Investigating the mechanism of transgranular stress corrosion cracking in near-neutral ph environments on buried fuel transmission pipelines
This research investigates the mechanism of transgranular stress corrosion cracking (TGSCC) on fuel transmission pipelines. This research proposes that in near-neutral pH environments, hydrogen can be generated by the dissociation of carbonic acid and the reaction of metal ions with bicarbonate solu...
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Georgia Institute of Technology
2007
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ftgeorgiatech:oai:smartech.gatech.edu:1853/26499 2023-05-15T15:52:51+02:00 Investigating the mechanism of transgranular stress corrosion cracking in near-neutral ph environments on buried fuel transmission pipelines Asher, Stefanie Lynn Singh, Preet M. Materials Science and Engineering Gokhale, Arun M. Marek, Miroslav I. Thadhani, Naresh N. Richard Neu Sanders, Thomas H., Jr. 2007-11-12 application/pdf http://hdl.handle.net/1853/26499 unknown Georgia Institute of Technology http://hdl.handle.net/1853/26499 Pipelines Carbon dioxide Stress corrosion cracking Transgranular Stress corrosion Underground pipelines Text Dissertation 2007 ftgeorgiatech 2023-01-30T18:44:47Z This research investigates the mechanism of transgranular stress corrosion cracking (TGSCC) on fuel transmission pipelines. This research proposes that in near-neutral pH environments, hydrogen can be generated by the dissociation of carbonic acid and the reaction of metal ions with bicarbonate solutions, significantly increasing the available hydrogen for diffusion into the pipeline steel. This research has shown that TGSCC of pipeline steels is possible in simple groundwater solutions containing bicarbonate ions and carbon dioxide. Microstructural characterization coupled with hydrogen permeation indicates that the level of strain in the microstructure has the most influence on hydrogen diffusivity. Hydrogen accumulation occurs preferentially in at high energy discontinuous interfaces such as inclusion interfaces. It was determined that a stress concentration is required to facilitate sufficient hydrogen accumulation in the pipeline steel in order to initiate TGSCC. It was discovered that these stress concentrations develop from inclusions falling out of the pipeline surface. Slow strain rate tests found that TGSCC occurred in a wide range of compositions and temperatures as long as near-neutral conditions were maintained. Microcracks ahead of the crack tip provide evidence of hydrogen in these cracking processes. Morphology of these microcracks indicates that cracks propagate by the coalescence of microcracks with the main crack tip. Further research findings, scientific impact, and potential future work are also discussed. Ph.D. Doctoral or Postdoctoral Thesis Carbonic acid Georgia Institute of Technology: SMARTech - Scholarly Materials and Research at Georgia Tech |
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Georgia Institute of Technology: SMARTech - Scholarly Materials and Research at Georgia Tech |
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Pipelines Carbon dioxide Stress corrosion cracking Transgranular Stress corrosion Underground pipelines |
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Pipelines Carbon dioxide Stress corrosion cracking Transgranular Stress corrosion Underground pipelines Asher, Stefanie Lynn Investigating the mechanism of transgranular stress corrosion cracking in near-neutral ph environments on buried fuel transmission pipelines |
topic_facet |
Pipelines Carbon dioxide Stress corrosion cracking Transgranular Stress corrosion Underground pipelines |
description |
This research investigates the mechanism of transgranular stress corrosion cracking (TGSCC) on fuel transmission pipelines. This research proposes that in near-neutral pH environments, hydrogen can be generated by the dissociation of carbonic acid and the reaction of metal ions with bicarbonate solutions, significantly increasing the available hydrogen for diffusion into the pipeline steel. This research has shown that TGSCC of pipeline steels is possible in simple groundwater solutions containing bicarbonate ions and carbon dioxide. Microstructural characterization coupled with hydrogen permeation indicates that the level of strain in the microstructure has the most influence on hydrogen diffusivity. Hydrogen accumulation occurs preferentially in at high energy discontinuous interfaces such as inclusion interfaces. It was determined that a stress concentration is required to facilitate sufficient hydrogen accumulation in the pipeline steel in order to initiate TGSCC. It was discovered that these stress concentrations develop from inclusions falling out of the pipeline surface. Slow strain rate tests found that TGSCC occurred in a wide range of compositions and temperatures as long as near-neutral conditions were maintained. Microcracks ahead of the crack tip provide evidence of hydrogen in these cracking processes. Morphology of these microcracks indicates that cracks propagate by the coalescence of microcracks with the main crack tip. Further research findings, scientific impact, and potential future work are also discussed. Ph.D. |
author2 |
Singh, Preet M. Materials Science and Engineering Gokhale, Arun M. Marek, Miroslav I. Thadhani, Naresh N. Richard Neu Sanders, Thomas H., Jr. |
format |
Doctoral or Postdoctoral Thesis |
author |
Asher, Stefanie Lynn |
author_facet |
Asher, Stefanie Lynn |
author_sort |
Asher, Stefanie Lynn |
title |
Investigating the mechanism of transgranular stress corrosion cracking in near-neutral ph environments on buried fuel transmission pipelines |
title_short |
Investigating the mechanism of transgranular stress corrosion cracking in near-neutral ph environments on buried fuel transmission pipelines |
title_full |
Investigating the mechanism of transgranular stress corrosion cracking in near-neutral ph environments on buried fuel transmission pipelines |
title_fullStr |
Investigating the mechanism of transgranular stress corrosion cracking in near-neutral ph environments on buried fuel transmission pipelines |
title_full_unstemmed |
Investigating the mechanism of transgranular stress corrosion cracking in near-neutral ph environments on buried fuel transmission pipelines |
title_sort |
investigating the mechanism of transgranular stress corrosion cracking in near-neutral ph environments on buried fuel transmission pipelines |
publisher |
Georgia Institute of Technology |
publishDate |
2007 |
url |
http://hdl.handle.net/1853/26499 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_relation |
http://hdl.handle.net/1853/26499 |
_version_ |
1766387956899119104 |