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Advanced characterisation of microstructural evolution and liquation mechanisms in RR1000 employing a novel semi-solid testing facility / SEAN JOHN

Swansea University Author: SEAN JOHN

  • Redacted version - open access under embargo until: 9th February 2026

DOI (Published version): 10.23889/SUthesis.59111

Abstract

Inertia friction welding is a joining technique that is used in many industries as it can create high quality welds with narrow heat affected zones. The nickel superalloy RR1000 is routinely joined via inertia friction welding, during the manufacture of compressor components for gas turbine engines,...

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Published: Swansea 2022
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: Davies, Helen
URI: https://cronfa.swan.ac.uk/Record/cronfa59111
first_indexed 2022-01-07T11:02:17Z
last_indexed 2022-01-08T04:28:07Z
id cronfa59111
recordtype RisThesis
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spelling 2022-01-07T11:58:12.2823872 v2 59111 2022-01-07 Advanced characterisation of microstructural evolution and liquation mechanisms in RR1000 employing a novel semi-solid testing facility e1a55a976d4b4443f71f4a7e26bf5b5d SEAN JOHN SEAN JOHN true false 2022-01-07 Inertia friction welding is a joining technique that is used in many industries as it can create high quality welds with narrow heat affected zones. The nickel superalloy RR1000 is routinely joined via inertia friction welding, during the manufacture of compressor components for gas turbine engines, at Rolls-Royce Plc. The conditions experienced at the weld interface of an inertia friction weld are extreme, with a combination of rapid heating rates to high temperatures and severe strain rates. These conditions are such that liquation of RR1000 is to be expected. The liquation mechanisms of two variants of RR1000 have been investigated, building on previous research, to further understand the dynamic evolution of microstructure and mechanical properties during inertia friction welding of RR1000. This investigation was accomplished by the design and commissioning of a novel semi-solid testing facility. The facility underwent numerous modifications to allow representative replication of the conditions experienced during inertia friction welding. To investigate the liquation mechanisms occurring in RR1000, fine grain and coarse grain compression specimens were heated to temperatures between 900°C and 1200°C at heating rates between 1°Cs-1 and 25°Cs-1. The fine grain and coarse grain variants were found to liquate via two mechanisms. The fine grain primarily experienced constitutional liquation of the primary γ’ precipitates, while incipient melting of the γ phase was experienced by the coarse grain variant. The liquid propagation rate in both variants was characterised. The knowledge and understanding gained via the use of this facility was then applied to analyse the microstructures from a series of interrupted RR1000 inertia friction welds. Inspection of these interrupted welds revealed evidence of liquation like that observed in the specimens tested in the semi-solid testing facility. This research has given an insight into the role of liquation during inertia friction welding of RR1000. E-Thesis Swansea Materials Engineering, Nickel Superalloys, Microstructure, Evolution, Liquation, Mechanical testing 7 1 2022 2022-01-07 10.23889/SUthesis.59111 A selection of third party content is redacted or is partially redacted from this thesis due to copyright restrictions. COLLEGE NANME COLLEGE CODE Swansea University Davies, Helen Doctoral Ph.D EPSRC / Rolls-Royce 2022-01-07T11:58:12.2823872 2022-01-07T10:54:23.7580255 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised SEAN JOHN 1 Under embargo Under embargo 2022-01-07T11:50:45.5243270 Output 30296437 application/pdf Redacted version - open access true 2026-02-09T00:00:00.0000000 Copyright: The author, Sean E. John, 2021. true eng
title Advanced characterisation of microstructural evolution and liquation mechanisms in RR1000 employing a novel semi-solid testing facility
spellingShingle Advanced characterisation of microstructural evolution and liquation mechanisms in RR1000 employing a novel semi-solid testing facility
SEAN JOHN
title_short Advanced characterisation of microstructural evolution and liquation mechanisms in RR1000 employing a novel semi-solid testing facility
title_full Advanced characterisation of microstructural evolution and liquation mechanisms in RR1000 employing a novel semi-solid testing facility
title_fullStr Advanced characterisation of microstructural evolution and liquation mechanisms in RR1000 employing a novel semi-solid testing facility
title_full_unstemmed Advanced characterisation of microstructural evolution and liquation mechanisms in RR1000 employing a novel semi-solid testing facility
title_sort Advanced characterisation of microstructural evolution and liquation mechanisms in RR1000 employing a novel semi-solid testing facility
author_id_str_mv e1a55a976d4b4443f71f4a7e26bf5b5d
author_id_fullname_str_mv e1a55a976d4b4443f71f4a7e26bf5b5d_***_SEAN JOHN
author SEAN JOHN
author2 SEAN JOHN
format E-Thesis
publishDate 2022
institution Swansea University
doi_str_mv 10.23889/SUthesis.59111
college_str Faculty of Science and Engineering
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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 0
active_str 0
description Inertia friction welding is a joining technique that is used in many industries as it can create high quality welds with narrow heat affected zones. The nickel superalloy RR1000 is routinely joined via inertia friction welding, during the manufacture of compressor components for gas turbine engines, at Rolls-Royce Plc. The conditions experienced at the weld interface of an inertia friction weld are extreme, with a combination of rapid heating rates to high temperatures and severe strain rates. These conditions are such that liquation of RR1000 is to be expected. The liquation mechanisms of two variants of RR1000 have been investigated, building on previous research, to further understand the dynamic evolution of microstructure and mechanical properties during inertia friction welding of RR1000. This investigation was accomplished by the design and commissioning of a novel semi-solid testing facility. The facility underwent numerous modifications to allow representative replication of the conditions experienced during inertia friction welding. To investigate the liquation mechanisms occurring in RR1000, fine grain and coarse grain compression specimens were heated to temperatures between 900°C and 1200°C at heating rates between 1°Cs-1 and 25°Cs-1. The fine grain and coarse grain variants were found to liquate via two mechanisms. The fine grain primarily experienced constitutional liquation of the primary γ’ precipitates, while incipient melting of the γ phase was experienced by the coarse grain variant. The liquid propagation rate in both variants was characterised. The knowledge and understanding gained via the use of this facility was then applied to analyse the microstructures from a series of interrupted RR1000 inertia friction welds. Inspection of these interrupted welds revealed evidence of liquation like that observed in the specimens tested in the semi-solid testing facility. This research has given an insight into the role of liquation during inertia friction welding of RR1000.
published_date 2022-01-07T07:53:21Z
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score 11.056895

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