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Combined creep and hydrogen attack of petro refinery steel / ANDREW BAKER

Swansea University Author: ANDREW BAKER

DOI (Published version): 10.23889/SUthesis.59004

Abstract

The thesis is based on the study of the interaction between creep and hydrogen attack, with particular emphasis on the commonly used 2.25Cr-lMo steel. The driving force for the work is the petrochemical industry, where large steel reactor vessels used for hydro-cracking and other processes, are know...

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Published: Swansea 2021
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa59004
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first_indexed 2021-12-14T11:48:45Z
last_indexed 2021-12-15T04:28:58Z
id cronfa59004
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spelling 2021-12-14T11:54:49.6747503 v2 59004 2021-12-14 Combined creep and hydrogen attack of petro refinery steel a0ab2cc6ea0d322645875d8a5dea7f3e ANDREW BAKER ANDREW BAKER true false 2021-12-14 The thesis is based on the study of the interaction between creep and hydrogen attack, with particular emphasis on the commonly used 2.25Cr-lMo steel. The driving force for the work is the petrochemical industry, where large steel reactor vessels used for hydro-cracking and other processes, are known to suffer damage by hydrogen attack. Currently, no reliable method exists for determining the lifetime of these vessels, due partially to the difficulty of obtaining experimental data under the necessary' high hydrogen pressures and temperatures.A large part of the thesis involved the design and building of unique, high-tech testing facilities which could operate safely and accurately under the severe conditions required for such a study. The test rigs were then used to perform both simple uniaxial creep and internally pressurised tube tests in hydrogen environments. Pressurised tubes were used to provide a stress-state more closely related to that found in industrial components. Such experiments allow more accurate extrapolation to industrial pressure vessel behaviour than would be possible with uniaxial data alone.The creep results, together with careful metallography, showed the damaging effect of hydrogen attack on creep life and ductility, or conversely, the accelerating effect of applied stress on hydrogen attack. Tube testing revealed an effect of the multiaxial stress and demonstrated the importance of the hydrogen concentration in the steel.The above results were used to develop a Continuum Damage Mechanics (CDM) model for the prediction of tubular behaviour when pressurised with hydrogen. Within the range of conditions studied, the model was successful and further creep testing work is suggested to verify and develop the model further, as well as to study in greater detail the hydrogen attack mechanisms. E-Thesis Swansea 14 12 2021 2021-12-14 10.23889/SUthesis.59004 COLLEGE NANME COLLEGE CODE Swansea University Doctoral Ph.D 2021-12-14T11:54:49.6747503 2021-12-14T11:45:40.4086229 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised ANDREW BAKER 1 59004__21879__5bc01603c4224e36bb5ea6493fcaae7c.pdf 636011.pdf 2021-12-14T11:49:17.9536466 Output 14503392 application/pdf E-Thesis – open access true true eng
title Combined creep and hydrogen attack of petro refinery steel
spellingShingle Combined creep and hydrogen attack of petro refinery steel
ANDREW BAKER
title_short Combined creep and hydrogen attack of petro refinery steel
title_full Combined creep and hydrogen attack of petro refinery steel
title_fullStr Combined creep and hydrogen attack of petro refinery steel
title_full_unstemmed Combined creep and hydrogen attack of petro refinery steel
title_sort Combined creep and hydrogen attack of petro refinery steel
author_id_str_mv a0ab2cc6ea0d322645875d8a5dea7f3e
author_id_fullname_str_mv a0ab2cc6ea0d322645875d8a5dea7f3e_***_ANDREW BAKER
author ANDREW BAKER
author2 ANDREW BAKER
format E-Thesis
publishDate 2021
institution Swansea University
doi_str_mv 10.23889/SUthesis.59004
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description The thesis is based on the study of the interaction between creep and hydrogen attack, with particular emphasis on the commonly used 2.25Cr-lMo steel. The driving force for the work is the petrochemical industry, where large steel reactor vessels used for hydro-cracking and other processes, are known to suffer damage by hydrogen attack. Currently, no reliable method exists for determining the lifetime of these vessels, due partially to the difficulty of obtaining experimental data under the necessary' high hydrogen pressures and temperatures.A large part of the thesis involved the design and building of unique, high-tech testing facilities which could operate safely and accurately under the severe conditions required for such a study. The test rigs were then used to perform both simple uniaxial creep and internally pressurised tube tests in hydrogen environments. Pressurised tubes were used to provide a stress-state more closely related to that found in industrial components. Such experiments allow more accurate extrapolation to industrial pressure vessel behaviour than would be possible with uniaxial data alone.The creep results, together with careful metallography, showed the damaging effect of hydrogen attack on creep life and ductility, or conversely, the accelerating effect of applied stress on hydrogen attack. Tube testing revealed an effect of the multiaxial stress and demonstrated the importance of the hydrogen concentration in the steel.The above results were used to develop a Continuum Damage Mechanics (CDM) model for the prediction of tubular behaviour when pressurised with hydrogen. Within the range of conditions studied, the model was successful and further creep testing work is suggested to verify and develop the model further, as well as to study in greater detail the hydrogen attack mechanisms.
published_date 2021-12-14T04:15:58Z
_version_ 1763754071789928448
score 11.028908

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