CN112139648A - Titanium-aluminum intermetallic compound in-situ additive directional solidification method - Google Patents

Titanium-aluminum intermetallic compound in-situ additive directional solidification method Download PDF

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CN112139648A
CN112139648A CN202010912307.4A CN202010912307A CN112139648A CN 112139648 A CN112139648 A CN 112139648A CN 202010912307 A CN202010912307 A CN 202010912307A CN 112139648 A CN112139648 A CN 112139648A
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titanium
aluminum
intermetallic compound
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directional solidification
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CN112139648B (en
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徐俊强
周琦
孔见
彭勇
高显鹏
郭顺
杨子威
王朋坤
顾锁林
万学明
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Nanjing University of Science and Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K15/00—Electron-beam welding or cutting
    • B23K15/0033—Preliminary treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K15/00—Electron-beam welding or cutting
    • B23K15/0026—Auxiliary equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K15/00—Electron-beam welding or cutting
    • B23K15/06—Electron-beam welding or cutting within a vacuum chamber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/18—Dissimilar materials
    • 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
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Abstract

The invention discloses a preparation method of a directional solidification component of a titanium-aluminum intermetallic compound, which comprises the following steps: carrying out pretreatment work such as polishing and cleaning on the substrate, clamping and fixing, calculating and setting a corresponding wire feeding speed according to the components of the titanium-aluminum intermetallic compound; preheating the substrate according to the size of the actual titanium-aluminum intermetallic compound in-situ additive directional solidification component; the electron beam is printed on the substrate according to the set parameters, the wire feeding is carried out after the beam current is stabilized, the beam current is continuously fed after the wire materials enter the same molten pool, the deposition is carried out according to the set program until the size of the in-situ additive component meets the requirement, the wire feeding is stopped, and the electron beam is closed; and (3) placing the titanium-aluminum intermetallic compound bar in a vacuum environment for cooling, and taking out after completely cooling to room temperature. The directional solidification process of the titanium-aluminum intermetallic compound can realize the preparation of components with complex shapes, reduces the introduction of impurities and has high production efficiency.

Description

Titanium-aluminum intermetallic compound in-situ additive directional solidification method
Technical Field
The invention relates to the technical field of preparation of titanium-aluminum intermetallic compounds, in particular to an in-situ additive directional solidification method of a titanium-aluminum intermetallic compound.
Background
With the development of science and technology, the traditional materials and processing technology cannot meet increasingly complex service environments, and the demand for materials with higher performance and special functions is increasingly urgent. In the fields of aviation, aerospace industry, energy and the like, novel materials with high temperature resistance, low density, ultrahigh strength and high elastic modulus are urgently needed to reduce the dead weight of structural parts of the engine, improve the combustion temperature of the engine and achieve the aim of improving the efficiency. The intermetallic compound has wide application prospect in the field of aerospace as a high-temperature structural material, wherein the TiAl intermetallic compound has low density (3.3-4.2 g/cm)3) High strength, excellent high temperature oxidation resistance, creep resistance and flame retardancy have received much attention.
However, the TiAl intermetallic compound has low room temperature plasticity, poor thermal deformation capability and difficult cutting, and the practical application of the TiAl intermetallic compound is limited. Two methods are commonly used to improve the microstructure of titanium-aluminum intermetallic compounds to their performance potential: material properties are improved by reducing lamellar grain size through thermomechanical processing and eliminating transverse grain boundaries with directional solidification. The thermomechanical treatment method consumes huge energy, has general effect, does not greatly improve the room-temperature plasticity, and is easy to generate cracks, so that the part is invalid. The directional solidification technology is characterized in that a transverse grain boundary vertical to the stress main stress direction is eliminated through certain control, so that the optimal orientation is consistent with the bearing direction, and the fracture toughness, creep strength and heat resistance of the titanium-aluminum intermetallic compound are improved.
