What is the heat treatment process of titanium alloy semi-finished product?
Publish Time: 2024-12-24
The heat treatment process of titanium alloy semi-finished product is the key link to ensure its stable performance and improve the quality of materials. This process mainly includes stress relief annealing, solution treatment and aging treatment, aiming to optimize the mechanical properties and corrosion resistance of titanium alloy.
First of all, stress relief annealing is the first step in the heat treatment of titanium alloy semi-finished product. The main purpose of this step is to eliminate or reduce the residual stress generated during the processing process to prevent the titanium alloy from deforming or cracking due to stress concentration during subsequent processing or use. Usually, the temperature of stress relief annealing is controlled below the recrystallization temperature of the titanium alloy to ensure that the microstructure of the material is not affected.
Secondly, solution treatment is an important means to improve the strength and hardness of titanium alloy. In this step, the titanium alloy semi-finished product will be heated to a high temperature so that the alloy elements are fully dissolved in the base metal to form a uniform solid solution. Subsequently, by rapid cooling, the high-temperature structure can be fixed, thereby obtaining excellent mechanical properties and corrosion resistance.
Finally, aging treatment is the final step of heat treatment of titanium alloy semi-finished product. In this step, titanium alloy semi-finished product will be kept at a lower temperature for a period of time, so that the metastable phase formed in the solution treatment will gradually decompose and precipitate fine dispersed phases. These dispersed phases can hinder the growth of grains and the movement of dislocations, thereby further improving the strength and hardness of titanium alloys.
It is worth noting that the heat treatment process of titanium alloys requires strict control of parameters such as heating temperature, holding time and cooling rate to ensure the ideal microstructure and performance. At the same time, in order to avoid adverse reactions such as oxidation or hydrogen absorption of titanium alloys during heat treatment, heat treatment is usually carried out in a vacuum furnace or argon protection.
In summary, the heat treatment process of titanium alloy semi-finished product is a complex and delicate process. Through reasonable process design and strict parameter control, the performance and quality of titanium alloys can be significantly improved to meet the needs of various application scenarios.
