CN115679231B - Process for improving high-temperature plasticity of titanium-aluminum-based alloy - Google Patents
Process for improving high-temperature plasticity of titanium-aluminum-based alloy Download PDFInfo
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- UQZIWOQVLUASCR-UHFFFAOYSA-N alumane;titanium Chemical compound [AlH3].[Ti] UQZIWOQVLUASCR-UHFFFAOYSA-N 0.000 title claims abstract description 95
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 93
- 239000000956 alloy Substances 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 54
- 230000008569 process Effects 0.000 title claims abstract description 39
- 238000005242 forging Methods 0.000 claims abstract description 107
- 238000010146 3D printing Methods 0.000 claims abstract description 43
- 238000004321 preservation Methods 0.000 claims abstract description 26
- 239000000843 powder Substances 0.000 claims abstract description 20
- 239000011521 glass Substances 0.000 claims abstract description 16
- 239000000463 material 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
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 230000003064 anti-oxidating effect Effects 0.000 claims abstract description 9
- 238000010894 electron beam technology Methods 0.000 claims abstract description 9
- 229910000838 Al alloy Inorganic materials 0.000 claims description 12
- 230000009467 reduction Effects 0.000 claims description 8
- 229910052719 titanium Inorganic materials 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 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 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 229920000742 Cotton Polymers 0.000 abstract description 7
- 238000012545 processing Methods 0.000 abstract description 3
- 229910000765 intermetallic Inorganic materials 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 14
- 230000003647 oxidation Effects 0.000 description 12
- 238000007254 oxidation reaction Methods 0.000 description 12
- 239000000654 additive Substances 0.000 description 11
- 230000000996 additive effect Effects 0.000 description 11
- 239000010410 layer Substances 0.000 description 10
- 238000005520 cutting process Methods 0.000 description 7
- 239000010936 titanium Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229910010038 TiAl Inorganic materials 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-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
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011156 metal matrix composite Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
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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
Abstract
The invention discloses a process for improving high-temperature plasticity of a titanium-aluminum-based alloy, and belongs to the technical field of titanium-aluminum intermetallic compound processing. The specific implementation process is as follows: firstly, removing defects such as cracks visible to naked eyes 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 material, heating and preserving heat, and simultaneously preheating an anvil head of a forging press to 650-700 ℃; after the heat preservation is finished, forging is carried out for one time along the printing direction of the 3D printing sample, and the forging speed is less than 1s ‑1 The method comprises the steps of carrying out a first treatment on the surface of the And after forging, covering the forging with heat preservation cotton, and cooling to room temperature. The invention has simple process and low cost, can realize the cooperative promotion of the high-temperature strength and the plasticity of the titanium-aluminum-based alloy, and is convenient for large-scale industrial application.
Description
Technical Field
The invention belongs to the technical field of titanium-aluminum intermetallic compound processing, and particularly relates to a process for improving high-temperature plasticity of titanium-aluminum-based alloy.
Background
The specific gravity of the titanium-aluminum-based alloy is only half that of the nickel-based superalloy, and the titanium-aluminum-based alloy has the outstanding advantages of high-temperature specific strength, high specific stiffness, excellent high-temperature oxidation resistance, creep resistance, fatigue resistance and the like, and is a light high-temperature structural material with great application prospect. However, low room temperature plasticity and poor hot working deformability are significant obstacles limiting their application. The effect of heat treatment on the structure and mechanical properties of Ti-48Al-2Cr-2Nb alloy is reported in the published Studies of Shuoshi: the performance of the as-cast titanium-aluminum-based alloy at 800 ℃ is specifically that the tensile strength is 500MPa at maximum, the yield strength is 455MPa at maximum and the elongation is 5.53 percent.
