期刊
METALS
卷 9, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/met9111200
关键词
Ti-407; dwell sensitive fatigue; quasi-cleavage facets; micro-texture; macro-zones
资金
- EPSRC Rolls-Royce Strategic Partnership in Structural Metallic Systems for Gas Turbines (EPSRC) [EP/H500383/1, EP/H022309/1]
- EPSRC [EP/E043917/1, EP/H500383/1] Funding Source: UKRI
The novel titanium alloy TIMETAL((R)) 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 of cost reduction opportunities, including improved machinability. Thermo-mechanical processing and its effects on microstructure and subsequent mechanical performance are characterised, including a detailed assessment of the fatigue and crack propagation properties. Demonstrating relatively strong behaviour under high-cycle fatigue loading, Ti-407 is nevertheless susceptible to time-dependent fatigue effects. Its sensitivity to dwell loading is quantified, and the associated deformation and fracture mechanisms responsible for controlling fatigue life are explored. The intimate relationship between thermo-mechanical processing, micro-texture and fatigue crack initiation through the generation of quasi-cleavage facets is highlighted. Consistent fatigue crack growth kinetics are demonstrated, independent of local microstructure.
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