Abstract
Aerospace components in jet engines need to outstand extreme conditions of high-temperatures and loads. Moreover, these components can sometimes undergo dynamic conditions if impact occurs during the flight. It is critical to understand the behaviour of aerospace alloys under these combined extreme conditions of high-temperature and dynamics loads. One of the most extended alloys used in the compressor and fan stages of commercial jet engines is Ti-6Al4V. The dynamic properties of Ti-6Al-4V are strongly dependent on the microstructure state and the temperature conditions. However, these dependencies are yet not fully understood. Moreover, this alloy can present a wide variety of microstructures depending on the component and manufacturing methods. In this work, we compare the response of five typical Ti-6Al-4V microstructures tested under static and dynamic conditions and different temperatures. The macroscopic response of the alloy is rationalised on the basis of its microstructural state using combined microscopy characterisation and computational modelling. To this end, computational plastic models are constructed and validated against experimental observations. In this way, the relationship between the mechanical properties of each microstructure and the temperature and strain rate conditions can be extracted to optimize the material state under specific dynamics in-service conditions.
Highlights
The aerospace industry requires materials with great resistance, reliability, and good behaviour against corrosion and oxidation, but which at the same time are as light as possible
Dynamics conditions during service can occur in an event of impact, so it is vital to understand the behaviour of this alloy under dynamic loads in combination of high temperatures
There is an increase of ductility from the static to dynamic condition at room temperature (RT) for the β annealing case
Summary
The aerospace industry requires materials with great resistance, reliability, and good behaviour against corrosion and oxidation, but which at the same time are as light as possible. Being far from being the titanium alloy with the best mechanical properties of all those available, but its good combination of properties and its versatility in their mechanical properties through the application of different heat treatments, makes it a preferable choice for structural components in jet-engine engines. These components can be subjected to a wide variety of extreme temperature and loading conditions. The mechanical properties have a strong dependence on the microstructure as mentioned before and this alloy presents a great variety depending on the component and the manufacturing methods.[1]
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