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Resistance bonding of dissimilar alloys using a powder interlayer: A feasibility study. / Cameron Pleydell-Pearce

Swansea University Author: Cameron Pleydell-Pearce

Abstract

An experimental framework has been developed that allows investigation of a novel resistance bonding technique incorporating a metal powder interlayer as a means of forming sound joints between dissimilar alloys. Bonds have been produced between Ti- 6AI-4V, Inconel 718 and super CMV steel. Ti-6-4, B...

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Published: 2008
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42467
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last_indexed 2018-08-03T10:10:14Z
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spelling 2018-08-02T16:24:29.3533874 v2 42467 2018-08-02 Resistance bonding of dissimilar alloys using a powder interlayer: A feasibility study. 8903282940a59caee0bd2dca890771b5 NULL Cameron Pleydell-Pearce Cameron Pleydell-Pearce true true 2018-08-02 An experimental framework has been developed that allows investigation of a novel resistance bonding technique incorporating a metal powder interlayer as a means of forming sound joints between dissimilar alloys. Bonds have been produced between Ti- 6AI-4V, Inconel 718 and super CMV steel. Ti-6-4, BurTi and Inconel 718 powder interlayer layers have been trialed. The use of diffusion barrier coatings and transition layers have been explored with particular interest focussed on the effect of tantalum. These trials were then compared to analysis of corresponding bond chemistries produced by a conventional hot isostatic pressing technique. It was found that joints between Ti-6AI-4V and Inconel 718 and super CMV were prone to the formation of intermetallic films at the interface (NiTi, Ti2Ni, Fe2Ti), resulting in poor bond quality. Whilst the use of diffusion barrier layers reduced reaction zone size, tantalum layers in particular were found to severely degrade joint integrity. Bonds produced between Inconel 718 and super CMV performed more encouragingly; achieving around 70% of Inconel 718 parent metal properties in the optimum condition. Comparisons between conventional HIP procedures and resistance bonding elucidated far better powder consolidation in the former. This was shown to be due to a 'differential heating' effect under resistance heating. A quasi isostatic powder interlayer bonding technique (QUIP) has been developed that has shown to substantially improve joint integrity. This is under continuing development. E-Thesis Materials science. 31 12 2008 2008-12-31 COLLEGE NANME Engineering COLLEGE CODE Swansea University Doctoral Ph.D 2018-08-02T16:24:29.3533874 2018-08-02T16:24:29.3533874 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Cameron Pleydell-Pearce NULL 1 0042467-02082018162456.pdf 10798175.pdf 2018-08-02T16:24:56.7930000 Output 34026792 application/pdf E-Thesis true 2018-08-02T16:24:56.7930000 false
title Resistance bonding of dissimilar alloys using a powder interlayer: A feasibility study.
spellingShingle Resistance bonding of dissimilar alloys using a powder interlayer: A feasibility study.
Cameron Pleydell-Pearce
title_short Resistance bonding of dissimilar alloys using a powder interlayer: A feasibility study.
title_full Resistance bonding of dissimilar alloys using a powder interlayer: A feasibility study.
title_fullStr Resistance bonding of dissimilar alloys using a powder interlayer: A feasibility study.
title_full_unstemmed Resistance bonding of dissimilar alloys using a powder interlayer: A feasibility study.
title_sort Resistance bonding of dissimilar alloys using a powder interlayer: A feasibility study.
author_id_str_mv 8903282940a59caee0bd2dca890771b5
author_id_fullname_str_mv 8903282940a59caee0bd2dca890771b5_***_Cameron Pleydell-Pearce
author Cameron Pleydell-Pearce
author2 Cameron Pleydell-Pearce
format E-Thesis
publishDate 2008
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 An experimental framework has been developed that allows investigation of a novel resistance bonding technique incorporating a metal powder interlayer as a means of forming sound joints between dissimilar alloys. Bonds have been produced between Ti- 6AI-4V, Inconel 718 and super CMV steel. Ti-6-4, BurTi and Inconel 718 powder interlayer layers have been trialed. The use of diffusion barrier coatings and transition layers have been explored with particular interest focussed on the effect of tantalum. These trials were then compared to analysis of corresponding bond chemistries produced by a conventional hot isostatic pressing technique. It was found that joints between Ti-6AI-4V and Inconel 718 and super CMV were prone to the formation of intermetallic films at the interface (NiTi, Ti2Ni, Fe2Ti), resulting in poor bond quality. Whilst the use of diffusion barrier layers reduced reaction zone size, tantalum layers in particular were found to severely degrade joint integrity. Bonds produced between Inconel 718 and super CMV performed more encouragingly; achieving around 70% of Inconel 718 parent metal properties in the optimum condition. Comparisons between conventional HIP procedures and resistance bonding elucidated far better powder consolidation in the former. This was shown to be due to a 'differential heating' effect under resistance heating. A quasi isostatic powder interlayer bonding technique (QUIP) has been developed that has shown to substantially improve joint integrity. This is under continuing development.
published_date 2008-12-31T03:53:01Z
_version_ 1763752627842056192
score 11.037319

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