Stress Corrosion Cracking Characteristics of a Range of Pipeline Steels in Carbonate-Bicarbonate Solution

Parkins, R. N.; Belhimer, E.; Blanchard, W. K.

doi:10.5006/1.3316023

Cited by 68 publications

(35 citation statements)

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“…Localized plasticity is frequently attributed to absorption of hydrogen produced by cathodic reduction of water accompanying corrosion [5,6]. The present work concerns "high-pH" IGSCC of high-strength low-alloy steels used for pipelines, which occurs in the pH range 8 to 11 in the potential region of active steel dissolution [7][8][9][10]. Attention is focused on the nature and mechanism of material property changes during the early development of intergranular corrosion attack that precedes SCC.…”

Section: Introductionmentioning

confidence: 99%

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

Yavas

Mishra

Alshehri

et al. 2018

Electrochemistry Communications

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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. KeywordsIntergranular corrosion, Dissolution-induced degradation, Stress corrosion cracking, Grain boundary softening, Nanoindentation Disciplines Aerodynamics and Fluid Mechanics | Aerospace Engineering | Nanoscience and Nanotechnology | Structures and Materials CommentsThis 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) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D MA N U S C R I P T AbstractHigh-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 mechanicallydegraded 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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Section: Introductionmentioning

confidence: 99%

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

Yavas

Mishra

Alshehri

et al. 2018

Electrochemistry Communications

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“…However, the field survey shown in Table 1 indicates that the local solution chemistry in the disbonded region varies with pipelines [6]. According to laboratory investigations, the crack velocity during high pH SCC depends on the solution composition, temperature and loading conditions [3][4][5][6][7][8][9][10]. To account on fatigue damage caused by the pressure fluctuations during the operation, Boven et al [11] formulated that the overall crack growth rate as a sum of components due to SCC under sustained loading and fatigue.…”

Section: Introductionmentioning

confidence: 99%

“…In stage 3, the growth of small cracks decelerates with time and the crack coalescence occurs simultaneously [6,10,11]. Modern ILI techniques enable to detect cracks with depth larger than 1 mm or 10% of pipe wall [1].…”

Section: Introductionmentioning

confidence: 99%

“…1). Efforts were made to build a crack growth model for quantitative predicting remaining service life of buried pipelines exposed to concentrated carbonate-bicarbonate solutions, after cracks have been detected [10,[16][17][18], but few has been directly validated by SCC experiments. Recently, the author and his colleagues [19] developed and validated a science-based model for the pipeline steel exposed to concentrated carbonate-bicarbonate solution based on the hypothesis that the cracking is governed by the repeated rupture of passive film at the crack tip.…”

Section: Introductionmentioning

confidence: 99%

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Further study on crack growth model of buried pipelines exposed to concentrated carbonate–bicarbonate solution

2014

Engineering Fracture Mechanics

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“…Cyclic stress has been shown to be deleterious to classical SCC by Parkins et al (1993). Cyclic loading caused a decrease in the threshold stress for a varies.…”

mentioning

confidence: 99%

Effect of Microstructure on Near-Neutral-pH SCC

Bulger

Luo

2000

Volume 2: Integrity and Corrosion; Offshore Issues; Pipeline Automation and Measurement; Rotating Equipment

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Three components are required for stress corrosion cracking: stress, an environment and a susceptible alloy. The environment that causes near-neutral-pH SCC has been established as a dilute bicarbonate environment and the effect of stress on this type of SCC has received a considerable amount of research; however, the third component, the susceptible alloy, has received little research. The effect of microstructure on near-neutral-pH SCC was investigated using the slow strain rate test. The effect of the microstructure on the corrosion properties is also investigated using polarization resistance tests, potentiodynamic scans and electrochemical impedance spectroscopy. The results indicate that the microstructure influences both the SCC and corrosion behaviour.

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Stress Corrosion Cracking Characteristics of a Range of Pipeline Steels in Carbonate-Bicarbonate Solution

Cited by 68 publications

References 1 publication

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

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

Further study on crack growth model of buried pipelines exposed to concentrated carbonate–bicarbonate solution

Effect of Microstructure on Near-Neutral-pH SCC

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