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Crystal plasticity, fatigue crack initiation and fatigue performance of advanced titanium alloys

E SACKETT, L GERMAIN, M BACHE, Elizabeth Sackett Orcid Logo

International Journal of Fatigue, Volume: 29, Issue: 9-11, Pages: 2015 - 2021

Swansea University Author: Elizabeth Sackett Orcid Logo

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Abstract

The fatigue behaviour of a novel large grained variant of the near α titanium alloy Ti 685 is described. Load controlled low cycle fatigue fractures in plain cylindrical specimens demonstrate the highly crystallographic nature of the failure process. When compared to similar data for conventional gr...

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Published in: International Journal of Fatigue
ISSN: 01421123
Published: 2007
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URI: https://cronfa.swan.ac.uk/Record/cronfa40102
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spelling 2018-05-11T12:39:14.7621744 v2 40102 2018-05-11 Crystal plasticity, fatigue crack initiation and fatigue performance of advanced titanium alloys 55d1695a53656de6b0bdfa4c08d8bcd4 0000-0002-5975-6967 Elizabeth Sackett Elizabeth Sackett true false 2018-05-11 MTLS The fatigue behaviour of a novel large grained variant of the near α titanium alloy Ti 685 is described. Load controlled low cycle fatigue fractures in plain cylindrical specimens demonstrate the highly crystallographic nature of the failure process. When compared to similar data for conventional grain size Ti 685 variants the LG685 material clearly offers reduced fatigue and static strength. An alternative flat plate specimen design was employed together with electronic speckle pattern interferometry and strain gauges to monitor the inhomogeneous strain accumulation in this large grained variant under load control conditions. Dwell fatigue tests indicated that the eventual location for crack initiation and subsequent failure could be identified as early as the first loading cycle. The precise crystallographic orientations of the surrounding microstructure were defined using electron back scattered diffraction. In contrast to previous models to describe facet formation and early fracture in this class of alloy, basal plane slip systems were not implicated. The use of EBSD to identify “effective structural units” of common orientation, which do not necessarily relate to colony size, will be demonstrated for both the large grained material and a conventional compressor disc alloy Timetal 834 in typical forged condition. Journal Article International Journal of Fatigue 29 9-11 2015 2021 01421123 31 12 2007 2007-12-31 10.1016/j.ijfatigue.2006.12.011 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2018-05-11T12:39:14.7621744 2018-05-11T12:39:14.7621744 College of Engineering Engineering E SACKETT 1 L GERMAIN 2 M BACHE 3 Elizabeth Sackett 0000-0002-5975-6967 4
title Crystal plasticity, fatigue crack initiation and fatigue performance of advanced titanium alloys
spellingShingle Crystal plasticity, fatigue crack initiation and fatigue performance of advanced titanium alloys
Elizabeth, Sackett
title_short Crystal plasticity, fatigue crack initiation and fatigue performance of advanced titanium alloys
title_full Crystal plasticity, fatigue crack initiation and fatigue performance of advanced titanium alloys
title_fullStr Crystal plasticity, fatigue crack initiation and fatigue performance of advanced titanium alloys
title_full_unstemmed Crystal plasticity, fatigue crack initiation and fatigue performance of advanced titanium alloys
title_sort Crystal plasticity, fatigue crack initiation and fatigue performance of advanced titanium alloys
author_id_str_mv 55d1695a53656de6b0bdfa4c08d8bcd4
author_id_fullname_str_mv 55d1695a53656de6b0bdfa4c08d8bcd4_***_Elizabeth, Sackett_***_0000-0002-5975-6967
author Elizabeth, Sackett
author2 E SACKETT
L GERMAIN
M BACHE
Elizabeth Sackett
format Journal article
container_title International Journal of Fatigue
container_volume 29
container_issue 9-11
container_start_page 2015
publishDate 2007
institution Swansea University
issn 01421123
doi_str_mv 10.1016/j.ijfatigue.2006.12.011
college_str College of Engineering
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hierarchy_top_id collegeofengineering
hierarchy_top_title College of Engineering
hierarchy_parent_id collegeofengineering
hierarchy_parent_title College of Engineering
department_str Engineering{{{_:::_}}}College of Engineering{{{_:::_}}}Engineering
document_store_str 0
active_str 0
description The fatigue behaviour of a novel large grained variant of the near α titanium alloy Ti 685 is described. Load controlled low cycle fatigue fractures in plain cylindrical specimens demonstrate the highly crystallographic nature of the failure process. When compared to similar data for conventional grain size Ti 685 variants the LG685 material clearly offers reduced fatigue and static strength. An alternative flat plate specimen design was employed together with electronic speckle pattern interferometry and strain gauges to monitor the inhomogeneous strain accumulation in this large grained variant under load control conditions. Dwell fatigue tests indicated that the eventual location for crack initiation and subsequent failure could be identified as early as the first loading cycle. The precise crystallographic orientations of the surrounding microstructure were defined using electron back scattered diffraction. In contrast to previous models to describe facet formation and early fracture in this class of alloy, basal plane slip systems were not implicated. The use of EBSD to identify “effective structural units” of common orientation, which do not necessarily relate to colony size, will be demonstrated for both the large grained material and a conventional compressor disc alloy Timetal 834 in typical forged condition.
published_date 2007-12-31T04:04:31Z
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score 10.853168