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Heat treatment

  • Author:Memory
  • Source:Www.xy-global.com
  • Release on :2018-05-15
Heat treatment refers to a kind of metal heat processing technology that changes the chemical composition and structure on the surface or inside of a material by means of heating, heat preservation, and cooling in a solid state, and obtains desired properties.

It has thermal conductivity and electrical conductivity that are opaque and metallic luster, and its electrical conductivity decreases with increasing temperature, and it is rich in ductility and malleability. Metal internal atoms have a regularly arranged solid (ie crystal). A substance that consists of two or more metals or metals and nonmetals and that has metal properties. Refers to a metal or alloy that has the same chemical composition, the same crystal lattice structure, or the same atomic aggregation state, and has independent and homogeneous components with a clear interface with other parts.

Metal heat treatment is one of the important processes in mechanical manufacturing. Compared with other processing technologies, heat treatment generally does not change the shape of the workpiece and the overall chemical composition. Instead, it changes the microstructure inside the workpiece or changes the chemical composition of the workpiece surface. , 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 rational selection of materials and various forming processes, the heat treatment process is often indispensable. Steel is the most widely used material in the machinery industry. The microstructure of steel is complex and can be controlled by heat treatment. Therefore, the heat treatment of steel is the main content of metal heat treatment. In addition, aluminum, copper, magnesium, titanium, and their alloys can also be changed by heat treatment of their mechanical, physical and chemical properties to obtain different performance.