News

Heat treatment process and yield analysis of TC4 titanium alloy

1、 Introduction to TC4 Titanium Alloy
TC4 titanium alloy, also known as Ti-6Al-4V alloy, is an α - β titanium alloy with excellent comprehensive properties such as high strength, low density, corrosion resistance, and excellent processability. It is widely used in fields such as aerospace, medical equipment, and chemical equipment.
2、 TC4 Titanium Alloy Heat Treatment Process
1. Solid solution treatment
Solid solution treatment refers to heating TC4 titanium alloy to the α - β phase region, usually maintained at 950-1000 ℃ for a certain period of time, and then rapidly cooling to room temperature. The purpose of this process is to eliminate internal stress and improve the toughness and plasticity of the alloy. The structure after solid solution treatment is mainly composed of alpha phase and a small amount of beta phase.
Temperature: 950-1000 ℃
Duration: 1-2 hours
Cooling method: water quenching or rapid air cooling
2. Timeliness processing
Aging treatment is the second step after solid solution treatment, heating the alloy to 450-650 ℃ and maintaining it for a certain period of time to precipitate strengthening phases (such as Ti3Al and Ti6Al4V) from the parent phase, thereby improving the hardness and strength of the alloy. There are two commonly used temperature ranges for time sensitive processing:
Low temperature aging: 450-550 ℃, maintained for 8-24 hours, mainly used to improve strength and hardness.
High temperature aging: 550-650 ℃, maintained for 6-12 hours, mainly used to improve toughness and ductility.
3. Annealing treatment
Annealing treatment is mainly used to eliminate internal stresses generated during heat treatment or processing, and improve the plasticity and toughness of materials. The annealing temperature is usually between 700-800 ℃, with a holding time of 2-4 hours, and then cooled in the furnace.
Temperature: 700-800 ℃
Duration: 2-4 hours
Cooling method: furnace cooling
3、 Yield strength of TC4 titanium alloy
1. Yield strength
The yield strength of TC4 titanium alloy is a measure of the stress level at which the material begins to undergo plastic deformation. After heat treatment, the yield strength of TC4 titanium alloy can reach 850-900 MPa. This parameter is crucial in design and use, especially in applications that require high strength and reliability.
2. The effect of heat treatment on yield strength
After solution treatment: Due to the refinement of the alpha and beta phases in the tissue, the yield strength increases. The typical yield strength is around 850 MPa.
After aging treatment: Aging treatment can significantly improve the yield strength of alloys, especially low-temperature aging treatment, which can increase the yield strength to over 900 MPa. High temperature aging treatment mainly improves toughness, with a relatively small increase in yield strength.
3. Yield strength in application
In the aerospace field, TC4 titanium alloy is widely used to manufacture aircraft engine components and fuselage structural parts. These components require high yield strength and stable mechanical properties in high-temperature and high-pressure environments. Typical applications include:
Aircraft engine turbine blades: require high yield strength and fatigue resistance at high temperatures, usually through solid solution and low-temperature aging treatment.
Aircraft fuselage frame: requires lightweight and high-strength materials, often treated with solid solution and high-temperature aging to balance strength and toughness.
4. Yield strength data under different conditions
According to different heat treatment processes, the yield strength data of TC4 titanium alloy are as follows:
Untreated: Yield strength of approximately 750 MPa
Solution treatment: yield strength of approximately 850 MPa
Low temperature aging treatment: yield strength can reach 900-950 MPa
High temperature aging treatment: yield strength of approximately 880-920 MPa

[ 上一页 ] Heat treatment pro...[ 下一页 ] Analysis of Chemic...