CN114525428A - Titanium alloy system suitable for additive manufacturing process and component manufacturing process - Google Patents
Titanium alloy system suitable for additive manufacturing process and component manufacturing process Download PDFInfo
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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
- B33Y10/00—Processes of additive manufacturing
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- 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
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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
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Abstract
The invention discloses a titanium alloy system suitable for an additive manufacturing process and a component manufacturing process, and belongs to the technical field of titanium alloys. The titanium alloy composition (wt.%): al: 1-4%, V: 3-8%, Fe: 3-8%, Ni: 0-2%, Zr: 0 percent and the balance of Ti. The titanium alloy is characterized in that: (1) in the additive manufacturing and solidifying process, elements in the titanium alloy can be enriched at the front end of a liquid-solid interface, so that the liquid phase at the front end of the interface is stable, and the continuous growth of columnar crystals is inhibited, thereby obtaining equiaxed grains; (2) the titanium alloy additive manufactured part has a weakened texture, and the mechanical property of the part can be made to be isotropic. The additive manufacturing component prepared by the titanium alloy has equiaxial crystals and weakened texture, fundamentally solves the bottleneck problems of columnar crystals and anisotropic mechanical property after the traditional titanium alloy additive manufacturing, and can be widely applied to the technical fields of aviation, aerospace, oceans, weapons and the like.
Description
Technical Field
The invention relates to the technical field of titanium alloy, in particular to a titanium alloy system suitable for an additive manufacturing process and a component manufacturing process.
Background
The titanium alloy has high specific strength and excellent corrosion resistance, and is widely applied to the fields of aviation, aerospace, ships, land decoration and the like. In addition to traditional forging, casting, machining titanium alloy components, the rapidly evolving powder additive manufacturing process in recent years provides a potential technological route for the efficient production of titanium alloy components of complex structures. However, because the additive manufacturing process belongs to a new process and a new technology, the titanium alloys selected by the additive manufacturing technology at present are all traditional titanium alloys suitable for forging, casting and the like, such as Ti-6Al-4V (TC4) alloy, Ti-5Al-5Mo-5V-1Cr-1Fe (TC18) alloy and the like. A large number of early research results show that titanium alloy parts manufactured by adopting the traditional titanium alloy additive materials such as TC4 and TC18 have obvious columnar crystal grains and anisotropic mechanical property, and hidden danger is brought to structural bearing safety.
The additive manufacturing is a manufacturing process of melting in a micro-area layer by layer, heat in the melting area is mainly transferred from top to bottom in the manufacturing process, the directional conduction of the heat leads crystal grains to preferentially grow in the opposite direction of the heat transmission in the solidification process of molten metal, so that columnar crystal grains which obviously grow from bottom to top are formed, the plastic deformation capacity of the material is obviously reduced by the thick columnar crystal grains, and meanwhile, the difference of mechanical properties in different directions is inevitably caused by the columnar crystal grains in a certain direction, namely, the anisotropic mechanical property is realized. Therefore, the columnar crystal grains of the titanium alloy additive manufacturing component have obvious adverse effects on mechanical properties, the elimination of the columnar crystal grains is a technical difficulty in the field of additive manufacturing, and although the tendency of the columnar crystal grains can be reduced through the optimization of the additive manufacturing process, the problem of the growth of the columnar crystal grains cannot be fundamentally solved.
In the process of titanium alloy additive manufacturing, the titanium alloy mainly undergoes liquid phase, beta solid phase, alpha + beta phase and the like in sequence in phase composition, a beta phase {100} texture is easily formed in the process of converting the liquid phase into the body-centered hexagonal beta solid phase, and in the process of melting the micro-regions layer by layer, the newly melted upper layer inherits the crystal grain orientation of the lower layer, namely the beta phase {100} texture gradually develops into a macroscopic whole component from a local micro-region. The {100} texture of the beta phase will also have an effect on the subsequent alpha phase crystal orientation. Therefore, the titanium alloy additive manufacturing process is easy to generate the preferred crystal orientation of the macroscopic component, and further causes the anisotropy of the mechanical property of the component, and has a significant adverse effect on the structural load.
