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The combination of processes influencing fracture in ferritic steels. / Owen Williams

Swansea University Author: Owen Williams

Abstract

In order to understand the brittle fracture of ferritic steels, it is necessary to understand all of the processes that have an influence on the brittle fracture. Much work has been done previously on grain boundary geometry and structure, grain boundary segregation, the effects of heat treatments a...

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Published: 2003
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42421
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first_indexed 2018-08-02T18:54:40Z
last_indexed 2018-08-03T10:10:06Z
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spelling 2018-08-02T16:24:29.1973906 v2 42421 2018-08-02 The combination of processes influencing fracture in ferritic steels. 9c8061eb8f6e2984fd1ef127702e409c NULL Owen Williams Owen Williams true true 2018-08-02 In order to understand the brittle fracture of ferritic steels, it is necessary to understand all of the processes that have an influence on the brittle fracture. Much work has been done previously on grain boundary geometry and structure, grain boundary segregation, the effects of heat treatments and the fracture process, but little work has been reported on the combined result of these processes and the effects that they have on each other and the process of brittle fracture in ferritic steels. The aim of this project was to investigate the combined influence that the processes of grain boundary structure, segregation, and heat treatment have on the brittle fracture of ferritic steel. All experiments were carried out on a Fe-0.06wt%P-0.002wt%C and a Fe-0.12wt%P-0.002wt%C alloy, which was subject to a set of specific heat treatments. Investigations were made into the grain boundary structure of the material using Electron Back-Scatter Diffraction (EBSD) and the segregation studied by Auger Electron Microscopy (AES). A number of innovative analysis techniques were developed during the course of the program in order to determine the combined effects of boundary structure and segregation on the fracture process of the material. Two separate grain growth mechanisms were found to be operating in this material at different temperature ranges. Abnormal grain growth being prolific in this material at annealing temperatures above 900&deg;C, normal grain growth being the dominant grain growth mechanism for annealing temperatures of below 900&deg;C. Both abnormal grain growth and Sigma3 proportions were found to be dependent on the annealing temperature and both were affected by a transition that occurs at 0.65-0.75 of the melting temperature, given by (Tp) It was also found that 3at% more segregated phosphorus was present on {lcub}112{rcub} boundary planes than on {lcub}110{rcub} boundary planes on the fracture surfaces of the material. E-Thesis Materials science. 31 12 2003 2003-12-31 COLLEGE NANME Engineering COLLEGE CODE Swansea University Doctoral Ph.D 2018-08-02T16:24:29.1973906 2018-08-02T16:24:29.1973906 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Owen Williams NULL 1 0042421-02082018162453.pdf 10798129.pdf 2018-08-02T16:24:53.0800000 Output 9193258 application/pdf E-Thesis true 2018-08-02T16:24:53.0800000 false
title The combination of processes influencing fracture in ferritic steels.
spellingShingle The combination of processes influencing fracture in ferritic steels.
Owen Williams
title_short The combination of processes influencing fracture in ferritic steels.
title_full The combination of processes influencing fracture in ferritic steels.
title_fullStr The combination of processes influencing fracture in ferritic steels.
title_full_unstemmed The combination of processes influencing fracture in ferritic steels.
title_sort The combination of processes influencing fracture in ferritic steels.
author_id_str_mv 9c8061eb8f6e2984fd1ef127702e409c
author_id_fullname_str_mv 9c8061eb8f6e2984fd1ef127702e409c_***_Owen Williams
author Owen Williams
author2 Owen Williams
format E-Thesis
publishDate 2003
institution Swansea University
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 In order to understand the brittle fracture of ferritic steels, it is necessary to understand all of the processes that have an influence on the brittle fracture. Much work has been done previously on grain boundary geometry and structure, grain boundary segregation, the effects of heat treatments and the fracture process, but little work has been reported on the combined result of these processes and the effects that they have on each other and the process of brittle fracture in ferritic steels. The aim of this project was to investigate the combined influence that the processes of grain boundary structure, segregation, and heat treatment have on the brittle fracture of ferritic steel. All experiments were carried out on a Fe-0.06wt%P-0.002wt%C and a Fe-0.12wt%P-0.002wt%C alloy, which was subject to a set of specific heat treatments. Investigations were made into the grain boundary structure of the material using Electron Back-Scatter Diffraction (EBSD) and the segregation studied by Auger Electron Microscopy (AES). A number of innovative analysis techniques were developed during the course of the program in order to determine the combined effects of boundary structure and segregation on the fracture process of the material. Two separate grain growth mechanisms were found to be operating in this material at different temperature ranges. Abnormal grain growth being prolific in this material at annealing temperatures above 900&deg;C, normal grain growth being the dominant grain growth mechanism for annealing temperatures of below 900&deg;C. Both abnormal grain growth and Sigma3 proportions were found to be dependent on the annealing temperature and both were affected by a transition that occurs at 0.65-0.75 of the melting temperature, given by (Tp) It was also found that 3at% more segregated phosphorus was present on {lcub}112{rcub} boundary planes than on {lcub}110{rcub} boundary planes on the fracture surfaces of the material.
published_date 2003-12-31T03:52:56Z
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score 11.035874

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