Smelting low-temperature solid-solution heat treatment method for die-casting aluminum alloy

Abstract

The invention relates to a smelting low-temperature solid-solution heat treatment method for a die-casting aluminum alloy. The smelting low-temperature solid-solution heat treatment method has significantly advancement compared with the background technology, and aims to solve the problem that the heat treatment cannot be conducted on a conventional die-cast aluminum alloy. The solid-solution temperature of the AlMgZnSi die-casting aluminum alloy is reduced by 60-100 DEG C, the heat treatment of the die castings is achieved, foaming and deformation of the castings are avoided, the hardness isimproved from127.02 HV before the heat treatment to 171.96 HV, the yield strength is improved from 253.58 Mpa before the heat treatment to 407.07 Mpa, the tensile strength is improved from 314.55Mpa before the heat treatment to 460.12 Mpa, the elongation rate is improved from 3.59% before heat treatment to 4.33%. The process method is accurate and informative in data, the fact that the low-temperature solid-solution heat treatment can be conducted on the die-casting aluminum alloy is represented, the mechanical performance is greatly improved after the low-temperature heat treatment, and the limitation of a traditional die-casting aluminum alloy is broken through.

Description

technical field [0001] The invention relates to a low-temperature solid solution heat treatment method for smelting die-casting aluminum alloys, which belongs to the technical field of non-ferrous metal material preparation performance treatment and application. Background technique [0002] Die casting is one of the important methods for the production of aluminum alloy castings. It is suitable for the production of castings with thin walls, complex shapes, and clear outlines. The castings have the characteristics of compact structure, good mechanical properties, high production efficiency, and low cost of mass production. [0003] Due to the high pressure and high speed characteristics of die casting, the solidification structure of castings is often accompanied by tiny pores. The main strengthening phase in the commonly used AlSiCu die-casting alloy is Al 2 Cu, its solution heat treatment needs to be completed at 500 ° C for several hours under the condition of heat pres...

AI Technical Summary

Problems solved by technology

The main strengthening phase in the commonly used AlSiCu die-casting alloy is Al 2 Cu, its solution heat treatment needs to be completed at 500 ° C for several hours under the condition of heat preservation; if it is subjected to solution heat treatment, the tiny pores in the casting will expand and cause surface bubbling or even deformation, so conventional die castings are usually not possible. Heat treatment improves the performance of castings, which greatly limits the application range of aluminum alloy die castings

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