The additive manufacturing technology, also called 3D printing, is a scientific and technical system for directly manufacturing parts by three-dimensional data driving of the parts based on the principle of discrete stacking, can realize near-net manufacturing of the parts, and is particularly suitable for manufacturing high-temperature structural parts of aerospace engines with complex structures and high precision requirements. However, the titanium-aluminum parts manufactured and formed based on the powder bed additive have inherent defects of weak interlayer binding force, residual pores and the like due to the factors of powder quality, high solidification speed, high thermal stress and the like. Thus, in order to reduce the porosity, it is often necessary to add a lengthy and expensive post-hiping treatment. However, the residual pores, although closed, also lead to coarsening of the microstructure. Heretofore, titanium-aluminum based alloy 3D prints have been difficult to achieve in combination with properties comparable to those of wrought materials.
Attempts have been made to combine additive manufacturing techniques with deformation techniques to enhance the mechanical properties of the material. As in patent application No. 201580021564.6, entitled "method of manufacturing a metal part or a metal matrix composite part from an additive manufacturing followed by forging operation of the part", it has been proposed to manufacture a preform by additive manufacturing of additive materials in a continuous powder layer and then to undergo a forging operation to obtain a final part with numerous unexpected benefits. But fails to specifically suggest an optimized forging process; the metal materials involved are not specifically limited to titanium-aluminum-based alloys. In the patent application No. 201711013952.7 entitled "composite forming system and method combining additive manufacturing and forging", it is proposed to add a real-time micro-forging device to the additive manufacturing device that can move with the material conveyor to forge the solidified portion. However, the equipment has large modification difficulty, small degree of freedom and higher complexity, is not beneficial to application and popularization, and does not relate to optimized forging process parameters; the metal materials involved are not specifically limited to titanium-aluminum-based alloys.
In the patent with the application number of 202111209674.9 and the name of 'a method for preparing a Ti-55531 high-strength high-toughness titanium alloy 3D printing-forging combination', the compactness, strength and plasticity of the 3D printing titanium alloy are improved by repeated hammering and subsequent annealing treatment through die forging. Although the method can greatly improve the mechanical property of the alloy, the treated object is not the titanium-aluminum-based alloy (namely, the alloy with the aluminum and titanium contents of more than 45at percent). Meanwhile, the processing procedure is long, the die loss is large, and the advantages of the additive manufacturing technology are weakened; in addition, 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 plasticity of the titanium-aluminum-based alloy, which adopts a 3D printing blank to be matched with a small-strain forging process operated in one step, can reduce the difficulty of direct die forging, solves the inherent defect problem of a 3D printing sample piece, comprehensively improves the high-temperature strength and plasticity of the 3D printing titanium-aluminum-based alloy, and accelerates the popularization and application of the 3D printing titanium-aluminum-based alloy in aerospace.
The invention attempts to improve the high-temperature strength and plasticity of a product by performing a small-strain forging process of one-step operation on a 3D printing titanium-aluminum-based alloy (namely an alloy containing 45-49at.% Ti and 45-49at.% Al).
According to the process for improving the high-temperature plasticity of the titanium-aluminum-based alloy, a 3D printing technology is adopted to obtain a titanium-aluminum-based alloy blank; the obtained titanium-aluminum-based alloy blank is subjected to forging deformation to obtain a product with excellent high-temperature strong plasticity; the titanium-aluminum-based alloy contains 45-49% of Ti and 45-49% of Al in atom percent.
Preferably, the process for improving the high-temperature plasticity of the titanium-aluminum-based alloy comprises, by atomic percentage, 47.5-48.5% of Ti, 47.5-48.5% of Al, 0.5-2.5% of Nb and 0.5-2.5% of Cr.
As a further preferred aspect, the titanium-aluminum-based alloy contains 48% Ti, 48% Al, 2% Nb,2% Cr in atomic percent.
