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    Effect of tungsten on the precipitation kinetics and localized corrosion resistance of super duplex stainless steels

    Access Status
    Fulltext not available
    Authors
    Bernås, M.
    Westermann, I.
    Johnsen, R.
    Torres, C.
    Jernberg, A.
    Qvale, A.
    Iannuzzi, Mariano
    Date
    2018
    Type
    Conference Paper
    
    Metadata
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    Citation
    Bernås, M. and Westermann, I. and Johnsen, R. and Torres, C. and Jernberg, A. and Qvale, A. and Iannuzzi, M. 2018. Effect of tungsten on the precipitation kinetics and localized corrosion resistance of super duplex stainless steels.
    Source Title
    NACE - International Corrosion Conference Series
    ISBN
    9781510864405
    URI
    http://hdl.handle.net/20.500.11937/73045
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 by NACE International. Although extensively used in oil and gas production due to their excellent combination of mechanical properties and corrosion resistance, 25Cr super duplex stainless steels (SDSSs) are susceptible to the precipitation of deleterious phases during heat treatment and welding. Deleterious phases, in turn, affect both localized corrosion resistance and mechanical properties. Much debate still exists as to whether alloying elements such as tungsten accelerate or retard the formation of detrimental precipitates. In this work, the effect of W on the precipitation kinetics of three 25Cr SDSS grades, namely, UNS S32750 (W-free), S32760 (Low-W), and S39274 (High-W) was quantified in Time-Temperature-Transformation (TTT) diagrams. Optical microscopy, scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), and Electron backscatter diffraction (EBSD) were used to characterize the microstructure evolution and construct the TTT diagrams. The effect of intermetallic compounds (IMCs) and tertiary phases on localized corrosion resistance was investigated as a function of volume fraction and type of precipitate, with a focus on s- and ?-phase formation. The localized corrosion resistance of the various metallurgical stages was determined using open circuit potential measurements as a function of temperature during immersion in 6 wt% FeCl3 pH = 1.0. The s-phase precipitation rate was slower in the High-W SDSS compared to the other alloys, possibly due to ?-phase precipitation at grain boundaries. At 846°C, the isothermal heating time required to observe a drop in Critical Pitting Temperature (CPT) doubled for the High-W SDSS. The implications of these findings in materials selection for oil and gas production equipment are discussed.

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