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  • Influence of pitting susceptibility on the nucleation of stress corrosion cracking in high strength austenitic stainless steel at elevated temperatures [Elektronski vir]
    Helmuth, Sarmiento Klapper ; Zajec, Bojan ; Legat, Andraž
    Directional drilling for oil and gas exploration quite often involves chloride-rich streams at elevated temperatures, which challenges the passivity of austenitic CrMn-stainless steels commonly used ... in this application. Once the integrity of the protective passive layer formed on these materials is compromised, together with the presence of tensile stresses, nucleated pits might further propagate in form of cracks by stress corrosion cracking (SCC). In fact, transgranular SCC preceded by pitting is one of the most common cause of failure in drilling equipment manufactured using CrMn-stainless steels. Nevertheless, the factors affecting the transition from passive layer breakdown into propagation by localized corrosion and/or by SCC under typical application conditions are not completely understood. In an attempt to provide additional insights into these factors in-situ electrochemically and optically monitored constant load tests were conducted on one CrMn-stainless steel under simulated drilling conditions at elevated temperatures. Electrochemical results confirmed the susceptibility of the investigated grade to pitting corrosion in the test environments. The pitting susceptibility of the material was confirmed playing a decisive role as precursor for SCC. A synergistic effect between loading conditions and the pitting resistance of the material was also confirmed. Loading conditions led to a significant increase in the susceptibility of the material to localized corrosion.
    Vir: CORROSION 2020 [Elektronski vir] (Str. 1-10)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2020
    Jezik - angleški
    COBISS.SI-ID - 43318787

    Povezava(-e):

    https://www.onepetro.org/conference-paper/NACE-2020-14818

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