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Forming method of TiAl in-situ composite structure

An in-situ composite, alloy powder technology, applied in the field of titanium-aluminum alloy forming, can solve the problems of poor plasticity and toughness of TiAl alloy

Pending Publication Date: 2022-06-24
BEIHANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of poor plasticity and toughness of TiAl alloy, and provide a forming method of TiAl in-situ composite structure, which uses powder bed additive manufacturing technology to prepare mold envelopes in situ and manufacture them in powder embryos through additive manufacturing. The method directly prepares the support skeleton, and then realizes the densified metal composite structure powder forming by hot isostatic pressing technology

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  • Forming method of TiAl in-situ composite structure
  • Forming method of TiAl in-situ composite structure
  • Forming method of TiAl in-situ composite structure

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Embodiment 1

[0052] like figure 1 As shown, in this embodiment, the forming method of the TiAl in-situ composite structure proposed by the present invention includes the following steps:

[0053] Step 1: Put the Ti-48Al-2Cr-2Nb alloy powder into the powder silo of the powder bed additive manufacturing equipment;

[0054] Step two, as figure 2 The 3D model of the rectangular closed mold package shown, such as image 3 The 3D model of the column frame shown is imported into the Arcam AB A2XX electron beam selective melting equipment control software; the cross section of the sheath is 16mm×16mm square, and the thickness of the sheath is 2mm; the width of the cross section of a single column frame is 0.6mm , the distance D between the skeleton structures is 3mm;

[0055] Step 3: Evacuate the forming chamber of the powder bed additive manufacturing equipment, so that the forming chamber forms a 1×10 -5 mbar vacuum negative pressure environment; use powder bed additive manufacturing equipm...

Embodiment 2

[0058] In this embodiment, the forming method of the TiAl in-situ composite structure proposed by the present invention includes the following steps:

[0059] Step 1, put the Ti-44.5Al-4.5Nb-1.0Mo-0.15B alloy powder into the powder bin of the powder bed additive manufacturing equipment;

[0060] Step two, as figure 2 The 3D model of the rectangular closed mold package shown, such as image 3 The 3D model of the grid skeleton shown is imported into the laser selective melting equipment control software; among them, the cross section of the envelope is 16mm×16mm square, the envelope thickness is 2mm; the width of the grid skeleton is 0.6mm, and the skeleton structure The distance D between them is 3mm;

[0061] Step 3: Evacuate the forming chamber of the powder bed additive manufacturing equipment, so that the forming chamber forms a 1×10 -3 mbar vacuum negative pressure environment; use powder bed additive manufacturing equipment to form the mold cover and support frame lay...

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Abstract

The invention discloses a forming method of a TiAl in-situ composite structure. The forming method comprises the following steps that TiAl alloy powder is placed in a powder bin of powder bed additive manufacturing equipment; designing a three-dimensional model of the mold sheath and the supporting framework, and importing the three-dimensional model into powder bed additive manufacturing equipment control software; a forming bin of the powder bed additive manufacturing equipment is vacuumized, and a vacuum negative pressure environment is formed; powder bed additive manufacturing equipment is used for forming a mold sheath and a supporting framework layer by layer in a forming bin; and the mold sheath is taken out of the powder bed and placed into hot isostatic pressing equipment, a pressure medium is injected into the mold sheath, heating is conducted, the mold sheath, the powder bed wrapped in the mold sheath and the supporting framework in the powder bed are densified in the high-temperature and high-pressure environment of the hot isostatic pressing equipment, and the TiAl alloy in-situ composite material is obtained. According to the method, a mold sheath and a supporting framework are prepared in situ through the powder bed additive manufacturing technology, densified metal composite structure powder forming is achieved through the hot isostatic pressing technology, and material mechanical property balance is achieved.

Description

technical field [0001] The invention relates to the technical field of titanium-aluminum alloy forming, in particular to a forming method of a TiAl in-situ composite structure. Background technique [0002] Titanium-aluminum-based intermetallic compounds, also known as titanium-aluminum alloys (TiAl alloys), have the advantages of low density, high specific strength, high specific stiffness, and excellent oxidation and creep resistance at high temperatures. Aerospace lightweight high temperature structural material. TiAl alloys have few activated slip systems at room temperature, and cross-slip is difficult to occur. The resulting brittleness and low plasticity are the main problems that limit the further application of TiAl alloys. The mechanical properties of TiAl alloys are closely related to the microstructure: the dual-mode structure has fine grains and thus has high elongation and tensile strength, but low fracture toughness and creep resistance; full lamellar structu...

Claims

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Application Information

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IPC IPC(8): B22F5/00B22F10/28B22F10/30B22F10/64B22F10/66C22C30/00B33Y10/00B33Y40/20B33Y80/00
CPCB22F10/28B22F10/64B22F10/66B22F5/00B22F10/30C22C14/00C22C30/00B33Y10/00B33Y40/20B33Y80/00
Inventor 彭徽高润奇梁永锋陈博郭洪波
Owner BEIHANG UNIV