In summary, the existing conventional titanium alloy additive manufacturing component has significant columnar crystal grains and preferred crystal orientation, which has significant adverse effect on the structural load of the additive manufacturing component, and how to eliminate the columnar crystal grains and preferred crystal orientation is always a technical difficulty in the field of titanium alloy additive manufacturing. The novel titanium alloy component system suitable for additive manufacturing is developed, columnar crystal grains and preferred crystal orientation are obviously eliminated, and the service safety and reliability of titanium alloy additive manufacturing parts can be obviously improved. The development of the high-strength titanium alloy suitable for the additive manufacturing process also meets the technical requirements of the high-technology fields of China, such as aviation, aerospace, ships, land assembly and the like, and can fill the gap in the technical field in China.
Disclosure of Invention
The titanium alloy component prepared by utilizing specific titanium alloy components and the process has isometric crystals and weakened beta-phase {100} texture and isotropic mechanical property, solves the bottleneck problems that the titanium alloy prepared by the traditional additive manufacturing has thick columnar crystals and anisotropic mechanical property, and greatly improves the structural service performance of the additive manufacturing component.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the titanium alloy system suitable for the additive manufacturing process comprises the following chemical components in percentage by weight:
al: 1-4%, V: 3-8%, Fe: 3-8%, Ni: 0-2%, Zr: 0 to 4%, O < 0.25%, N < 0.01%, H < 0.001%, and the balance Ti and unavoidable impurities.
The titanium alloy system is utilized to prepare the titanium alloy component, and the preparation process comprises the following steps:
(1) batching according to the chemical components of the titanium alloy system, and smelting a titanium alloy ingot by using a vacuum consumable furnace;
(2) forging the cast ingot into a bar in a beta single-phase region or an alpha + beta two-phase region, and preparing titanium alloy powder from the obtained bar by adopting a gas atomization method or a rotary electrode and other technologies;
(3) and (3) printing the titanium alloy part by using the titanium alloy powder prepared in the step (2) and adopting an additive manufacturing process (the heat source is high-energy beams such as laser beams or electron beams) according to the shape and the specification required by the final product.
In the step (1), the raw materials for preparing the titanium alloy ingot are sponge titanium, ferrovanadium, iron powder, nickel flakes, sponge zirconium, aluminum beans and the like, wherein: the content of a V element in the ferrovanadium alloy is 45-55 wt.%, and the balance is iron; the particle size range of the aluminum beans is 1-10 mm.
In the step (3), the 3D printed titanium alloy part is subjected to heat treatment in a vacuum or atmospheric furnace, residual stress is eliminated through the heat treatment, and the mechanical property of the titanium alloy part manufactured by additive manufacturing is optimized by adjusting the size of a titanium alloy microstructure; the heat treatment temperature range is 400-900 ℃, and the heat treatment time is 3-10 hours.
The design principle of the titanium alloy components and parts of the invention is as follows:
1. by utilizing the redistribution principle of alloy elements in the process of converting a liquid phase to a solid phase of a titanium alloy and assisting in a material genome calculation method, the additive elements enriched at the front end of a liquid-solid interface are screened out, so that the liquid phase at the front end of the interface is stable, the continuous growth of columnar crystals in the additive manufacturing process is inhibited, equiaxed grains are represented by the additive manufacturing component, and the preferred orientation of the crystals is obviously weakened.
By developing the TC18 traditional high-strength titanium alloy 3D printing process test (fig. 1 and fig. 2), it can be seen that the 3D printed parts all have obvious columnar grains and β {100} textures, and because β grains which are obviously coarsened compared with the forged state can be formed after the β phase zone heat treatment, the 3D printed titanium alloy is not suitable for eliminating the columnar grains and the β {100} textures by adopting the β phase zone heat treatment. Therefore, it is necessary to develop a new high-strength titanium alloy composition design suitable for 3D printing to eliminate the existence of obvious columnar crystals and β {100} textures in 3D printed titanium alloy parts. However, the titanium alloy has a great variety of added elements, which have different influences on the growth behavior of crystal grains in the liquid-solid phase change process, and the strengthening and toughening of the elements are different, so that the traditional test method has low efficiency and large investment. The material calculation simulation technology provides an efficient auxiliary means for the component design of the novel titanium alloy.
