CN112247156A - Titanium alloy powder of endogenous nano TiC particles and preparation method and application thereof - Google Patents
Titanium alloy powder of endogenous nano TiC particles and preparation method and application thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/10—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying using centrifugal force
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
- B33Y70/10—Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0848—Melting process before atomisation
Abstract
The invention is suitable for the technical field of additive manufacturing materials, and provides titanium alloy powder of endogenous nano TiC particles, a preparation method and application thereof, wherein the preparation method of the titanium alloy powder comprises the following steps: putting the titanium-based master alloy into a vacuum environment for smelting to obtain a molten alloy; adding an aluminum-based intermediate alloy containing nano TiC into the molten alloy, homogenizing, and then casting to obtain a casting blank; and preparing the casting blank into powder by using a plasma rotary electrode atomization method or a gas atomization method, and screening to obtain the nano TiC particle reinforced titanium alloy powder. According to the invention, the nano TiC is added into the titanium-based master alloy, so that the isometric crystal proportion of the part manufactured by additive manufacturing of the titanium alloy powder can be obviously improved, columnar crystals are reduced, the tissue uniformity of the part manufactured by additive manufacturing is greatly improved, the anisotropy phenomenon can be avoided, the crack forming tendency is reduced, and the strength and the plasticity of the metal product manufactured by additive manufacturing are improved.
Description
Technical Field
The invention belongs to the technical field of additive manufacturing materials, and particularly relates to titanium alloy powder of endogenous nano TiC particles, and a preparation method and application thereof.
Background
Titanium alloy has characteristics such as high specific strength, corrosion resistance and good biocompatibility, and titanium alloy is increasingly important in various fields such as biomedicine, aerospace and automobile industry and other professional applications. At present, titanium alloy products are complex in structure, multiple in variety, small in batch and high in performance requirement, and the traditional casting manufacturing technology cannot meet the requirements of the products. However, the additive manufacturing technology can meet the requirements of the manufacturing technology and the performance of titanium alloy products, and therefore, the additive manufacturing technology is widely applied. The development basis of the additive manufacturing technology is a high-energy thermal cladding technology and a rapid forming technology, compared with the traditional manufacturing technology, the processing time is greatly shortened without cutting of various cutters and processing of various complicated procedures, and meanwhile, the processing process and the manufacturing precision of parts with complex structures are higher.
Laser 3D printing is one of the mainstream additive manufacturing technologies at present, and can realize the rapid molding of complex parts. Meanwhile, the powder feeding type laser 3D printing technology can also realize the rapid repair of worn parts, and has wide application prospect in the fields of aerospace and biomedical science. A great deal of research in metal additive manufacturing techniques in recent years has shown that, in the production of titanium alloy metal parts, it is inevitable that coarse columnar crystals form. The existence of the columnar grain structure causes anisotropy of mechanical properties, the anisotropy causes serious crack tendency and reduced reliability of parts, and the problem of 'neck' in additive manufacturing popularization and application is solved. The formation of columnar crystals depends on the kinetic factors that drive nucleation and growth. In current commercial production, one way to promote columnar crystal to isometric transformation is to select appropriate process parameters in the 3D printing to affect the temperature gradient, solid-liquid interface growth rate, and cooling rate to promote the equiaxed columnar crystal transformation. As compared to continuous laser additive manufacturing, pulsed laser processing modes are more favorable for obtaining equiaxed grains, but still do not completely eliminate columnar grains; another approach is to increase the heterogeneous nucleation point and promote the transformation of columnar crystal to equiaxed crystal by controlling the composition of the alloy powder during 3D printing, but the columnar crystal is not completely eliminated in commercial production.
We find that adding nano TiC particles capable of serving as heterogeneous nucleation cores when the titanium alloy is solidified into the titanium alloy achieves unexpected effects in the process of transformation of columnar crystal orientation equiaxed crystals and achieves the achievement of complete equiaxed crystals.
Disclosure of Invention
The embodiment of the invention aims to provide a method for preparing titanium alloy powder of endogenous nano TiC particles, and aims to solve the problems in the background technology.
