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Fatigue Behaviour of the Novel Titanium Alloys TIMETAL® 407 and TIMETAL® 412 / WILLIAM DAVEY

Swansea University Author: WILLIAM DAVEY

  • Redacted version - open access under embargo until: 19th May 2026

DOI (Published version): 10.23889/SUthesis.58464

Abstract

TIMETAL®407 (Ti-407) is a medium strength (~650MPa 0.2%YS) titanium alloy, recently developed by TIMET, in conjunction with Rolls-Royce plc for use in applications requiring high energy absorption at impact. Preliminary Charpy Impact (V notch) testing showed Ti-407 to absorb nearly twice the impact...

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Published: Swansea 2021
Institution: Swansea University
Degree level: Doctoral
Degree name: EngD
Supervisor: Bache, Martin; Davies, Helen; Thomas, Matthew; Berment-Parr, Iain
URI: https://cronfa.swan.ac.uk/Record/cronfa58464
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first_indexed 2021-10-26T17:41:16Z
last_indexed 2021-10-27T03:23:57Z
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spelling 2021-10-26T19:02:49.0531211 v2 58464 2021-10-26 Fatigue Behaviour of the Novel Titanium Alloys TIMETAL® 407 and TIMETAL® 412 0463fbf4293a98cbe8cbd2e1e72d92cc WILLIAM DAVEY WILLIAM DAVEY true false 2021-10-26 TIMETAL®407 (Ti-407) is a medium strength (~650MPa 0.2%YS) titanium alloy, recently developed by TIMET, in conjunction with Rolls-Royce plc for use in applications requiring high energy absorption at impact. Preliminary Charpy Impact (V notch) testing showed Ti-407 to absorb nearly twice the impact energy of Ti-6-4 and exhibit more than 2.5 times the lateral expansion. Further initial testing suggested the high cycle fatigue (HCF) run out stress of Ti-407 matches that of Ti-6-4 and other high strength alpha-beta titanium alloys. Ti-407 displayed more than double the tool life than that of Ti-6-4. The reduction in tool wear supports lower forces required for faster, more efficient machining. Compared to Ti-6-4, the relatively low elevated temperature flow stress, greater malleability and wide process window should allow Ti-407 to be processed with fewer reheats, while exhibiting reduced surface cracking and giving a consistently good surface finish. Optimised Ti-407 manufacturing processes should allow parts to be formed closer to net shape giving higher yields and requiring less machining to the components finished size. This project has evaluated HCF, as well as low cycle fatigue (LCF) and dwell fatigue crack initiation mechanisms in Ti-407, to clarify the effects of alloy chemistry, microstructural morphology and scale, and crystallographic texture. A derivative of Ti-407, Ti-412 (~750MPa 0.2%YS) was also tested towards the end of the project and helped to further elucidate understanding of the fatigue characteristics of the two alloys. Of interest was the strong HCF response displayed relative to the monotonic tensile strength. As well as the investigation into the crack initiation mechanisms, an assessment of crack propagation across a range of microstructural conditions was carried out on Ti-407 material. E-Thesis Swansea 26 10 2021 2021-10-26 10.23889/SUthesis.58464 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 Bache, Martin; Davies, Helen; Thomas, Matthew; Berment-Parr, Iain Doctoral EngD 2021-10-26T19:02:49.0531211 2021-10-26T18:33:33.6969629 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised WILLIAM DAVEY 1 Under embargo Under embargo 2021-10-26T19:00:48.2983954 Output 38204742 application/pdf Redacted version - open access true 2026-05-19T00:00:00.0000000 Copyright: The author, William Davey, 2021. true eng
title Fatigue Behaviour of the Novel Titanium Alloys TIMETAL® 407 and TIMETAL® 412
spellingShingle Fatigue Behaviour of the Novel Titanium Alloys TIMETAL® 407 and TIMETAL® 412
WILLIAM DAVEY
title_short Fatigue Behaviour of the Novel Titanium Alloys TIMETAL® 407 and TIMETAL® 412
title_full Fatigue Behaviour of the Novel Titanium Alloys TIMETAL® 407 and TIMETAL® 412
title_fullStr Fatigue Behaviour of the Novel Titanium Alloys TIMETAL® 407 and TIMETAL® 412
title_full_unstemmed Fatigue Behaviour of the Novel Titanium Alloys TIMETAL® 407 and TIMETAL® 412
title_sort Fatigue Behaviour of the Novel Titanium Alloys TIMETAL® 407 and TIMETAL® 412
author_id_str_mv 0463fbf4293a98cbe8cbd2e1e72d92cc
author_id_fullname_str_mv 0463fbf4293a98cbe8cbd2e1e72d92cc_***_WILLIAM DAVEY
author WILLIAM DAVEY
author2 WILLIAM DAVEY
format E-Thesis
publishDate 2021
institution Swansea University
doi_str_mv 10.23889/SUthesis.58464
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 0
active_str 0
description TIMETAL®407 (Ti-407) is a medium strength (~650MPa 0.2%YS) titanium alloy, recently developed by TIMET, in conjunction with Rolls-Royce plc for use in applications requiring high energy absorption at impact. Preliminary Charpy Impact (V notch) testing showed Ti-407 to absorb nearly twice the impact energy of Ti-6-4 and exhibit more than 2.5 times the lateral expansion. Further initial testing suggested the high cycle fatigue (HCF) run out stress of Ti-407 matches that of Ti-6-4 and other high strength alpha-beta titanium alloys. Ti-407 displayed more than double the tool life than that of Ti-6-4. The reduction in tool wear supports lower forces required for faster, more efficient machining. Compared to Ti-6-4, the relatively low elevated temperature flow stress, greater malleability and wide process window should allow Ti-407 to be processed with fewer reheats, while exhibiting reduced surface cracking and giving a consistently good surface finish. Optimised Ti-407 manufacturing processes should allow parts to be formed closer to net shape giving higher yields and requiring less machining to the components finished size. This project has evaluated HCF, as well as low cycle fatigue (LCF) and dwell fatigue crack initiation mechanisms in Ti-407, to clarify the effects of alloy chemistry, microstructural morphology and scale, and crystallographic texture. A derivative of Ti-407, Ti-412 (~750MPa 0.2%YS) was also tested towards the end of the project and helped to further elucidate understanding of the fatigue characteristics of the two alloys. Of interest was the strong HCF response displayed relative to the monotonic tensile strength. As well as the investigation into the crack initiation mechanisms, an assessment of crack propagation across a range of microstructural conditions was carried out on Ti-407 material.
published_date 2021-10-26T04:15:01Z
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score 11.012678

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