Annealing, quenching and heat treatment of zinc
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Preliminary heat treatment of zinc and its alloys
For these alloys, as such an operation is used the annealing. When the annealing is done heating the original cast of zinc to a certain temperature, exposure and subsequent slow cooling. As a result, metal is a more equiaxed structure, which improves chemical homogeneity. In order to align the chemical composition of the initial casting is used homogenizing annealing. After such heat treatment, nutritiondata liquation of alloys is minimized. Homogenization carried out at temperatures of 320…340 °C, and the duration of treatment is determined by the mark of alloy and size of the castings, it is Usually from 6 to 8 h After homogenization is performed, slow cooling of the castings together with the furnace. To restore the ductility of zinc and its alloys, which was sigena caused by cold deformation, perform softening annealing. It runs at a lower temperature, which should not exceed 180…200 °C, the duration of operation is about 2…3 hours.
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The final heat treatment of parts made of zinc and its alloys
Such operations are quenching and aging. For zinc and zinc alloys, annealing consists in purposeful changing the solubility of phases that occurs in the process of heating the products to a certain temperature. Next, the alloy is tempered natural or artificial aging in which from the primary α-phase is a selection of fine β-phase in the form of intermetallic compounds. As a consequence, the alloy improves its mechanical characteristics.
The duration of exposure of the alloy at a given temperature of heating for hardening is selected so that after hardening has completed all the processes of dissolution of the excess phase in the metal structure. With increasing degree of dispersion of the excess phases of their dissolution is faster. For dispersion hardening of alloys of zinc, they produce heat to temperatures of at least 360 °C for 5 to 8 h, and then perform a cooling of preforms in the water.
For the supersaturated alloy of zinc continue to produce natural or artificial aging. Some zinc alloys (in particular aluminium and copper) have the property of spontaneous aging. This should be considered when designing the dimensions of finished products, as a result of the aging linear dimensions and properties of zinc casting change.
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