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Titanium alloys are used in many applications requiring high strength, low operating temperatures or good corrosion resistance. They can save weight and improve operating performance compared to steel. Their specific strength is also higher, allowing for significant weight savings in structures such as aeroplanes and cars. The titanium-based alloy Ti-10 2 3 (also known as 10 2 3 titanium) consists of 10% vanadium, 3% aluminium and 2% iron and is often used in aerospace and automotive components.
It is important to understand how the microstructure of a 10 2 3 titanium forging reacts to forming and heat treatment processes. A constitutive model has been developed and simulated using three different thermal histories for the Ti-10-2-3 alloy, which is then compared to experimental results. This provides an insight into how the forming, heat treatment and subsequent aging processes affect the mechanical properties of the material.
In the present study, a Ti-10-2-3 forging bar was provided by Beijing Institute of Aeronautical Materials. The b-transus temperature was metallographically measured to be 1068 K. In addition, the chemical compositions of the forging bar were analyzed by XRD. The XRD characterization showed that the surface region of the forging bar exhibited a preferential b phase orientation. During the grinding process, the b phase in the surface region was destabilized by the formation of martensite and a significant change in the initial preferred orientation of the b phase was observed in the surface region.
The XRD analysis of the solution treated and aged Ti-10-2-3 alloys shows that the b phase decomposition reactions in these specimens are rapid with respect to other beta titanium alloys such as Ti-5553. However, the kinetics of these alloys are significantly influenced by oxygen.