Compared with other processing technologies, heat treatment generally does not change the shape and overall chemical composition of the workpiece, but endows or improves the performance of the workpiece by changing the microstructure inside the workpiece or the chemical composition on the surface of the workpiece. Its characteristic is to improve the internal quality of the workpiece, which is generally not visible to the naked eye. In order to make the metal parts have the required mechanical, physical and chemical properties, in addition to the reasonable selection of materials and various forming processes, heat treatment process is often essential. Steel is the most widely used material in mechanical industry, so the heat treatment of steel is the main content of metal heat treatment. In addition, aluminum, copper, magnesium, titanium and their alloys can also change their mechanical, physical and chemical properties through heat treatment to obtain different service properties.
Let's take a look at the excellent performance of aluminum plate after heat treatment today:
1. Heat treatment strengthening, high impact toughness, not sensitive to lack.
2. It has excellent thermoplasticity and can be extruded into various sections with complex structure, thin wall and hollow at high speed or forged into forgings with complex structure. The quenching temperature range is wide and the quenching sensitivity is low. After extrusion and forging demoulding, as long as the temperature is higher than the quenching temperature. That is, it can be quenched by water spray or water penetration. Thin walled parts (6 < 3mm) can also be air quenched.
3. The welding performance and corrosion resistance are excellent, and there is no tendency of stress corrosion cracking. The Al Mg Si alloy is the only one without stress corrosion cracking.
4. After processing, the surface is very smooth and easy to anodize and color. Its disadvantage is that if it is aged after quenching at room temperature for a period of time, it will bring adverse effect on the strength (parking effect).
On 2018-08-08 11:45:46
