Morphology and stress evolution during the initial stages of intergranular corrosion of X70 steel

dc.contributor.author Yavas, Denizhan
dc.contributor.author Alshehri, Abdullah
dc.contributor.author Mishra, Pratyush
dc.contributor.author Shrotriya, Pranav
dc.contributor.author Hebert, Kurt
dc.contributor.author Bastawros, Ashraf
dc.contributor.department Aerospace Engineering
dc.contributor.department Mechanical Engineering
dc.contributor.department Materials Science and Engineering
dc.contributor.department Chemical and Biological Engineering
dc.date 2019-11-07T23:02:58.000
dc.date.accessioned 2020-06-29T22:45:25Z
dc.date.available 2020-06-29T22:45:25Z
dc.date.copyright Mon Jan 01 00:00:00 UTC 2018
dc.date.embargo 2019-07-30
dc.date.issued 2018-09-20
dc.description.abstract <p>Pipeline steels are vulnerable to stress corrosion cracking (SCC) during intergranular corrosion (IGC) at potentials of active dissolution in moderately alkaline carbonate-bicarbonate solutions. Morphology evolution accompanying IGC has not been fully described, despite the relevance of the corrosion geometry to crack initiation. The present article reports a characterization of concurrent morphology and mechanical stress development during the initial stages of IGC of X70 steel in sodium bicarbonate solution, in the potential range of high SCC susceptibility. Morphology was revealed by scanning electron microscope examination of cross sections through the IGC layer, and stress evolution was monitored by curvature interferometry. At potentials in the range of SCC susceptibility, IGC creates triangular wedges of porous corrosion product centered at grain boundary triple junctions. The wedge shape indicates a higher corrosion rate at the grain boundary compared to the grain surfaces. Compressive stress is generated during IGC due to internal oxidation on grain surfaces forming a thin compact corrosion product layer. Polarization at a potential below the SCC range resulted in selective grain dissolution with no internal corrosion product or compressive stress increase. Silicon solute atoms are selectively oxidized into the compact grain boundary corrosion product film.</p>
dc.description.comments <p>This is a manuscript of an article published as Yavas, Denizhan, Abdullah Alshehri, Pratyush Mishra, Pranav Shrotriya, Ashraf F. Bastawros, and Kurt R. Hebert. "Morphology and stress evolution during the initial stages of intergranular corrosion of X70 steel." <em>Electrochimica Acta </em>285<em> </em>(2018): 336-343. DOI: <a href="http://dx.doi.org/10.1016/j.electacta.2018.07.207" target="_blank">10.1016/j.electacta.2018.07.207</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/aere_pubs/124/
dc.identifier.articleid 1125
dc.identifier.contextkey 12759724
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath aere_pubs/124
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/1968
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/aere_pubs/124/2018_Bastawros_MorphologyStress.pdf|||Fri Jan 14 19:20:57 UTC 2022
dc.source.uri 10.1016/j.electacta.2018.07.207
dc.subject.disciplines Aerospace Engineering
dc.subject.disciplines Chemical Engineering
dc.subject.disciplines Mechanical Engineering
dc.subject.disciplines Metallurgy
dc.subject.disciplines Structures and Materials
dc.subject.keywords High-strength steel alloys
dc.subject.keywords Intergranular corrosion
dc.subject.keywords Stress corrosion cracking
dc.subject.keywords Pipeline steel
dc.title Morphology and stress evolution during the initial stages of intergranular corrosion of X70 steel
dc.type article
dc.type.genre article
dspace.entity.type Publication
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