CN115679231A - Process for improving high-temperature strong plasticity of titanium-aluminum-based alloy - Google Patents
Process for improving high-temperature strong plasticity of titanium-aluminum-based alloy Download PDFInfo
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- CN115679231A CN115679231A CN202211126445.5A CN202211126445A CN115679231A CN 115679231 A CN115679231 A CN 115679231A CN 202211126445 A CN202211126445 A CN 202211126445A CN 115679231 A CN115679231 A CN 115679231A
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- UQZIWOQVLUASCR-UHFFFAOYSA-N alumane;titanium Chemical compound [AlH3].[Ti] UQZIWOQVLUASCR-UHFFFAOYSA-N 0.000 title claims abstract description 105
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 102
- 239000000956 alloy Substances 0.000 title claims abstract description 102
- 238000000034 method Methods 0.000 title claims abstract description 62
- 238000005242 forging Methods 0.000 claims abstract description 104
- 238000010146 3D printing Methods 0.000 claims abstract description 45
- 238000004321 preservation Methods 0.000 claims abstract description 18
- 230000003064 anti-oxidating effect Effects 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 16
- 239000011248 coating agent Substances 0.000 claims abstract description 14
- 238000000576 coating method Methods 0.000 claims abstract description 14
- 230000007547 defect Effects 0.000 claims abstract description 13
- 238000007639 printing Methods 0.000 claims abstract description 13
- 239000011521 glass Substances 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000010894 electron beam technology Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 16
- 229910000838 Al alloy Inorganic materials 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 8
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims 1
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- 229920000742 Cotton Polymers 0.000 abstract description 7
- 229910000765 intermetallic Inorganic materials 0.000 abstract description 2
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- 238000005520 cutting process Methods 0.000 description 7
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- 239000010936 titanium Substances 0.000 description 6
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 2
- 229910004349 Ti-Al Inorganic materials 0.000 description 2
- 229910004692 Ti—Al Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
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- 241000270295 Serpentes Species 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
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- 239000002905 metal composite material Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention discloses a process for improving high-temperature strong plasticity of a titanium-aluminum-based alloy, and belongs to the technical field of processing of titanium-aluminum intermetallic compounds. The specific implementation process comprises the following steps: firstly, removing defects such as macroscopic cracks on the surface of a titanium-aluminum-based alloy sample formed by electron beam 3D printing; then, uniformly coating a layer of anti-oxidation glass powder on the surface of the forging press, heating and preserving heat, and simultaneously preheating a anvil head of the forging press to 650-700 ℃; after heat preservation is finished, forging is carried out once along the printing direction of the 3D printing sample, and the forging speed is less than 1s ‑1 (ii) a After forging, the forgings are covered with heat-insulating cotton and cooled to room temperature. The invention has simple process and low cost, can realize the cooperative improvement of the high-temperature strength and the plasticity of the titanium-aluminum-based alloy, and is convenient for specificationAnd (4) modeling industrial application.
Description
Technical Field
The invention belongs to the technical field of processing of titanium-aluminum intermetallic compounds, and particularly relates to a process for improving high-temperature strong plasticity of a titanium-aluminum-based alloy.
Background
The titanium-aluminum-based alloy has the specific gravity of only half of that of the nickel-based high-temperature alloy, has the outstanding advantages of high-temperature specific strength, high specific stiffness, excellent high-temperature oxidation resistance, excellent creep resistance, excellent fatigue resistance and the like, and is a light high-temperature structural material with wide application prospect. However, low room temperature plasticity and poor hot-working deformability are great obstacles limiting their applications. The influence of casting type and heat treatment on the structure and mechanical properties of Ti-48Al-2Cr-2Nb alloy is reported in the master book: the performance of the cast titanium-aluminum-based alloy at 800 ℃, specifically the maximum tensile strength of 500MPa, the maximum yield strength of 455MPa and the elongation of 5.53 percent.
The additive manufacturing technology, also called 3D printing, is a scientific and technical system based on the principle of 'discrete-accumulation', directly manufacturing parts by driving three-dimensional data of the parts, can realize near-net manufacturing of the parts, and is particularly suitable for manufacturing high-temperature structural members of aerospace engines with complex structures and high precision requirements. However, due to the factors of powder quality problem, high solidification speed, high thermal stress and the like, the titanium-aluminum parts manufactured and formed on the basis of powder bed additive manufacturing have inherent defects of weak interlayer bonding force, residual pores and the like. Therefore, in order to reduce porosity, a lengthy and expensive post-hiping treatment is often added. However, the residual porosity, although closed, also leads to a coarsening of the microstructure. So far, the titanium-aluminum base alloy 3D printing piece is difficult to achieve the comprehensive performance which is comparable with that of a forging material.
