Aerospace Engineering, Chemical and Biological Engineering, Materials Science and Engineering, Mechanical Engineering
Journal or Book Title
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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Yavas, Denizhan; Mishra, Pratyush; Alshehri, Abdullah; Shrotriya, Pranav; Hebert, Kurt R.; and Bastawros, Ashraf F., "Nanoindentation study of corrosion-induced grain boundary degradation in a pipeline steel" (2018). Aerospace Engineering Publications. 108.