Titanium alloy material and preparation method thereof

Abstract

The invention provides a titanium alloy material and a preparation method thereof, and belongs to the technical field of titanium alloy preparation. The preparation method of the titanium alloy material comprises the steps that titanium alloy powder is subjected to 3D printing, after 3D printing is completed, a product obtained through 3D printing is cooled, and the titanium alloy material is obtained; the mass content of carbides in the titanium alloy powder is 0.05 to 0.2 percent; the carbide comprises SiC and / or TiC; the matrix in the titanium alloy powder is TC4 titanium alloy; according to the technological parameters of 3D printing, the laser power ranges from 60 W to 360 W, the laser scanning speed ranges from 600 mm / s to 800 mm / s, the scanning distance ranges from 0.06 mm, the powder layer thickness ranges from 0.04 mm to 0.06 mm, and the energy density ranges from 25 J / mm < 3 > to 200 J / mm < 3 >. The carbide is added into the matrix, and the titanium alloy material is formed under an adaptive 3D printing process, so that the titanium alloy material has high strength and good plasticity.

Description

Technical Field

[0001] This invention belongs to the field of titanium alloy preparation technology, specifically relating to a titanium alloy material and its preparation method. Background Technology

[0002] Currently, TC4 titanium alloy is widely used due to its excellent room-temperature strength and ductility, making it a popular choice for 3D printing. However, with technological advancements increasing the demands on the operating temperature of titanium alloys, the high-temperature performance of traditional TC4 titanium alloys is insufficient to meet current requirements. Therefore, to improve the high-temperature strength and operating temperature of TC4 titanium alloys, SiC or TiC needs to be added. These form high-temperature resistant hard particles in the matrix, enhancing the high-temperature strength of the matrix. However, excessive precipitation of hard particles leads to a decrease in the material's room-temperature ductility. Therefore, how to improve titanium alloy materials to enhance room-temperature ductility while maintaining room-temperature strength has become a pressing technical challenge in this field. Summary of the Invention

[0003] The purpose of this invention is to provide a titanium alloy material and a method for preparing the same. The titanium alloy material prepared by the method provided by this invention exhibits excellent strength and ductility at room temperature.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solution: This invention provides a method for preparing titanium alloy material, which involves: 3D printing titanium alloy powder; after 3D printing is completed, cooling the 3D printed product to obtain titanium alloy material. The titanium alloy powder contains 0.05-0.2% carbide by mass; the carbides include SiC and / or TiC; the matrix of the titanium alloy powder is TC4 titanium alloy. The 3D printing process parameters include: laser power 60~360W, laser scanning speed 600~800mm / s, scanning distance 0.06mm, powder layer thickness 0.04~0.06mm, and energy density 25~200J / mm². 3 .

[0005] Preferably, the mass content of carbides in the titanium alloy powder is 0.1%.

[0006] Preferably, the laser power is 90~270W.

[0007] Preferably, the laser power is 180~200W.

[0008] Preferably, the laser scanning speed is 700~800mm / s.

[0009] Preferably, the thickness of the powder layer is 0.05 mm.

[0010] Preferably, the energy density is 33.3~150 J / mm². 3 .

[0011] Preferably, the energy density is 37.5~100 J / mm². 3 .

[0012] The present invention also provides titanium alloy materials prepared by the preparation method described in the above technical solution.

[0013] This invention provides a method for preparing titanium alloy materials, comprising: 3D printing titanium alloy powder; after 3D printing, cooling the 3D-printed product to obtain the titanium alloy material; the mass content of carbides in the titanium alloy powder is 0.05~0.2%; the carbides include SiC and / or TiC; the matrix in the titanium alloy powder is TC4 titanium alloy; the 3D printing process parameters include: laser power 60~360W, laser scanning speed 600~800mm / s, scanning distance 0.06mm, powder layer thickness 0.04~0.06mm, and energy density 25~200J / mm². 3 This invention involves adding SiC and / or TiC to a titanium alloy matrix, followed by molding using a suitable 3D printing process to form an interleaved martensitic structure. This results in a titanium alloy material exhibiting high strength and good ductility at room temperature. Examples show that the titanium alloy material prepared by the method provided in this invention has a room temperature tensile strength as high as 1243.96 MPa and an elongation of 14%. Attached Figure Description

