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    Effect of nickel in solid solution on hydrogen transport kinetics in low alloy steels

    75518.pdf (914.4Kb)
    Access Status
    Open access
    Authors
    Husby, H.
    Barnoush, A.
    Iannuzzi, Mariano
    Johnsen, R.
    Date
    2016
    Type
    Conference Paper
    
    Metadata
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    Citation
    Husby, H. and Barnoush, A. and Iannuzzi, M. and Johnsen, R. 2016. Effect of nickel in solid solution on hydrogen transport kinetics in low alloy steels. In EUROCORR 2016, Montpellier, France, 11-15 Sep 2016.
    Source Conference
    EUROCORR 2016
    Faculty
    Faculty of Science and Engineering
    School
    WASM: Minerals, Energy and Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/75296
    Collection
    • Curtin Research Publications
    Abstract

    The use of low alloy steels (LAS) in H2S-containing environments in the oil and gas industry is governed by the ISO standard 15156-2 (NACE MR0175-2). One requirement, which has been disputed over the years, is that the nickel (Ni) content shall not exceed 1 wt%. This work investigated the effect of Ni in solid solution on hydrogen diffusion, solubility, and trapping in ferritic/pearlitic research-grade LAS with nominal Ni contents from 0 to 3 wt%. Hydrogen permeability experiments were carried out in a Devanathan-Stachurski setup at 15, 45 and 70 °C. The effective diffusion coefficients, calculated by the tlag method, decreased with increasing Ni content. The sub-surface hydrogen concentration in lattice and trap sites increased with increasing Ni content. There was no difference between the first and subsequent hydrogen permeation transients, suggesting that Ni in solid solution forms reversible traps. The effect of Ni in refining the microstructure may be superimposed on the effect of Ni in solid solution, and should be investigated in future work.

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