TB6 Titanium Alloy Rod

The nominal composition of TB6 Titanium Alloy Rod is Ti-10V-2Fe-3Al, with the domestic designation TB6 alloy. The corresponding designations in the United States is TB6, in the United Kingdom is IMI310, and in France is Ti-P.80. It is a near-α titanium alloy from the Ti-Al-V system, containing 3% α stabilizing element Al and 10% isomorphous (3% stabilizing element V and 2% eutectoid β stabilizing element Fe). The aluminum equivalent of TB6 titanium alloy's nominal composition is 4.0, and its molybdenum equivalent is 11.1, with the total content of β stabilizing elements close to the critical concentration (11%). The increase in total content of β stabilizing elements enhances the heat treatment strengthening ability of the alloy. A small amount of the α stabilizing element Al not only further strengthens the α phase but can also suppress the formation of a β phase during the quenching and aging processes. Unlike two-phase (α β) alloys, TB6 β alloys do not undergo martensitic transformation when quenched to room temperature; instead, they produce a metastable β. The α phase can precipitate from the metastable β phase as very fine, highly fractionated, non-deformable particles, thus the main characteristic of β alloys is the ability to harden to a relatively high yield stress level. Another advantage of β alloys is that their hot processing temperature is lower than that of two-phase alloys, and some highly stable β alloys can be cold deformed. In addition, β alloys also exhibit superior corrosion resistance compared to two-phase alloys.

1. Chemical Composition

The chemical composition of TB6 Titanium Alloy Rod is shown in Table 1.

2. Mechanical properties of TB6 titanium alloy bar under different heat treatment regimes.

The mechanical properties at room temperature are shown in Table 2. 

The mechanical properties at 300℃ are shown in Table 3.

3. The low-magnification structure of TB6 bars after solution treatment at different temperatures and aging is shown in Figure 1, while the microstructure of TB6 bars is shown in Figure 2.

The preparation of TB6 titanium alloy bar adopts large specification ingot smelting, three times vacuum consumable smelting, and increases the arc stabilizing current (12A) for the smelting method. The melting speeds for the three times are as follows: first ingot 8kg/min, second ingot 12kg/min, third ingot 7kg/min. After deoxidizing the ingot, samples are taken for non-destructive testing. Figure 3 shows the smelting of a Φ760mm ingot.

TB6 titanium alloy bar are supplied with turned (ground) surfaces. The surface roughness of the bars shall not exceed 3.2μm. Local defects on the surface of the bars should be removed, and the depth of removal shall not exceed the corresponding dimensional tolerance of the product; furthermore, the ratio of the depth to the width of the removed area shall not exceed 1:6. The surface of the bars shall not have minor defects such as scratches, dents, pitting, and wrinkles that are larger than half of the allowable tolerance in diameter or thickness.

Shaanxi Hangyu Nonferrous Metal Processing Co., Ltd. was established in December 2005. It is a high-tech enterprise mainly forging and deep processing of precision parts such as titanium and titanium alloys, nickel, zirconium and other non-ferrous metal materials. Its product scope covers aerospace, weapons, marine equipment and petrochemical fields. The production capacity of titanium and titanium alloy rods, forgings and plates reaches 3,000 tons/year, and the machine-added capacity of non-ferrous metal precision parts reaches 500,000 pieces/year, and has the ability to deep processing of the entire industrial chain from titanium and titanium alloy raw materials to precision parts.

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