Preferably, the process for improving the high-temperature 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 10-12mA, substrate preheating temperature 1050-1150 deg.C, layer thickness 50-100 μm, serpentine scanning strategy
Preferably, the process for improving the high-temperature plasticity of the titanium-aluminum-based alloy comprises the following steps of:
firstly, before forging, removing defects such as rough surfaces, macroscopic cracks and the like from a 3D printing titanium-aluminum-based alloy blank;
secondly, 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-based alloy blank from which the surface defects are removed;
thirdly, after the glass powder is naturally air-dried, placing the 3D printing titanium-aluminum-based alloy blank into a heating furnace for heat preservation;
fourth step: preheating an anvil head of a forging press to 650-700 ℃;
fifth step: placing the 3D printing titanium aluminum-based alloy blank subjected to heat preservation on a forging press for forging deformation; the forging rate is less than 1s -1 ；
Sixth step: after forging, cooling to room temperature at a cooling rate of 100-400 ℃/h. In industrial application, the forging can be covered by heat-insulating cotton and cooled to room temperature.
In the second step, a layer of oxidation-resistant glass powder is uniformly coated on the surface of the 3D printing titanium-aluminum-based alloy blank, and the thickness is 0.2mm.
Preferably, the process for improving the high-temperature plasticity of the titanium-aluminum-based alloy comprises the third step that the heating temperature of the blank is 1050-1180 ℃ and the heat preservation time is 90-120 min.
As a further preferable scheme, in the third step, the 3D printing titanium aluminum base alloy blank coated with the anti-oxidation coating is put into a heating furnace with the temperature of 1080-1150 ℃ and is kept for 120min.
Preferably, in the process for improving the high-temperature plasticity of the titanium-aluminum-based alloy, in the fifth step, the forging direction is parallel to the printing direction of the material.
Preferably, the process for improving the high-temperature plasticity of the titanium-aluminum-based alloy comprises the step five of completing the forging process in one step without returning to the furnace for heat preservation.
Preferably, in the process for improving the high-temperature plasticity of the titanium-aluminum-based alloy, in the fifth step, the forging reduction is 10% -40%.
In the fifth step, the 3D printing titanium-aluminum alloy blank after heat preservation is placed on a forging press, forging is carried out for one time along the printing direction of the material, the forging reduction is controlled to be 10% -30%, and heat preservation is carried out without returning to the furnace in the middle.
As a further preferable embodiment, in the fifth step, the forging rate is 0.01s -1 -0.1s -1 。
The invention relates to a process for improving high-temperature plasticity of a titanium-aluminum-based alloy, which is characterized in that 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%.
The invention takes the titanium-aluminum-based alloy prepared by the electron beam selective melting method as a material, and adopts the optimized forging process to realize the high-temperature strength and plasticity synergistic enhancement of the 3D printing titanium-aluminum-based alloy. For better contrast, the 3D printed titanium-aluminum-based alloy was prepared from the same batch or taken from the same piece of material from an electron beam selective melting process.
The principle of the invention is as follows: unlike conventional methods for preparing titanium-aluminum-based alloys, 3D printing techniques have the technological feature of rapid deposition, resulting in 3D printed titanium-aluminum-based alloys containing a large amount of gamma-phase favorable for deformation with very little lamellar structure. In addition, the invention requires smaller deformation, and these factors lead the thermal deformation of the alloy to be mainly based on a work hardening mechanism, so that a substructure is more easily generated, and the recrystallization phenomenon is relatively lagged. The invention comprehensively utilizes the advantages of the additive manufacturing technology, adopts one-step forging deformation with small strain capacity, and can effectively refine the structure of the alloy or maintain the original granularity through the forging technological parameters provided by the invention; meanwhile, a large number of dislocations are introduced to form a substructure. Under various toughening mechanisms, the high-temperature strength and plasticity of the 3D printing titanium-aluminum-based alloy are synergistically enhanced. It is emphasized that with the method of the invention, for parts of complex shape, the preformed part can be printed by additive manufacturing technology, and then the die forging with one step of small strain amount is performed, thereby not only reducing the difficulty of direct die forging, but also obtaining the final part with good quality.
Drawings
FIG. 1 (a) is a photograph of the macroscopic morphology of a 3D printed titanium aluminum-based alloy prior to forging in example 1.
