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Application of high-temperature, high-strength and high-toughness titanium alloy on aircraft

2021-08-20

High-strength titanium alloys refer to titanium alloys with room temperature strength greater than 1000MPa after heat treatment. The research and development of high-strength titanium alloys abroad is mainly based in the United States and Russia, and the products have been widely used. The research of high-strength titanium alloys in China has gradually transformed from imitation to independent research and development. For example, the typical performance of the TB10 alloy (Ti-3Al-5Mo-5V-2Cr) researched by the Beijing Nonferrous Metals Research Institute is: σb=1360MPa, KIC=67MPam1/2, which has been used in aerospace structural parts, aircraft fuselages, and wings .Ti-1300, Ti-5322 and other high-strength titanium alloys innovatively developed by the Northwest Institute of Nonferrous Metals. The tensile strength of Ti-1300 exceeds 1350MPa, the elongation rate exceeds 8%, and the fracture toughness exceeds 55MPa. The tensile strength exceeds 1300 MPa, and the elongation rate exceeds 7%.

Aerospace vehicles require titanium alloys to have excellent high temperature resistance. The first high-temperature titanium alloy in the world is Ti-6Al-4V titanium alloy developed by the United States. Ti-6Al-4V titanium alloy has both α+β two-phase characteristics. It has been widely used in the aerospace field. In order to maximize the effect of Al solid solution heat strengthening, Sn, Zr, Mo and Si are also added to titanium alloys, and IMI679, Ti6242 and IMI685, Ti6242S, IMI834, Ti1100, BT36, etc. have been successively developed. Alloy.

Application of Titanium Alloy on Aircraft.

At present, the internationally advanced high-temperature titanium alloys mainly include Ti1100 titanium alloy (Ti-6Al-2.75Sn-4.0Zr-0.4Mo-0.45Si-0.07O2-0.02Fe) developed in the United States, and its use temperature can reach 600 ℃, it has Lower toughness and larger fatigue crack growth rate; British I MI 83 4 (Ti -5.5Al-4Sn-4Zr-0.3Mo-1Nb-0.5Si-0.06C), while having excellent high temperature creep properties And fatigue performance, use temperature 590℃; BT36 (Ti-6.2Al-2Sn-3.6Zr-0.7Mo-0.15Si-5W), BT18Y (Ti-6.5Al-2.5Sn-4Zr-0.7Mo-1Nb- 0.2 5 S i), Ti633G (Ti- 6.5Al-3Sn-3Zr-1N b-0.3Mo-0.3Si- 0.2Gd) and Ti18 (Ti-6Al-2Sn-4Zr4Mo-1W-0.2Si) alloys, their service temperature Respectively 600 ℃, 550 ~ 600 ℃, 550 ℃ and 550 ℃.

The high-temperature alloys developed in my country mainly include Ti55 (Ti-5.5Al-4Sn-2Zr-1Mo-0.25Si-1Nd), Ti60 (Ti-5.8A l-4.8 Sn-2Zr-1Mo-0.35Si-0.85Nd) and Ti600 (Ti-6Al-2.8Sn-4Zr-0.5Mo-0.4Si-1Y), its use temperature is 550℃, 600℃, 600℃ respectively.

Application of Titanium Alloy on Aircraft Application of High Toughness Damage Tolerant Titanium Alloy on Engine Blade.

A typical high-strength and high-toughness titanium alloy is the Ti62222S alloy developed in the United States. This titanium alloy has good strength, plasticity and fracture toughness matching; high fatigue crack growth resistance; deep hardenability; high elastic modulus; good resistance to medium temperature Creep performance, room temperature rupture strength and yield strength are greater than 1300MPa and 1200MPa respectively, and its high temperature performance is also very good.

TC21 (Ti-6Al-2Sn-2Zr-2Mo-2Cr-1Nb-0.1Si) is a high-strength, high-toughness, damage-tolerant titanium alloy developed in my country. This titanium alloy has good strength, plasticity, fracture toughness, and crack growth rate It is a very promising high-strength, high-toughness, damage-tolerant structure titanium alloy. Large-size titanium rods produced from this titanium alloy have a fracture toughness of up to 90MPa.m1/2 under the premise of ensuring high strength at room temperature. The application of titanium and titanium alloys in the aerospace field Today, the most active field of titanium applications is aerospace.

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