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A method for electron beam fuse deposition of ultrafine mesh structure titanium matrix composites

A titanium-based composite material and fuse deposition technology, which is applied in the direction of metal material coating technology, additive processing, and process efficiency improvement, can solve the problem of poor plasticity and toughness of particle-reinforced titanium-based composite materials, and the reinforcement phase is distributed in large particles. It is difficult to control the distribution of surrounding and reinforced phases, etc., to achieve the effects of inhibiting the growth of TiB, broadening the scope of preparation and application, and fine grains

Active Publication Date: 2020-08-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese Patent No. ZL201110352107.9ZL200810136852.8 discloses a patent titled a preparation method of an in-situ titanium-based composite material and parts, which uses laser melting deposition to prepare TiC and / or TiB-reinforced titanium-based composite materials, but Composite materials have low ductility and toughness
The reason is that on the one hand, the raw material required by the electron beam fuse deposition process is wire, and the particle-reinforced titanium-based composite material has poor plasticity and toughness, and it is difficult to process it into wire; on the other hand, the rapid solidification method is different from the powder metallurgy method, and cannot be first The reinforcement phase is distributed around the large particles, and then the network structure is obtained by sintering. This method is difficult to control the distribution of the reinforcement phase

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  • A method for electron beam fuse deposition of ultrafine mesh structure titanium matrix composites

Examples

Experimental program
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Embodiment 1

[0017] Using pure titanium as the wire material, first boronizing the wire material, the specific process parameters are: boron source BCl 3 , a boronizing temperature of 800° C., a voltage of 700 V, and a treatment time of 20 minutes to obtain a boronized titanium wire with a boron content of 0.2 wt.%. The above-mentioned boronized titanium wire is rapidly formed by electron beam fuse deposition technology. The specific process parameters are: fuse current 15mA, voltage 60kV, travel speed 200mm / min, wire feeding speed 2r / min, vacuum degree better than 5 ×10 -2 Pa. The microstructure characterization and performance test of the prepared composite material show that the interior is an ultra-fine network structure, the tensile strength is 1016MPa, and the elongation is 9.1%.

Embodiment 2

[0019] The difference between this example and Example 1 is that the wire material is TC4, and the boronizing treatment time is 50 minutes to obtain a boronized titanium wire with a boron content of 0.4 wt.%. Electron beam fuse deposition process parameters are: fuse current 18mA, voltage 60kV, travel speed 200mm / min, wire feeding speed 2r / min, vacuum degree better than 5×10 -2 Pa. The microstructure characterization and performance test of the prepared composite material show that the interior is an ultra-fine network structure, the tensile strength is 1027MPa, and the elongation is 7.9%.

Embodiment 3

[0021] The difference between this embodiment and Embodiment 1 is that the boronizing treatment time of the titanium wire is 80 minutes, and a boronized titanium wire with a boron content of 0.8 wt.% is obtained. Electron beam fuse deposition process parameters are: fuse current 22mA, voltage 60kV, travel speed 200mm / min, wire feeding speed 2r / min, vacuum degree better than 5×10 -2 Pa. The microstructure characterization and performance test of the prepared composite material show that the interior is an ultra-fine network structure, the tensile strength is 1033MPa, and the elongation is 7.1%.

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Abstract

The invention relates to a method for depositing an ultrafine mesh titanium-based composite material by an electron beam fuse, which comprises the following steps: firstly, boronizing the surface of the titanium alloy wire, and then using the electron beam fuse deposition technology to boronize the surface of the titanium alloy wire Titanium wire for rapid prototyping. The invention provides a method for depositing an ultra-fine mesh titanium-based composite material with an electron beam fuse, which breaks through the limitation that the wire material of the titanium-based composite material is difficult to process; at the same time, the distribution of the reinforcing phase inside the composite material after deposition of the electron beam fuse can be carried out. Effective control can prepare ultra-fine mesh structure titanium-based composite materials with high strength and toughness. In addition, the process has strong applicability and short process flow, which greatly broadens the preparation and application range of titanium-based composite materials.

Description

technical field [0001] The invention relates to the field of metal-based composite materials, in particular to a method for depositing ultra-fine net structure titanium-based composite materials by electron beam fuses. Background technique [0002] Lightweight, high-strength, high-stiffness discontinuously reinforced titanium matrix composites (DRTMCs) have become key candidate materials in the aerospace field. However, due to the presence of reinforcements, the high-temperature deformation resistance of composite materials is improved, and local plastic rheology is prone to occur during high-temperature deformation, which increases the difficulty of thermal deformation processing of titanium-based composites and severely limits the application range of titanium-based composites. [0003] Additive manufacturing method Additive manufacturing has the characteristics of rapidity, flexibility, and designability. It can directly obtain titanium-based composite products with match...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
CPCC23C8/68B33Y10/00B33Y70/00B22F10/00B22F10/25B22F10/36B22F10/38Y02P10/25
Inventor 姚正军陶学伟张莎莎刘莹莹胥栋衡
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS