Method for utilizing boron alloying metamorphism to reduce anisotropy of TC4 additive manufacturing

An anisotropic, additive manufacturing technology, applied in the directions of additive manufacturing, additive processing, and process efficiency improvement, can solve the problems of difficult part processing technology, large temperature gradient, poor thermal conductivity, etc., to suppress coarse primary columnar crystals. Growth, increased plasticity and toughness, reduced anisotropy effects

Inactive Publication Date: 2019-01-18
XI AN JIAOTONG UNIV
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AI Technical Summary

Problems solved by technology

[0002] Laser additive manufacturing of titanium alloys is an emerging technology developed in recent years. This technology melts synchronously transported titanium alloy powder through high-power lasers, and accumulates formed parts point by point, which overcomes the high melting point of titanium alloy itself. , poor thermal conductivity, high molten state activity, and large deformation resistance, the disadvantages of difficult processing and complex parts processing technology have been more and more researched and applied in the field of aerospace and defense manufacturing. However, due to Laser additive manufacturing has the characteristics of instant heating and cooling, and large temperature gradient, which is difficult to control, resulting in the macrostructure of its titanium alloy forming parts being coarse β columnar crystals penetrating through multiple cladding layers along the forming direction, resulting in anisotropy of titanium alloy components. (can reach 15%-70%) Obviously, the fracture toughness and low cycle fatigue strength are low, which seriously restricts its application in the defense industry and aerospace fields

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  • Method for utilizing boron alloying metamorphism to reduce anisotropy of TC4 additive manufacturing
  • Method for utilizing boron alloying metamorphism to reduce anisotropy of TC4 additive manufacturing
  • Method for utilizing boron alloying metamorphism to reduce anisotropy of TC4 additive manufacturing

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Embodiment 1

[0024] In process A, take TC4 titanium alloy powder with a particle size of 50-150 μm, and dry it in a vacuum at 120°C for 8 hours; then use a laser additive manufacturing device to perform laser cladding forming under an argon protective atmosphere. The laser power is 180W, the laser spot diameter is 0.5mm, the scanning speed is 10mm / s, the powder feeding amount is 2.5g / min, the Z-axis lifting amount △Z=0.10mm, and the scanning distance is 0.2mm. Then, the formed parts are subjected to solution aging heat treatment under the protection of inert gas argon, the solution temperature is 950°C, heat preservation for 1h, and air cooling; the aging temperature is 550°C, heat preservation for 4h, and then air cooling. The horizontal and vertical tensile properties of the room temperature of the formed alloy are shown in Table 1, and the metallographic diagram of the obtained sample is shown in Table 1. figure 1 As shown in -a, the structure is dominated by short rod-shaped columnar c...

Embodiment 2

[0026] B process, take the alloyed Ti-6Al-4V-0.05B ​​powder, wherein the mass fraction of boron element is 0.05%, the particle size of the alloy powder is 50-150 μm, and dry at 120 ℃ for 8 hours in vacuum; then use The laser additive manufacturing device performs laser cladding forming under an argon protective atmosphere. The laser power is 180W, the laser spot diameter is 0.5mm, the filling speed is 10mm / s, the powder feeding amount is 2.5g / min, the Z-axis lifting amount △Z=0.10mm, and the scanning distance is 0.2mm. Then, the formed parts are subjected to solution aging heat treatment under the protection of inert gas argon, the solution temperature is 950°C, heat preservation for 1h, and air cooling; the aging temperature is 550°C, heat preservation for 4h, and then air cooling. The horizontal and vertical tensile properties of the room temperature of the formed alloy are shown in Table 1, and the metallographic diagram of the obtained sample is shown in Table 1. figure 1...

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Abstract

The invention discloses a method for utilizing boron alloying metamorphism to reduce anisotropy of TC4 additive manufacturing. The method includes the following steps of S1, drying Ti-6Al-4V-0.05B alloy powder under a vacuum environment at 120 DEG C for 8 hours; S2, using a laser additive manufacturing device for conducting laser melting, covering and forming on the alloy powder dried in step S1 under a protective atmosphere of inert gas to obtain a formed sample component; S3, conducting thermal dissolution and aging treatment on the formed component under argon protection of the inert gas. By using a new material obtained by alloying boron and TC4 in the method for laser melting, covering and sedimentation, boron effectively inhibits generation of thick preliminary cylindrical crystals in a TC4 titanium alloy during forming and facilitates isometry and refining of TC4 titanium alloy grains, the structure is more uniform, and the anisotropy of conventional mechanical performance is controlled within 10%. A new approach is provided for laser additive manufacturing of the TC4 titanium alloy.

Description

technical field [0001] The invention belongs to the field of laser additive manufacturing; in particular, it relates to a method for reducing the anisotropy of TC4 titanium alloy laser additive manufacturing through boron alloying and modification. Background technique [0002] Laser additive manufacturing of titanium alloys is an emerging technology developed in recent years. This technology melts synchronously transported titanium alloy powder through high-power lasers, and accumulates formed parts point by point, which overcomes the high melting point of titanium alloy itself. , poor thermal conductivity, high molten state activity, and large deformation resistance, the disadvantages of difficult processing and complex parts processing technology have been more and more researched and applied in the field of aerospace and defense manufacturing. However, due to Laser additive manufacturing has the characteristics of instant heating and cooling, and large temperature gradie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/105B22F3/24C22F1/18C22C14/00B33Y70/00
CPCB22F1/0003C22C14/00C22F1/183B22F3/24B33Y70/00B22F2003/248B22F10/00B22F10/38B22F10/25B22F10/34B22F10/366B22F10/64B22F10/36B22F10/32Y02P10/25
Inventor 张安峰李涤尘霍浩张金智张晓星刘亚雄
Owner XI AN JIAOTONG UNIV
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