A heat treatment method for zinc-aluminum rolled strip

Abstract

The invention discloses a heat treatment method of a zinc-aluminum rolled strip. The heat treatment method is used for improving the plasticity and the stability of the zinc-aluminum rolled strip and comprises the following steps: (1), placing the zinc-aluminum rolled strip in a heating furnace for performing solution treatment at a temperature of 360 DEG C for 4-10 hours; (2), reducing the furnace temperature of the heating furnace to 250 DEG C, and preserving heat of the zinc-aluminum rolled strip at the temperature of 250 DEG C for 2-3 hours; and (3), after heat preservation, continuously reducing the furnace temperature of the heating furnace to 170 DEG C, and then taking the zinc-aluminum rolled strip out to ensure that the zinc-aluminum rolled strip is cooled to a room temperature in air. The zinc-aluminum rolled strip subjected to heat treatment by adopting the heat treatment method disclosed by the invention is subjected to repeated bending tests; the repeated bending times of the zinc-aluminum rolled strip subjected to heat treatment by adopting the heat treatment method disclosed by the invention is increased by 61 percent in comparison with that of an original rolled strip, a stable structure is obtained, and the mouldability is greatly improved. The heat treatment method disclosed by the invention is simple to operate, and strong in practicability; the obtained material is good in plasticity, stable in performance and difficult in aging.

Description

technical field [0001] The invention relates to the technical field of heat treatment of metal strips, in particular to a heat treatment method for zinc-aluminum rolled strips. Background technique [0002] At present, zinc-aluminum solder is a kind of solder with development prospects. The main process of zinc-aluminum flux-cored wire processing is first casting, then extrusion, then rolling, and finally drawing. In the extrusion and rolling process, material softening is carried out by recrystallization annealing. The rolled strip is formed into flux-cored wire by U-shaped drawing, and welding wires with different diameters are manufactured according to needs, so the plasticity of the strip before drawing directly determines the formability. If the plasticity of the material is good, the deformation amount of a single pass can be increased, the number of drawing times can be reduced, and the production efficiency can be improved. [0003] At the same time, under the cool...

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Problems solved by technology

[0003] At the same time, under the cooling conditions of casting, the zinc-aluminum alloy with high aluminum content (ω>15%) first precipitates the α primary phase, and then generates the peritectic phase β phase, and the eutectic reaction is likely to occur as the temperature decreases. The eutectoid solid phase reaction temperature is 277°C. Due to the fast cooling rate, there is no time for the eutectoid reaction to form a supersaturated phase at room temperature. The supersaturated phase is unstable at room temperature and prone to precipitation. Because the atoms of Al and Zn alloys The radius difference is large (r Al =0.1431nm, r Zn =0.1332nm), so it will cause the size of the material to be unstable, and the "aging phenomenon" will occur

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