Homogenization annealing of heat treatment for metal materials

1. Purpose of homogenization

◆Beneficial for subsequent cold, hot processing or heat treatment of ingots or castings

Improve plasticity and reduce deformation resistance; reduce the possibility of overheating and overburning in quenching.

◆It is conducive to the final use performance of the processed products or castings of the ingot

1. Improve corrosion resistance;

2. Prevent layered organization and weaken the anisotropy of materials;

3. Improve the stability of the organization and prevent creep from changing the shape and size of the material;

4. Improve strength and plasticity. (Casting-Homogenization and solution treatment can be combined)

2. The advantages and disadvantages of various annealing processes:

√Low temperature homogenization annealing-insurance. There will be no over-burning, overheating, oxidation, inhalation, deformation and other problems are not serious, but difficult

In order to achieve the goal of uniform organization, even if it can be achieved, it will take a long time!

√High temperature homogenization annealing-risky, but the homogenization effect is good. High temperature and long-range diffusion are easy, the time required is short, and the benefit is

it is good. But it is prone to problems such as overheating, overburning, oxidation, inhalation, and deformation.

Most alloys cannot be subjected to high temperature homogenization annealing, especially those that are easy to oxidize and get gas. Dense surface

Oxide film, yes, but you must be cautious.

√Classification and homogenization annealing-first low temperature and then high temperature. Low temperature homogenization can reduce the possibility of overburning during high temperature homogenization

High temperature homogenization can accelerate the homogenization. It has the characteristics of both low-temperature homogenization annealing and high-temperature homogenization annealing.

bother.

Magnesium alloys mostly use a hierarchical heating process to achieve homogenization.

■In fact, a reasonable choice of homogenization annealing temperature needs to be determined by experiment, such as using metallographic method to observe and determine overheating or overburning

The lowest temperature.