Prediction of stress corrosion cracking (SCC) in nuclear power systems

Andresen, Peter L.; Ford, F. P.

doi:10.1533/9780857093769.4.651

Cited by 10 publications

(9 citation statements)

References 30 publications

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“… The magnitude of SGP-elevated σH/σY decreases with increasing alloy strength and the maximum crack tip σH is essentially constant (6300 MPa or ~0.035E) 4 .…”

Section: Sgp Impact On Hydrogen Crackingmentioning

confidence: 97%

“…Multi-scale model predictions of material properties are important for alloy and process development, material life-cycle optimization, and component performance prognosis [1]. Interdisciplinary advances in deformation processing [2], fatigue [3], stress corrosion cracking (SCC) [4], and hydrogen embrittlement [5] illustrate this cutting-edge approach.…”

Section: Introductionmentioning

confidence: 99%

“…The remaining constants in (1) were justified, including kIG of 0.880 MPa√m from γS for Ni[45]. Since CL is 1 to 50 wppm for Monel K-500 in NaCl solution[45], (1 -CLσ) is essentially 1.0 in(4). The PSGP and MSGP-…”

mentioning

confidence: 99%

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Strain gradient plasticity-based modeling of hydrogen environment assisted cracking

2016

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Finite element analysis of stress about a blunt crack tip, emphasizing finite strain and phenomenological and mechanism-based strain gradient plasticity (SGP) formulations, is integrated with electrochemical assessment of occluded-crack tip hydrogen (H) solubility and two H-decohesion models to predict hydrogen environment assisted crack growth properties.SGP elevates crack tip geometrically necessary dislocation density and flow stress, with enhancement declining with increasing alloy strength. Elevated hydrostatic stress promotes high-trapped H concentration for crack tip damage; it is imperative to account for SGP in H cracking models. Predictions of the threshold stress intensity factor and H-diffusion limited Stage II crack growth rate agree with experimental data for a high strength austenitic Ni-Cu superalloy (Monel K-500) and two modern ultra-high strength martensitic steels (AerMet TM 100 and Ferrium TM M54) stressed in 0.6M NaCl solution over a range of applied potential. For Monel K-500, KTH is accurately predicted versus cathodic potential using either classical or gradient-modified formulations; however, Stage II growth rate is best predicted by a SGP description of crack tip stress that justifies a critical distance of 1 µm. For steel, threshold and growth rate are best predicted using high-hydrostatic stress that exceeds 6 to 8 times alloy yield strength and extends 1 μm ahead of the crack tip. This stress is nearly achieved with a three-length phenomenological SGP formulation, but additional stress enhancement is needed, perhaps due to tip geometry or slip-microstructure.

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“… The magnitude of SGP-elevated σH/σY decreases with increasing alloy strength and the maximum crack tip σH is essentially constant (6300 MPa or ~0.035E) 4 .…”

Section: Sgp Impact On Hydrogen Crackingmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Strain gradient plasticity-based modeling of hydrogen environment assisted cracking

2016

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“…sulphate and chloride) in the primary water have a much stronger role than Cr depletion, even in the absence of oxygen whose role is merely to drive a build-up of such impurities at the advancing crack. 12,13…”

Section: Introductionmentioning

confidence: 99%

Stress corrosion cracking of Ru doped 304 stainless steel in high temperature water

Scenini

Govender

Lyon

et al. 2012

Corrosion Engineering, Science and Technology

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In pressurised water reactor primary water, there is generally growing concern that stress corrosion cracking (SCC) may occur in occluded locations where residual oxygen and other impurities may be trapped. For these critical components, the deployment of more SCC resistant materials is desirable. In this paper, the effect of 1 wt-%Ru additions on the SCC susceptibility of 304 austenitic stainless steels was investigated in high temperature water. Slow strain rate tensile tests were performed on standard and 1 wt-%Ru modified 304 stainless steels in both sensitised and cold worked conditions. Preliminary results showed that, although both ruthenium doped and standard 304 stainless steels exhibited intergranular SCC, the former was less susceptible as indicated by a greater strain to failure. The results obtained suggest an improved performance of the Ru doped 304 stainless steel towards SCC susceptibility in these environments.

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“…Interdisciplinary advances in deformation processing [144], fatigue [145], stress corrosion cracking (SCC) [146], and hydrogen embrittlement [147] illustrate this cutting-edge approach. Internal hydrogen and hydrogen environment assisted cracking degrade high toughness alloys in fracture-critical aerospace, ship, energy, and ground transportation structures [133].…”

Section: Introductionmentioning

confidence: 99%

Strain Gradient Plasticity-Based Modeling of Damage and Fracture

Martínez‐Pañeda¹

2018

Springer Theses

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Prediction of stress corrosion cracking (SCC) in nuclear power systems

Cited by 10 publications

References 30 publications

Strain gradient plasticity-based modeling of hydrogen environment assisted cracking

Strain gradient plasticity-based modeling of hydrogen environment assisted cracking

Stress corrosion cracking of Ru doped 304 stainless steel in high temperature water

Strain Gradient Plasticity-Based Modeling of Damage and Fracture

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