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A re-assessment of Ti-685 as a dwell sensitive titanium alloy and a definition for engineering relevant dwell behaviour
International Journal of Fatigue, Volume: 178
Swansea University Authors:
Martin Bache, Jing Li, Helen Davies
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© 2023 The Authors. Published by Elsevier Ltd. Distributed under the terms of a Creative Commons Attribution 4.0 International License (CC BY 4.0).
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DOI (Published version): 10.1016/j.ijfatigue.2023.108008
Abstract
It is believed that the near-α titanium alloy Ti-685 was the first to demonstrate dwell sensitive fatigue behaviour whilst under engineering service as a gas turbine fan disc material. New fatigue data, micro-textural characterisation and fractography from a recent study which utilised remnant Ti-68...
| Published in: | International Journal of Fatigue |
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| ISSN: | 0142-1123 1879-3452 |
| Published: |
Elsevier BV
2024
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa64765 |
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| Abstract: |
It is believed that the near-α titanium alloy Ti-685 was the first to demonstrate dwell sensitive fatigue behaviour whilst under engineering service as a gas turbine fan disc material. New fatigue data, micro-textural characterisation and fractography from a recent study which utilised remnant Ti-685 specimens originally manufactured for previous laboratory campaigns based at Swansea dating back to the late 1980s are now reported. In isolation, the present results failed to demonstrate a significant dwell effect in either aligned or basketweave microstructural variants. On this occasion, the limited sensitivity to dwell loading was explained by the combination of heat treatment artifacts and selection of a relatively small test specimen geometry. However, the present data were also reviewed in the context of the wider fatigue database generated by multiple studies over the past fifty years. In combination, stress-life (SN) curves defined the magnitude in applied peak stress necessary to demonstrate a dwell effect in this alloy. Ultimately, this facilitated a fundamental definition of dwell sensitivity that is relevant to the engineering community. |
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| Keywords: |
Ti-685, fatigue, dwell sensitivity, microstructurally textured regions, quasi-cleavage facets |
| College: |
Faculty of Science and Engineering |
| Funders: |
Swansea University.
All of the current mechanical tests were conducted at Swansea Materials Research & Testing Ltd. Recent technical discussions with Prof. Emeritus W.J. Evans are greatly appreciated. |