... on crack initiation was more significant than that on crack propagation. For X100 steel, it was observed that hydrogen evolution and absorption played an important role in crack initiation, while anodic dissolution of steel dominated the crack propagation process. The increase of CP level could cause more...

... stability based on linear elastic fracture mechanics. The criteria can be used to infer the material toughness and the toughness gradient at a propagating crack tip. These have implications on the mechanisms and kinetics of crack propagation. Of particular interest is the role that crack geometry may play...

... and phosphate ions, which stimulate the AD process, accelerate crack propagation in weakly-acidic solutions. Thiourea stimulates the AD process in buffered NS4 solution and accelerates the crack growth in this solution. The effects of HA promoters may vary. Their influence on the crack propagation could...

... 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...

... variable amplitude loading crack propagation focused ion beam microscopy INTRODUCTION Stress corrosion cracking (SCC) was first observed on natural gas pipelines in the early 1960’s and since then has been found on pipelines in many countries including Canada ^{( 1 )}. Two types of pipeline SCC...

... and by increasing the frequency of damaging operating pressure cycles. pipeline corrosion fatigue crack initiation crack propagation crack growth mechanical driving forces environmental driving forces stress intensifier longseam weld corrosion pit elastic plastic FEA near neutral pH SCC INTRODUCTION...

..., as for instance offshore platforms and pipelines. In order to support conclusive testing and life time evaluation of welded steel components, a numerical model for hydrogen assisted cracking has been developed, particularly taking into consideration the geometrical effects of crack propagation on the respective...

... been responsible for the formation of microgalvanic cells that lead to the selective dissolution of the ferrite phase in favor of the austenitic matrix. This situation provided suitable nucleation sites for cracking, and its simultaneous occurrence promoted crack propagation. Optical and electron...

... with a microstructure that is a mixed of tempered lath martensite and a phase composed of ferrite and carbides; this material presented also a fine dispersion of (CN)Nb. Sulfide Stress Cracking HSLA Steel Crack Propagation Double Cantilever Beam NACE TM 0177-96 Microstructure INTRODUCTION Sulfide Stress Cracking...

... test NACE TM0177-90 specimen thickness steel ultrasonic techniques crack propagation INTRODUCTION The presence of H₂S in well fluids, that could lead to Sulfide Stress Cracking (SSC) of Oil Country Tubular Goods (OCTG), exerts restrictions on the selection of the materials for OCTG...

... environment followed by loading in the low-pH environment. Stress Corrosion Cracking Pipelines Crack Propagation Low-pH Environment Fracture Mechanics J Integral Mechanical Effects Metallurgy BACKGROUND The first incident of external stress corrosion cracking (SCC) on natural gas pipelines occurred...

...noble metal chemical addition electrochemical corrosion potential crack initiation crack propagation boiling water reactor nuclear materials INTRODUCTION The concept of achieving lower ECPs at relatively low hydrogen levels by having a thin platinum coating electrolessly deposited on 316 SS...

... to crack propagation, and considerably less attention has been given to understanding the initiation process. Establishing the initiation mechanism and understanding the stress/environment interaction occurring during this process may be crucial to resolving the propagation mechanism...

... observed in the testing and the J-integral appears to be a good parameter for characterizing crack growth behavior. Stress Corrosion Cracking Pipelines Crack Propagation Low-pH Environment Fracture Mechanics J-Integral BACKGROUND The first incident of external stress corrosion cracking (SCC...