[0014] Figure 1 XRD patterns of the titanium alloy materials prepared in Examples 1-7; Figure 2 The tensile stress-strain curves of the titanium alloy materials prepared in Examples 1-7 are shown. Figure 3 The ultimate tensile strength and elongation of the titanium alloy materials prepared in Examples 1-7 are shown. Detailed Implementation

[0015] This invention provides a method for preparing titanium alloy material, which involves: 3D printing titanium alloy powder; after 3D printing is completed, cooling the 3D printed product to obtain titanium alloy material. The titanium alloy powder contains 0.05-0.2% carbide by mass; the carbides include SiC and / or TiC; the matrix of the titanium alloy powder is TC4 titanium alloy. The 3D printing process parameters include: laser power 60~360W, laser scanning speed 600~800mm / s, scanning distance 0.06mm, powder layer thickness 0.04~0.06mm, and energy density 25~200J / mm². 3 .

[0016] This invention does not impose any special restrictions on the source of the raw materials; commercially available products familiar to those skilled in the art can be used.

[0017] In this invention, the carbide content in the titanium alloy powder is 0.05~0.2%, preferably 0.1%; the carbides include SiC and / or TiC. Limiting the carbide content within the above range further improves the mechanical properties of the titanium alloy material.

[0018] In this invention, when the carbides are SiC and TiC, the mass ratio of SiC to TiC is preferably 1:1.

[0019] In this invention, the matrix of the titanium alloy powder is TC4 titanium alloy.

[0020] In this invention, the particle size of the titanium alloy powder is preferably 15~45μm. This invention does not impose any special limitations on the preparation method of the titanium alloy powder, as long as the required particle size is met.

[0021] In this invention, the 3D printing process parameters include: laser power 60~360W, laser scanning speed 600~800mm / s, scanning distance (h) 0.06mm, powder layer thickness 0.04~0.06mm, and energy density 25~200J / mm². 3 This invention limits the 3D printing process parameters to the above-mentioned range, which can further improve the strength and plasticity of titanium alloy materials.

[0022] In one implementation, the laser power (P) can be 90W, 100W, 150W, 180W, 200W, 250W, 270W, 300W, or 350W.

[0023] In one implementation, the laser scanning speed (V) can be 650 mm / s, 700 mm / s, or 750 mm / s.

[0024] In one embodiment, the thickness (t) of the powder layer can be 0.05 mm.

[0025] As one implementation, the energy density (E=P / Vht) can be 30 J / mm². 3 33.3J / mm 3 37.5J / mm3 50J / mm 3 75J / mm 3 100J / mm 3 125J / mm 3 150J / mm 3 Or 175J / mm 3 .

[0026] The present invention does not impose any special limitations on the cooling operation; any operation known to those skilled in the art can be used.

[0027] The present invention adds SiC and / or TiC to a titanium alloy matrix, and then forms an interleaved martensitic structure under a suitable 3D printing process, so that the titanium alloy material exhibits high strength and good plasticity at room temperature.

[0028] This invention significantly improves the room temperature strength of titanium alloys while maintaining excellent plasticity by adding SiC and / or TiC, solving the problem of high strength but low plasticity in traditional titanium alloys at room temperature. Currently, the room temperature tensile strength of cast and forged TC4 titanium alloys is around 1000 MPa, and the elongation is around 10%. The preparation method provided by this invention yields a TC4 titanium alloy with a room temperature tensile strength as high as 1243.96 MPa and an elongation of 14%, achieving a simultaneous improvement in strength and plasticity.

[0029] The technical solutions of this invention will be clearly and completely described below with reference to examples. Obviously, the described examples are only a part of the examples of this invention, and not all of them. All other examples obtained by those skilled in the art based on the examples of this invention without inventive effort are within the scope of protection of this invention.

[0030] Example 1 A method for preparing a titanium alloy material is as follows: Titanium alloy powder is 3D printed and then cooled to obtain titanium alloy material; The particle size of the titanium alloy powder is 15~45μm; The titanium alloy powder contains 0.1% by mass of carbides, namely SiC and TiC, in a mass ratio of 1:1. The matrix in the titanium alloy material is TC4; The 3D printing process parameters are as follows: laser power 60W, laser scanning speed 800mm / s, scanning distance 0.06mm, powder layer thickness 0.05mm, and energy density 25J / mm². 3 .

[0031] Example 2 Based on Example 1, the laser power was changed to 90W and the energy density was changed to 37.5J / mm². 3 All other conditions remain unchanged.

