Titanium alloy has good comprehensive properties, is an excellent structural material, and is widely used. However, the cost performance of titanium alloy is relatively low, the parts are difficult to machine, and the cost is high. Through casting methods, especially precision casting, parts with complex shapes can be directly manufactured, eliminating a large number of machining procedures and increasing the utilization rate of materials to nearly 90%.
Cast titanium alloys are usually divided into a, a+B and β alloys according to the phase composition, and are also divided into cast high-strength, heat-resistant and corrosion-resistant titanium alloys according to custom. Among them, cast Ti-6Ai-4V and T5Ai-2.5Sn are more widely used cast titanium alloys, which are characterized by medium strength, heat resistance, corrosion resistance, and good plasticity, which are especially suitable for aerospace engines and structural castings. . The cast Ti6242 alloy (Ti-6Ai-2sn-4Zr-2Mo) developed in the United States can work below 500 ℃ and can be used for compressor parts of aero engines, accounting for more than 2% of the casting titanium alloy. my country’s ZTC6 is a near-α-type titanium alloy developed with reference to Ti6242 alloy. The aluminum content of this alloy is controlled below 8%, and the high temperature thermal stability is good. It has been applied to engine parts below 500℃. ZTC3 (Ti-Al-Mo-Si series) can also be used for a long time below 500℃. Due to the addition of rare earth element Ce, the alloy has good heat resistance. The cast Ti153 alloy (Ti-15V-3Al-3Cr-3Sn) belongs to the metastable B-type high-strength titanium alloy. The alloy can be solid solution and aging strengthened. The strength of the alloy can reach more than 1200MPa, and the alloy has an elongation of more than 5%. Long rate. ZTC5 alloy is a high-strength titanium alloy developed by our country. It is an a+ type cast titanium alloy developed on the basis of Ti-Al-Mo-Sn-Zr series heat-resistant titanium alloy. It is improved by the addition of rapid eutectoid elements. The strength of the alloy during aging is not only high-strength and high-toughness, but also has good thermal stability when used below 350℃.
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