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A kind of tial+ti 2 Method for preparing alnb composite material by laser melting deposition

A technology of laser melting deposition and composite materials, which is applied in the field of laser melting deposition preparation of TiAl+Ti2AlNb composite materials, can solve the problems of difficult release of stress, cracks, and difficulty in determining the plasticizing mechanism, so as to reduce thermal stress concentration, slow down the solidification speed and Cooling rate, effect of avoiding cracks

Active Publication Date: 2021-08-03
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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Problems solved by technology

[0003] However, with the laser melting deposition method, the cooling rate during the forming process is faster, and the stress is not easy to release, which causes crack defects (see figure 1 )
The crack defects in the sample formed by laser melting deposition have an impact on the subsequent microstructure and performance analysis, and it is impossible to measure its mechanical properties at room temperature. 2 Plasticizing Mechanism of AlNb on TiAl-Based Alloys

Method used

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  • A kind of tial+ti <sub>2</sub> Method for preparing alnb composite material by laser melting deposition
  • A kind of tial+ti <sub>2</sub> Method for preparing alnb composite material by laser melting deposition
  • A kind of tial+ti <sub>2</sub> Method for preparing alnb composite material by laser melting deposition

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[0022] The technical scheme of the present invention will be described in further detail below in conjunction with accompanying drawing and example:

[0023] (1) The experimental equipment is Arnold 6KW three-dimensional laser processing and manufacturing system, and the raw materials used for laser melting deposition forming are spherical TiAl and Ti 2 AlNb powder, the powder particle size is 53-106μm, using dual-channel coaxial powder feeding, so that TiAl powder and Ti 2 AlNb powder is mixed into the molten pool at a volume ratio of 7:3, that is, the volume ratio of the two powder feeding channels is adjusted to be 7:3.

[0024] (2) The scanning path of the forming process is a concentric arc from the outside to the inside. The overlap distance between the concentric arcs is 0.7mm, and the radial overlap between the concentric arcs is 0.7mm (about 43 %), and the lap length of each concentric arc at the opening is 0.7mm. In each layer, the opening direction of each concent...

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Abstract

The invention is the field of laser additive manufacturing technology, involving a TIAL+TI 2 Alnb composite material laser melting deposits preparation.The laser melting deposition method adopted by the present invention is used for TIAL+TI 2 The forming of alnb composite material is to adjust the TI 2 Alnb's additions make it play a "nail" role in composite material organizations, and increase the overall plasticity of the material.At the same time, select the forming circular sample, the scanning path is changed to the concentric arc, avoiding the stress of the straight line scanning path of the rectangular sample, and the opening of the concentric circle on each layer to 60 ° ‑90 °, that is, the starting point of the scan on each layer changes changes.Huan position, reduce thermal concentration, and avoid cracking.Control the thermal input volume in the forming process, and adjust the preheating temperature of the substrate during the formation process, slow down the coagulation and cooling speed of the metal metal, and make the stress more time release.

Description

technical field [0001] The invention belongs to the technical field of laser additive manufacturing and relates to a TiAl+Ti 2 A method for preparing AlNb composite materials by laser melting deposition. Background technique [0002] Laser melting deposition is a new type of additive manufacturing technology, which has great advantages in the fields of new materials, new structure development, complex structure manufacturing and load-bearing component repair, so it is widely used in aviation, aerospace and biology and other fields. The density of TiAl-based alloy is low, about 3.9g / cm 3 , its creep resistance and high-temperature oxidation resistance are far superior to high-temperature titanium alloys, comparable to nickel-based superalloys, and have high specific stiffness, specific strength and thermal conductivity. However, the low symmetry of the matrix γ-TiAl phase due to its directional strong bonding and deformation behavior based on the ordered structure also lead...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F10/25B22F1/00B33Y10/00B33Y70/00
CPCB33Y10/00B33Y70/00B22F10/00B22F1/065B22F10/362B22F10/36B22F10/322B22F10/25B22F10/366Y02P10/25
Inventor 张国会秦仁耀黄帅熊华平李能
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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