The thermodynamic equilibrium phase diagram of the titanium-based binary system alloy is simulated by calculation. Alloying elements are divided into two types by the characteristic of liquid-solid phase line, one type is the alloying elements represented by Cr, Fe, V, Cu, Ni, Zr and the like, the equilibrium concentration of the elements and Ti binary alloy liquid phase solute atoms is higher than that of a solid phase, namely, the solute atoms in the solid phase are deviated to the liquid phase in the liquid-solid phase change process; the other type is an alloy element represented by Al, Mo and Nb, the equilibrium concentration of solute atoms of the element and a Ti binary alloy liquid phase is lower than that of a solid phase, and thus the solute atoms in the liquid phase are deviated to the solid phase in the liquid-solid phase change process. The behavior of the segregation of solute atoms to a solid phase or a liquid phase in the liquid-solid phase transition theoretically affects the growth of solid phase grains, particularly, in the liquid-solid phase transition process of binary alloys such as Ti-Fe and the like, the solute atoms in the solid phase tend to segregate to the liquid phase, so that a solute atom enrichment area is formed near the liquid phase of a liquid-solid interface, the concentration of non-equilibrium elements enables the liquid phase to be more stable at the temperature, the growth of solid phase columnar grains is inhibited, and the weakening of the columnar grains and the preferential growth of crystals are facilitated.
The phase transformation process of the multi-element alloy is more complex, particularly brittle compounds can be formed in solid phase transformation, and the plasticity and the toughness of the alloy are greatly reduced. According to the binary alloy phase diagram analysis and the action of different elements in strengthening and toughening, a plurality of multi-element high-strength titanium alloys are preliminarily designed, the thermodynamic equilibrium phase diagram of the alloys is calculated and analyzed by means of material calculation simulation means, and the results are shown in figures 3-6, so that alloy systems without brittle compound precipitation are preliminarily screened out, wherein the alloy systems mainly comprise a Ti-Al-V-Fe system, a Ti-Al-V-Zr-Fe system and a Ti-Al-V-Fe-Zr-Ni system.
2. The content of iron element in the traditional titanium alloy is generally limited to be below 3 weight percent, in the invention, higher iron element is added, and the fine isometric crystal is obtained and simultaneously the iron segregation caused by smelting is avoided by milling, uniformly mixing fine powder and performing additive manufacturing for multi-pass local remelting.
Among the strengthening elements added to the titanium alloy, the iron element has the highest solid solution strengthening capability and the lowest price. However, the content of iron element in the conventional titanium alloy is generally limited to less than 3% by weight, mainly because the iron element is easy to segregate in the smelting process to form an iron-rich 'beta spot' area, so that the chemical composition and the mechanical property are uneven, and fatigue cracks are easy to grow at the position. In the present invention, the iron content of the novel titanium alloy is designed to be 3% by weight or more, the higher iron content can inhibit columnar grains as described above, and iron-rich "β -spot" regions that are likely to occur in conventional forged, cast titanium alloys do not occur in additive manufactured parts, mainly due to the following two points: (1) by preparing the novel titanium alloy powder and the micron-sized fine powder mixing process, millimeter/centimeter-sized iron-rich 'beta spots' formed in ingot smelting can be decomposed into micron-sized fine spherical powder, so that the size of an iron-rich area is remarkably reduced; (2) in the additive manufacturing process, the size of a molten pool is obviously larger than that of powder, and the same area is remelted for many times, so that even if fine spherical iron-rich powder exists, the fine spherical iron-rich powder is uniform and consistent with the rapid diffusion of iron elements in the process. Therefore, under the condition of additive manufacturing process, the novel titanium alloy with higher iron element content will not generate iron-rich 'beta spot' areas in the traditional titanium alloy.
3. The vanadium-iron alloy, iron powder and the like widely used in industrial steel are adopted as main intermediate alloys, which is beneficial to obviously reducing the cost of raw materials.
At present, the most widely used Ti-6Al-4V alloy comprises vanadium-aluminum alloy, aluminum beans and the like as the addition raw materials, wherein the vanadium-aluminum alloy has higher price, the 60 percent V vanadium-aluminum alloy has the price of 450 yuan/kg, and the 50 percent ferrovanadium alloy has the price of about 200 yuan/kg. In addition, because the problem of 'beta spot' formed by ingot smelting can not be considered, a large amount of iron powder can be added, and the raw material cost is further reduced.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the continuous growth of columnar crystals in the additive manufacturing process of the alloy is obviously inhibited, so that the additive manufacturing component is represented as equiaxed grains, and the plasticity, mechanical property isotropy and final service performance of the component are improved.
2. In the additive manufacturing process of the alloy, new solid-phase crystal grains are enabled to germinate in the liquid phase by increasing the stability of the liquid phase at the front end of the liquid/solid interface, so that the crystal orientation of the next layer of crystal grains inherited by the solid-phase crystal grains is avoided, the macroscopic texture of an additive manufacturing part is weakened finally, and the mechanical property isotropy of the additive manufacturing part is improved.
3. The alloy of the invention can be added with a large amount of iron element without forming an iron-rich 'beta spot' area in the additive manufacturing process, thereby obviously reducing the raw material cost of the novel alloy.
4. The titanium alloy system suitable for the additive manufacturing process can be used for preparing titanium alloy parts by adopting the existing additive manufacturing processes of laser, electron beams and the like, and can be widely applied to the technical field of manufacturing of titanium alloy structures of aviation, aerospace, ships, land-based equipment and the like.
Drawings
FIG. 1 is a titanium alloy test block made of TC18 titanium alloy by laser coaxial powder feeding additive manufacturing; wherein (a) and (b) are photographs of different viewing angles.
FIG. 2 is a representation of columnar grain morphology and crystal orientation of a TC18 alloy test plate manufactured by laser powder feeding additive manufacturing.
FIG. 3 is a thermodynamic equilibrium phase diagram of a Ti-1 Al-8V-xFe-based multi-component titanium alloy.
FIG. 4 is a thermodynamic equilibrium phase diagram of a Ti-2Al-5V-2Cr-2Zr-xFe multicomponent alloy.
FIG. 5 is a thermodynamic equilibrium phase diagram of a Ti-2Al-6V-2Zr-xFe multicomponent alloy.
FIG. 6 is a thermodynamic equilibrium phase diagram of a Ti-2Al-6V-6Fe-2Zr-xNi multi-component alloy.
FIG. 7 shows the morphology of the novel titanium alloy powder of example 1.
FIG. 8 shows a titanium alloy test block of example 1 of laser coaxial powder feeding additive manufacturing.
FIG. 9 shows a high-power texture of a titanium alloy test block in the laser coaxial powder feeding additive manufacturing example 1; wherein (a) and (b) are different multiples of the tissue morphology.
FIG. 10 is a representation of equiaxed grain morphology and crystal orientation of the alloy of laser co-axial powder feed additive manufacturing example 1.
FIG. 11 is a representation of equiaxed grain morphology and crystal orientation of the alloy of laser co-axial powder feed additive manufacturing example 2.
FIG. 12 is a representation of equiaxed grain morphology and crystal orientation of alloy of laser co-axial powder feed additive manufacturing example 3.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings and examples.
In the following examples and comparative examples, the target control compositions of the conventional TC18 titanium alloy and the newly developed 4 alloys, including the conventional TC18 titanium alloy and the newly developed 3 titanium alloys with different chemical compositions, are shown in table 1. The method comprises the following steps of alloy proportioning, electrode pressing, ingot smelting, ingot cogging forging, powder bar forging, titanium alloy powder preparation, titanium alloy additive manufacturing, additive manufacturing component heat treatment and the like of each alloy in sequence, and specifically comprises the following steps:
(1) according to target control components of 4 alloys listed in table 1, the quantity of the required intermediate alloy is calculated according to the proportion of each element, wherein the traditional TC18 titanium alloy raw material mainly comprises sponge titanium, aluminum molybdenum alloy, vanadium-aluminum-iron alloy, aluminum-vanadium alloy, metal chromium and the like, and the 3 raw materials required by newly developed alloys comprise sponge titanium, vanadium-iron alloy, iron powder, aluminum bean, sponge zirconium, nickel scrap and the like. And mixing the calculated raw materials to prepare a smelting electrode, and smelting a titanium alloy ingot with the ingot specification of 200kg by using a vacuum consumable electrode furnace and adopting a 3-time vacuum consumable method.
(2) And (3) cogging and forging the cast ingot in a beta single-phase region at 1150 ℃, and then forging and drawing for 2-4 times to prepare the bar with the diameter of 55 mm.
