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Wyszukujesz frazę "MnS" wg kryterium: Temat

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Modeling of the Mn and S Microsegregation During Continuous Casting of Rail Steel
    Modelowanie procesu segregacji Mn i S podczas odlewania stali szynowej
    Autorzy:
    Gerasin, S.
    Kalisz, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/382398.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    MnS precipitates
    segregation process
    computer simulation
    rail steel
    wydzielenia MnS
    proces segregacji
    symulacja komputerowa
    stal szynowa
    Opis:
    The aim of this study was to analyze the process of manganese sulfide formation based on thermodynamics calculation. Both experimental and theoretical analysis methods were used in this work. Computer simulation with the use of non-commercial software was used for the calculation of the process of segregation of manganese and sulfur and MnS non-metallic particles precipitates in liquid steel during solidification of ingot. The curves illustrating the inclusion formation process are presented. MnS inclusions are disposed along grain boundaries in thin layers and have a rounded shape.
    W pracy analizowano proces powstawania siarczku manganu w oparciu o obliczenia termodynamiczne. Wyniki przedstawiono w odniesieniu do badań eksperymentalnych. Symulacje komputerowe procesu segregacji manganu i siarki oraz powstawania wydzieleń MnS podczas krzepnięcia stali zostały wykonane za pomocą nie komercyjnego programu komputerowego. Rezultaty symulacji komputerowej przedstawiono w postaci wykresów prezentujących segregację składników oraz krzywych obrazujących proces powstawania wydzieleń. Wtrącenia MnS są rozmieszczone wzdłuż granic ziaren i mają zaokrąglony kształt.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 4 spec.; 35-38
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computer Simulation of Microsegregation of Sulphur and Manganese and Formation of MnS Inclusions while Casting Rail Steel
    Autorzy:
    Kalisz, D.
    Gerasin, S.
    Bobrowski, P.
    Żak, P. L.
    Skowronek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/355990.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification
    stal szynowa
    MnS precipitates
    Opis:
    The quality of rail steel is conditioned by its high mechanic qualities, which greatly depend on the presence of undesired nonmetallic inclusions. The paper is devoted to the segregation of components, mainly sulphur, and the formation of manganese sulphide in the process of steel solidification, at the casting rate of 100 and 500 K/min. Sulphur is a steel component which disadvantageously influences its numerous parameters. The oxide-sulphide and sulphide precipitations cause cracks and lower the strength of the material. This phenomenon was modeled with the use of author’s computer program based on Matsumiya interdendritic microsegregation model. The main assumptions of this model and thermodynamic conditions of inclusion formation during casting of steel are discussed in this paper. Two cases were analyzed: in the first one the MnS was assumed to form a pure and constant compound, whereas in the other one the manganese sulfide was precipitated as a component of a liquid oxide solution, and its activity was lower than unity. The final conclusion is that chemical composition of steel is the major parameter deciding about the formation of MnS inclusions.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 4; 1939-1944
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Characterization of Manganese Sulphide Thin Films by Chemical Bath Deposition Method
    Autorzy:
    Geetha, G.
    Murugasen, P.
    Sagadevan, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030049.pdf
    Data publikacji:
    2017-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    MnS thin films
    XRD
    SEM
    dielectric studies
    Opis:
    Manganese sulphide (MnS) thin films were prepared by chemical bath deposition method. X-ray diffraction analysis was used to study the structure and the crystallite size of MnS thin films. The grain size and the surface morphology were studied using scanning electron microscopy. The optical properties were studied using the UV-visible absorption spectrum. The dielectric properties of MnS thin films were studied for different frequencies and different temperatures. Further, electronic properties, such as valence electron plasma energy, average energy gap or the Penn gap, the Fermi energy and electronic polarizability of the MnS thin films were calculated. The ac electrical conductivity study revealed that the conduction depended both on the frequency and the temperature. The temperature dependent conductivity study confirmed the semiconducting nature of the films.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 4; 1221-1226
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Mg and Ca on the Characteristics of Inclusions in Sulphur Steel
    Autorzy:
    Tian, J.
    Qu, T.
    Wang, D.
    Wang, H.
    Xu, Z.
    Xinrui, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/355348.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Mg treatment
    Ca treatment
    MnS
    complex sulfide
    inclusions
    Opis:
    The effects of Mg and Ca on sulfide modification of sulphur steel were studied to elucidate the difference between micromagnesium treatment and micro-calcium treatment for the inclusion of sulphur steel. The results show that the inclusions in the steel appeared with an oxide core of Al2O3 and MnS wrapped. After the addition of Mg, the core was changed to spinel, and the MnS coating was changed to Mn-Mg-S. After Ca was added, the core was changed to Ca-Al-O, and the MnS coating was changed to Mn-Ca-S. The Mg content was higher than Ca content in the sulfides of the steel. Therefore, Mg was more effective than Ca in terms of sulfide modification with the same content of Mg and Ca in steel, but the yielding rate of Mg was lower than that of Ca. The Mg content in the oxide core was higher than Mg of the coating of the inclusions in the steel treated with Mg or Mg-Ca. In contrast, the Ca content in the oxide core was lower than Ca of the coating of the inclusions in the steel treated with Ca or Mg-Ca. MnS formed and precipitated during the melt solidification process. The complex sulfide (Mg-Mn-S) was precipitated around MgO·Al2O3 in the Mg treated steel during the cooling process. CaS inclusion was precipitated on the CaO·Al2O3 inclusions in the liquid Ca-treated steel. Thus, CaS was formed first, whereas MnS was formed during the cooling process, followed by the formation of complex sulfide (CaS+MnS), which finally precipitated around CaO·Al2O3 in the Ca-treated steel.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 1599-1607
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formation Mechanism for the TiN-MnS Complex Inclusions in Tire Cord Steel
    Autorzy:
    Lei, Jialiu
    Wang, Xiumin
    Zhao, Dongnan
    Fu, Yongjun
    Powiązania:
    https://bibliotekanauki.pl/articles/1837727.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    tire cord steel
    thermodynamic calculations
    inclusions
    TiN-MnS
    formation mechanism
    kord stalowy
    obliczenia termodynamiczne
    inkluzje
    Opis:
    High strength tire cord steel is extensively used in radial ply tyres as the framework material, but the presence of brittle single titanium inclusions or complex titanium inclusions can cause failure of the wires and jeopardize their performance in production. In order to provide a key guidance on the control of titanium inclusions, it is necessary to clarify their formation mechanism during solidification. In the present work, the thermodynamic calculations were employed for an elaboration on their formation mechanism, combined with the industrial test. The TiN-MnS complex inclusions observed by SEM-EDS shows that the internal corresponds to TiN and the external is MnS. Thermodynamic calculations based on the microsegregation model indicate that MnS forms first, which can act as a nucleation site for the co-deposit of TiN in the mushy zone. As the MnS inclusions have a better deformation than that of TiN inclusions, then the TiN inclusions are wrapped by the MnS inclusions, generating TiN-MnS complex inclusions after rolling.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 2; 65-69
    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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