Fig. 1 (b) is a photograph of the macroscopic morphology 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 TiAl-based alloy before forging in example 1,
FIG. 3 (b) is an IQ diagram of a 3D printed TiAl-based alloy after forging in example 1,
FIG. 3 (c) is an IPF superimposed grain boundary angle diagram of a fine grain region of a 3D printed TiAl-based alloy before forging in example 1;
fig. 3 (D) is an IPF superimposed grain boundary angle diagram of a fine grain region of a 3D printed 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 from fig. 3 (a), 3 (b), 3 (c) and 3 (d), after forging, the microstructure of the alloy is refined and a large number of substructures are created.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the present invention more apparent, the following detailed description will be 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 preheating temperature of the substrate is 1100 ℃, the layer thickness is 50-100 mu m, and the serpentine scanning strategy is adopted. The raw material is alloy powder with granularity less than 150 microns.
The 3D printed titanium-aluminum-based alloy in this example was a block of size 70mm by 20mm by 40mm (titanium-aluminum-based alloy consisting of, in atomic percent, 48% Ti,2% Nb,2% Cr, the balance Al). The forging process is characterized in that the forging process 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, removing defects such as rough surfaces, macroscopic cracks and the like of a 3D printing titanium-aluminum-based alloy cast ingot by utilizing linear cutting;
secondly, uniformly coating a layer of oxidation-resistant glass powder on the surface of the 3D printing titanium-aluminum-based alloy blank, wherein the thickness of the oxidation-resistant glass powder is 0.2mm;
thirdly, placing the 3D printing titanium aluminum-based alloy blank coated with the anti-oxidation coating into a heating furnace with the temperature of 1100 ℃, and preserving heat for 120min;
fourthly, preheating an anvil head of a forging press to 650 ℃;
fifthly, placing the 3D printed titanium-aluminum alloy blank after heat preservation on a forging press, and forging for one time along the printing (height) direction of the material, wherein the forging rate is 0.1s -1 Forging reduction is 10%, and the middle 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.
In this example, a 3D printed titanium aluminum alloy forging (fig. 1 (b)) with good appearance quality was obtained. Its high temperature mechanical properties (fig. 2): the ultimate tensile strength is 561MPa and 538MPa respectively, and the yield strength is 501MPa and 460MPa respectively at 750 ℃ and 800 ℃. The corresponding elongations were 2.5% and 11.8%, respectively, which were 400% and 1586% higher than in the 3D printed state. The forging process adopted by the invention can realize the synergistic enhancement of the high-temperature strength and the plasticity 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. Microscopic structure was sampled from the center of the specimen (fig. 3), and it was found that the crystal grains were refined and a large number of substructures were produced.
Compared with the existing as-cast process, the product obtained by the invention has far better performance at 800 ℃ than the existing as-cast product.
Example 2
The 3D printed titanium-aluminum-based alloy in this example was identical in composition, printing parameters and sample size to that in example 1. The specific forging process is as follows:
firstly, before forging, removing defects such as rough surfaces, macroscopic cracks and the like of a 3D printing titanium-aluminum-based alloy cast ingot by utilizing linear cutting;
secondly, uniformly coating a layer of oxidation-resistant glass powder on the surface of the 3D printing titanium-aluminum-based alloy blank, wherein the thickness of the oxidation-resistant glass powder is 0.2mm;
thirdly, placing the 3D printing titanium aluminum-based alloy blank coated with the anti-oxidation coating into a heating furnace with the temperature of 1130 ℃ and preserving heat for 120min;
fourthly, preheating an anvil head of a forging press to 650 ℃;
fifthly, placing the 3D printed titanium-aluminum alloy blank after heat preservation on a forging press, and forging for one time along the printing (height) direction of the material, wherein the forging rate is 0.1s -1 Forging the forging reduction of 20% and maintaining the temperature without returning to the furnace in the middle;
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 with good appearance quality is obtained by the embodiment, and the high-temperature mechanical property is as follows: the ultimate tensile strength is 750 MPa, 560 MPa and the yield strength is 543MPa and 502MPa respectively at 750 ℃ and 800 ℃. The corresponding elongations are 2.7% and 13.8%, respectively, and compared with the 3D printing state, the elongations are respectively improved by 440% and 1871%.