The embodiment of the invention is realized in such a way that a method for preparing titanium alloy powder of endogenous nano TiC particles comprises the following steps:
putting the titanium-based master alloy into a vacuum environment for smelting to obtain a molten alloy;
adding an aluminum-based intermediate alloy containing nano TiC into the molten alloy, homogenizing, and then casting to obtain a casting blank;
and preparing the casting blank into powder by using a plasma rotary electrode atomization method or a gas atomization method, and then screening to obtain the titanium alloy powder.
As a preferable scheme of the embodiment of the invention, in the step, the smelting temperature is 1700-1750 ℃.
As another preferable mode of the embodiment of the present invention, the titanium-based master alloy is a Ti-6Al-4V alloy.
As another preferable scheme of the embodiment of the present invention, the casting blank includes Al, V, Ti, and TiC, where the mass fraction of Al is 5.5% to 6.8%, the mass fraction of V is 3.5% to 4.5%, the mass fraction of Ti is 88.4% to 90.99%, and the mass fraction of TiC is 0.01% to 0.3%.
In another preferable embodiment of the present invention, in the cast slab, the mass fraction of Al is 6% to 6.5%, the mass fraction of V is 3.6% to 4%, and the mass fraction of Ti is 89.3% to 90.35%.
As another preferable scheme of the embodiment of the present invention, the preparation method of the aluminum-based intermediate alloy containing nano TiC includes the following steps:
ball-milling and mixing the carbon nano tube, the aluminum powder and the titanium powder to obtain alloy powder;
and (3) after the alloy powder is pressed and formed, burning and synthesizing the alloy powder at the temperature of 900-950 ℃ to obtain the aluminum-based intermediate alloy containing the nano TiC.
In another preferable embodiment of the present invention, in the alloy powder, a molar ratio of the carbon nanotubes to the titanium powder is 1:1, and a total mass fraction of the carbon nanotubes to the titanium powder is 20% to 40%.
Another object of the embodiments of the present invention is to provide a titanium alloy powder prepared by the above preparation method.
As another preferable scheme of the embodiment of the present invention, a titanium alloy structure obtained by performing selective laser melting or electron beam melting on the titanium alloy powder is an isometric crystal structure.
Another object of an embodiment of the present invention is to provide an application of the titanium alloy powder in additive manufacturing.
According to the preparation method of the titanium alloy powder with the endogenous nano TiC particles, provided by the embodiment of the invention, the nano TiC particles are added into the titanium-based master alloy, so that the isometric crystal proportion of the titanium alloy powder after additive manufacturing can be obviously improved, the columnar crystals are reduced, the uniformity of the structure after additive manufacturing is greatly improved, the anisotropy phenomenon can be avoided, the crack forming tendency can be reduced, and the strength and the plasticity of an additive manufactured metal product are improved.
Drawings
FIG. 1 is a structural diagram of a titanium alloy obtained by selective laser melting of the titanium alloy powder prepared in comparative example 1.
FIG. 2 is a structural diagram of a titanium alloy obtained by selective laser melting of the titanium alloy powder prepared in example 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The embodiment provides titanium alloy powder, and the preparation method comprises the following steps:
s1, mixing the carbon nano tube and titanium powder with the particle size of 300 meshes according to the molar ratio of 1:1 to obtain a mixture; then, the mixture and aluminum powder with the particle size of 500 meshes are placed in a ball mill according to the mass ratio of 30:70 and mixed for 24 hours at the speed of 50 revolutions per minute, and alloy powder is obtained.
S2, placing the alloy powder in an aluminum foil, pressing into a cylindrical pressing block with the diameter of 25mm and the height of 35mm, then placing the pressing block into a graphite mold, placing the graphite mold into a vacuum heating furnace, heating to 930 ℃ at the heating speed of 30 ℃/min for combustion synthesis, carrying out heat preservation treatment for 10min, and cooling to room temperature along with the furnace to obtain the aluminum-based intermediate alloy containing nano TiC, wherein the grain size of the nano TiC is 60-120 nm.
S3, weighing aluminum, vanadium, titanium and the obtained aluminum-based intermediate alloy containing nano TiC, and controlling the dosage of the aluminum-based intermediate alloy to ensure that the mass percent of Al is 6.1%, the mass percent of V is 3.66%, the mass percent of Ti is 90.04% and the mass percent of nano TiC is 0.2% in the system.
S4, mixing the weighed aluminum, vanadium and titanium, and heating to 1700 ℃ in a vacuum environment to smelt to obtain the molten alloy.