Attempts have been made to combine additive manufacturing techniques with deformation techniques to enhance the mechanical properties of the material. As in the patent application No. 201580021564.6 entitled "method for manufacturing a metal or metal matrix composite part by an operation of additive manufacturing followed by forging of the part", it has been proposed to make a preform by additive manufacturing with the addition of material in successive powder layers, and then to go through a forging operation to obtain the final part, with numerous unexpected advantages. But fails to specifically propose an optimized forging process; and the metallic material involved is not specifically limited to a titanium-aluminum-based alloy. In a patent with application number 201711013952.7 entitled "combined additive manufacturing and forging forming system and method", it is proposed to add a real-time micro-forging device to the additive manufacturing device, which moves together with the material conveyor to forge the solidified part. However, the equipment is difficult to modify, small in degree of freedom, high in complexity, not beneficial to application and popularization, and optimized forging process parameters are not involved; meanwhile, the metal material involved in the method is not specifically limited to titanium-aluminum-based alloy.
In a patent with application number 202111209674.9 entitled "a method for preparing a Ti-55531 high-strength and high-toughness titanium alloy 3D printing-forging combined member", the compactness, strength and plasticity of a 3D printing titanium alloy are improved by repeated hammering of die forging and subsequent annealing treatment. Although the mechanical properties of the alloy can be greatly improved by the method, the processing object is not a titanium-aluminum-based alloy (namely, the content of aluminum and titanium is more than 45at percent). Meanwhile, the treatment process is long, the loss of the die is large, and the advantages of the additive manufacturing technology are weakened; besides, the method does not mention the high temperature mechanical properties of the alloy.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a process for improving the high-temperature strong plasticity of the titanium-aluminum-based alloy, which adopts a small-strain forging process with the cooperation of a 3D printing blank and one-step operation, can reduce the difficulty of direct die forging, solve the problem of inherent defects of a 3D printing sample piece, comprehensively improve the high-temperature strength and plasticity of the 3D printing titanium-aluminum-based alloy, and accelerate the popularization and application of the 3D printing titanium-aluminum-based alloy in aerospace.
The present invention for the first time attempts to improve the high temperature strength and plasticity of the product by performing a one-step, low strain forging process on a 3D-printed titanium-aluminum based alloy (i.e., an alloy containing 45-49at.% Ti and 45-49at.% Al).
The invention relates to a process for improving high-temperature strong plasticity of a titanium-aluminum-based alloy, which comprises the steps of firstly obtaining a titanium-aluminum-based alloy blank by adopting a 3D printing technology; forging and deforming the obtained titanium-aluminum base alloy blank to obtain a product with high temperature, strong plasticity and excellent plasticity; the titanium-aluminum based alloy contains, in atomic percent, 45-49% of Ti,45-49% of Al.
Preferably, the process of the present invention for improving the high temperature toughness of a titanium aluminum based alloy, comprises, in atomic percent, 47.5-48.5% Ti, 47.5-48.5% Al, 0.5-2.5% Nb,0.5-2.5% Cr.
More preferably, the titanium-aluminum-based alloy contains, in atomic percent, 48% Ti, 48% Al, 2% Nb,2% Cr.
Preferably, the process for improving the high-temperature strength and plasticity of the titanium-aluminum-based alloy adopts an electron beam selective melting method to prepare a titanium-aluminum-based alloy blank; the technological parameters are as follows: electron beam current of 10-12mA, substrate preheating temperature of 1050-1150 deg.C, layer thickness of 50-100 μm, and serpentine scanning strategy
Preferably, the forging deformation process for improving the high-temperature strength and plasticity of the titanium-aluminum-based alloy comprises the following steps of:
firstly, removing defects such as a rough surface, macroscopic cracks and the like of a 3D printing titanium-aluminum-based alloy blank before forging;
step two, uniformly coating a layer of anti-oxidation glass powder with the thickness of 0.1-0.5mm on the surface of the 3D printing titanium-aluminum base alloy blank with the surface defects removed;
step three, after the glass powder is naturally dried, putting the 3D printed titanium-aluminum base alloy blank into a heating furnace for heat preservation;
the fourth step: preheating an anvil head of a forging press to 650-700 ℃;
the fifth step: placing the heat-insulated 3D printed titanium-aluminum-based alloy blank on a forging press for forging deformation; forging speedThe rate is less than 1s -1 ；
And a sixth step: after forging, cooling to room temperature at a cooling rate of 100-400 ℃/h. In industrial application, the forge piece can be covered by heat-insulating cotton and cooled to room temperature.
