Additive manufacturing method for multi-material heterogeneous part

Abstract

The invention discloses an additive manufacturing method for a multi-material heterogeneous part. The additive manufacturing method for the multi-material heterogeneous part comprises the following steps that A, alloy powder is formed into forming layers through electron beam or laser selective melting, and the alloy powder comprises at least two elements, the elements are different in saturated vapor pressure and in volatilization degree; in the electron beam or laser selective melting process, different kinds of electron beam or laser energy are applied to different areas of each forming layer and / or the different forming layers, and the elements contained in the alloy powder are volatilized at the different degrees so that alloy with the different element contents can be obtained in the different areas and / or on the different forming layers; and B, the multiple forming layers and the different areas of the forming layers are subjected to fusion and stacking layer by layer, and finally the heterogeneous gradient part with the element component being in a three-dimensional change mode is obtained. The additive manufacturing method has the advantages of being simple in process, convenient to carry out, low in implementing cost and equipment requirement and the like.

Description

technical field [0001] The invention relates to the additive manufacturing of multi-material heterogeneous parts. Background technique [0002] Additive manufacturing technology is based on the principle of "discrete-stacking", and realizes the preparation of three-dimensional solid parts by adding materials layer by layer. This technology has the characteristics of short production cycle, high material utilization rate, and suitable for personalized production. At present, additive manufacturing technology can be divided into powder-feeding cladding deposition technology and powder-bed selective melting technology according to different material delivery methods. [0003] The preparation of multi-material heterogeneous parts with three-dimensional changes in material composition or microstructure is an important feature and development direction of additive manufacturing technology. [0004] Among them, the powder-feeding cladding deposition technology is based on laser or...

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Problems solved by technology

[0005] However, the powder bed selective melting technology is not easy to change the composition of the powder in the same layer, so it is difficult to prepare multi-material heterogeneous parts with three-dimensional composition changes.

[0006] However, whether it is a powder-feeding cladding deposition technology or a powder-bed selective melting technology, in order to prepare multi-material heterogeneous parts, at least two materials (powder or wire) with different compositions are required to be deposited in different areas. and fusion, it is not yet possible to use a single material (powder or wire) to prepare heterogeneous multi-material parts

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