(3) The titanium alloy powder is prepared by using a bar with the diameter of 55mm and adopting the conventional processes of gas atomization powder preparation, rotary electrode powder preparation and the like. The powder is sieved according to the particle size according to different requirements of subsequent additive manufacturing on the particle size of the powder, for example, the powder with the diameter of 15-53 microns is suitable for a selective laser melting process, and the powder with the diameter of 63-200 microns is suitable for a coaxial laser powder feeding process.
(4) And selecting corresponding powder with proper granularity for preparing the titanium alloy part by utilizing different additive manufacturing processes such as laser, electron beam and the like.
(5) And (3) performing stress relief and aging synergistic heat treatment on the titanium alloy part manufactured by the additive, wherein the heat treatment system is that the titanium alloy part is subjected to heat preservation at 700 ℃ for 6 hours and then is subjected to air cooling.
TABLE 1 melting 4 kinds of titanium alloy ingot casting target control compositions
Comparative example 1:
the comparative example is a titanium alloy part manufactured by additive manufacturing of a traditional TC18 titanium alloy, fig. 1 shows that a TC18 titanium alloy test block is manufactured by laser coaxial powder feeding additive manufacturing, and fig. 2 shows that columnar crystal grain appearance and crystal orientation of a TC18 alloy test plate are characterized by laser powder feeding additive manufacturing. It can be seen that the conventional TC18 titanium alloy additive manufactured component has columnar grains with lengths of millimeter or more along the growth direction, and the preferred crystal orientation of the whole component is obvious, and a significant β {100} texture exists (fig. 1-2).
Comparative example 2:
according to the fact that the screened alloy elements represented by Cr, Fe, V, Cu, Ni, Zr and the like have the effect of inhibiting the growth of columnar grains, the multi-component alloy elements can be selected from the elements and the content of the alloy elements can be determined. The phase transformation process of the multi-element alloy is more complex, particularly brittle compounds can be formed in solid phase transformation, and the plasticity and the toughness of the alloy are greatly reduced. According to the analysis of a binary alloy phase diagram and the action of different elements in strengthening and toughening, 4 kinds of multi-element high-strength titanium alloys are preliminarily designed, namely Ti-Al-V-Fe-Zr-Ni series (1# alloy, example 1), Ti-Al-V-Zr-Fe series (2# alloy, example 2), Ti-Al-V-Fe series (3# alloy, example 3) and Ti-Al-V-Cr-Zr-Fe series (comparative example 2). The thermodynamic equilibrium phase diagrams of the above 4 alloys were subjected to computational analysis by means of material computational simulation, and the results are shown in fig. 3 to 6. It can be seen that the Ti-Al-V-Cr-Zr-Fe (comparative example 2) alloy has a precipitation of brittle compounds in a wide temperature range, which is not favorable for mechanical properties (FIG. 4). Alloy systems without brittle compound precipitation are preliminarily screened by thermodynamic equilibrium phase diagram calculation, including Ti-Al-V-Fe system (example 3), Ti-Al-V-Zr-Fe system (example 2) and Ti-Al-V-Fe-Zr-Ni system (example 1), and 3 alloys in examples 1-3 have no brittle compound precipitation in a large temperature range, so that the non-brittle compound precipitation can be realized in engineering practice.
Examples 1 to 3:
alloy components No. 1, No. 2 and No. 3 in the table 1 are taken as control targets, 3 novel titanium alloy ingots are smelted, and test blocks are prepared according to the sequence of forging, powder making and additive manufacturing processes. Fig. 7 shows the morphology of the novel titanium alloy powder of # 1, fig. 8 shows the morphology of the titanium alloy test block of # 1 produced by the coaxial laser powder feeding additive manufacturing process, fig. 9 shows the high-power structure morphology of the titanium alloy test block of # 1 produced by the coaxial laser powder feeding additive manufacturing process, and fig. 10 shows the isometric crystal grain morphology and the crystal orientation characterization of the alloy of # 1 produced by the coaxial laser powder feeding additive manufacturing process. As can be seen from fig. 9 and 10, the additive manufactured 1# new titanium alloy has an equiaxed grain morphology, the preferred crystal orientation of the whole part is not obvious, and no obvious beta {100} texture exists. Fig. 11 and 12 are isometric crystal morphology and crystal orientation characterization of laser coaxial powder feeding additive manufacturing alloys # 2 and # 3, respectively, and it can be seen that similar to alloy # 1, alloys # 2 and # 3 also have the isometric crystal morphology, and no significant β {100} texture exists.
