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High temperature performance and chemical composition analysis of TC4 titanium alloy

1、 Introduction to TC4 Titanium Alloy
TC4 titanium alloy, also known as Ti-6Al-4V alloy, is a high-performance alloy widely used in aerospace, shipbuilding, chemical and other fields. Its main components include titanium, aluminum, and vanadium, with titanium accounting for the majority, while aluminum and vanadium are added as alloying elements to improve its overall performance. TC4 titanium alloy has attracted much attention due to its excellent strength to weight ratio, corrosion resistance, and high temperature performance.
2、 Chemical composition of TC4 titanium alloy
Titanium (Ti): accounting for 89-91% of the total alloy content. Titanium, as the base metal, provides the basic framework of the alloy and excellent corrosion resistance.
Aluminum (Al): content ranging from 5.5-6.75%. The addition of aluminum can significantly improve the strength and hardness of the alloy, while reducing weight.
Vanadium (V): content is 3.5-4.5%. Vanadium helps to improve the high-temperature strength and toughness of alloys, maintaining stable mechanical properties in high-temperature environments.
Iron (Fe): content not exceeding 0.3%. Iron, as a trace element, has a relatively small impact on alloys, but its content needs to be strictly controlled to avoid affecting the properties of alloys.
Oxygen (O): Content not exceeding 0.2%. Excessive oxygen content can lead to alloy embrittlement, so it needs to be controlled at a lower level.
3、 Analysis of High Temperature Performance of TC4 Titanium Alloy
1. Antioxidant properties
TC4 titanium alloy exhibits excellent oxidation resistance in high-temperature environments. Below 500 ° C, its antioxidant performance is excellent, but at higher temperatures, its antioxidant performance may decrease. Research has shown that long-term use at 600 ° C significantly increases the oxidation rate of TC4 titanium alloy, but its oxidation resistance can be effectively improved through surface coating treatment.
2. High temperature strength
The high-temperature strength of TC4 titanium alloy decreases with increasing temperature. At room temperature, its tensile strength is about 950 MPa and yield strength is 880 MPa. But at 500 ° C, its tensile strength drops to around 600 MPa and its yield strength drops to 560 MPa. Nevertheless, TC4 titanium alloy maintains high strength at 500 ° C and is suitable for the manufacturing of high-temperature structural components.
3. High temperature creep performance
Creep refers to the plastic deformation of a material that occurs over time under high temperature and constant stress. TC4 titanium alloy has good creep performance below 400 ° C, but its creep rate significantly increases at temperatures of 500 ° C and above. By optimizing the heat treatment process, its high-temperature creep performance can be improved, thereby extending its service life in high-temperature environments.
4、 Application of TC4 Titanium Alloy
1. Aerospace field
In the aerospace field, TC4 titanium alloy is commonly used to manufacture aircraft engine compressor discs, turbine discs, and fuselage structural components. Its excellent high-temperature performance and lightweight characteristics make it play an important role in reducing aircraft weight and improving fuel efficiency.
2. Ship field
TC4 titanium alloy is mainly used in the shipbuilding industry to manufacture high-strength and corrosion-resistant components for submarines and ships. For example, the pressure resistant hull and propellers of submarines are made of TC4 titanium alloy material to ensure their long-term service life and reliability in seawater.
3. Chemical industry field
In the field of chemical engineering, TC4 titanium alloy is widely used to manufacture equipment such as reactors and heat exchangers. Its corrosion resistance enables it to be used for a long time in corrosive media, while its high temperature strength ensures the safe operation of the equipment under high temperature conditions.
5、 Heat treatment process of TC4 titanium alloy
The performance of TC4 titanium alloy largely depends on its heat treatment process. Common heat treatment processes include solution treatment and aging treatment. By reasonable heat treatment, the microstructure of the alloy can be optimized and its comprehensive properties can be improved. For example, after solid solution treatment and aging treatment, the tensile strength and yield strength of TC4 titanium alloy can reach 1100 MPa and 1000 MPa, respectively, significantly improving its performance in high-temperature environments.

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