The objective of this investigation was to understand the role of crack dimension, hydrogen, room-temperature creep and loading procedure on crack growth during hydrostatic testing of pipeline steels in near-neutral pH aqueous soil environments. Crack growth was found during hydrotesting, but was not linearly related to the stress intensity factor at the crack tip. Crack growth is mainly driven through the internal-hydrogen-assisted-cracking mechanism, instead of the hydrogen-environmental-assisted-cracking mechanism. Excessive plastic deformation induced by room-temperature creep prior to hydrotesting reduces crack advance during hydrotesting. Lower loading rate generally induces larger crack growth by hydrostatic loading. More crack growth occurs during loading in high stress regime.
Simulation of crack growth during hydrostatic testing of pipeline steel in near-neutral pH environment
Simulation des Risswachstums während der hydrostatischen Prüfung von Rohrstahl in nahezu neutralen Medien
Corrosion Science ; 53 , 3 ; 968-975
2011
8 Seiten, 12 Bilder, 1 Tabelle, 26 Quellen
Aufsatz (Zeitschrift)
Englisch
Rohrstahl , Pipeline , Wasserstoffversprödung , Spannungskorrosion , hydrostatische Belastung , Risseinleitung , Rissgeschwindigkeit , Rissausbreitung , Mikrostruktur , Zugprüfung , Kerbprüfkörper , Korrosionspotenzial , Fraktographie , Spannungsintensitätsfaktor , Rissspitze , plastische Verformung , neutrales Medium
Crack growth model for pipeline steels exposed to near-neutral pH groundwater
Tema Archiv | 2013
|Near-neutral pH SCC initiation and early propagation of X70 pipeline steel
Tema Archiv | 2002
|