Annealing, quenching and heat treatment of zinc
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Preliminary heat treatment. Annealing
The initial workpiece is heated to a certain temperature, held, and then slowly cooled. As a result, the metal structure is more equiaxed and homogeneous. In order to equalize the chemical composition of the initial castings, homogenizing annealing is used. After such heat treatment, the intradendritic liquation of the alloys is minimized. Homogenization is performed at temperatures of 320… 340 ° C, and the processing time is determined by the alloy brand and the casting size. It is usually 6 to 8 hours. After the homogenization is completed, the castings are cooled slowly together with the furnace. In order to restore the ductility of the rolled product, which was liquefied by cold deformation, softening annealing is performed. It lasts 2−3 hours at a temperature of 180… 200 ° С. Supplier Avlob offers to buy zinc at a bargain price. The price is the best in this segment of rental.
Final heat treatment
Such operations are hardening and aging. For zinc alloys quenching consists in a purposeful change in phase solubility, which occurs during the heating of articles to certain temperatures. Further, the hardened alloy undergoes natural or artificial aging, when the fine-dispersed β-phase is separated from the main α-phase as an intermetallic compound. As a consequence, the alloy increases its mechanical characteristics.
Excerpt
The duration of aging of the alloy at a given heating temperature for quenching is chosen so that after the quenching all the processes of dissolving excess phases in the metal structure are completely passed. With an increase in the degree of dispersion of the excess phases, their dissolution occurs more rapidly. For dispersion hardening of zinc alloys, they are heated to temperatures of at least 360 ° C for 5… 8 h, and then the billets are cooled in water. For supersaturated zinc alloy, natural or artificial aging is further produced. Some alloys of zinc (in particular, with aluminum and copper) have the property of spontaneous aging. This should be taken into account when developing the dimensions of finished products, because as a result of this aging, the linear dimensions and properties of zinc casts change.
Delivery, price
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