Ti/Ti6Al4V composite with continuous gradient change of components and preparation method of Ti/Ti6Al4V composite
A gradient change, composite material technology, applied in the direction of additive manufacturing, additive processing, process efficiency improvement, etc., can solve the problems of intermetallic compounds, cracks, mutation components, etc.
Active Publication Date: 2018-12-07
CENT SOUTH UNIV
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Problems solved by technology
[0007] Aiming at the problems of intermetallic compounds, cracks and sudden changes in the preparation of gradient materials by existing laser powder deposition (additive manufacturing), the present invention designs a Ti / Ti6Al4V composite material with continuous gradient changes in components and its preparation method
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Embodiment 1
[0060] The pure Ti plate is used as the substrate, polished with 400-grit sandpaper to remove the surface oxide layer, and ultrasonically cleaned in alcohol for later use. The Ti6Al4V powder with a particle size of 45-75 μm was used as a raw material, and the powder was dried in a vacuum oven at 60° C. for 4 hours. Laser powder deposition equipment is used to prepare Ti / Ti6Al4V gradient structure materials. The laser power is set to 160W; the laser scanning speed is set to 550mm / s; the Ti6Al4V powder feeding volume is set to 0.88g / min; the protective gas flow rate is set to 9L / h. Under the conditions of the process parameters, the dilution rate is 73%. The elements of the prepared Ti / Ti6Al4V gradient composite material are distributed continuously, such as figure 2 ; With α-Ti as the only phase, such as image 3 ; The properties of the material such as hardness and elastic modulus change in a gradient, such as Figure 4 .
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Abstract
The invention relates to a Ti / Ti6Al4V composite with continuous gradient change of components and a preparation method of the Ti / Ti6Al4V composite. The composite comprises a base layer, a first gradient layer, a second gradient layer, ... and an Nth gradient layer; N is an integer which is greater than or equal to 2; the Nth gradient layer is attached to the (N-1)th gradient layer; the base layeris made from Ti; any gradient layer of the composite is composed of Ti, Al and V; and the Ti content in the (P-1)th gradient layer is greater than the Ti content in the Pth gradient layer. The preparation method of the Ti / Ti6Al4V composite comprises the steps that a Ti plate is used as a substrate; dry Ti6Al4V powder is used as a raw material; according to a set structure, all the gradient layersare sequentially prepared through a 3D printing technology; the composite is obtained; and the dilution rate is controlled to be higher than or equal to 30% in the 3D printing process. The composite is reasonable in structural design and simple in preparation technique, the obtained product has excellent performance, and the composite can be used for large-scale industrial application conveniently.
Description
technical field [0001] The invention belongs to the technical field of preparation of gradient materials, in particular to a method for preparing density gradient materials using 3D printing technology, and in particular to a Ti / Ti6Al4V composite material with continuous gradient changes in components and its preparation method. Background technique [0002] Titanium and titanium alloys have the characteristics of low density, good specific strength, and high modulus. They are usually made into structural parts and widely used in aerospace, automotive and other fields as load-bearing components. However, because the actual stress conditions of different parts of the same component are often different, traditional homogeneous materials cannot meet this requirement. However, the Ti / Ti6Al4V composite structure with gradient distribution of composition and microstructure provides a possible solution, because the structural components with gradient properties can be obtained by a...
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IPC IPC(8): B22F3/105C22C1/04C22C14/00
CPCC22C1/0458C22C14/00B33Y10/00B22F10/00B22F10/36B22F10/25B22F12/00Y02P10/25
Inventor 刘文胜刘阳马运柱梁超平刘超张诚
Owner CENT SOUTH UNIV