In the alloys # 1, # 2 and # 3, the novel titanium alloy has equiaxed grain morphology after additive manufacturing, the preferred crystal orientation of the whole part is not obvious, and no obvious beta {100} texture exists (fig. 9-12).
The results of the examples and the comparative examples show that the continuous growth of columnar crystals in the additive manufacturing process of the alloy is obviously inhibited, so that the additive manufacturing component is represented by equiaxed grains, and the plasticity, the mechanical property isotropy and the final service performance of the component are improved. In the additive manufacturing process of the alloy, new solid-phase crystal grains are enabled to germinate in the liquid phase by increasing the stability of the liquid phase at the front end of the liquid/solid interface, so that the crystal orientation of the next layer of crystal grains inherited by the solid-phase crystal grains is avoided, the macroscopic texture of an additive manufacturing part is weakened finally, and the mechanical property isotropy of the additive manufacturing part is improved. The alloy of the invention can be added with a large amount of iron element without forming an iron-rich 'beta spot' area in the additive manufacturing process, thereby obviously reducing the raw material cost of the novel alloy. The novel titanium alloy suitable for the additive manufacturing process can adopt the existing additive manufacturing processes such as laser, electron beam and the like, and can be widely applied to the technical field of manufacturing of titanium alloy structures such as aviation, aerospace, ships, land-based clothes and the like. The novel titanium alloy suitable for the additive manufacturing process can adopt the existing additive manufacturing processes such as laser, electron beam and the like, and can be widely applied to the technical field of manufacturing of titanium alloy structures such as aviation, aerospace, ships, land-based clothes and the like.
Claims (4)
1. A titanium alloy system suitable for an additive manufacturing process, characterized by: the titanium alloy system comprises the following chemical components in percentage by weight:
al: 1-4%, V: 3-8%, Fe: 3-8%, Ni: 0-2%, Zr: 0 to 4%, O < 0.25%, N < 0.01%, H < 0.001%, and the balance Ti and unavoidable impurities.
2. A process for preparing a titanium alloy component using the titanium alloy system of claim 1, wherein: the preparation process comprises the following steps:
(1) batching according to the chemical components of the titanium alloy system, and smelting a titanium alloy ingot by using a vacuum consumable furnace;
(2) forging the cast ingot into a bar in a beta single-phase region or an alpha + beta two-phase region, and preparing titanium alloy powder from the obtained bar by adopting a gas atomization method or a rotary electrode and other technologies;
(3) and (3) printing the titanium alloy part by using the titanium alloy powder prepared in the step (2) and adopting an additive manufacturing process (the heat source is high-energy beams such as laser beams or electron beams) according to the shape and the specification required by the final product.
3. The process for producing a titanium alloy member according to claim 2, characterized in that: in the step (1), the raw materials for preparing the titanium alloy ingot are sponge titanium, ferrovanadium, iron powder, nickel sheets, sponge zirconium, aluminum beans and the like, wherein: the content of a V element in the ferrovanadium alloy is 45-55 wt.%, and the balance is iron; the particle size range of the aluminum beans is 1-10 mm.
4. The process for producing a titanium alloy member according to claim 2, wherein: in the step (3), the 3D printed titanium alloy part is subjected to heat treatment in a vacuum or atmospheric furnace, residual stress is eliminated through the heat treatment, and the mechanical property of the titanium alloy part manufactured by the additive manufacturing is optimized by adjusting the size of a titanium alloy microstructure; the heat treatment temperature range is 400-900 ℃, and the heat treatment time is 3-10 hours.
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| CN114959362A (en) * | 2022-06-20 | 2022-08-30 | 长安大学 | High-strength high-plasticity laser additive manufacturing titanium alloy based on equiaxial fine grain strengthening |
| CN115466869A (en) * | 2022-08-19 | 2022-12-13 | 西安建筑科技大学 | Preparation method of low-cost high-strength Ti-Al-V-Fe alloy material |
| CN115537600A (en) * | 2022-10-19 | 2022-12-30 | 上海交通大学 | Additive manufacturing high-strength and high-toughness beta titanium alloy material and preparation method thereof |
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| CN115889812B (en) * | 2022-11-23 | 2024-04-02 | 上海交通大学 | Additive manufacturing high-strength plastic titanium alloy and preparation method and application thereof |
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