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A study of passivity and stress corrosion cracking (SCC) of alloy 800 in simulated steam generator crevice solution containing thiosulfate and sulphide species
DownloadFall 2011
The passivity and stress corrosion cracking (SCC) behavior of Alloy 800 was studied in test solution containing thiosulfate and sulphide species. Cyclic polarization experiments in thiosulfate containing solutions indicated that with an increase in the concentration of thiosulfate, both the...
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Spring 2010
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...
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Effect of unloading rate on surface crack growth during underload cycles in X-65 pipeline steel exposed to near-neutral pH environments
DownloadSpring 2019
This thesis has studied the crack growth behaviour of fully-coated, partially-coated, and fully-exposed semi-elliptical cracks immersed in a near-neutral pH environment with an applied cathodic potential. The effects of adding a one-hour monotonic hold and waveform shape were explored. The...
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Full-Scale Investigation of Crack Growth Behaviour Under Variable Pressure Fluctuations in Near-Neutral pH Environments
DownloadSpring 2020
The goal of this investigation was to study hydrogen-facilitated fatigue crack growth behaviour on pre-existing cracks in a full-scale specimen exposed to a near-neutral pH (NNpH) environment. The full-scale specimen used in this study was a 4.77 m segment of NPS 18, SCH 10, X-60 gas transmission...
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Investigation of Surface Crack Growth Behaviour Under Variable Pressure Fluctuations in Near-Neutral pH Environments
DownloadFall 2017
The goal of this investigation was to study the corrosion fatigue behaviour and mechanisms of surface cracks, semi-elliptical in shape, when exposed to near-neutral pH environments conducive to the environments experienced in the field. To better simulate field conditions, while avoiding the...
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Sequencing & Agglomeration of Cycles in Variable Amplitude Underload Spectra: Effects on Surface Crack Growth in a Near-neutral pH Environment
DownloadFall 2018
Stress corrosion cracking (SCC) is one of the biggest integrity threat facing pipelines. Large numbers of SCC defects are detected every year, but scheduling the repair work for these defects is an enormous challenge. Pipeline companies have limited resources to take on the repairs. Therefore the...