3D printing process for high-strength aluminium copper alloy

Abstract

The invention relates to a 3D printing process for high-strength aluminium copper alloy, and belongs to the technical field of 3D printing. The 3D printing process comprises the steps of firstly, mixing the raw materials of the high-strength aluminium copper alloy through heating and melting uniformly; then, making the molten high-strength aluminium copper alloy into high-quality aluminium copperalloy powder with a gas atomization technology, and obtaining the aluminium copper alloy powder for 3D printing after drying; and regulating printing parameters, and performing 3D printing according to 3D model data of a part in printing equipment with inert gas introduced to obtain a 3D printing product using the high-strength aluminium copper alloy as the raw materials. Compared with the prior art, the 3D printing process has the advantages that the relative density of the product printed with the process can reach 99% and above, and the Vickers hardness can reach 120HV and above; the tensile strength can reach 450 MPa and above, and the elongation rate can reach 10%; through proper heat treatment, the Vickers hardness of a sample can reach 135HV and above, and the tensile strength can be further improved to 500 MPa and above; and the elongation rate remains 10% or above.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and in particular relates to a 3D printing process method of a high-strength aluminum-copper alloy. Background technique [0002] 3D printing is a preparation technology that uses three-dimensional model data to obtain products with complex shapes through layer-by-layer accumulation. Compared with the preparation methods of traditional plastics, ceramics, metals and alloys, and composite materials, 3D printing technology has a series of advantages such as the ability to prepare high-precision and complex-shaped products, save raw materials, and save costs, and has a good application prospect. Currently commonly used 3D printing methods include direct three-dimensional printing technology (3DP), selective laser melting technology (SLM), stereolithography technology (SLA), fused deposition technology (FDM), etc., among which selective laser melting technology (SLM) It is widely used in 3D prin...

AI Technical Summary

Problems solved by technology

The aluminum-silicon alloy prepared by SLM technology has a maximum tensile strength of about 450MPa, an elongation of about 4%, moderate tensile strength and low elongation

2xxx, 7xxx and other series of aluminum alloys with higher strength and better ductility often produce a large number of cracks during SLM processing, resulting in poor product performance, which is far from being comparable to conventionally manufactured aluminum alloys

At present, the ductility of the aluminum-silicon alloy prepared by SLM is slightly increased after heat treatment, but the tensile properties will be greatly reduced. The effect of heat treatment on improving its performance is limited, but it will destroy its fine microstructure, resulting in a decrease in performance.

[0005] 2xxx aluminum alloys have high specific strength, excellent fatigue properties and good damage resistance, and are widely used in aerospace and other fields, but the aluminum-copper alloys prepared by traditional methods need to undergo complex post-processing (heat treatment, cold working, hot working and / or stretching), in order to obtain optimized properties, such as high strength, etc.

However, the content of rare earth elements is low and the price is expensive, which is not conducive to large-scale promotion and application