Metal heat treatment is one of the important processes in mechanical manufacturing, compared with other processing technology, heat treatment generally does not change the shape of the workpiece and the overall chemical composition, but by changing the internal microstructure of the workpiece, or change the surface of the workpiece chemical composition, to give or improve the use of the workpiece performance. It is characterized by the improvement of the intrinsic quality of the workpiece, which is generally not visible to the naked eye. Therefore, it is a special process in machinery manufacturing, but also an important part of quality management.
In order to make metal workpiece have the required mechanical properties, physical properties and chemical properties, in addition to the rational selection of materials and various forming processes, heat treatment process is often necessary. Steel is the most widely used material in mechanical 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 and other alloys can also be changed by heat treatment of their mechanical, physical and chemical properties, to obtain different use performance.
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