Formulating stress corrosion cracking growth rates by combination of crack tip mechanics and crack tip oxidation kinetics

Shoji, Tetsuo; Lu, Zhanpeng; Murakami, Hiroyoshi

doi:10.1016/j.corsci.2009.10.041

Cited by 145 publications

(36 citation statements)

References 30 publications

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“…Oxygen-Fe layers are formed on the surface of specimen due to the presence of atmospheric oxygen at 700 °C. The formed oxide layer lowered the thermal expansion of the material and increased its volume and fragility [29,33,34]. The oxygen concentration in Figure 5 changed significantly in Region I, but after 1850 cycles, the oxygen weight of Region II became less than that of the Region I Figure 5a-c showed the decrease in oxygen weight 33% with an increased number of thermal wear cycle (3000 and 5000 cycles).…”

Section: Energy Dispersive X-ray Spectroscopy (Edxs) Analysismentioning

confidence: 93%

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Thermally-Induced Crack Evaluation in H13 Tool Steel

Abdulhadi

Ahmad

Ismail

et al. 2017

Metals

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This study reported the effect of thermal wear on cylindrical tool steel (AISI H13) under aluminum die-casting conditions. The AISIH13 steels were immersed in the molten aluminum alloy at 700 • C before water-quenching at room temperature. The process involved an alternating heating and cooling of each sample for a period of 24 s. The design of the immersion test apparatus stylistically simulated aluminum alloy dies casting conditions. The testing phase was performed at 1850, 3000, and 5000 cycles. The samples were subjected to visual inspection after each phase of testing, before being examined for metallographic studies, surface crack measurement, and hardness characteristics. Furthermore, the samples were segmented and examined under optical and Scanning Electron Microscopy (SEM). The areas around the crack zones were additionally examined under Energy Dispersive X-ray Spectroscopy (EDXS). The crack's maximum length and Vickers hardness profiles were obtained; and from the metallographic study, an increase in the number of cycles during the testing phase resulted in an increase in the surface crack formation; suggesting an increase in the thermal stress at higher cycle numbers. The crack length of Region I (spherically shaped) was about 47 to 127 µm, with a high oxygen content that was analyzed within 140 µm from the surface of the sample. At 700 • C, there is a formation of aluminum oxides, which was in contact with the surface of the H13 sample. These stresses propagate the thermal wear crack length into the tool material of spherically shaped Region I and cylindrically shape Region II, while hardness parameters presented a different observation. The crack length of Region I was about 32% higher than the crack length of Region II.

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Section: Energy Dispersive X-ray Spectroscopy (Edxs) Analysismentioning

confidence: 93%

“…Oxygen-Fe layers are formed on the surface of specimen due to the presence of atmospheric oxygen at 700 • C. The formed oxide layer lowered the thermal expansion of the material and increased its volume and fragility [29,33,34].…”

Section: Energy Dispersive X-ray Spectroscopy (Edxs) Analysismentioning

confidence: 99%

Thermally-Induced Crack Evaluation in H13 Tool Steel

Abdulhadi

Ahmad

Ismail

et al. 2017

Metals

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“…Actually, K I is commonly used in SCC models [4,15] valid [16]. Moreover, chemical damage at the crack tip can be governed by the crack mouth opening or the emergence of slip bands.…”

Section: Introductionmentioning

confidence: 99%

Methodology for a mechano-electrochemical evaluation of the coupling at the crack tip. Application of halide-induced Stress Corrosion Cracking of Zircaloy-4

et al. 2015

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a b s t r a c tIn order to evaluate the relative contribution of both mechanical and electrochemical processes at the crack tip during Stress Corrosion Cracking propagation, an original combination of controlled pre-cracking followed by thermal pre-oxidation of SCC specimens was developed. It allowed localizing dissolution at the crack tip for Zircaloy-4 tested in halide solutions under potentiostatic polarization. Digital Image Correlation and electrochemical methods were then carried out to study correlations between the stress intensity factor, the crack length and the measurements of dissolution current.

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“…In this model, SCC is regarded as the result of localized oxidation enhanced by stress/strain, and the crack tip strain rate is expressed as a unique parameter to cause the physical degradation of the interfacial film. Many attempts have been made to acquire the stress state of the crack tip due to its importance [6,7]; however, the stress and strain are obtained macroscopically based on the assumption that the materials are isotropic and homogeneous in terms of elastic deformation when the materials have random crystallographic and morphologic texture. In fact, the crack tip stress state is significantly affected by the microstructure of materials due to the misorientation and anisotropic of each component crystal, and the crack tip would have a nonuniform stress at the microstructural level even under a uniform remote stress condition [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, intergranular stress corrosion cracking (IGSCC) has occurred in many internal components made up of stainless steel, nickel alloy, and their weld metals [1][2][3][4]. e slip/dissolution-oxidation model has been widely accepted as a reasonable description of SCC in an oxygenated aqueous system [5][6][7]. In this model, SCC is regarded as the result of localized oxidation enhanced by stress/strain, and the crack tip strain rate is expressed as a unique parameter to cause the physical degradation of the interfacial film.…”

Section: Introductionmentioning

confidence: 99%

Effects of Grain Orientation on Stress State near Grain Boundary of Austenitic Stainless Steel Bicrystals

Yang

Xue

Zhao

et al. 2018

Advances in Materials Science and Engineering

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e stress state at the crack tip of structural components in nuclear power plants used in the SCC quantitative prediction models is based on the assumption that the polycrystalline material is isotropic and homogeneous at present. However, the crystals in polycrystalline materials are anisotropic with different orientations, which would induce a nonuniform stress to cause the initiation and propagation of SCC. By using a finite element method, the elastic responses of anisotropic behaviors of austenitic stainless steel bicrystals are studied. e results indicate that the stress distribution near GBs depends strongly on the crystal orientation. A larger Mises stress concentration exists on the GB with larger stiffness along the load direction. e Mises stress difference is higher in the bicrystal with bigger elastic modulus difference of two neighboring grains along the tensile axis. In the bicrystal with GB perpendicular to the tensile axis, the grain orientation has little effects on the Mises stress far from the GB in both grains. e strain inconsistency in bicrystals is affected by the mismatch of two neighboring grains. e larger the elastic modulus differences between two neighboring grains caused by misorientation, the larger the strain inconsistency in the bicrystal.

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Formulating stress corrosion cracking growth rates by combination of crack tip mechanics and crack tip oxidation kinetics

Cited by 145 publications

References 30 publications

Thermally-Induced Crack Evaluation in H13 Tool Steel

Thermally-Induced Crack Evaluation in H13 Tool Steel

Methodology for a mechano-electrochemical evaluation of the coupling at the crack tip. Application of halide-induced Stress Corrosion Cracking of Zircaloy-4

Effects of Grain Orientation on Stress State near Grain Boundary of Austenitic Stainless Steel Bicrystals

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