Additive manufacturing method for ultra-fine grain material

Abstract

The invention relates to an additive manufacturing method for an ultra-fine grain material. The additive manufacturing method comprises the following steps that 1) a raw material is prepared, specifically, after aluminum-magnesium alloy powder and tungsten carbide powder are uniformly mixed in a volume ratio of 3-4: 1, vacuum drying is carried out to obtain cold spraying powder; (2) cold sprayingdeposition forming is carried out, and specifically, the cold spraying powder is cold-sprayed to the surface of a base body or the surface of a pre-deposition body to form a cold spraying deposition body, wherein the parameters of cold spraying are that the gas pressure is 0.6-0.8 MPa, the gas heating temperature is 350-380 DEG C, the powder feeding speed is 12-16 g / min, the spraying moving speedis 10 mm / s, and the spraying distance is 25 mm; and (3) stirring friction treatment is carried out, and specifically, a stirring head of a stirring friction machine conducts stirring friction treatment on the cold spraying deposition body to obtain the cold spraying deposition body with a uniform ultra-fine grain structure. The additive manufacturing method has the advantages of being simple in operation, low in temperature, high in deposition efficiency and density, capable of realizing preparation of aircraft parts with complex shapes, and suitable for industrial production of ultra-fine grain materials; and the prepared aircraft parts have a uniform ultrafine grain structure and excellent mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to an additive manufacturing method of ultrafine-grained materials. Background technique [0002] Ultrafine-grained materials refer to materials with at least one dimension in the submicron range (0.1 μm<d<1 μm) in three-dimensional space, and have excellent mechanical properties, especially high toughness and high strength. [0003] With the rapid development of modern industry and science, metal materials are required to have higher mechanical properties while maintaining the original imaging quality. The above functions can be achieved by refining the grains of ordinary steel to prepare ultra-fine grain metal materials, and then replace more expensive alloy materials. In the current context of resource shortages and increasingly serious environmental pollution, this technology reduces the consumption of expensive metals, improves material utiliza...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the technical problems existing in the prior art, the present invention provides an additive manufacturing method for ultra-fine-grained materials, which solves some deficiencies in the industrial production of existing ultra-fine-grained materials, such as the inability to realize complex-shaped aircrafts. Preparation of parts and other issues