Example 3
The 3D printed titanium aluminum base alloy (composition, printing parameters, and example 1 were identical) dimensions in this example were: 54mm by 15mm by 36mm. The forging process is characterized in that the forging process 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, removing defects such as rough surfaces, macroscopic cracks and the like of a 3D printing titanium-aluminum-based alloy cast ingot through linear cutting;
secondly, uniformly coating a layer of oxidation-resistant glass powder on the surface of the 3D printing titanium-aluminum-based alloy blank, wherein the thickness of the oxidation-resistant glass powder is 0.2mm;
thirdly, placing the 3D printing titanium aluminum-based alloy blank coated with the anti-oxidation coating into a heating furnace with the temperature of 1150 ℃ and preserving heat for 120min;
fourthly, preheating an anvil head of a forging press to 650 ℃;
fifthly, placing the 3D printed titanium-aluminum alloy blank after heat preservation on a forging press, and forging for one time along the printing (height) direction of the material, wherein the forging rate is 0.01s -1 Forging reduction is 30%, and the middle 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 with good appearance quality is obtained by the embodiment, and the high-temperature mechanical property is as follows: the ultimate tensile strength is 605MPa,573MPa and the yield strength is 556MPa and 521MPa respectively at 750 ℃ and 800 ℃. The corresponding elongations are respectively 2.75% and 13.9%, and compared with the 3D printing state, the elongations are respectively improved by 450% and 1886%.
Comparative example 1
The 3D printed titanium-aluminum-based alloy in this example was identical in composition, printing parameters and dimensions to those in example 3. The specific forging process is as follows:
firstly, before forging, removing defects such as rough surfaces, macroscopic cracks and the like of a 3D printing titanium-aluminum-based alloy cast ingot through linear cutting;
secondly, uniformly coating a layer of oxidation-resistant glass powder on the surface of the 3D printing titanium-aluminum-based alloy blank, wherein the thickness of the oxidation-resistant glass powder is 0.2mm;
thirdly, placing the 3D printing titanium aluminum-based alloy blank coated with the anti-oxidation coating into a heating furnace with the temperature of 1100 ℃, and preserving heat for 120min;
fourthly, preheating an anvil head of a forging press to 650 ℃;
fifthly, placing the 3D printed titanium-aluminum alloy blank after heat preservation on a forging press, and forging for one time along the printing (height) direction of the material, wherein the forging rate is 1s -1 Forging reduction is 40%, and the middle 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 printed titanium aluminum alloy forging of this embodiment is cracked.
Comparative example 2
The 3D printed titanium-aluminum-based alloy in this example was identical in composition, printing parameters and dimensions to those in example 3. The specific forging process is as follows:
firstly, before forging, removing defects such as rough surfaces, macroscopic cracks and the like of a 3D printing titanium-aluminum-based alloy cast ingot through linear cutting;
secondly, uniformly coating a layer of oxidation-resistant glass powder on the surface of the 3D printing titanium-aluminum-based alloy blank, wherein the thickness of the oxidation-resistant glass powder is 0.2mm;
thirdly, placing the 3D printing titanium aluminum-based alloy blank coated with the anti-oxidation coating into a heating furnace with the temperature of 1150 ℃ and preserving heat for 120min;
fourthly, preheating an anvil head of a forging press to 650 ℃;
fifthly, placing the 3D printed titanium-aluminum alloy blank after heat preservation on a forging press, and forging for one time along the printing (height) direction of the material, wherein the forging rate is 1s -1 Forging reduction is 40%, and the middle 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 printed titanium aluminum alloy forging of this embodiment is cracked.
The above description is illustrative of the invention and is not intended to be limiting. The invention is defined by the scope of the claims, and the invention can be modified in any form without departing from the basic structure of the invention.
