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Microstructural Control of Fatigue Behaviour in a Novel α + β Titanium Alloy

Martin Bache, Helen Davies Orcid Logo, William Davey, Thomas, Berment-Parr

Metals, Volume: 9, Issue: 11, Start page: 1200

Swansea University Authors: Martin Bache, Helen Davies Orcid Logo, William Davey

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DOI (Published version): 10.3390/met9111200

Abstract

The novel titanium alloy TIMETAL® 407 (Ti-407) has been developed as an alternative to Ti-6Al-4V (Ti-6-4), for applications that demand relatively high ductility and energy absorption.Demonstrating a combination of lower strength and greater ductility, the alloy introduces a variety ofcost reduction...

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Published in: Metals
ISSN: 2075-4701
Published: MDPI AG 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa52224
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Abstract: The novel titanium alloy TIMETAL® 407 (Ti-407) has been developed as an alternative to Ti-6Al-4V (Ti-6-4), for applications that demand relatively high ductility and energy absorption.Demonstrating a combination of lower strength and greater ductility, the alloy introduces a variety ofcost reduction opportunities, including improved machinability. Thermo-mechanical processing andits effects on microstructure and subsequent mechanical performance are characterised, including adetailed assessment of the fatigue and crack propagation properties. Demonstrating relatively strongbehaviour under high-cycle fatigue loading, Ti-407 is nevertheless susceptible to time-dependentfatigue effects. Its sensitivity to dwell loading is quantified, and the associated deformation andfracture mechanisms responsible for controlling fatigue life are explored. The intimate relationshipbetween thermo-mechanical processing, micro-texture and fatigue crack initiation through thegeneration of quasi-cleavage facets is highlighted. Consistent fatigue crack growth kinetics aredemonstrated, independent of local microstructure.
Keywords: Ti-407, dwell sensitive fatigue, quasi-cleavage facets, micro-texture, macro-zones
College: Faculty of Science and Engineering
Issue: 11
Start Page: 1200