Abstract
TIMETAL®407 (Ti-407) is a novel titanium alloy formulated as a medium strength, highly ductile alloy offering a range of manufacturing cost reduction opportunities. It can be used as a direct replacement for Ti-6Al-4V or Ti-3Al-2.5V alloys, particularly in applications where energy absorption during fracture or HCF endurance are the key design criteria. The effect of thermo-mechanical processing on microstructure has been characterised and the room temperature high cycle, low cycle and dwell cycle fatigue properties of Ti-407 containing 30-40% primary alpha volume fraction are presented and discussed. These results are compared with data generated from Ti-6Al-4V processed to provide a similar but non-standard microstructure and demonstrate that Ti-407 shows superior HCF endurance strength, despite having a significantly lower tensile and yield strength.
Highlights
Titanium alloys have been employed extensively within the aero-engine sector since the 1950s
Concentrating on Ti-407 alone, High cycle fatigue (HCF), Low cycle fatigue (LCF) and dwell data are plotted in Figure 3, with least squares best fit regression lines superimposed for each individual dataset
Compared to the non-standard variants of Ti-6-4 employed during the present study, Ti-407 offers a superior HCF fatigue strength
Summary
Titanium alloys have been employed extensively within the aero-engine sector since the 1950s. The high strength to weight ratio at low to intermediate service temperatures, good corrosion resistance and low density relative to that of competing metals, contribute to the production of lightweight and durable components with applications ranging from the large-scale fan blades and supporting discs at the front of the engine, through to relatively small vanes and blades in the high pressure compressor section. Ti-6-4 accounts for 50% of the total titanium production[1] This alloy is widely acknowledged as presenting a balance of mechanical properties including good fatigue performance with intermediate fracture toughness and moderately high tensile strength. Economic competition is encouraging more cost-effective production, leading to the development of bespoke alloys better suited for specific components in terms of both mechanical performance and ease of manufacture
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