At present, the directional solidification technology for titanium-aluminum intermetallic compounds is mostly adopted in graphite or Al2O3、ZrO2And the like in conventional ceramic crucibles. The invention patent with the patent number CN201710579069.8 provides a beta single-phase solidified TiAl-based alloy and a structure control method thereof, a mother alloy cast ingot is prepared by adopting a water-cooled copper crucible induction melting method, then the mother alloy cast ingot is cut into cylindrical rods, and directional solidification is carried out at the drawing speed of 3-100 mu m/s and the temperature gradient of 10-30 ℃/mm, so as to obtain the beta single-phase solidified TiAl-based alloy. However, the titanium-aluminum intermetallic compound has active chemical properties, is very easy to generate physical and chemical reactions with crucible materials in the directional solidification process, introduces impurities to seriously damage the mechanical properties of the titanium-aluminum intermetallic compound, and has the original purpose of contrarily improving the mechanical properties. And the cold crucible directional solidification technology always has the problem of lateral heat dissipation, thereby influencing the structural stability of directional solidification and having lower production efficiency. The invention patent with the patent number of CN102935506A proposes a continuous suspension type cold crucible directional solidification casting device, wherein a trapezoidal boss is annularly arranged on the inner wall of a water-cooled copper crucible, an upper induction coil is wound outside the crucible, the boss is arranged in the coil, and an excited alternating magnetic field is diffused inwards through a crucible slot to generate a hot area, so that the suspension liquid feeding of a material rod is realized. The suspension melting liquid feeding, sequential filling and directional solidification of the molten metal are realized, the chemical reaction of the titanium-aluminum alloy melt and the mold shell is avoided, and the processing efficiency of the titanium-aluminum alloy directional solidification is improved. But for the test piece with a complex section, the method is difficult to realize reasonable distribution of the electromagnetic field, and the near-net-shaped test piece with the size meeting the requirement is obtained. Therefore, the directional solidification process of the titanium-aluminum intermetallic compound has the following problems: the complex-shaped member is difficult to prepare, and is easy to introduce impurities, and the production efficiency is low. The development of a directional solidification process method of the titanium-aluminum intermetallic compound suitable for industrial application becomes a key technical problem of industrial application of the titanium-aluminum intermetallic compound.
Disclosure of Invention
The invention aims to provide a preparation method of a directional solidification component of a titanium-aluminum intermetallic compound, which is used for solving the defects that the directional solidification of a complex structure of the titanium-aluminum intermetallic compound is difficult, the production efficiency is low and impurities are easily introduced.
The technical scheme adopted by the invention for solving the technical problem is as follows:
the titanium-aluminum intermetallic compound in-situ additive directional solidification method adopts an electron beam double-wire or multi-wire additive manufacturing system, and comprises the following steps:
(1) carrying out pretreatment work such as polishing and cleaning on a substrate, clamping and fixing, determining the angle of a wire feeding gun, and then putting a working platform into a vacuum chamber and vacuumizing;
(2) setting parameters such as accelerating voltage, working height, focusing beam current, electron beam scanning frequency, electron beam scanning range and the like according to requirements, calculating and setting corresponding wire feeding speed according to components of the titanium-aluminum intermetallic compound;
(3) preheating the substrate according to the size of the actual titanium-aluminum intermetallic compound in-situ additive directional solidification component;
(4) the electron beam is shot on the substrate according to set parameters, the wire feeding is carried out after the wire flow is stabilized, the wire flow is continuously carried out after the wire enters the same molten pool, the deposition is carried out according to a set program, the working platform is slowly reduced after the deposition of one layer is finished until the size of the in-situ material adding component meets the requirement, and the electron beam is closed after the wire feeding is stopped;
(5) and (3) placing the titanium-aluminum intermetallic compound bar in a vacuum environment for cooling, and taking out after completely cooling to room temperature.
Furthermore, pure titanium is selected as an additive substrate in the additive process, the thickness of the substrate is larger than 15mm, the influence of substrate deformation on the additive process is reduced, pure aluminum and pure titanium are selected as wire materials, and the diameter of each wire material is 1.2mm-3.0 mm.
Furthermore, the angle setting range of the wire feeding gun is 30-60 degrees, wires at the intersection points of the wires are placed up and down, the intersection points are positioned in the molten pool, and the aluminum wires are placed under other wires due to the low-melting-point characteristic of the aluminum wires, so that the aluminum wires are ensured to enter the molten pool.
Furthermore, the accelerating voltage is 60kV to 150kV, the working height of the platform is 250 mm to 270mm, the focusing beam current is 1100-1200mA, the scanning frequency of the electron beam is 300Hz to 800Hz, the scanning range of the electron beam is 300 percent to 900 percent of the focus, and the vacuum degree of the working environment is lower than 7 multiplied by 10-2Pa。
Further, the substrate is preheated in a stepped mode, the preheating beam current starts from 5mA, and 5mA is increased every time until the substrate preheating area is red hot. The diameter of the preheating area of the substrate is obviously larger than that of the titanium-aluminum metal compound bar.
Furthermore, the wire feeding speed of the titanium wire and the aluminum wire is in the range of 200-500mm/min, the deposition speed is in the range of 200-500mm/min, and the single-layer thickness is kept at 300-500 μm.
