Nanoindentation study of corrosion-induced grain boundary degradation in a pipeline steel

Date
2018-03-01
Authors
Bastawros, Ashraf
Shrotriya, Pranav
Yavas, Denizhan
Mishra, Pratyush
Alshehri, Abdullah
Shrotriya, Pranav
Hebert, Kurt
Bastawros, Ashraf
Hebert, Kurt R
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Altmetrics
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Aerospace Engineering
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Mechanical Engineering
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Aerospace EngineeringMechanical EngineeringMaterials Science and EngineeringChemical and Biological Engineering
Abstract

High-strength low-alloy steels used for oil and gas pipelines are vulnerable to intergranular stress corrosion cracking in moderately alkaline soils. The mechanism of corrosion-induced embrittlement under such conditions is not yet understood. Nanoindentation was used to detect localized degradation of mechanical properties near internal grain boundaries of X-70 steel undergoing intergranular corrosion at active dissolution potentials at pH 8.2. The measurements identified a one-micron thick mechanically-degraded layer with 25% reduced hardness near corroded grain boundaries. It is suggested that the corrosion process may introduce an active softening agent, possibly non-equilibrium lattice vacancies generated by oxidation.

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This is a manuscript of an article published as Yavas, Denizhan, Pratyush Mishra, Abdullah Alshehri, Pranav Shrotriya, Kurt R. Hebert, and Ashraf F. Bastawros. "Nanoindentation study of corrosion-induced grain boundary degradation in a pipeline steel." Electrochemistry Communications 88 (2018): 88-92. doi: 10.1016/j.elecom.2018.02.001. Posted with permission.

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