[0032] Example 3 Based on Example 1, the laser scanning speed was changed to 600 mm / s, and the energy density was changed to 33.3 J / mm. 3 All other conditions remain unchanged.

[0033] Example 4 Based on Example 1, the laser scanning speed was changed to 600 mm / s, the laser power to 90 W, and the energy density to 50 J / mm². 3 All other conditions remain unchanged.

[0034] Example 5 Based on Example 1, the laser scanning speed was changed to 600 mm / s, the laser power to 180 W, and the energy density to 100 J / mm². 3 All other conditions remain unchanged.

[0035] Example 6 Based on Example 1, the laser scanning speed was changed to 600 mm / s, the laser power to 270 W, and the energy density to 150 J / mm². 3 All other conditions remain unchanged.

[0036] Example 7 Based on Example 1, the laser scanning speed was changed to 600 mm / s, the laser power to 360 W, and the energy density to 200 J / mm². 3 All other conditions remain unchanged.

[0037] The XRD patterns of the titanium alloy materials prepared in Examples 1-7 are as follows: Figure 1 As shown.

[0038] from Figure 1 It can be seen that the diffraction peaks of the titanium alloy materials prepared by the seven processes are all dominated by α-Ti, while the diffraction peaks of β-Ti, which is also a titanium matrix phase, are relatively few; among them, only the diffraction peaks of the titanium matrix are more obvious at low energy density.

[0039] The room temperature mechanical properties of the titanium alloy materials prepared in Examples 1-7 were tested, and the results are as follows: Figure 2 and 3 As shown; at room temperature, a uniaxial tensile test was performed on the sample perpendicular to the deposition direction according to the GB / T228.1-2010 standard.

[0040] Figure 2 The tensile stress-strain curves of the titanium alloy materials prepared in Examples 1-7 are shown. Figure 3The ultimate tensile strength and elongation of the titanium alloy materials prepared in Examples 1-7 are shown.

[0041] from Figures 2-3 It can be seen that when the energy density increases from 25 J / mm², 3 Increased to 50J / mm 3 At that time, the comprehensive mechanical properties of the material showed a gradual increasing trend, with an energy density of 50 J / mm². 3 At this optimal point, the sample exhibits the best overall performance: the formed sample has high density and an ideally proportioned and uniformly distributed biphase microstructure. This microstructure directly promotes the synergistic improvement of strength and ductility, while the reinforcing phase is also uniformly distributed, resulting in a yield strength of 1243.96 MPa. However, when the energy density is lower than this optimal process window, insufficient energy input leads to a significant deterioration in sample density, accompanied by defects such as incomplete fusion, resulting in lower strength and plasticity. If the energy density is further increased, the increase in porosity and residual stress will limit further improvement in material properties. When the energy density increases from 50 J / mm², the sample exhibits the best overall performance. 3 Increased to 200J / mm 3 At this time, the overall mechanical properties show a downward trend, and the increase in porosity and residual stress caused by excessively high energy density will limit the improvement of the tensile properties of composite materials.

[0042] As can be seen from the above examples, the titanium alloy material provided by the present invention has excellent strength and plasticity.

[0043] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing a titanium alloy material, characterized in that, The process involves 3D printing titanium alloy powder, and after the 3D printing is completed, cooling the 3D printed product to obtain titanium alloy material. The titanium alloy powder contains 0.05-0.2% carbide by mass; the carbides include SiC and / or TiC; the matrix of the titanium alloy powder is TC4 titanium alloy. The 3D printing process parameters include: laser power 60~360W, laser scanning speed 600~800mm / s, scanning distance 0.06mm, powder layer thickness 0.04~0.06mm, and energy density 25~200J / mm². 3 .

2. The preparation method according to claim 1, characterized in that, The mass content of carbides in the titanium alloy powder is 0.1%.

3. The preparation method according to claim 1, characterized in that, The laser power is 90~270W.

4. The preparation method according to claim 1 or 3, characterized in that, The laser power is 180~200W.

5. The preparation method according to claim 1, characterized in that, The laser scanning speed is 700~800mm / s.

6. The preparation method according to claim 1, characterized in that, The thickness of the powder layer is 0.05 mm.

7. The preparation method according to claim 1, characterized in that, The energy density is 33.3~150 J / mm². 3 .

8. The preparation method according to claim 1 or 7, characterized in that, The energy density is 37.5~100 J / mm². 3 .

9. The titanium alloy material prepared by the preparation method according to any one of claims 1 to 8.

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