Furthermore, the atomic percentage of the designed components of the titanium-aluminum intermetallic compound is 7-8% higher than that of the actual components, because the electron beam has high energy density and high central temperature, and the element evaporation phenomenon exists.
Furthermore, the beam current of the electron beam is 20-30% higher than that of the normal process so as to ensure that the titanium-aluminum intermetallic compound is kept in an overheated state. Meanwhile, the electron beam continuously works to scan at a high speed, so that the energy loss of radiation heat dissipation is reduced, heat accumulation is realized, the heat loss is mainly changed into contact heat transfer, and a directional temperature gradient is formed.
Furthermore, the difference between the components of the substrate and the components of the titanium-aluminum intermetallic compound bar is large, a transition layer of 10-15mm needs to be reserved in the material increase process, and the transition layer is cut off after the material increase is finished.
Further, the titanium-aluminum intermetallic compound bar is cooled in a vacuum environment by adopting a two-step method, and the cooling is carried out in a high-vacuum environment (less than 7 multiplied by 10)-2Pa) for 3-4 hours, and cooling to room temperature under a low vacuum degree environment (0.1-1 Pa).
Compared with the prior art, the invention has the following remarkable advantages:
1. the directional solidification process of the titanium-aluminum intermetallic compound can realize the preparation of a component with a complex shape, reduces the introduction of impurities and has high production efficiency; 2. the invention adopts layer-by-layer deposition through additive manufacturing, realizes near-net forming, greatly improves the material utilization rate, reduces the preparation cost, and is an ideal process for preparing the titanium-aluminum intermetallic compound; 3. the invention is in vacuum environment, the heat dissipation mode mainly comprises radiation heat transfer and contact heat transfer, the heat accumulation phenomenon is obvious, the unidirectional control of heat flow can be realized, and the possibility is provided for the directional solidification of the titanium-aluminum intermetallic compound.
Drawings
FIG. 1 is a dendrite morphology of an in-situ additive directionally solidified titanium-aluminum intermetallic compound component.
FIG. 2 is an EBSD map of a titanium-aluminum intermetallic in-situ additive directionally solidified component.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
The titanium-aluminum intermetallic compound in-situ additive directional solidification method adopts an electron beam double-wire or multi-wire additive manufacturing system, and comprises the following steps:
(1) carrying out pretreatment work such as polishing and cleaning on a substrate, clamping and fixing, determining the angle of a wire feeding gun, and then putting a working platform into a vacuum chamber and vacuumizing;
(2) setting parameters such as accelerating voltage, working height, focusing beam current, electron beam scanning frequency, electron beam scanning range and the like according to requirements, calculating and setting corresponding wire feeding speed according to components of the titanium-aluminum intermetallic compound;
(3) preheating the substrate according to the size of the actual titanium-aluminum intermetallic compound in-situ additive directional solidification component;
(4) the electron beam is shot on the substrate according to set parameters, the wire feeding is carried out after the wire flow is stabilized, the wire flow is continuously carried out after the wire enters the same molten pool, the deposition is carried out according to a set program, the working platform is slowly reduced after the deposition of one layer is finished until the size of the in-situ material adding component meets the requirement, and the electron beam is closed after the wire feeding is stopped;
(5) and (3) placing the titanium-aluminum intermetallic compound bar in a vacuum environment for cooling, and taking out after completely cooling to room temperature.
Furthermore, pure titanium is selected as an additive substrate in the additive process, the thickness of the substrate is larger than 15mm, the influence of substrate deformation on the additive process is reduced, pure aluminum and pure titanium are selected as wire materials, and the diameter of each wire material is 1.2mm-3.0 mm.
Furthermore, the angle setting range of the wire feeding gun is 30-60 degrees, wires at the intersection points of the wires are placed up and down, the intersection points are positioned in the molten pool, and the aluminum wires are placed under other wires due to the low-melting-point characteristic of the aluminum wires, so that the aluminum wires are ensured to enter the molten pool.
Furthermore, the accelerating voltage is 60kV to 150kV, the working height of the platform is 250 mm to 270mm, the focusing beam current is 1100-1200mA, the scanning frequency of the electron beam is 300Hz to 800Hz, the scanning range of the electron beam is 300 percent to 900 percent of the focus, and the vacuum degree of the working environment is lower than 7 multiplied by 10-2Pa。
Further, the substrate is preheated in a stepped mode, the preheating beam current starts from 5mA, and 5mA is increased every time until the substrate preheating area is red hot. The diameter of the preheating area of the substrate is obviously larger than that of the titanium-aluminum metal compound bar.
