetic induction evaluated for repairing structural steel surface cracks. First, four specimens prepared including one control specimen and other three specimens grooved specimens in length of 6.25mm and in depth of 1mm and groove width in the sizes of 0.5, 0.75 and 1mm. Then by a coil, the induced current created in the piece surface. After crossing the current, the powder melted and the groove repaired due to diffusion welding. To prevent oxidation, the atmosphere inside the coil filled with argon gas. The results show that after repairing surface groove, tensile strength of the repaired specimens reached to the tensile strength of control specimen with the margin of 7.5%
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 2; 105-110
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strength of the Bond of Structural Steel S235JR to Bronze SAE660 Produced by Casting in Pre-Mold
    Autorzy:
    Zaheri, M.
    Vahdat, S. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/380357.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    casting in pre-mold
    bond length
    strength of the bond
    thrust bearing
    weld
    odlew wstępny
    czas wiązania
    wytrzymałość połączenia
    łożysko
    spawanie
    Opis:
    Different methods are used for production of bronze bearings. In terms of technical specifications, the success of each of these methods depends on the bond’s strength and in terms of economic, the production method is important. In this study, the aim is to study the strength and microstructure of steel-bronze thrust bearing bond that has been produced through the casting using pre-mold. In this study, in order to bond, the raw metals are chemically washed with sulfuric acid solution for five minutes at first. Then, the molten bronze SAE660 is cast in a structural steel S235JR pre-mold. The bond’s strength has been measured using the shear test three times; the measurement of bond’s length has been done using field emission scanning electron microscope (FESEM). The results indicate that the strength of the bond is at least 94.8 MPa and bond’s length is 0.45 micrometers. Therefore, this method was successful for trust bearing application.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 3; 149-154
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure Study of Diffusion Bonding of Centrifuged Structural Steel-Bronze
    Autorzy:
    Soflaei, H.
    Vahdat, S. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/382173.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    centrifugal casting
    bearings
    microstructure
    lubrication
    diffusion bonding
    line scan
    odlewanie odśrodkowe
    łożyska
    mikrostruktura
    Opis:
    One of the methods to prevent unsuitable lubrication of moving components of devices and machinery is using bi-metal and three-metal bearings. Centrifugal casting process is one of the manufacturing methods that is used for such bearings. In this study, the purpose is microstructure evaluation of the bonding location and length determination of diffusion bond in structural steel-bronze. A mold made of structural steel with inner diameter of 240mm, length of 300mm and thickness of 10mm was coated by a 6mm film of bronze under centrifugal casting process. At first, a bronze ingot with dimension of 5mm×10mm×20mm is located inside of the hollow cylindrical mold and then the two ends of it will be sealed. During mold rotation with the rate of 800 rpm, two high power flames are used for heating the mold under Ar gas atmosphere to melt the bronze ingot at 1000˚C. After 15minutes, the system is cooled rapidly. Results showed that the diffusion bonding of bronze in structural steel to depth of 1.2μm from the bonding line was obtained. In this bonding, copper element was diffused to 50% of its initial concentration.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 2; 99-104
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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