Heat treatment process of aluminum alloy components, aluminum alloy components and 3D printing method

Abstract

The invention relates to the technical field of material machining, and specifically relates to a heat treatment process of an aluminum-silicon aluminum alloy component of additive manufacturing, an aluminum alloy component and a 3D printing method. The process comprises the following steps that heating treatment is carried out on the component, and heating is carried out to a stress relief treatment temperature; and the stress relief treatment temperature is controlled to be 160-180 DEG C, and heat preservation is kept for 120-150 minutes; the heating treatment is continued, the component isheated to a de-plasticizing toughening treatment temperature; a plastic toughening treatment temperature is controlled to be 260-300 DEG C, and the heat preservation is kept for 30-50 minutes; and cooling is carried out. The residual stress of a component material is removed by the stress relief treatment, meanwhile, the cores of the Si phase particles are more formed in a material matrix, the number of the Si phase particles is increased, and the rapid growth of the Si phase is inhibited; the strengthening effect brought by rapid solidification when the component material is printed and formed through the plastic toughening treatment, the plastic toughness of the material is improved, meanwhile, a high-temperature short-time treatment mode enables the cores of the Si phase formed in an earlier stage only generates a small amount of growth, so that the residual stress of a treated part is small, and the plastic toughness is improved.

Description

technical field [0001] The present application relates to the technical field of material processing, specifically, to a heat treatment process of an aluminum-silicon-based aluminum alloy component manufactured by additive manufacturing, to an aluminum alloy component, and to a 3D printing method for an aluminum alloy component. Background technique [0002] Al-Si aluminum alloys are the most widely used materials in the field of metal additive manufacturing, and are used in the manufacture of metal structural parts in aerospace, medical, machinery and other fields. However, due to the large stress, poor plasticity and toughness of the aluminum alloy components manufactured by additive materials, they cannot be used directly. The residual stress inside the material must be eliminated by heat treatment, and the shape and distribution of the secondary precipitated phase of the aluminum alloy matrix must be controlled. In order to improve the plasticity and toughness of parts, ...

AI Technical Summary

Problems solved by technology

However, the defects in the heat treatment method of the existing additive manufacturing Al-Si series aluminum alloy components are: 1) In order to retain the mechanical strength strengthening effect brought by the rapid solidification of the additive manufacturing Al-Si series aluminum alloy components to the greatest extent, use Although the lower annealing temperature inhibits the growth of the matrix Si phase, it also inhibits the recovery process of the aluminum alloy, so that the internal residual stress of the material is less eliminated, and the level of plasticity and toughness is low; 2) In order to obtain a better effect of stress relief, Using a higher annealing temperature causes the rapid growth of the Si phase in the material, thus losing the effect of the original precipitation phase dispersion strengthening, and greatly reducing the mechanical strength of the material.

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