Localized Surface Plasticity During Stress Corrosion Cracking

Jones, D. A.

doi:10.5006/1.3292123

Cited by 43 publications

(20 citation statements)

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“…Another possibility, suggested by Jones [89,90], is that di-vacancies accumulate along low-index crystallographic planes and promote cleavage. Yet another suggestion is that vacancies within the fi rst few atomic layers at crack tips facilitate dislocation emission or decohesion by affecting surface/near-surface bonding [91,92].…”

Section: Vacancy-based Mechanismsmentioning

confidence: 98%

Mechanistic and fractographic aspects of stress-corrosion cracking (SCC)

Lynch

2011

Stress Corrosion Cracking

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Section: Vacancy-based Mechanismsmentioning

confidence: 98%

Mechanistic and fractographic aspects of stress-corrosion cracking (SCC)

Lynch

2011

Stress Corrosion Cracking

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“…This phenomenon may result from the small cracks formed on the surface of the postyielding specimen when exposed to the corrosive solution during SSRT testing or the effect of anodic dissolution-induced surface plasticity. [24] The latter may be caused by enhanced dislocation mobility as well as an increasing number of vacancies induced by anodic dissolution on the surface. [16] …”

Section: A Effect Of Plastic Prestrain On Scc Susceptibilitymentioning

confidence: 99%

“…Experimental evidence has indicated that both anodic dissolution and dissolved hydrogen in a steel play important roles in near-neutral pH SCC. [11,[14][15][16][17] Although experimental observations on the impact of plastic prestrain or cold work on the anodic dissolution rate of pipeline steels in simulated near-neutral pH groundwater are contradictory, [16,24,29] thermodynamic analysis has indicated that such an effect is limited. [16] Plastic prestrain will introduce more crystalline defects, such as vacancies and dislocations.…”

Section: Effect Of Microstructure and Yield Strength On Scc Suscepmentioning

confidence: 99%

Near-Neutral pH Stress Corrosion Cracking Susceptibility of Plastically Prestrained X70 Steel Weldment

Luo

Ivey

2010

Metall Mater Trans A

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The application of strain-based design for pipelines requires comprehensive understanding of the postyield mechanical behavior of materials. In this article, the impact of plastic prestrain on near-neutral pH stress corrosion cracking (SCC) susceptibility of welded X70 steel was investigated with a slow strain rate tensile (SSRT) test. Generally, plastic prestrain reduces the SCC resistance in various welded zones. The SCC susceptibility of the test materials can be put in the following order: heat-affected zone (HAZ) > weld metal (WM) > base metal (BM). Fractographic analysis indicates that there are two cracking modes, mode I and mode II, during SSRT tests. Mode I cracks propagate along the direction perpendicular to the maximum tensile stress, and mode II cracks lie in planes roughly parallel to the plane where the maximum shear exists. The SCC of the BM is governed by mode I cracking and fracture of the HAZ, and the WM is dominated by mode II cracking. Damage analysis shows that the detrimental impact of plastic prestrain on the residual SCC resistance cannot be evaluated with the linear superposition model. A plastic prestrain sensitivity, a material constant independent of plastic prestrain, is proposed to characterize the susceptibility of SCC resistance to plastic prestrain, and it increases with the SCC susceptibility of the steels. The enhanced SCC susceptibility caused by plastic prestrain may be related to an increase in yield strength. The correlation of the ratio of the reduction in area in NS4 solution to that in air (RA SCC /RA air ) with the yield strength is microstructure dependent.

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“…Some researchers believed that the degradation of resistance to plastic deformation in surface layers is a consequence of increasing vacancies in the surface layer produced through anodic dissolution [2,28,31,[36][37][38]. Gutman [28,32] pointed out that changing the vacancy density in the surface layer may alter its chemical potential and thereby increase the mobility of dislocations.…”

Section: Corrosion-induced Surface Hardness Degradation and Corrosionmentioning

confidence: 99%

“…The reduced resistance to plastic deformation in surface layer has been well demonstrated by the insitu micro-and nano-hardness measurements [9,[32][33][34][35]. This fact suggests that the impingement of a particle with identical momentum would create a larger crater in a corroding medium, resulting in a higher erosion rate [4,28,[36][37]. Based on theories of irreversible thermodynamics, dislocation kinetics, materials strength and electrochemistry, the reduction of surface hardness due to the presence of anodic dissolution Hv ∆ (< 0) can be formulated as follows [4,9,28,32]:…”

Section: Introductionmentioning

confidence: 96%