Abstract
The microstructural evolution and underlying mechanism of a new high strength, high toughness near β titanium alloy, β20C, during hot deformation, and heat treatment were studied qualitatively and quantitatively. It was found that dynamic recovery occurs mainly in β phase, while α phase undergoes both a dynamic recovery and continuous incomplete dynamic recrystallization with a fraction of high-angle grain boundaries (≥15°) of 21.1% under hot-rolling. Subsequently, α phase undergoes static recrystallization with an increasing fraction of high-angle grain boundaries (21.1%→60.7%) under annealing, while the grains are equiaxed with refined grain sizes of 1.63 µm observed from the rolling direction (RD) and 1.66 µm observed from the transverse direction (TD). Moreover, the average aspect ratio of the lamellar α phase was 2.44 observed from the RD and 3.12 observed from the TD after hot rolling, but decreased to 2.20 observed from the RD, and 2.53 observed from the TD after annealing. Furthermore, the strict Burgers’ relationship between α and β phases changed after hot-rolling and remains the distortion, even after the static recrystallization process of α phase during annealing.
Highlights
Titanium alloys are attractive materials for many different application fields, owing to their high specific strength and good toughness, combined with corrosion and creep resistance [1,2]
Numerous studies have shown that heat treatment and hot deformation have a remarkable influence on the microstructural evolution and mechanical properties of titanium alloys
Conclusions β20C alloy obtained after hot deformation and heat
Summary
Titanium alloys are attractive materials for many different application fields, owing to their high specific strength and good toughness, combined with corrosion and creep resistance [1,2]. Ti-5Al-5Mo-5V-3Cr-1Zr alloy by using the electron backscatter diffraction (EBSD) technique They illustrated that the deformation parameters have a significant effect on dynamic recrystallization, orientation, and the type of grain boundary. Numerous studies have shown that heat treatment and hot deformation have a remarkable influence on the microstructural evolution and mechanical properties of titanium alloys. The microstructure consists of fine equiaxed grains of 1–3 μm obtained after hot deformation and heat treatment, while the grain sizes of conventional titanium alloys are usually 10 μm or so via a similar process. Further research is required to understand its mechanisms of microstructural evolution and the orientation relationship between the α and β phases during hot deformation and heat treatment. A quantitative analysis of the orientation relationship is required
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