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Wyszukujesz frazę "hot ductility" wg kryterium: Temat

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Mechanical and Microstructural Response of Near Beta Ti Alloys to Hot Tensile Testing
    Autorzy:
    Abbasi, S. M.
    Momeni, A.
    Daraee, M.
    Akhondzadeh, A.
    Mirsaeed, S. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/351391.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermomechanical processing
    hot deformation
    dynamic softening
    yield-point phenomena
    hot ductility
    Opis:
    Hot tensile tests were carried out on Timetal-125 and Timetal-LCB near beta Ti alloys at temperatures in range of 600-1000°C and constant strain rate of 0.1 s-1. At temperatures below 700-800°C, the homogenuous and total strains for Timetal-LCB were greater than those for Timetal-125. In contrast, at temperatures over 800°C, Timetal-125 showed better hot ductility. The yield point phenomena was observed in Timetal-LCB at all temperatures. Unlikely, for Timetal-125, it was observed only at temperatures over 800°C. The weaker yield point phenomena in Timetal-125 could be attributed to the negative effect of Al on the diffusion of V. At all temperatures Timetal-LCB exhibited higher strength than Timetal-125. It was found that there should be a direct relationship between the extent of yield point phenomena and strength and dynamic softening through hot tensile testing. It was observed that at temperatures beyond 800°C (beta phase field in both alloys) dynamic recrystallization can progress more in Timetal-125 than in Timetal-LCB. These results were in good agreement with the better hot ductility of Timetal-125 at high temperatures. At low temperatures, i.e. below 700-800°C, partial dynamic recrystallization occurs in beta and dynamic globularization in alpha phase. These processes progress more in Timetal-LCB than in Timetal-125.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2A; 815-823
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Hot Deformation Behavior of CuFe2 Alloy
    Autorzy:
    Schindler, I.
    Sauer, M.
    Kawulok, P.
    Rodak, K.
    Hadasik, E.
    Jabłońska, M. Barbara
    Rusz, S.
    Ševčák, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/353206.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    copper alloy CuFe2
    hot ductility
    stress-strain curves
    hot deformation activation energy
    Opis:
    Nil strength temperature of 1062°C and nil ductility temperature of 1040°C were experimentally set for CuFe2 alloy. The highest formability at approx. 1020°C is unusable due to massive grain coarsening. The local minimum of ductility around the temperature 910°C is probably due to minor formation of γ-iron. In the forming temperatures interval 650-950°C and strain rate 0.1-10 s-1 the flow stress curves were obtained and after their analysis hot deformation activation energy of 380 kJ·mol-1 was achieved. Peak stress and corresponding peak strain values were mathematically described with good accuracy by equations depending on Zener-Hollomon parameter.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 2; 701-706
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hot deformation behavior of Mg-Zn-Al alloy tube processed by severe plastic deformation
    Autorzy:
    Fata, A.
    Faraji, G.
    Mashhadi, M. M.
    Tavakkoli, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/352771.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    PTCAP
    AZ31 tube
    grain refinement
    hot deformation
    High ductility
    Opis:
    In the current study, severe plastic deformation (SPD) was applied on a commercial Mg-3Al-1Zn alloy tubes via parallel tubular channel angular pressing (PTCAP) route. Different passes of PTCAP process were applied, and microstructure, hardness and tensile properties at the room, and elevated temperatures were evaluated. The results showed that bimodal microstructure appeared and led to AZ31 alloy represented higher hardness, higher strength with a reasonable elongation at room temperature. Similarly, very high elongation to failure was achieved at a higher temperature. The increase in the number of SPD passes up to two, leads to increasing the ductility up to 263% at 400°C. Then, an increase in the number of PTCAP passes to three, leads to decrease in the ductility as the results of formation of microvoids when SPD processing at higher equivalent strains without a sufficient hydrostatic compressive stress. Relatively ductile fracture mode was also occurred in all samples.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 1; 159-166
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hot Formability of Heat-Resistant Stainless Steel X15CrNiSi20-12
    Autorzy:
    Kawulok, R.
    Schindler, I.
    Navrátil, H.
    Ševčák, V.
    Sojka, J.
    Konečná, K.
    Chmiel, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/355196.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat-resistant stainless steel
    hot tension test
    nil strength temperature
    nil ductility temperature
    Opis:
    High-temperature plastic properties of heat-resistant stainless steel X15CrNiSi20-12 were assessed on the basis of hot tensile tests and nil strength tests. The results were supported by metallographic analyses using SEM and EDX analysis. The formability of the investigated steel can be divided into roughly three temperature areas. In the temperature range of 900°C to about 1050°C, formability was negatively affected by precipitation of carbide particles at grain boundaries. As the temperature rose to 1200°C, these particles dissolved, resulting in an increase in formability. Further temperature increases resulted in a relatively steep drop in formability caused by overheating of the material. The nil ductility temperature of 1280°C and the nil-strength temperature of 1362°C were determined. The Plastic and strength properties of the investigated material were compared with the deformation behavior of the reference steel X5CrNi18-10, which shows a significantly wider range of suitable forming temperatures.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 727-734
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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