Preferably, in the second step, a layer of anti-oxidation glass powder is uniformly coated on the surface of the 3D printing titanium-aluminum-based alloy blank, and the thickness of the anti-oxidation glass powder is 0.2mm.
Preferably, in the third step, the heating temperature of the blank is 1050-1180 ℃, and the heat preservation time is 90-120min.
As a further preferable scheme, in the third step, the 3D printing titanium-aluminum-based alloy blank coated with the anti-oxidation coating is placed in a heating furnace at the temperature of 1080-1150 ℃, and the temperature is kept for 120min.
Preferably, in the process for improving the high-temperature strong plasticity of the titanium-aluminum-based alloy, in the fifth step, the forging direction is parallel to the printing direction of the material.
Preferably, in the fifth step, the forging process is completed once, and the middle part is not returned to the furnace for heat preservation.
Preferably, in the fifth step, the forging reduction is 10-40%.
As a further preferable scheme, in the fifth step, the 3D printed titanium-aluminum alloy blank after heat preservation is placed on a forging press, forging is performed for one time along the printing direction of the material, the forging reduction amount is controlled to be 10% -30%, and the middle part is not returned to the furnace for heat preservation.
As a further preferable mode, in the fifth step, the forging rate is 0.01s -1 -0.1s -1 。
The invention relates to a process for improving the high-temperature strength and plasticity of a titanium-aluminum-based alloy, wherein the tensile strength of an obtained product at 750-800 ℃ is 535-565MPa, the yield strength is 450-505MPa, and the elongation is 2.5-12%, wherein the tensile strength of the obtained product at 800 ℃ is 535-540MPa, the yield strength is 455-460MPa, and the elongation is 11.5-12%.
The titanium-aluminum-based alloy prepared by the electron beam selective melting method is used as a material, and the optimized forging process is adopted, so that the high-temperature strength and plasticity of the 3D printing titanium-aluminum-based alloy are synergistically enhanced. For better comparison, the 3D printing titanium-aluminum-based alloy is prepared from the same batch by an electron beam selective melting method or is taken from the same block of material.
The principle of the invention is as follows: different from the titanium-aluminum-based alloy prepared by the conventional method, the 3D printing technology has the process characteristic of rapid deposition, so that the 3D printed titanium-aluminum-based alloy contains a large amount of gamma phases beneficial to deformation, and the lamellar structure is few. In addition, the deformation required by the invention is small, the thermal deformation of the alloy is mainly caused by a work hardening mechanism due to the factors, a substructure is more easily generated, and the recrystallization phenomenon is relatively delayed. The invention comprehensively utilizes the advantages of the additive manufacturing technology, adopts one-step forging deformation with small strain amount, and can effectively refine the structure of the alloy or keep the original granularity by the forging process parameters provided by the invention; meanwhile, a large number of dislocations are introduced to form a substructure. Under various strengthening and toughening mechanisms, the high-temperature strength and plasticity of the 3D printing titanium-aluminum-based alloy are synergistically enhanced. It is emphasized that, by the method, for parts with complex shapes, the preformed piece can be printed by using an additive manufacturing technology, and then the one-step small-strain die forging is carried out, so that the difficulty of direct die forging can be reduced, and the final piece with good quality can be obtained.
Drawings
Fig. 1 (a) is a macro topography photograph of the titanium-aluminum based alloy before forging in 3D printing of example 1.
Fig. 1 (b) is a macro topography photograph of the 3D printed titanium aluminum based alloy after forging in example 1.
FIG. 2 shows the mechanical properties of 3D printed titanium-aluminum based alloy before and after forging in example 1.
