Multiphysics modeling of environment assisted cracking of buried pipelines in contact with solutions of near-neutral pH

Martínez, Edel R.; Tesfamariam, Solomon

doi:10.1016/j.ijpvp.2021.104607

Cited by 3 publications

(4 citation statements)

References 52 publications

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“…Been et al [22] measured the hydrogen concentration of polished and mill scaled X65 by a hydrogen permeation test of 0.73 mol/m 3 and 0.38 mol/m 3 , respectively. Moreover, the hydrogen concentration at the crack tip position would be more elevated due to the strain concentration in front of the crack tip, which was also reported in the literature [23]. The aspects of hydrogen embrittlement in the cracking process have been studied by others [22,24].…”

Section: Scc Mechanism Of 20# X60 and X80 Steels In A Near-neutral Ph...supporting

confidence: 58%

Microstructural Effects in the Development of Near-Neutral pH Stress Corrosion Cracks in Pipelines

Zhang

Ran

Wang³

et al. 2022

Materials

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The corrosion and stress corrosion cracking (SCC) behaviors of 20#, X60, and X80 pipeline steels in a near-neutral pH environment were investigated by means of electrochemical measurement, immersion test, and interrupted slow strain rate tensile (SSRT) test. The propensity for SCC, as indicated by the stress threshold value for crack initiation, was found to be dependent on the type of steel microstructure. Cracks were initiated in the high-strength steel X80 at a stress less than its yield strength, whereas in the other lower-grade steels, the initiation of cracks occurred after the yielding point. The threshold stress of SCC initiation in the near-neutral pH environment for 20#, X60, and X80 steels were 130.64% σys, 106.79% σys, and 86.92% σys, respectively. The SCC of 20# and X60 were characterized by the formation of transgranular and intergranular cracks, while X80 steel was only by transgranular cracking. The occurrence of corrosion had a great effect on crack initiation and the growth at the later stage. The latter involved hydrogen effects. A correlation between SCC sensitivity and the yield strength of the steel has been identified.

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Section: Scc Mechanism Of 20# X60 and X80 Steels In A Near-neutral Ph...supporting

confidence: 58%

Microstructural Effects in the Development of Near-Neutral pH Stress Corrosion Cracks in Pipelines

Zhang

Ran

Wang³

et al. 2022

Materials

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“…It is interesting to note that the 5 µm element size can be found as a typical grain size on the material scale [87]. Furthermore, the use of this characteristic length scale in FEA enabled efficient prediction of corrosion fatigue and fracture [26]. Thus, a mesh with the 5 µm element size offers sufficient precision and consistency for the purposes of this modeling and was used throughout.…”

Section: Parametric Pit Simulationsmentioning

confidence: 99%

“…The description of the occluded chemistry effect and micro-cracks sites are essential to provide electrochemical formalities of the mechanisms associated with AD and HE [21,22]. Pending for a suitable integration of the effects produced by the occluded chemistry, cyclic loads, and nucleation of micro-cracks sites the colony evolution remains poorly understood [21][22][23][24][25][26]. Solving this strongly coupled problem is very challenging because it requires predicting the ratedetermining step under multiple physicochemical processes including mass transport of species to and from the crack tip; the oxidation or reduction reactions at the crack tip, and the dynamic strain processes at the crack tip [24,27].…”

Section: Introductionmentioning

confidence: 99%

“…Phenomenological models, vis-à-vis experimental-based statistical modeling, provide the structure to assess the cracking susceptibility for a wide range of key internal and external variables [1,28,33,42,43]. A variety of computational algorithms have been proposed to individually simulate these stages including non-linear FEM [26], the finite volume method [44], extended FEM [45,46], cohesive zone model [47,48], cellular automata [49], peridynamics [50,51],…”

Section: Introductionmentioning

confidence: 99%

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Phase-field modeling of near-neutral pH stress corrosion crack initiation life in underground pipelines

Martínez

Tesfamariam

2022

Preprint

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A unified phase-field theory is introduced to describe crack initiation and early crack growth due to pitting corrosion of pipelines in contact with near-neutral pH groundwater. The model incorporates a formulation that accounts for stochastic corrosion-induced crack nucleation events at pit sites. This approach supplies a modeling framework to handle the combined effects of electrochemical transformation of the original metal, hydrogen diffusion and resulting embrittlement of the original metal, and mechanical stresses. This is a robust computational approach to tracking the evolving metalelectrolyte interface and embrittlement regions. It was confirmed that dissolved hydrogen into the material promotes crack initiation over a wide potential range and that pitting corrosion, as a precursor of stress corrosion cracking, has a recognizable influence on strength over time. It is expected that this work provides the ground for modeling the pit-to-crack transition required to effectively control very slow crack-in-colonies in pipelines.

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Observations of stress corrosion cracking in pipeline steel in corrosive seawater environment including detailed observation of the crack initiation mechanism

Liu,

Wu,

Gong

et al. 2024

Journal of Electroanalytical Chemistry

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Multiphysics modeling of environment assisted cracking of buried pipelines in contact with solutions of near-neutral pH

Cited by 3 publications

References 52 publications

Microstructural Effects in the Development of Near-Neutral pH Stress Corrosion Cracks in Pipelines

Microstructural Effects in the Development of Near-Neutral pH Stress Corrosion Cracks in Pipelines

Phase-field modeling of near-neutral pH stress corrosion crack initiation life in underground pipelines

Observations of stress corrosion cracking in pipeline steel in corrosive seawater environment including detailed observation of the crack initiation mechanism

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