Method for adjusting and controlling coarse second phase of 2219 aluminum alloy ring part

Abstract

The invention discloses a method for adjusting and controlling the coarse second phase of a 2219 aluminum alloy ring part. The method comprises the processes of multi-direction forging cogging, medium-low-temperature shack reaming, high-temperature annealing, medium-low-temperature ring part rolling and heat treatment. The method adopts medium-low-temperature shack reaming+ high-temperature annealing and medium-low-temperature ring part rolling-solid solution, the coarse second phase is thoroughly crushed through the lower-temperature deformation shearing function, the dynamic recovery is suppressed by using the lower temperature condition to generate a high-density element diffusion misalignment channel, in the follow-up high-temperature annealing process, the thorough dissolution of thesecond phase after crushing is achieved, and the mechanical properties of the ring part are improved accordingly.

Description

technical field [0001] The invention belongs to the technical field of deformation heat treatment of metal materials, and in particular relates to a method for controlling the coarse second phase of a 2219 aluminum alloy ring. Background technique [0002] 2219 aluminum alloy is Al-Cu series, heat treatment strengthened aluminum alloy. The alloy has the characteristics of high specific strength, good mechanical properties at low temperature and high temperature, and good welding performance, and has been widely used in the aerospace field. Among them, the transition ring of the launch vehicle storage tank is an important application of 2219 aluminum alloy. The ring is used to connect the barrel section of the storage tank, the front and rear bottoms, and the inter-box section of the rocket. It is a key part of force transmission and requires extremely high mechanical properties. The copper content of 2219 aluminum alloy is 5.8% to 6.8%, which exceeds the maximum solubility...

AI Technical Summary

Problems solved by technology

However, the dynamic recovery effect of aluminum alloy is significant under high temperature conditions, the dislocation density is low, the diffusion channel of copper element is insufficient, and the large-sized second phase particles are difficult to fully diffuse and dissolve, and there is still a small amount of coarse Al in the large ring after forming. 2 Cu second-phase particles lead to low performance of local points, and at the same time, excessive deformation of ring rolling leads to significant anisotropy of ring parts, so this process is difficult to meet the manufacturing of 2219 aluminum alloy ring parts with higher performance indicators

Images