FIG. 3 (a) is an IQ diagram of a 3D-printed Ti-Al based alloy before forging in example 1,
FIG. 3 (b) is an IQ diagram of a 3D-printed Ti-Al based alloy after forging in example 1,
FIG. 3 (c) is a graph of IPF superimposed grain boundary angles of a fine grained region of a 3D printed titanium aluminum based alloy prior to forging in example 1;
FIG. 3 (D) is a graph of IPF superimposed grain boundary angles of the 3D printed fine grained region of a titanium aluminum based alloy after forging in example 1.
As can be seen from fig. 1 (a) and 1 (b), the surface quality of the forged sample was good.
As can be seen from FIG. 2, the high temperature strength and plasticity of the alloy are improved after forging.
As can be seen in fig. 3 (a), 3 (b), 3 (c), 3 (d), the microstructure of the alloy is refined after forging, and a large number of substructures are produced.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description is given with reference to specific embodiments, but the scope of the present invention is not limited to the following.
Example 1
Preparing a titanium-aluminum-based alloy blank by adopting an electron beam selective melting method; the technological parameters are as follows: the electron beam current is 10-12mA, the substrate preheating temperature is 1100 ℃, the layer thickness is 50-100 mu m, and the scanning strategy is a snake shape. The raw material is alloy powder with the particle size less than 150 microns.
The 3D printed titanium-aluminium based alloy in this example was a block with dimensions 70mm x 20mm x 40mm (in atomic percent, titanium-aluminium based alloy consists of 48% Ti,2% Nb,2% Cr, the remainder being Al). The method is characterized in that the method is divided into two parts by wire cutting, wherein one part is used for observing an original structure and testing the mechanical property of the original structure, and the other part is used for forging, and the specific process is as follows:
firstly, before forging, removing defects such as a rough surface and macroscopic cracks of a 3D printing titanium-aluminum-based alloy cast ingot by using linear cutting;
step two, uniformly coating a layer of anti-oxidation glass powder with the thickness of 0.2mm on the surface of the 3D printing titanium-aluminum-based alloy blank;
thirdly, putting the 3D printing titanium-aluminum-based alloy blank coated with the anti-oxidation coating into a heating furnace at the temperature of 1100 ℃, and preserving heat for 120min;
fourthly, preheating an anvil head of the forging press to 650 ℃;
fifthly, placing the heat-insulated 3D printed titanium-aluminum alloy blank on a forging press, forging the blank once along the printing (height) direction of the material, wherein the forging speed is 0.1s -1 The forging reduction is 10 percent, and the middle part is not melted back and is kept warm;
and sixthly, after forging, covering the forge piece with heat preservation cotton and cooling to room temperature.
This example produced a 3D-printed titanium-aluminum alloy forged part having excellent outer surface quality (fig. 1 (b)). Its high temperature mechanical properties (fig. 2): at 750 ℃ and 800 ℃, the ultimate tensile strength is 561MPa and 538MPa respectively, and the yield strength is 501MPa and 460MPa respectively. The corresponding elongation rates are 2.5% and 11.8%, and compared with the 3D printing state, the elongation rates are respectively improved by 400% and 1586%. The forging process adopted by the invention can realize the high-temperature strength and plasticity synergistic enhancement of the 3D printing titanium-aluminum-based alloy, and particularly realizes the effect of greatly improving the elongation of the product while ensuring or improving the strength. The microstructure was observed by sampling from the center of the sample (FIG. 3), and it was found that the grains were refined and a large amount of substructure was generated.
Compared with the existing cast-state process, the product obtained by the invention has far better performance than the existing cast-state product at 800 ℃.
Example 2
The 3D printed titanium-aluminum based alloy in this example was the same as example 1 in composition, printing parameters and sample size. The forging process comprises the following steps:
firstly, before forging, removing defects such as a rough surface, visible cracks and the like on a 3D printed titanium-aluminum-based alloy cast ingot by utilizing linear cutting;
step two, uniformly coating a layer of anti-oxidation glass powder with the thickness of 0.2mm on the surface of the 3D printing titanium-aluminum-based alloy blank;
thirdly, putting the 3D printing titanium-aluminum-based alloy blank coated with the anti-oxidation coating into a heating furnace at the temperature of 1130 ℃ and preserving heat for 120min;
fourthly, preheating an anvil head of the forging press to 650 ℃;
fifthly, placing the heat-insulated 3D printed titanium-aluminum alloy blankForging the material in one pass along the printing (height) direction of the material on a forging press at a forging rate of 0.1s -1 The forging reduction is 20 percent, and the middle part is not returned to the furnace for heat preservation;
and sixthly, after forging, covering the forge piece with heat preservation cotton and cooling to room temperature.
