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Initiation of Stress Corrosion Cracks in X80 and X100 Pipe Steels in Near-Neutral pH Environment

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An Erratum to this article was published on 28 June 2016

Abstract

Tests were conducted on X80 and X100 pipe steels at 95% specified minimum yield stress in NS4 solution mixed with soil using specimens machined along the transverse direction of the pipes. Crack initiation in X100 is much easier than in X80. With test time increasing from 110 to 220 days, less numerous but deeper cracks were found in both pipe steels. Cracks showed higher growth rates in the transverse specimens than those in longitudinal ones. TEM results revealed concentration of Ni or Cr elements, formation of oxide layer at crack walls, and TiN-related dissolution at the crack tip.

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Acknowledgments

The support of the Canadian Federal Interdepartmental Program of Energy R&D (PERD) and the funding from CanmetMATERIALS are gratefully acknowledged. Pei Liu, Catherine Bibby, Renata Zavadil, and Jie Liang are thanked for help on various aspects of the experimental work. Discussion with Dr. Yan Li, Dr. Mimoun Elboujdaini, and Mr. Jim Gianetto is gratefully acknowledged. Emile Cottier and Antoine Boudon from ENISE, France, helped in SEM survey of SCC during their internship at CanmetMATERIALS.

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Correspondence to Jidong Kang.

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Kang, J., Zheng, W., Bibby, D. et al. Initiation of Stress Corrosion Cracks in X80 and X100 Pipe Steels in Near-Neutral pH Environment. J. of Materi Eng and Perform 25, 227–240 (2016). https://doi.org/10.1007/s11665-015-1822-5

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  • DOI: https://doi.org/10.1007/s11665-015-1822-5

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