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High temperature performance and chemical composition analysis of TA18 titanium alloy

1、 Introduction to TA18 Titanium Alloy
TA18 titanium alloy is an alpha beta type titanium alloy with excellent comprehensive properties, widely used in aerospace, chemical, and marine engineering fields. Its unique high-temperature performance and chemical composition make it perform well in these applications.
2、 Chemical Composition Analysis of TA18 Titanium Alloy
The chemical composition of TA18 titanium alloy determines its excellent performance. The typical components are as follows (mass percentage):
Titanium (Ti): Excess
Aluminum (Al): 5.5-6.5%
Vanadium (V): 3.5-4.5%
Iron (Fe): ≤ 0.30%
Oxygen (O): ≤ 0.15%
Nitrogen (N): ≤ 0.05%
Hydrogen (H): ≤ 0.015%
Carbon (C): ≤ 0.08%
The synergistic effect of these elements endows TA18 titanium alloy with high strength, low density, and good corrosion resistance.
3、 High temperature performance of TA18 titanium alloy
High temperature strength
TA18 titanium alloy maintains high strength at high temperatures, giving it excellent deformation resistance in high-temperature environments. The following table lists the tensile strength of TA18 titanium alloy at different temperatures:
|Temperature (℃) | Tensile strength (MPa)|
High temperature creep performance
Creep is the phenomenon of slow deformation of materials under high temperature and constant stress. TA18 titanium alloy has good creep resistance below 600 ℃ and is suitable for structural components that work under high temperature conditions for a long time. The specific creep data is as follows:
|Temperature (℃) | Stress (MPa) | Creep rate (%/1000 hours)|
High temperature antioxidant performance
TA18 titanium alloy has good oxidation resistance in high temperature environments and can effectively resist the formation and growth of oxide layers. This characteristic makes it perform excellently in high-temperature oxidation environments, extending its service life.
4、 Microstructure analysis of TA18 titanium alloy
α - β phase structure
The microstructure of TA18 titanium alloy is mainly composed of alpha phase and beta phase. The addition of aluminum stabilizes the alpha phase, while the addition of vanadium stabilizes the beta phase. This dual phase structure provides excellent mechanical properties and high-temperature stability.
Phase transition temperature
The beta transition temperature of TA18 titanium alloy is about 995 ℃, above which the alloy is mainly in the beta phase. Below this temperature, the alloy exhibits an α+β biphasic structure. By controlling the heat treatment process, the microstructure can be optimized to regulate the properties of the alloy.
5、 TA18 Titanium Alloy Heat Treatment Process
Solid solution treatment
Solid solution treatment involves heating the alloy above its beta transition temperature (typically around 995 ℃) and then rapidly cooling it to obtain a uniform beta phase structure. After solution treatment, the strength of the alloy can be further improved through aging treatment.
Timeliness processing
Aging treatment is usually carried out within the range of 300 ℃ to 500 ℃, with the aim of improving the hardness and strength of the alloy by precipitating strengthening phases. The selection of processing time and temperature has a significant impact on the final performance.
6、 Application examples of TA18 titanium alloy
Aerospace field
In the aerospace industry, TA18 titanium alloy is commonly used to manufacture engine components, fuselage structures, and landing gear. These components require excellent performance under high temperature and high stress conditions. The high temperature strength and oxidation resistance of TA18 titanium alloy make it an ideal material choice.
Chemical equipment
TA18 titanium alloy is also widely used in chemical equipment, such as heat exchangers, reactors, and storage tanks. Its excellent corrosion resistance and high temperature stability ensure long life and reliability in corrosive environments.
Ocean Engineering
In ocean engineering, TA18 titanium alloy is used to manufacture submarines, deep-sea exploration equipment, and subsea pipelines. Its resistance to seawater corrosion and high strength make it perform well in harsh marine environments.

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