And S5, adding the weighed aluminum-based intermediate alloy containing the nano TiC into the molten alloy, homogenizing for 10min, and pouring into a cylindrical graphite mold for molding to obtain a casting blank.
S6, preparing the casting blank into powder by using a plasma rotary electrode atomization method in the prior art, and then carrying out mechanical vibration screening to obtain the titanium alloy powder. Wherein the sieved titanium alloy powder with the particle size of 15-53 mu m can be used as a selective laser melting material; the sieved 50-100 μm titanium alloy powder can be used as an electron beam melting material.
Example 2
The embodiment provides titanium alloy powder, and the preparation method comprises the following steps:
s1, mixing the carbon nano tube and titanium powder with the particle size of 300 meshes according to the molar ratio of 1:1 to obtain a mixture; then, the mixture and aluminum powder with the particle size of 500 meshes are placed in a ball mill according to the mass ratio of 30:70 and mixed for 24 hours at the speed of 50 revolutions per minute, and alloy powder is obtained.
S2, placing the alloy powder in an aluminum foil, pressing into a cylindrical pressing block with the diameter of 25mm and the height of 35mm, then placing the pressing block into a graphite mold, placing the graphite mold into a vacuum heating furnace, heating to 930 ℃ at the heating speed of 30 ℃/min for combustion synthesis, keeping the temperature for 10min, and cooling to room temperature along with the furnace to obtain the aluminum-based intermediate alloy containing nano TiC, wherein the grain size of the nano TiC is 60-120 nm.
S3, weighing aluminum, vanadium, titanium and the obtained aluminum-based intermediate alloy containing nano TiC, and controlling the dosage of the aluminum-based intermediate alloy to ensure that the mass percent of Al is 6.1%, the mass percent of V is 3.66%, the mass percent of Ti is 90.14% and the mass percent of nano TiC is 0.1% in the system.
S4, mixing the weighed aluminum, vanadium and titanium, and heating to 1700 ℃ in a vacuum environment to smelt to obtain the molten alloy.
And S5, adding the weighed aluminum-based intermediate alloy containing the nano TiC into the molten alloy, homogenizing for 10min, and pouring into a cylindrical graphite mold for molding to obtain a casting blank.
S6, preparing the casting blank into powder by using a plasma rotary electrode atomization method in the prior art, and then carrying out mechanical vibration screening to obtain the titanium alloy powder. Wherein the sieved titanium alloy powder with the particle size of 15-53 mu m can be used as a selective laser melting material; the sieved 50-100 μm titanium alloy powder can be used as an electron beam melting material.
Example 3
The embodiment provides titanium alloy powder, and the preparation method comprises the following steps:
s1, mixing the carbon nano tube and titanium powder with the particle size of 300 meshes according to the molar ratio of 1:1 to obtain a mixture; then, the mixture and aluminum powder with the particle size of 500 meshes are placed in a ball mill according to the mass ratio of 30:70 and mixed for 24 hours at the speed of 50 revolutions per minute, and alloy powder is obtained.
S2, placing the alloy powder in an aluminum foil, pressing into a cylindrical pressing block with the diameter of 25mm and the height of 35mm, then placing the pressing block into a graphite mold, placing the graphite mold into a vacuum heating furnace, heating to 930 ℃ at the heating speed of 30 ℃/min for combustion synthesis, keeping the temperature for 10min, and cooling to room temperature along with the furnace to obtain the aluminum-based intermediate alloy containing nano TiC, wherein the grain size of the nano TiC is 60-120 nm.
S3, weighing aluminum, vanadium, titanium and the obtained aluminum-based intermediate alloy containing nano TiC, and controlling the dosage of the aluminum-based intermediate alloy to ensure that the mass percent of Al is 6.1%, the mass percent of V is 3.66%, the mass percent of Ti is 89.94% and the mass percent of nano TiC is 0.3% in the system.
S4, mixing the weighed aluminum, vanadium and titanium, and heating to 1700 ℃ in a vacuum environment to smelt to obtain the molten alloy.
And S5, adding the weighed aluminum-based intermediate alloy containing the nano TiC into the molten alloy, homogenizing for 10min, and pouring into a cylindrical graphite mold for molding to obtain a casting blank.
