Heat treatment

Heat treatment refers to a metal thermal processing technology that changes the chemical composition and structure of the surface or inside of the material in the solid state by means of heating, heat preservation and cooling to obtain the desired performance.

Substance with opaque, metallic luster, good thermal conductivity and electrical conductivity, and its electrical conductivity decreases with increasing temperature, and is rich in ductility and ductility. The solids (ie crystals) in which the atoms inside the metal are regularly arranged. It is composed of two or more metals or metals and non-metals, and has metallic properties. It refers to an independent and uniform component in a metal or alloy that has the same chemical composition, the same lattice structure, or the same atom aggregation state, and has a clear interface with other parts.

Metal heat treatment is one of the important processes in mechanical manufacturing. Compared with other processing techniques, heat treatment generally does not change the shape and overall chemical composition of the workpiece, but by changing the microstructure inside the workpiece or changing the chemical composition on the surface of the workpiece , Give or improve the performance of the workpiece. Its characteristic is to improve the inherent quality of the workpiece, which is generally not visible to the naked eye.

In order to make the metal workpieces have the required mechanical properties, physical properties and chemical properties, in addition to the reasonable selection of materials and various forming processes, heat treatment processes are often essential. Steel is the most widely used material in the machinery industry. The microstructure of steel is complex and can be controlled by heat treatment, so the heat treatment of steel is the main content of metal heat treatment. In addition, aluminum, copper, magnesium, titanium, etc. and their alloys can also change their mechanical, physical and chemical properties through heat treatment to obtain different performance.