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Wyszukujesz frazę "carbide precipitation" wg kryterium: Temat

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    Wyświetlanie 1-3 z 3
    Tytuł:
    Quantitative analysis of stability of 9%Cr steel microstructure after long-term ageing
    Autorzy:
    Golański, G.
    Jasak, J.
    Zieliński, A.
    Kolan, C.
    Urzynicok, M.
    Wieczorek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/353244.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high-chromium martensitic steels
    microstructure
    carbide precipitation
    Opis:
    The paper presents the results of research on the microstructure of martensitic X10CrMoVNb9-1 (P91) and X13CrMoCo- VNbNB9-2-1 (PB2) steel subject to long-term ageing at the temperature of 620°C and holding times up to 30 000 hours. The microstructural tests of the examined steel types were performed using a scanning microscope Joel JSM - 6610LV and a transmission electron microscope TITAN 80 - 300. The stability of the microstructure of the investigated steels was analyzed using a quantitative analysis of an image, including measurements of the following: the density of dislocations inside martensite/subgrain laths, the width of martensite laths, and the mean diameter of precipitates. It has been concluded that during long-term ageing, the microaddition of boron in PB2 steel significantly influenced the slowing of the process of degradation of the martensitic steel microstructure, as a result of slowing the process of coagulation of M23C6 carbides and Laves phase. It had a favorable effect on the stabilization of lath microstructure as a result of retardation of the processes of recovery and polygonization of the matrix.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 1; 263-271
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Internal Cracking on Carbide Precipitation in Continuous Casting Bloom Induced by Soft Reduction Technology and the Resulting Segregated Band in Hot-Rolled Wire Rods
    Autorzy:
    Zong, Nanfu
    Jing, Tao
    Liu, Yang
    Powiązania:
    https://bibliotekanauki.pl/articles/2048876.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    internal cracking
    carbide precipitation
    segregated band
    soft reduction technology
    Opis:
    Internal cracking surrounding primary carbides in high carbon steel as-cast blooms induced by soft reduction is investigated to elucidate their influence of internal cracking on carbide precipitation and the resulting segregated band in hot-rolled wire rods. The primary carbides precipitation in high carbon steel has been investigated using both experimental observations and finite element simulations for as-cast blooms induced by soft reduction. It is found that the carbides precipitation in the vicinity of existing internal cracks is often located midway between the surface and centreline of the bloom, further increases the occurrence of the segregated bands in the hot-rolled wire rods. In addition, the growth of primary carbides surrounding the internal cracking are based on the chemical driving force and high density precipitate zones have been clarified in continuous casting bloom induced by soft reduction. It clearly shows that the spatial distribution of internal cracking surrounding primary carbides that play a key role in the formation of the segregated bands in the final steel products.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 1; 73-82
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and corrosion resistance of Co-Cr-Mo alloy used in Birmingham Hip Resurfacing system
    Autorzy:
    Dobruchowska, E.
    Paziewska, M.
    Przybyl, K.
    Reszka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/306647.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    stopy kobaltu
    stopy chromu
    stopy molibdenu
    karbid
    odporność korozyjna
    polaryzacja potencjodynamiczna
    stal nierdzewna
    stal azotowana
    cobalt-chromium-molybdenum alloy
    Birmingham Hip Resurfacing
    carbide
    precipitation
    corrosion resistance
    potentiodynamic polarisation
    nitrided stainless steel
    Opis:
    The endoprostheses made of cobalt-chromium-molybdenum (Co-Cr-Mo) alloys belong to the group of the most popular metallic implants used for hip joints reconstruction. For such biomaterials, the primary goal is correct and long-term functioning in the aggressive environment of body fluids. Therefore, the purpose of this study was to examine both the morphology and the corrosion resistance of implants made of the cobalt alloy used in Birmingham Hip Resurfacing (BHR) system (Smith & Nephew). For comparative purposes, the electrochemical studies were done for the nitrided stainless steel – Orthinox. Methods: Observations of the microstructure of the investigated material were performed by means of the optical metallographic microscope and the scanning electron microscope. Furthermore, Energy Dispersive X-ray Spectroscopy was used to analyse the chemical composition of the endoprosthesis. Characterisation and evaluation of electrochemical corrosion resistance of the selected alloys were performed by potentiodynamic polarisation tests. Results: The structural studies confirmed that Co-Cr-Mo (BHR system) is characterised by a typical dendritic microstructure with carbide precipitates, mainly M23C6, within the interdendritic areas. Results of the polarisation measurements showed that the investigated cobalt alloy exhibits lower corrosion potential than Orthinox in the utilised environments (3% NaCl, simulated body fluid – Hank’s Body Fluid). Conclusions: However, the high passivation ability of the Co-Cr-Mo alloy, as well as its resistance to the initiation and propagation of localised corrosion processes, indicate that this material is significantly more appropriate for long-term implants.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2017, 19, 2; 31-39
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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