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Crack growth behavior of pipeline steels in near-neutral pH environment Open Access


Other title
SCC, Corrosion Fatigue, Pipeline Steels, Hydrogen Embrittlement, Near-Neutral pH Environment
Type of item
Degree grantor
University of Alberta
Author or creator
Marvasti, Mohammad Hassan
Supervisor and department
Dr. Weixing Chen, Department of Chemical and Materials Engineering
Examining committee member and department
Dr. Zihui Xia, Department of Mechanical Engineering
Dr. Hao Zhang, Department of Chemical and Materials Engineering
Dr. Reg Eadie, Department of Chemical and Materials Engineering
Department of Chemical and Materials Engineering

Date accepted
Graduation date
Master of Science
Degree level
Stress corrosion cracking (SCC) from the external surface of a buried pipeline is a serious matter and can cause significant economic and environmental losses. Despite of many research works which have been done on the understanding of crack initiation and propagation mechanisms, these mechanisms are still being debated. This research studied the crack growth behaviour of different pipeline steels including two types of X65, one X52 and one X80 pipeline steels in near-neutral pH environments. Crack growth behaviour of all steels has been found to be consistent with that of true corrosion fatigue. Crack growth rates were correlated with (K)2Kmax/f0.1. It was revealed that cracking behaviour of pipeline steels in near neutral pH environments is material dependent. Highest crack growth rate was seen in the steel which highest amount of hydrogen atoms could be generated and stored in its microstructure to contribute in cracking procedure due to hydrogen embrittlement effect.
License granted by Mohammad Hassan Marvasti ( on 2010-04-09T23:05:11Z (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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