Claims (3)
1. A process for improving high-temperature plasticity of a titanium-aluminum-based alloy is characterized by comprising the following steps of: firstly, preparing a titanium-aluminum-based alloy blank by adopting an electron beam selective melting method; the technological parameters are as follows: electron beam current 10-12mA, substrate preheating temperature 1050-1150 deg.C, layer thickness 50-100 μm, serpentine scanning strategy; the obtained titanium-aluminum-based alloy blank is subjected to forging deformation to obtain a product with excellent high-temperature strong plasticity; the titanium-aluminum-based alloy contains 47.5-48.5% of Ti, 47.5-48.5% of Al, 0.5-2.5% of Nb and 0.5-2.5% of Cr by atom percent;
the forging deformation includes the steps of:
firstly, before forging, removing rough surfaces and macroscopic crack defects from a 3D printing titanium-aluminum-based alloy blank;
secondly, 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-based alloy blank from which the surface defects are removed;
thirdly, after the glass powder is naturally air-dried, placing the titanium-aluminum-based alloy blank into a heating furnace for heat preservation; the heating temperature of the blank is 1050-1180 ℃, and the heat preservation time is 90-120 min;
fourth step: preheating an anvil head of a forging press to 650-700 ℃;
fifth step: placing the 3D printing titanium-aluminum alloy blank subjected to heat preservation on a forging press for forging deformation; the forging rate is less than 1s -1 The method comprises the steps of carrying out a first treatment on the surface of the The forging direction is parallel to the printing direction of the material; the forging process is completed once, and the middle part is not returned to the furnace for heat preservation; forging reduction is 10% -40%;
sixth step: after forging, cooling to room temperature at a cooling rate of 100-400 ℃/h.
2. The process for improving the high-temperature plasticity of a titanium-aluminum-based alloy according to claim 1, wherein the process comprises the following steps of: the titanium-aluminum-based alloy contains 48% Ti, 48% Al, 2% Nb and 2% Cr by atom percent.
3. The process for improving the high-temperature plasticity of a titanium-aluminum-based alloy according to claim 1, wherein the process comprises the following steps of: the obtained product has tensile strength of 535-565MPa, yield strength of 450-505MPa and elongation of 2.5-12% at 750-800 ℃, wherein the obtained product has tensile strength of 535-540MPa, yield strength of 455-460MPa and elongation of 11.5-12%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211126445.5A CN115679231B (en) | 2022-09-16 | 2022-09-16 | Process for improving high-temperature plasticity of titanium-aluminum-based alloy |
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| CN202211126445.5A CN115679231B (en) | 2022-09-16 | 2022-09-16 | Process for improving high-temperature plasticity of titanium-aluminum-based alloy |
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| WO2019103539A1 (en) * | 2017-11-24 | 2019-05-31 | 한국기계연구원 | Titanium-aluminum-based alloy for 3d printing, having excellent high temperature characteristics, and manufacturing method therefor |
| CN110512116A (en) * | 2019-09-09 | 2019-11-29 | 中国航发北京航空材料研究院 | A kind of high Nb-TiAl intermetallic compound of multicomponent high-alloying |
| CN114951522A (en) * | 2022-06-28 | 2022-08-30 | 中南大学 | Isothermal forging method of monocrystal TiAl |
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| DE102015103422B3 (en) * | 2015-03-09 | 2016-07-14 | LEISTRITZ Turbinentechnik GmbH | Process for producing a heavy-duty component of an alpha + gamma titanium aluminide alloy for piston engines and gas turbines, in particular aircraft engines |
| EP3372700B1 (en) * | 2017-03-10 | 2019-10-09 | MTU Aero Engines GmbH | Method for making forged tial components |
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| WO2019103539A1 (en) * | 2017-11-24 | 2019-05-31 | 한국기계연구원 | Titanium-aluminum-based alloy for 3d printing, having excellent high temperature characteristics, and manufacturing method therefor |
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