The 3D printing titanium-aluminum alloy forging with good surface quality is obtained in the embodiment, and the high-temperature mechanical property of the forging is as follows: at 750 ℃ and 800 ℃, the ultimate tensile strength is 590MPa and 565MPa respectively, and the yield strength is 543MPa and 502MPa respectively. The corresponding elongation rates are respectively 2.7% and 13.8%, and compared with the 3D printing state, the elongation rates are respectively improved by 440% and 1871%.
Example 3
In this example, the dimensions of the 3D printed titanium-aluminum-based alloy (the composition and printing parameters are the same as those in example 1) are as follows: 54mm by 15mm by 36mm. The method is divided into two parts by wire cutting, wherein one part is used for observing original tissues and testing mechanical properties of the original tissues, and the other part is used for forging, and the specific process is as follows:
firstly, before forging, carrying out wire cutting on a 3D printed titanium-aluminum-based alloy cast ingot to remove defects such as a rough surface and macroscopic cracks;
step two, uniformly coating a layer of anti-oxidation glass powder with the thickness of 0.2mm on the surface of the 3D printing titanium-aluminum-based alloy blank;
thirdly, putting the 3D printing titanium-aluminum-based alloy blank coated with the anti-oxidation coating into a heating furnace at 1150 ℃, and preserving heat for 120min;
fourthly, preheating an anvil head of the forging press to 650 ℃;
fifthly, placing the heat-insulated 3D printed titanium-aluminum alloy blank on a forging press, and forging the blank once along the printing (height) direction of the material at a forging rate of 0.01s -1 The forging reduction is 30 percent, and the middle part is not melted back and is kept warm;
and sixthly, after forging, covering the forge piece with heat preservation cotton and cooling to room temperature.
The 3D printing titanium-aluminum alloy forging with good surface quality is obtained in the embodiment, and the high-temperature mechanical property of the forging is as follows: the ultimate tensile strength is 605MPa and 573MPa, and the yield strength is 556MPa and 521MPa respectively at 750 ℃ and 800 ℃. The corresponding elongation rates are respectively 2.75% and 13.9%, and compared with the 3D printing state, the elongation rates are respectively improved by 450% and 1886%.
Comparative example 1
The 3D printing of the titanium-aluminum-based alloy in this example is the same as the composition, printing parameters and dimensions in example 3. The forging process comprises the following steps:
firstly, before forging, removing defects such as a rough surface, macroscopic cracks and the like from a 3D printing titanium-aluminum-based alloy cast ingot through linear cutting;
step two, uniformly coating a layer of anti-oxidation glass powder with the thickness of 0.2mm on the surface of the 3D printing titanium-aluminum-based alloy blank;
thirdly, putting the 3D printing titanium-aluminum-based alloy blank coated with the anti-oxidation coating into a heating furnace at 1100 ℃, and preserving heat for 120min;
fourthly, preheating an anvil head of the forging press to 650 ℃;
fifthly, placing the heat-insulated 3D printed titanium-aluminum alloy blank on a forging press, forging the blank once along the printing (height) direction of the material, wherein the forging speed is 1s -1 The forging reduction is 40 percent, and the middle part is not returned to the furnace for heat preservation;
and sixthly, after forging, covering the forge piece with heat preservation cotton and cooling to room temperature.
The 3D printing titanium-aluminum alloy forging piece of the embodiment cracks.
Comparative example 2
The 3D printing of the titanium-aluminum-based alloy in this example is the same as the composition, printing parameters and dimensions in example 3. The forging process comprises the following steps:
firstly, before forging, removing defects such as a rough surface, macroscopic cracks and the like from a 3D printing titanium-aluminum-based alloy cast ingot through linear cutting;
step two, uniformly coating a layer of anti-oxidation glass powder with the thickness of 0.2mm on the surface of the 3D printing titanium-aluminum-based alloy blank;
thirdly, putting the 3D printing titanium-aluminum-based alloy blank coated with the anti-oxidation coating into a heating furnace at 1150 ℃, and preserving heat for 120min;
fourthly, preheating an anvil head of the forging press to 650 ℃;
fifthly, placing the heat-insulated 3D printed titanium-aluminum alloy blank on a forging press, and forging the blank once along the printing (height) direction of the material at a forging rate of 1s -1 The forging reduction is 40 percent, and the middle part is not returned to the furnace for heat preservation;
and sixthly, after forging, covering the forge piece with heat preservation cotton and cooling to room temperature.
