Detailed Discussion Of TC17 Titanium Alloy Processing Technology

I. Characteristics of TC17 titanium alloy
High strength and toughness: TC17 titanium alloy has excellent strength and toughness, which can meet the requirements of high structural efficiency and high reliability.
High hardenability: its high hardenability makes it possible to obtain a uniform organizational structure in the heat treatment process.
Wide forging temperature range: The wide range of forging temperatures provides more flexibility in processing.
Corrosion resistance: It has good resistance to general corrosion, but its sensitivity needs to be considered in hot salt stress corrosion environments.
Second, processing technology
1. Forging technology
Traditional die forging: TC17 titanium alloy cake material is usually produced by traditional die forging process, i.e. in-die molding. This process can ensure that the forgings obtain accurate shape and size.
Free Forging: Although the free forging process is relatively rarely used in the production of TC17 titanium alloys, it is less expensive to produce and more maneuverable. By controlling the forging process, different organizational structures can be obtained, such as equiaxial organization and net basket organization. Different forging processes affect the microstructure and mechanical properties of forgings. For example, through specific heating and deformation control, a net basket organization with uniform and fine organization can be obtained, thus improving the room temperature tensile strength, yield strength and impact properties of forgings.

2. Heat treatment technology
Solid solution treatment: solid solution treatment is an important step in adjusting the organizational structure and properties of TC17 titanium alloy. According to different forging processes, the temperature and time of solid solution treatment will be different. For example, for materials with β forging, the solid solution treatment temperature is 800℃±10℃, and water quenching is carried out after 4 hours of heat preservation; while for materials with α+β forging, the combination treatment of 840℃±10℃ air cooling + 800℃±10℃ water quenching is used.
Aging treatment: aging treatment is a long time holding time within a certain temperature range to further adjust the properties of the alloy. the aging temperature of TC17 titanium alloy is usually between 585-685℃, and the typical aging system is 630℃ holding time for 8 hours of air-cooling.
Stress relief annealing: Stress relief annealing is mainly used to eliminate the internal stresses generated during processing and to improve the stability and service life of the alloy. The stress relief annealing temperature generally does not exceed the aging temperature, the holding time is usually 1-4 hours.
3. Surface treatment technology
Acid washing: Acid washing is a key step to remove the oxide layer and impurities on the surface of TC17 titanium alloy. The commonly used pickling solution is a mixture of hydrofluoric acid and nitric acid, and the surface cleanliness can be ensured by controlling the parameters of the pickling process.
Anodic oxidation: Anodic oxidation can form a dense oxide film on the surface of TC17 titanium alloy to improve its corrosion resistance and aesthetics. By controlling the parameters of electrolyte, voltage, temperature and time, the ideal oxide film layer can be obtained.
Application areas
With its excellent performance, TC17 titanium alloy has been widely used in aerospace, marine engineering and biomedical fields. For example, in the aerospace field, TC17 titanium alloy is used to manufacture key components such as aircraft wing skins, engine blades and structural components; in the field of marine engineering, it is used for submarine shells and marine platform components.
The processing technology of TC17 titanium alloy involves many aspects such as forging, heat treatment and surface treatment. By optimizing these process parameters, the performance and application range of TC17 titanium alloy can be further improved.