On 2018-08-08 14:48:54
Heat treatment improves various properties of workpieces
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. The microstructure of steel is complex and can be controlled by heat treatment, so heat treatment of steel is the main content of 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.
To introduce the specific content of heat treatment process:
1. Normalizing: the heat treatment process of pearlite like structure is obtained by heating the steel or steel piece to a proper temperature above the critical point AC3 or ACM and keeping it in air for a certain period of time.
2. Annealing: the heat treatment process that the steel workpiece is heated to 20 40 ° C above AC3 and cooled slowly with the furnace to 500 ° C below in air after holding for a period of time.
3. Solution heat treatment: heat the alloy to the high temperature single-phase area and keep the temperature constant, so that the excess phase can be fully dissolved in the solid solution, and then rapidly cool to obtain the heat treatment process of supersaturated solid solution.
4. Aging: after solution heat treatment or cold plastic deformation, when the alloy is placed at or slightly higher than room temperature, its properties change with time.
Heat treatment is one of the important processes in the manufacturing process of mechanical parts and tools. Generally speaking, it can guarantee and improve various properties of workpiece, such as wear resistance, corrosion resistance, etc. Heat treatment can also improve the structure and stress state of the blank, so as to facilitate all kinds of cold and hot processing.