S6, preparing the casting blank into powder by using a plasma rotary electrode atomization method in the prior art, and then carrying out mechanical vibration screening to obtain the titanium alloy powder. Wherein the sieved titanium alloy powder with the particle size of 15-53 mu m can be used as a selective laser melting material; the sieved 50-100 μm titanium alloy powder can be used as an electron beam melting material.
Example 4
The embodiment provides titanium alloy powder, and the preparation method comprises the following steps:
s1, mixing the carbon nano tube and titanium powder with the particle size of 300 meshes according to the molar ratio of 1:1 to obtain a mixture; then, the mixture and aluminum powder with the particle size of 500 meshes are placed in a ball mill according to the mass ratio of 20:80 and mixed for 24 hours at the speed of 50 revolutions per minute, and alloy powder is obtained.
S2, placing the alloy powder in an aluminum foil, pressing into a cylindrical pressing block with the diameter of 25mm and the height of 35mm, then placing the pressing block into a graphite mold, placing the graphite mold into a vacuum heating furnace, heating to 900 ℃ at the heating speed of 30 ℃/min for combustion synthesis, preserving heat for 10min, treating for 10min, and cooling to room temperature along with the furnace to obtain the aluminum-based intermediate alloy containing nano TiC.
S3, weighing aluminum, vanadium, titanium and the obtained aluminum-based intermediate alloy containing nano TiC, and controlling the dosage of the aluminum-based intermediate alloy to ensure that the mass percent of Al is 5.5%, the mass percent of V is 3.5%, the mass percent of Ti is 90.99% and the mass percent of nano TiC is 0.01% in the system.
S4, mixing the weighed aluminum, vanadium and titanium, and heating to 1700 ℃ in a vacuum environment to smelt to obtain the molten alloy.
And S5, adding the weighed aluminum-based intermediate alloy containing the nano TiC into the molten alloy, homogenizing for 10min, and pouring into a cylindrical graphite mold for molding to obtain a casting blank.
And S6, preparing the casting blank into powder by using an air atomization method in the prior art, and then carrying out mechanical vibration screening to obtain the titanium alloy powder. Wherein the sieved titanium alloy powder with the particle size of 15-53 mu m can be used as a selective laser melting material; the sieved 50-100 μm titanium alloy powder can be used as an electron beam melting material.
Example 5
The embodiment provides titanium alloy powder, and the preparation method comprises the following steps:
s1, mixing the carbon nano tube and titanium powder with the particle size of 300 meshes according to the molar ratio of 1:1 to obtain a mixture; and then, placing the mixture and aluminum powder with the particle size of 500 meshes in a ball mill according to the mass ratio of 40:60, and mixing for 24 hours at the speed of 50 revolutions per minute to obtain alloy powder.
S2, placing the alloy powder in an aluminum foil, pressing into a cylindrical pressing block with the diameter of 25mm and the height of 35mm, then placing the pressing block into a graphite mold, placing the graphite mold in a vacuum heating furnace, heating to 950 ℃ at the heating speed of 30 ℃/min for combustion synthesis, keeping the temperature for 10min, and cooling to room temperature along with the furnace to obtain the aluminum-based intermediate alloy containing the nano TiC.
S3, weighing aluminum, vanadium, titanium and the obtained aluminum-based intermediate alloy containing nano TiC, and controlling the dosage of the aluminum-based intermediate alloy to ensure that the mass percent of Al is 6.8%, the mass percent of V is 4.5%, the mass percent of Ti is 88.4% and the mass percent of nano TiC is 0.3% in the system.
S4, mixing the weighed aluminum, vanadium and titanium, and heating to 1750 ℃ in a vacuum environment for smelting to obtain the molten alloy.
And S5, adding the weighed aluminum-based intermediate alloy containing the nano TiC into the molten alloy, homogenizing for 10min, and pouring into a cylindrical graphite mold for molding to obtain a casting blank.
And S6, preparing the casting blank into powder by using an air atomization method in the prior art, and then carrying out mechanical vibration screening to obtain the titanium alloy powder. Wherein the sieved titanium alloy powder with the particle size of 15-53 mu m can be used as a selective laser melting material; the sieved 50-100 μm titanium alloy powder can be used as an electron beam melting material.
