The influence of the strain-rate on the stress corrosion cracking of alloy 600 in high temperature primary water

Boursier, J.M.; Desjardins, D.; Vaillant, François Le

doi:10.1016/0010-938x(94)00158-3

Cited by 54 publications

(22 citation statements)

References 7 publications

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“…Many factors affecting corrosion rate and cracks growth were studied by several authors [74][75][76][77][78][79][80][81][82][83]. Nevertheless, the contribution of the oxide layers themselves remains crucial and is still suffering from a lack of understanding.…”

Section: State Of the Artmentioning

confidence: 99%

Using Microscopy to Help with the Understanding of Degradation Mechanisms Observed in Materials of Pressurized Water Reactors

Legras¹,

Volgin²,

Radiguet³

et al. 2017

JMSE-B

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Abstract:Even if temperature, pressure and chemistry of the cooling water are not very high and aggressive, materials used in PWRs (Pressurized Water Reactors) are exposed to different degradation mechanisms. One of the main goals of the research programs in this field is to develop physical model of the mechanisms down to the atomic scale. Such approach needs a clear description and understanding of the degradation mechanisms at the same small scale. This paper illustrates the benefits of different microscopies and of their last improvements up to the promising possibilities of monochromated and aberrations corrected TEM/STEM. A specific focus is placed on four different degradation mechanisms observed in austenitic stainless steel: irradiation ageing, corrosion fatigue, stress corrosion cracking and corrosion.

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Section: State Of the Artmentioning

confidence: 99%

Using Microscopy to Help with the Understanding of Degradation Mechanisms Observed in Materials of Pressurized Water Reactors

Legras¹,

Volgin²,

Radiguet³

et al. 2017

JMSE-B

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“…In addition, the CD65 ϩ GBC alloy has an integrated cracking damage that is 15 times lower than that of the CD65 alloy in primary water containing 1 bar hydrogen, but exhibits a higher creep rate. Boursier et al [5] also found that the SCC susceptibility of alloy 600 was not directly linked to the macroscopic creep rate. As is the case for this study, the SCC resistance could be linked to the presence of IG carbides rather than to the creep rate.…”

Section: B the Effects Of Carbon And Grain Boundary Carbides On Igsccmentioning

confidence: 98%

“…Leclercq and Vaillant [4] found that alloy 600 tubing containing mostly grain boundary carbides exhibited a lower creep rate at 350 ЊC than tubing containing mostly matrix carbides. Boursier et al, [5] however, reported that a post anneal thermal treatment at 700 ЊC for 16 hours, resulting in extensive grain boundary carbide precipitation, increased the creep rate of alloy 600 compared to the mill-annealed condition. Since the amounts of carbon in solution and as carbides are interdependent and undefined in commercial alloy 600, it has only been possible to determine general trends for the creep and cracking behaviors for different carbon distributions.…”

Section: Introductionmentioning

confidence: 99%

Isolation of carbon and grain boundary carbide effects on the creep and intergranular stress corrosion cracking behavior of Ni−16Cr−9Fe−xC alloys in 360 °C primary water

Hertzberg

Was

1998

Metall Mater Trans A

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The influence of carbon and grain boundary carbides on intergranular stress corrosion cracking (IGSCC) of controlled-purity Ni-16Cr-9Fe-xC alloys in 360 ЊC primary water was investigated using constant load tensile (CLT) and constant extension rate tensile (CERT) tests. The CLT test results confirmed that carbon in solution decreases the creep rate by several orders of magnitude, while grain boundary carbides serve to increase the creep susceptibility. Although carbon increases the work hardening rate, it is demonstrated, using the Bailey-Orowan creep model, that the primary effect of carbon in solution is to delay the recovery process of climb at the grain boundary, thereby reducing the creep rate. Grain boundary carbides produce a negligible contribution to the internal stress and may increase the creep rate by acting as dislocation sources. Grain boundary carbide precipitation increases IGSCC resistance in 360 ЊC primary water containing 0, 1, and 18 bar hydrogen, providing the highest overall resistance to both environmentally induced creep and cracking. The magnitude of the beneficial effect of grain boundary carbides is extremely sensitive to hydrogen overpressure, with the largest influence observed for 1 bar hydrogen. The detrimental effect of hydrogen on IGSCC shows consistencies with aspects of both film rupture/slip dissolution and hydrogen embrittlement models.

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“…The model describing this second phase is linear in time [8]. This second phase can also be considered as the "threshold region" among the fatigue crack regions described by NASGRO equations [13], [43].…”

Section: Multi Model Systemmentioning

confidence: 99%

Interacting multiple-models, state augmented Particle Filtering for fault diagnostics

Compare

Baraldi

Turati

et al. 2015

Probabilistic Engineering Mechanics

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Particle Filtering (PF) is a model-based, filtering technique, which has drawn the attention of the Prognostic and Health Management (PHM) community due to its applicability to nonlinear models with non-additive and non-Gaussian noise. When multiple physical models can describe the evolution of the degradation of a component, the PF approach can be based on Multiple Swarms (MS) of particles, each one evolving according to a different model, from which to select the most accurate a posteriori distribution. However, MS are highly computational demanding due to the large number of particles to simulate. In this work, to tackle the problem we have developed a PF approach based on the introduction of an augmented discrete state identifying the physical model describing the component evolution, which allows to detect the occurrence of abnormal conditions and identifying the degradation mechanism causing it. A crack growth degradation problem has been considered to prove the effectiveness of the proposed method in the detection of the crack initiation and the identification of the occurring degradation mechanism. The comparison of the obtained results with that of a literature MS method and of an empirical statistical test has shown that the proposed method provides both an early detection of the crack initiation, and an accurate and early identification of the degradation mechanism. A reduction of the computational cost is also achieved.2

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The influence of the strain-rate on the stress corrosion cracking of alloy 600 in high temperature primary water

Cited by 54 publications

References 7 publications

Using Microscopy to Help with the Understanding of Degradation Mechanisms Observed in Materials of Pressurized Water Reactors

Using Microscopy to Help with the Understanding of Degradation Mechanisms Observed in Materials of Pressurized Water Reactors

Isolation of carbon and grain boundary carbide effects on the creep and intergranular stress corrosion cracking behavior of Ni−16Cr−9Fe−xC alloys in 360 °C primary water

Interacting multiple-models, state augmented Particle Filtering for fault diagnostics

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