... management for existing pressurized water reactors. To address this issue, long-term SCC initiation testing has been conducted on both cold-worked (CW) Alloy 600 and Alloy 690 in 360°C simulated PWR primary water with crack initiation determined in-situ by direct current potential drop. SCC initiation...

... heat describing crack initiation microstructures and the effect of test temperature on SCC initiation time. EXPERIMENTAL PROCEDURE Material The bulk composition of the Alloy 600 plate material is listed in Table 1 . This material was solution annealed at 1100°C for 30 min followed by a water quench...

... of CP on the occurrence of SCC in X80 and X100 steels was different. For X80 steel, CP exhibited an inhibiting effect on both SCC crack initiation and propagation by controlling the anodic dissolution process of steel and the inhibiting effect increased with CP level. The mitigating effect of CP...

...Abstract Stress corrosion crack initiation of two thermally-treated, cold-worked (CW) UNS N06690 (alloy 690) materials was investigated in 360 ^°C simulated PWR primary water using constant load tensile (CLT) tests and blunt notch compact tension (BNCT) tests equipped with direct current...

... function as a result of crack initiation and propagation through the canister wall thickness. In this assessment, key factors affecting CISCC of the canisters are identified in terms of environments, stresses, and material sensitization. This paper proposed a methodology to estimate the time for crack...

... from the grain boundaries. alloy 690 grain boundaries corrosion oxidation stress corrosion cracking crack initiation INTRODUCTION Table 1 Description of Alloy 690 Material Heat B25K Material Condition Composition, wt% Microstructure ATI Allvac 3.25” Billet Heat B25K Mill Anneal...

... of hardness varied over applicable ranges. sulfide stress cracking SSC DCB pipe performance probability crack initiation crack propagation K_ISSC risk hardness scatter Nace TM0177 Method-A Method-D CRACK INITIATION AND CRACK PROPAGATION MODES OF FAILURE Following Reference ( 1 ), we...

... the disbonded coating of pipeline steel can vary significantly from near-neutral to high pH values. The pH value was strongly affected by CO₂ availability and the level of cathodic protection. When cyclic loading was applied in the stress corrosion cracking initiation tests, based on the local...

... uncertainty and ensure future integrity of the pipeline. ERW seam failure failure analysis crack initiation subcritical crack growth fatigue cleavage FAD analysis life estimate INTRODUCTION Recently, Williams Gas Pipeline experienced an incident occurred at about 1.5 miles down stream...

.... SCC crack assessment failure assessment diagram FAD elastic-plastic fracture mechanics crack initiation ductile tearing tearing instability leak rupture API 579 BS7910 INTRODUCTION There has been an increasing concern within the pipeline industry about the detection and assessment...

...In crack initiation studies, Parkins ⁸ found that the majority of cracks generated in cyclic loading tests ceased growing after reaching a depth of about ~20 μm, which roughly corresponds to the maximum pearlite spacing bands. Wang ¹⁹ observed similar sized cracks ranging...

... surface, may all have an effect on crack initiation and propagation. stress corrosion cracking pipeline steels X-52 crack initiation focus ion beam hydrogen INTRODUCTION TABLE 1 CHEMICAL COMPOSITION (WILLIAMS GAS’ 16” X-52 STEEL) C Mn P S Si min max min max min max min max min...

... stainless steel was evaluated to provide benchmark data. Stress corrosion cracking crack initiation constant load alloy 22 titanium alloys stainless steel concentrated groundwater welding shot peening INTRODUCTION General corrosion, localized corrosion (pitting and crevice corrosion) and stress...

...Abstract In the present study alloys 600 and 690 were tested in simulated PWR primary water, at 360°C, under electrochemical conditions corresponding to Ni/NiO equilibrium potential which corresponds to the maximum sensitivity of alloy 600 to crack initiation. The potential was adjusted through...

...EXPERIMENTAL RESULTS AND DISCUSSION Experimental results are summarized in Table 3 . Some tests were performed to investigate the effects of exposure time and potential (Test M1-M6), applied stress (Test P1-P4) and stress ratio and potential (Test F1-F6) on crack initiation. From the results...

... (DFA). Once a crack initiates, the Coupled Environment Fracture Model (CEFM) and the Coupled Environment Corrosion Fatigue Model (CECFM) for stress corrosion cracking and corrosion fatigue, respectively, describe continued, stress-augmented propagation. The principals of DFA are illustrated...

... that is engendered by a dilute, lower pH solution. Consideration is given as to how the higher pH solution derives from the lower pH version and the influence of the different environments on the mechanisms of crack initiation and growth. The ingress of hydrogen to the steel is involved with the lower pH solution...

...Abstract Predicting the life and reliability of boiling water nuclear reactor (BWR) structural components subject to stress corrosion cracking requires high quality data and data analysis for both crack initiation and crack propagation. Laboratory study and prediction of crack propagation rates...

... initiation. The higher flow velocity presumably eliminates the accumulation of impurities and localized chemistry conditions on the specimen surface that are responsible for promoting crack initiation. Thus, even if a crack nucleus is formed, on a microscopic scale the chemistry conditions conducive to grow...

... and crack initiation and growth are greatly reduced, even at high O₂ or H₂O₂ levels. Without excess H₂ (i.e., in normal BWR water chemistry), noble metals do not increase the corrosion potential or SCC. The success...