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Alloy strengthening treatment

While the new process of melting alloy secondary smelting 1 time longer than normal times, but its alloy consumption did not increase too much, and because the old process has high-temperature melting copper links, so that the business process is slightly higher than the total energy consumption of the new process, or both flat. Experiment measured the total fusion of old and new technology loss rate average was about $ 1. 35% and 1. 12%. Therefore, the new technology in some economic advantage. New technology of melt copper in zinc alloy melting, it can achieve direct melting at low temperatures, which overcome the drawbacks of conventional secondary smelting process, is economical, convenient and practical. Preparation of selected alloys elastic Frequency Coreless Induction furnace is appropriate, because the oven seal is good, in the process of with or without charcoal less coverage, and automatic mixing function can make the alloy composition of the melt evenly, good effect of slag, and reduces labor intensity and lang Corporation. But still the fast note, refining agent added can significantly improve the quality of die-cast zinc alloy ingots, but alloys the melting rate increases, should, where appropriate, control on the production quantity of refining agent added.

Zinc alloy cable in the reinforcement directly from the substrate caused by solution strengthening and intermediate phase dispersion-strengthened. Casting is heated to temperatures as high as possible, close to the eutectic melting point, the temperature remains sufficiently long time, then rapidly cooled, so strengthening components to maximize dissolved, this casting under high temperature conditions is fixed save to a process known as solid solution at room temperature. Treatment is aimed at the Elimination of castings during solidification of dendritic segregation and large of toughening phase in whole or in part into the base, then fine and uniform precipitation distribution in the cooling process of the secondary phase. Solution heat treatment can improve the strength and ductility of the casting, and improving the corrosion resistance of alloys.

Factors influencing the effect of solution treatment solution treatment temperature and holding time and cooling rate. The higher the temperature, strengthening elements dissolve faster, strengthened the better. Enhanced solution in order to get the best results, without alloy burning, sometimes adopting a classification method of heating, insulation in low melting point eutectic temperature, the proliferation of dissolved components, low melting point eutectic does not exist, to rise to a higher temperature for insulating and quenching. Holding time is decided by the strengthening elements of dissolution rate, depending on the type of alloy, composition, organization, the shape and thickness of the casting method and casting. Hardening for casting cooling rate is more due to their preserved high temperature the melt had higher saturation, thus making castings for high mechanical properties, but at the same time by the formation of greater stress and deformation of casting greater possibilities.

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