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TA18 Titanium Alloy Ti-3Al-2.5V Titanium Alloy Rod TiAl7Mo4 Titanium Aluminum Molybdenum Alloy Round Rod.
TA18 Titanium Alloy Ti-3Al-2.5V Titanium Alloy Rod TiAl7Mo4 Titanium Aluminum Molybdenum Alloy Round Rod
TA18 Overview
It is a nearly α-type titanium alloy with a nominal composition of Ti-3Al-2.5V. It is developed for cold-processed pipe applications. Its strength is 20%-50% higher than pure titanium at room temperature and high temperature, and its welding performance and cold forming performance are better than TC4 alloy. TA18 alloy is generally used in the annealed state, and can also be used in the cold-processed and stress-relieved annealed state. The maximum operating temperature is about 315°C.
It is suitable for aircraft and engine hydraulic and fuel pipeline systems. The alloy can also be rolled into foil and strip, the former is mostly used in aircraft honeycomb structures.
Chemical composition:
Ti Residue
Al 5.5-6.5
V 3.5-4.5
Fe 0.3
C 0.08
N 0.05
H 0.015
O 0.15
TA18 heat treatment system
1) Annealing
The annealing of pipes and plates is carried out in a vacuum furnace. The pressure in the furnace should not be higher than 0.09Pa. The heating temperature is within the range of 650-790℃, the furnace temperature fluctuation range is ±15℃, and the temperature is kept for 30-120min, and the furnace is cooled.
2) Stress relief annealing
According to the provisions of GJB 3763-1999 "Titanium and Titanium Alloy Heat Treatment Specifications". 370-600℃, 15-240min, air cooling or furnace cooling.
TA18 smelting and casting process
The alloy should be smelted in a vacuum consumable electrode arc furnace for more than two times.
TA18 application overview and special requirements
TA18 alloy pipes have been used in a variety of aircraft, aerospace and civil aircraft as hydraulic, fuel and other pipeline systems. my country has also used it as air conditioning pipelines in transport aircraft, and will be used in aircraft engine pipeline systems. This alloy is suitable for manufacturing parts with working temperatures below 315℃ that require strength, oxidation resistance and welding performance.
TA18 usage recommendations
TA18 alloy pipes are used to manufacture hydraulic, fuel, lubricating oil and air pressure-bearing pipeline systems for aircraft and aircraft engines. Plates, strips and foils are used in aircraft honeycomb structures, and can also be used as other parts that require strength, cold forming and welding structures.
| Ti | Al | V | Fe | O | N | H | C |
| 89% and 90% | 5.5% to 6.5% | 3.5% to 4.5% | ≤ 0.3% | ≤ 0.15% | ≤ 0.05% | ≤ 0.015% | ≤ 0.08% |
The contents of these components have a significant impact on the properties of TA18 titanium alloy. For example, an increase in oxygen content will increase the strength of the alloy, but reduce its plasticity; excess hydrogen will lead to hydrogen embrittlement, making the alloy brittle.
Effect of ingredients on performance
The composition of TA18 titanium alloy has an important impact on its mechanical properties and corrosion resistance. Through appropriate heat treatment, such as solution treatment, aging treatment and quenching treatment, its performance can be significantly improved. Solution treatment is usually carried out in the temperature range of 900℃ to 950℃. It maintains the uniform structure of the alloy through rapid cooling, thereby improving strength and maintaining good plasticity and toughness.
Aging treatment is carried out in the temperature range of 500℃ to 600℃ to stabilize and strengthen the structure of the alloy and improve creep resistance and fatigue strength
Quenching treatment uses water quenching or oil quenching to improve the hardness and wear resistance of the alloy
Main application areas of TA18 titanium alloy
Aerospace field
In the aerospace field, TA18 titanium alloy is often used as a key material for aircraft engines, aircraft structural components and spacecraft due to its high strength, low density and excellent high temperature resistance. Its good corrosion resistance is particularly suitable for environments exposed to high temperatures and strong aerodynamic forces. For example, in the turbine blades and high-temperature structural parts of aircraft engines, TA18 alloy can provide sufficient strength and durability to ensure the stable operation of components under extreme conditions.
Chemical and marine engineering
Due to the excellent corrosion resistance of TA18 titanium alloy in strong acid, strong alkali and seawater environments, the alloy has been widely used in chemical equipment, offshore platforms and marine engineering. For example, TA18 titanium alloy materials are often used in seawater desalination equipment, petrochemical equipment and deep-sea oil and gas production to make core components such as pipes, containers, and heat exchangers. These applications require that the material not only has excellent corrosion resistance, but also has good mechanical strength and toughness, and TA18 alloy just meets these requirements.
Medical devices
TA18 titanium alloy is also gradually showing its unique advantages in the field of medical devices. Titanium alloy is widely used in medical devices such as artificial joints and dental implants due to its good biocompatibility. In this application, TA18 alloy can not only provide sufficient strength support, but also has good wear resistance and corrosion resistance, which helps to improve the service life of implants and patient comfort.