Annealing, hardening and heat treatment of zinc
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Annealing
During annealing, the initial cast zinc is heated to a certain temperature, exposed and then slowly cooled. As a result, the metal has a more equiaxed structure, which increases its chemical homogeneity. Homogenizing annealing is used to equalize the chemical composition of the initial castings. After such heat treatment, intra-dendritic liquation of the alloys is minimized.
Homogenizing
Homogenization requires heating to a temperature of 320 to 340°С. The processing time is determined by the alloy grade and casting size, and usually ranges from 6 to 8 hours. After homogenization is complete, the castings are slowly cooled together with the furnace. In order to restore the plasticity of zinc alloys, which was liquefied as a result of cold deformation, a softening annealing is performed. It is performed at a lower temperature, which should not exceed 180...200 °C, with the operation duration of about 2...3 hours. Supplier Evek GmbH offers to buy blanks and semi-finished products made of zinc alloys at affordable price in wide range. We provide product delivery anywhere in the continent. The price is optimal.
Final heat treatment of zinc parts
Quenching and aging are such operations. Quenching of zinc alloys consists in a targeted phase change in solubility, which occurs when the products are heated to certain temperatures. Then the hardened alloy undergoes natural or artificial aging, during which the fine-dispersed α-phase is separated from the main β-phase as an intermetallic compound. As a consequence, the alloy increases its mechanical characteristics.
Heat treatment duration
The alloy exposure time at a given heating temperature for quenching is selected so that after quenching all the processes of dissolution of excess phases in the metal structure are completely passed. As the degree of dispersion of excess phases increases, their dissolution occurs faster. For dispersion hardening of zinc alloys, they are heated to temperatures of not less than 360°C for 5 to 8 hours, and then the workpieces are cooled in water.
Aging
For supersaturated zinc alloys, natural or artificial aging is performed further. Some zinc alloys (in particular, with aluminum and copper) possess the property of spontaneous aging. This should be taken into account when sizing finished products, since as a result of such aging, the linear dimensions and properties of zinc castings change.
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Are you interested in annealing, hardening and heat treatment of zinc? The supplier Evek GmbH offers to buy zinc corresponding to all requirements