Example 6
The embodiment provides titanium alloy powder, and the preparation method comprises the following steps:
s1, mixing the carbon nano tube and titanium powder with the particle size of 300 meshes according to the molar ratio of 1:1 to obtain a mixture; then, the mixture and aluminum powder with the particle size of 500 meshes are placed in a ball mill according to the mass ratio of 30:70 and mixed for 24 hours at the speed of 50 revolutions per minute, and alloy powder is obtained.
S2, placing the alloy powder in an aluminum foil, pressing into a cylindrical pressing block with the diameter of 25mm and the height of 35mm, then placing the pressing block into a graphite mold, placing the graphite mold into a vacuum heating furnace, heating to 930 ℃ at the heating speed of 30 ℃/min for combustion synthesis, keeping the temperature for 10min, and cooling to room temperature along with the furnace to obtain the aluminum-based intermediate alloy containing nano TiC, wherein the grain size of the nano TiC is 60-120 nm.
S3, weighing aluminum, vanadium, titanium and the obtained aluminum-based intermediate alloy containing nano TiC, and controlling the dosage of the aluminum-based intermediate alloy to ensure that the mass percent of Al is 6%, the mass percent of V is 3.6%, the mass percent of Ti is 90.35% and the mass percent of nano TiC is 0.05% in the system.
S4, mixing the weighed aluminum, vanadium and titanium, and heating to 1720 ℃ in a vacuum environment for smelting to obtain the molten alloy.
And S5, adding the weighed aluminum-based intermediate alloy containing the nano TiC into the molten alloy, homogenizing for 10min, and pouring into a cylindrical graphite mold for molding to obtain a casting blank.
S6, preparing the casting blank into powder by using a plasma rotary electrode atomization method in the prior art, and then carrying out mechanical vibration screening to obtain the titanium alloy powder. Wherein the sieved titanium alloy powder with the particle size of 15-53 mu m can be used as a selective laser melting material; the sieved 50-100 μm titanium alloy powder can be used as an electron beam melting material.
Example 7
The embodiment provides titanium alloy powder, and the preparation method comprises the following steps:
s1, mixing the carbon nano tube and titanium powder with the particle size of 300 meshes according to the molar ratio of 1:1 to obtain a mixture; then, the mixture and aluminum powder with the particle size of 500 meshes are placed in a ball mill according to the mass ratio of 30:70 and mixed for 24 hours at the speed of 50 revolutions per minute, and alloy powder is obtained.
S2, placing the alloy powder in an aluminum foil, pressing into a cylindrical pressing block with the diameter of 25mm and the height of 35mm, then placing the pressing block into a graphite mold, placing the graphite mold into a vacuum heating furnace, heating to 930 ℃ at the heating speed of 30 ℃/min for combustion synthesis, keeping the temperature for 10min, and cooling to room temperature along with the furnace to obtain the aluminum-based intermediate alloy containing nano TiC, wherein the grain size of the nano TiC is 60-120 nm.
S3, weighing aluminum, vanadium, titanium and the obtained aluminum-based intermediate alloy containing nano TiC, and controlling the dosage of the aluminum-based intermediate alloy to ensure that the mass percent of Al is 6.5%, the mass percent of V is 4%, the mass percent of Ti is 89.3% and the mass percent of nano TiC is 0.2% in the system.
S4, mixing the weighed aluminum, vanadium and titanium, and heating to 1720 ℃ in a vacuum environment for smelting to obtain the molten alloy.
And S5, adding the weighed aluminum-based intermediate alloy containing the nano TiC into the molten alloy, homogenizing for 10min, and pouring into a cylindrical graphite mold for molding to obtain a casting blank.
S6, preparing the casting blank into powder by using a plasma rotary electrode atomization method in the prior art, and then carrying out mechanical vibration screening to obtain the titanium alloy powder. Wherein the sieved titanium alloy powder with the particle size of 15-53 mu m can be used as a selective laser melting material; the sieved 50-100 μm titanium alloy powder can be used as an electron beam melting material.
Comparative example 1
The comparative example provides a titanium alloy powder, and the preparation method comprises the following steps:
s1, weighing aluminum, vanadium and titanium, wherein the mass percent of Al is 6.1%, the mass percent of V is 3.66% and the mass percent of Ti is 90.24% in the system.
S2, mixing the weighed aluminum, vanadium and titanium, and heating to 1700 ℃ in a vacuum environment to smelt to obtain the molten alloy.