The 3D printing titanium-aluminum alloy forging piece of the embodiment cracks.
The foregoing description is illustrative of the present invention and is not to be construed as limiting thereof. The scope of the present invention is defined by the claims, and the present invention may be modified in any manner without departing from the basic structure of the invention.
Claims (10)
1. A process for improving high-temperature strong plasticity of titanium-aluminum-based alloy is characterized by comprising the following steps: firstly, obtaining a titanium-aluminum-based alloy blank by adopting 3D printing; forging and deforming the obtained titanium-aluminum base alloy blank to obtain a product with high temperature, strong plasticity and excellent plasticity; the titanium-aluminum based alloy contains, in atomic percentage, 45-49% of Ti,45-49% of Al.
2. The process for improving the high-temperature strength and plasticity of the titanium-aluminum based alloy according to claim 1, wherein the process comprises the following steps: ti content of 47.5-48.5% by atomic percentage, al content of 47.5-48.5% by atomic percentage, nb content of 0.5-2.5% by atomic percentage, and Cr content of 0.5-2.5% by atomic percentage.
3. The process for improving the high-temperature strength and plasticity of the titanium-aluminum-based alloy according to claim 1, wherein the process comprises the following steps: the titanium-aluminum based alloy contains, in atomic percent, 48% Ti, 48% Al, 2% Nb,2% Cr.
4. The process for improving the high-temperature strength and plasticity of the titanium-aluminum based alloy according to claim 2, wherein the process comprises the following steps: preparing a titanium-aluminum-based alloy blank by adopting an electron beam selective melting method; the technological parameters are as follows: the electron beam current is 10-12mA, the substrate preheating temperature is 1050-1150 ℃, the layer thickness is 50-100 mu m, and the method adopts a snake-shaped scanning strategy.
5. The process for improving the high-temperature strength and plasticity of the titanium-aluminum-based alloy according to claim 1, wherein the process comprises the following steps:
the forging deformation comprises the following steps:
firstly, removing defects such as a rough surface, macroscopic cracks and the like of a 3D printing titanium-aluminum-based alloy blank before forging;
step two, uniformly coating a layer of anti-oxidation glass powder with the thickness of 0.1-0.5mm on the surface of the 3D printing titanium-aluminum base alloy blank with the surface defects removed;
thirdly, after the glass powder is naturally dried, putting the titanium-aluminum base alloy blank into a heating furnace for heat preservation;
the fourth step: preheating an anvil head of a forging press to 650-700 ℃;
the fifth step: placing the 3D printed titanium-aluminum alloy blank subjected to heat preservation on a forging press for forging deformation; forging rate less than 1s -1 ；
And a sixth step: after forging, the steel is cooled to room temperature at a cooling rate of 100-400 ℃/h.
6. The process for improving the high-temperature strength and plasticity of the titanium-aluminum-based alloy according to claim 5, wherein the step of preparing the titanium-aluminum-based alloy comprises the following steps: in the third step, the heating temperature of the blank is 1050-1180 ℃, and the heat preservation time is 90-120min.
7. The process for improving the high-temperature strength and plasticity of the titanium-aluminum based alloy according to claim 5, wherein the step of preparing the titanium-aluminum based alloy comprises the following steps: and the forging direction of the fifth step is parallel to the printing direction of the material.
8. The process for improving the high-temperature strength and plasticity of the titanium-aluminum based alloy according to claim 5, wherein the step of preparing the titanium-aluminum based alloy comprises the following steps: and step five, finishing the forging process once without returning the furnace in the middle for heat preservation.
9. The process for improving the high-temperature strength and plasticity of the titanium-aluminum-based alloy according to claim 5, wherein the step of preparing the titanium-aluminum-based alloy comprises the following steps: and the forging reduction in the fifth step is 10-40%.
10. The process for improving the high-temperature strength and plasticity of the titanium-aluminum based alloy according to claim 5, wherein the step of preparing the titanium-aluminum based alloy comprises the following steps: the tensile strength of the obtained product at 750-800 ℃ is 535-565MPa, the yield strength is 450-505MPa, and the elongation is 2.5-12%, wherein the tensile strength of the obtained product at 800 ℃ is 535-540MPa, the yield strength is 455-460MPa, and the elongation is 11.5-12%.
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