The best way to improve the mechanical properties

Methods to improve the mechanical properties of forged blanks

the mechanical properties of forged blanks are related to many aspects:

first, materials

according to the types of forged metal materials, their mechanical properties are different. Carbon steel, alloy steel and non-ferrous alloys of copper, aluminum and other metals have good plasticity and can be forged. Cast iron has poor plasticity and is not malleable

II. Heating

1. Choose the appropriate forging temperature range according to different materials. Here are three nouns:

forging temperature range: the temperature range between the initial forging temperature and the final forging temperature

initial forging temperature: the maximum allowable heating temperature for metal material forging. If the temperature is too high, it is easy to produce thermal defects

final forging temperature: the minimum temperature at which metal materials are allowed to deform. The temperature is too low, the forging is laborious, and it is easy to cause fracture

therefore, it is very important to adopt an appropriate temperature range. When heating, the temperature can be measured by thermoelectric pyrometer or optical pyrometer, or judged by "fire color method", but there will be errors

2. Use appropriate heating equipment; There are usually two ways: flame heating and electric heating, which are determined by the processing volume and the material of the heated metal. Note: resistance furnace is recommended for high temperature alloy, high alloy steel and non-ferrous alloy

3. Prevent heating defects:

a) oxidation and decarburization. According to the understanding of the term, the oxidation co organizer: the Canadian composite Innovation Center (CIC) caused metal loss; Decarburization reduces the hardness and wear resistance of the metal surface

b) overheating and overburning. According to the understanding of nouns, overheating will lead to coarse metal grains, which can be made up in the process of heat treatment after forging; Overburning will destroy the bonding force between grains. As a control element, the forged manual regulating valve will be broken. The loss cannot be reversed, and the product and market cooperation relationship must not be reversed

c) internal cracks. It is commonly used in blanks with large size, and cracks occur in the blank. Usually, the reason is that the heating speed is too fast or the charging temperature is too high. Generally, high carbon steel is prone to this situation

III. forging. There is no way to say that it is related to the skills of workers to formulate appropriate technological processes

IV. cooling after forging. It is an important link to ensure the forging quality. Prevent hardening, deformation and cracks during cooling. There are three forms of air cooling, pit cooling and furnace cooling

v. as mentioned above, choose the appropriate heat treatment method according to the specific requirements

the forging process is very complex. It is recommended to consult relevant manuals and authorities. Because no matter whether there are big or small problems in the blank, it will increase the additional processing cost