48-OT3 Titanium Alloy Bar

48-OT3 Titanium Alloy Bar is a full-α alloy, containing a large number of α stable elements, including the main elements aluminum, boron and impurity elements oxygen, nitrogen and carbon, which can be solid soluble in α titanium and have a solid solution strengthening effect on the alloy. When the content (mass fraction) of aluminum, oxygen, nitrogen and carbon in the alloy is below 7%, 0.15%, 0.05% and 0.1%, the strength of the alloy increases with the increase of its content, while the plasticity does not decrease significantly.

The chemical composition of 48-OT3 titanium alloy rod is shown in Table 1.

Table 1 Chemical compositions of 48-OT3 alloy bars( w%)

2. The mechanical properties of bars with different chemical compositions after 1.5 h at 740 °×C and air cooling are shown in Table 2.

Table 2 Mechanical properties of 48-OT3 alloy bars with different chemical compositions

3. Effect of annealing temperature on the mechanical properties of 48-OT3 titanium alloy bar The mechanical properties after heat treatment by different processes are shown in Table 3.

Table 3 Mechanical properties of 48-OT3 alloy bars of different heat treatment processes %

4. Effects of different heat treatment processes on the impact toughness of 48-OT3 titanium alloy rods.

Table 4 Effect of annealing process on impact toughness of 48-OT3 alloy bars

1.The optimal annealing temperature of 48-OT3 titanium alloy bar is 700 ~ 750 °C, and the best holding time is 60 ~ 90 min.
2.When the annealing temperature of 48-OT3 titanium alloy bar is 700 ~ 750 °C and the insulation time is between 60 ~ 90 min, the strength, plasticity and impact properties are well matched, and its tensile strength is about 740 MPa, the yield strength is about 595 MPa, the elongation is about 14%, and the impact toughness is about 65 J/cm2.
3.The effect of annealing treatment on the strength, plasticity and microstructure of 48-OT3 titanium alloy bar was less than that of annealing temperature.

1. By increasing the content of aluminum, oxygen and nitrogen elements in 48-OT3 titanium alloy rods, the strength equivalent of aluminum is increased, so that the strength of the rod is significantly increased and the plasticity is slightly reduced.
2. When the annealing temperature is increased in the range of 700 ~ 800 °C, the strength of 48-OT3 titanium alloy rod decreases and the plasticity increases; At 740~780 °C, the bar has formed a uniform equiaxial structure, and the α phase has not been significantly coarsening and growing, so the strength and plasticity are the best matched.
3. Compared with air cooling, when 48-OT3 titanium alloy bar is cooled by furnace cooling and air cooling, the cooling speed is reduced, and the α phase is obviously spheroidized and grows, so the strength of the bar is reduced and the plasticity is significantly increased.

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