An ATEM study of oxidation behavior of SCC crack tips in 304L stainless steel in high temperature oxygenated water

Lu, Yonghao; Peng, Qunjia; Sato, Tsugio; Shoji, Tetsuo

doi:10.1016/j.jnucmat.2005.07.006

Cited by 57 publications

(13 citation statements)

References 30 publications

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“…In case of the specimen without pre-existing oxide layer, since protective oxide layer started to form after starting the test and under no further deformation of substrate metal, cracking of this oxide layer was then hardly be occurred. In cases of dynamic SCC test ( 5)-( 7) (9) and slow strain rate test (SSRT) (15) (18) , oxide film breakage at the crack tip could be also occurred by load pattern change or load increasing step and then SCC crack growth could be accelerated. Further study is required to investigate the role of oxide film breakage and reformation on SCC behavior, especially for small surface cracks.…”

Section: Constant Load Testmentioning

confidence: 99%

“…Due to lifetime extension of BWR, since integrity evaluation is one of the most serious problems to be taken into consideration, the behavior of these existing stress corrosion cracks, regardless of small one or long one, must be clarified to guarantee the safety of the system. So far, many researchers have studied the stress corrosion cracking behavior of long crack in austenitic stainless steels under simulated BWR environment using CT specimen together with AC or DC potential drop techniques for crack length measurement (5)- (8) and proposed models to explain SCC behavior (9)- (11) . Furthermore, relationship between crack growth rate (da/dt) and stress intensity factor (K) has been successfully obtained and compared with the existing reference curves, such as the JSME code for Nuclear Power Generation Plants (12) , the NRC NUREG-0313 Rev.2 (13) and the Swedish Nuclear Power Inspectorate's Regulations SKIFS (14) .…”

Section: Introductionmentioning

confidence: 99%

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Failure Behavior of Sensitized SUS304 Stainless Steel with Small Surface Pre-Crack under Constant Load Condition in Simulated BWR Environment

Saengsai

Otsuka

Mutoh

2011

JMMP

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Small surface intergranular cracks similar to those detected in the heat affected zone of the welded components of primary water recirculation loop for boiling water reactor (BWR) were introduced on the surface of sensitized SUS304 stainless steel by using a fretting fatigue technique, where multiple parallel small surface cracks in the localized fretting slip region were nucleated. Constant load tests at various initial stress intensity factors (K i ) were then carried out in 288°C, 7.3MPa pure water, which is the operating condition for BWR, to investigate failure behavior of this material under constant load condition. From the results, it was speculated that the K ISCC for small surface crack was lower than 4.7MPa⋅m 1/2 , which was significantly low compared to that of long crack (10-20 MPa⋅m 1/2 ).

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Section: Constant Load Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Failure Behavior of Sensitized SUS304 Stainless Steel with Small Surface Pre-Crack under Constant Load Condition in Simulated BWR Environment

Saengsai

Otsuka

Mutoh

2011

JMMP

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“…The SCC crack initiation process of ultra-high strength stainless steel is controlled by pitting, while the crack propagation stage is mainly controlled by anodic dissolution (AD) and hydrogen embrittlement (HE) mechanisms [23,24]. Among them, the AD mechanism contains the slip dissolution mechanism [25], the oxide film cracking mechanism [26], and the selective dissolution mechanism [27]. The HE mechanisms include hydrogen-enhanced decohesion (HEDE) [28], hydrogen-enhanced localized plasticity (HELP) [29], and adsorption-induced dislocation emission (AIDE) [30].…”

Section: Introductionmentioning

confidence: 99%

Effect of Organizational Evolution on the Stress Corrosion Cracking of the Cr-Co-Ni-Mo Series of Ultra-High Strength Stainless Steel

Tian

Liu

et al. 2022

Materials

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Different microstructures were obtained under various thermal conditions by adjusting the heat treatment parameters of the Cr-Co-Ni-Mo series of ultra-high strength stainless steel. The effect of organizational evolution on the stress corrosion cracking (SCC) of the Cr-Co-Ni-Mo series of ultra-high strength stainless steel was investigated using potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and other test methods in combination with slow strain rate tensile tests (SSRTs). The results show that the Mo- and Cr-rich clusters and precipitation of the Laves phase reduce the corrosion resistance, while increasing the austenite content can improve the corrosion resistance. The Cr-Co-Ni-Mo series of ultra-high strength stainless steel has a high SCC resistance after quenching at 1080 °C and undergoing deep cooling (DC) treatment at −73 °C. With increasing holding time, the strength of the underaged and peak-aged specimens increases, but the passivation and SCC resistance decreases. At the overaged temperature, the specimen has good SCC resistance after a short holding time, which is attributed to its higher austenite content and lower dislocation density. As a stable hydrogen trap in steel, austenite effectively improves the SCC resistance of steel. However, under the coupled action of hydrogen and stress, martensitic transformation occurs due to the decrease in the lamination energy of austenite, and the weak martensitic interface becomes the preferred location for crack initiation and propagation.

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“…In SCC, there are many factors affecting the crack initiation and propagation. Some researchers focused on the CPFs [1][2][3][4] and CPF-induced stress [5][6][7][8][9]. Nelson and Oriani [1] indicated that metal foils with a protective layer forming on one side were concave or convex during anodic polarization using a potentiostat to experimentally prove a tensile or compressive stress generated at or near the CPF interface.…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis of stress corrosion cracking for copper in an ammoniacal solution

et al. 2015

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Finite element analyses including a cohesive zone model (CZM) were conducted to investigate the role of corrosion product films (CPFs) in stress corrosion cracking (SCC) for copper in an ammoniacal solution. It is found that a tensile CPF-induced stress generates near the interface between the CPF and the copper substrate at the substrate side in front of the notch tip for a U-shaped edgenotched specimens. The CPF-induced stress is superimposed on the applied stress to enhance emission and motion of dislocations. The peak opening stress (S 11 ) increases with an increase in CPF thickness and a decrease in CPF Young's modulus. Damage mechanics based on the CZM was applied to study the stress corrosion crack initiation and propagation by analyzing the stress redistributions and load-displacement curves. The results show that the crack initiates first in the CPF and then propagates to the copper substrate. The fracture strain of the specimen covered a CPF is lower than that without a CPF. Based on the simulation results, the mechanism of the CPF-induced SCC, which promoted the initiation and propagation of the stress corrosion cracks, was discussed.

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An ATEM study of oxidation behavior of SCC crack tips in 304L stainless steel in high temperature oxygenated water

Cited by 57 publications

References 30 publications

Failure Behavior of Sensitized SUS304 Stainless Steel with Small Surface Pre-Crack under Constant Load Condition in Simulated BWR Environment

Failure Behavior of Sensitized SUS304 Stainless Steel with Small Surface Pre-Crack under Constant Load Condition in Simulated BWR Environment

Effect of Organizational Evolution on the Stress Corrosion Cracking of the Cr-Co-Ni-Mo Series of Ultra-High Strength Stainless Steel

Finite element analysis of stress corrosion cracking for copper in an ammoniacal solution

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