And S3, injecting the molten alloy into a cylindrical graphite die for molding to obtain a casting blank.
S4, preparing the casting blank into powder by using a plasma rotary electrode atomization method in the prior art, and then carrying out mechanical vibration screening to obtain the titanium alloy powder. Wherein the sieved titanium alloy powder with the particle size of 15-53 mu m can be used as a selective laser melting material; the sieved 50-100 μm titanium alloy powder can be used as an electron beam melting material.
Experimental example:
after the titanium alloy powder prepared in the comparative example 1 is subjected to selective laser melting, the obtained titanium alloy structure is shown in the attached drawing 1. As can be seen from fig. 1, the titanium alloy structure to which no nano TiC is added is a distinct columnar crystal structure.
The structure of the titanium alloy obtained by melting the titanium alloy powder obtained in example 1 by laser selective melting is shown in FIG. 2. As can be seen from fig. 2, the titanium alloy structure with the addition of nano TiC is a distinct equiaxed crystal structure.
In summary, in the embodiment of the present invention, by adding the nano TiC particles into the titanium-based master alloy, the isometric crystal ratio of the titanium alloy powder after additive manufacturing can be significantly increased, so as to reduce the columnar crystals, and greatly improve the uniformity of the structure after additive manufacturing, thereby avoiding the anisotropic phenomenon, reducing the crack formation tendency, and increasing the strength and plasticity of the metal product after additive manufacturing.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A preparation method of titanium alloy powder of endogenous nano TiC particles is characterized by comprising the following steps:
putting the titanium-based master alloy into a vacuum environment for smelting to obtain a molten alloy;
adding an aluminum-based intermediate alloy containing nano TiC into the molten alloy, homogenizing, and then casting to obtain a casting blank;
and preparing the casting blank into powder by using a plasma rotary electrode atomization method or a gas atomization method, and then screening to obtain the titanium alloy powder.
2. The method for preparing titanium alloy powder of endogenous nano TiC particles according to claim 1, wherein in the step, the smelting temperature is 1700-1750 ℃.
3. The method for preparing titanium alloy powder of endogenous nano TiC particles of claim 1, wherein the titanium-based master alloy is Ti-6Al-4V alloy.
4. The method for preparing titanium alloy powder of endogenous nano TiC particles according to claim 1, wherein the casting blank comprises Al, V, Ti and TiC, wherein the mass fraction of Al is 5.5% -6.8%, the mass fraction of V is 3.5% -4.5%, the mass fraction of Ti is 88.4% -90.99%, and the mass fraction of nano TiC is 0.01% -0.3%.
5. The method for preparing titanium alloy powder of endogenous nano TiC particles according to claim 4, wherein in the casting blank, the mass fraction of Al is 6% -6.5%, the mass fraction of V is 3.6% -4%, and the mass fraction of Ti is 89.3% -90.35%.
6. The method for preparing titanium alloy powder of endogenous nano TiC particles according to claim 1, wherein the method for preparing the nano TiC-containing aluminum-based intermediate alloy comprises the following steps:
ball-milling and mixing the carbon nano tube, the aluminum powder and the titanium powder to obtain alloy powder;
and (3) after the alloy powder is pressed and formed, burning and synthesizing the alloy powder at the temperature of 900-950 ℃ to obtain the aluminum-based intermediate alloy containing the nano TiC.
7. The method for preparing titanium alloy powder of endogenous nano TiC particles according to claim 6, wherein in the alloy powder, the molar ratio of the carbon nanotubes to the titanium powder is 1:1, and the total mass fraction of the carbon nanotubes to the titanium powder is 20% -40%.
8. A titanium alloy powder prepared by the preparation method of any one of claims 1 to 7.
9. The titanium alloy powder according to claim 8, wherein the titanium alloy structure obtained by selective laser melting or electron beam melting of the titanium alloy powder is an equiaxed structure.
10. Use of the titanium alloy powder of claim 8 or 9 in additive manufacturing.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113061779A (en) * | 2021-03-17 | 2021-07-02 | 东北大学 | Additive manufacturing method of nanoparticle reinforced titanium-based composite material based on selective electron beam melting |
| CN115747547A (en) * | 2022-10-26 | 2023-03-07 | 中冶赛迪工程技术股份有限公司 | Metallurgical method for improving alloy micro-morphology through nanoparticles, product and application thereof |
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