Furthermore, the wire feeding speed of the titanium wire and the aluminum wire is in the range of 200-500mm/min, the deposition speed is in the range of 200-500mm/min, and the single-layer thickness is kept at 300-500 μm.
Furthermore, the atomic percentage of the designed components of the titanium-aluminum intermetallic compound is 7-8% higher than that of the actual components, because the electron beam has high energy density and high central temperature, and the element evaporation phenomenon exists.
Furthermore, the beam current of the electron beam is 20-30% higher than that of the normal process so as to ensure that the titanium-aluminum intermetallic compound is kept in an overheated state. Meanwhile, the electron beam continuously works to scan at a high speed, so that the energy loss of radiation heat dissipation is reduced, heat accumulation is realized, the heat loss is mainly changed into contact heat transfer, and a directional temperature gradient is formed.
Furthermore, the difference between the components of the substrate and the components of the titanium-aluminum intermetallic compound bar is large, a transition layer of 10-15mm needs to be reserved in the material increase process, and the transition layer is cut off after the material increase is finished.
Further, the titanium-aluminum intermetallic compound bar is cooled in a vacuum environment by adopting a two-step method,under high vacuum condition (< 7X 10)-2Pa) for 3-4 hours, and cooling to room temperature under a low vacuum degree environment (0.1-1 Pa).
Example 1
The titanium-aluminum intermetallic compound in-situ additive directional solidification method is characterized in that an electron beam dual-wire or multi-wire additive manufacturing system is adopted in the method, and the method comprises the following steps:
(1) carrying out pretreatment work such as polishing and cleaning on a substrate, clamping and fixing, determining the angle of a wire feeding gun, and then putting a working platform into a vacuum chamber and vacuumizing;
(2) setting parameters such as accelerating voltage, working height, focusing beam current, electron beam scanning frequency, electron beam scanning range and the like according to requirements, calculating and setting corresponding wire feeding speed according to components of the titanium-aluminum intermetallic compound;
(3) preheating the substrate according to the size of the actual titanium-aluminum intermetallic compound in-situ additive directional solidification component;
(4) the electron beam is shot on the substrate according to set parameters, the wire feeding is carried out after the wire flow is stabilized, the wire flow is continuously carried out after the wire enters the same molten pool, the deposition is carried out according to a set program, the working platform is slowly reduced after the deposition of one layer is finished until the size of the in-situ material adding component meets the requirement, and the electron beam is closed after the wire feeding is stopped;
(5) and (3) placing the titanium-aluminum intermetallic compound bar in a vacuum environment for cooling, and taking out after completely cooling to room temperature.
Wherein the selected substrate is a pure titanium substrate, and the wire material is selected from pure titanium wires and pure aluminum wires with the diameter of 1.6 mm. The angle of the wire feeding gun is 50 degrees, and the working vacuum degree in the material increase process is 3 multiplied by 10-2Pa, the wire feeding speeds of the titanium wire and the aluminum wire are respectively 300mm/min and 430mm/min, and the deposition speed is 200 mm/min. Basic parameters for preheating the substrate are as follows: the accelerating voltage is 60kV, the focusing current is 1141mA, the scanning frequency is 300Hz, the scanning range is 300 percent, the scanning mode is circular, and the scanning speed is 10 mm/s. The preheating mode adopts step preheating, namely preheating beam current is gradually increased from 5mm to 25mm until the substrate is red hot, namely preheating is finished. The additive process parameters are as follows: acceleration voltage 60kV and focusing current 1141mA, the scanning frequency is 600Hz, the scanning range is 600%, the scanning mode is circular, the single-layer height is 450 mu m, and the beam current of the electron beam is 30 mA. The cooling process of the additive component needs to be carried out in a vacuum environment by adopting sectional cooling, namely cooling for 3 hours under high vacuum degree and preserving heat for 10 hours under low vacuum degree, wherein the high vacuum range is 5 multiplied by 10-2Pa, low vacuum range of 0.5 Pa. By the method of this example, a well-formed directionally solidified titanium-aluminum intermetallic compound member was obtained. FIG. 1 is a dendrite morphology diagram of a titanium-aluminum intermetallic compound in-situ additive directionally solidified component, and FIG. 2 is an EBSD diagram of the titanium-aluminum intermetallic compound in-situ additive directionally solidified component. It can be seen from the figure that dendrites grow directionally and there are no transverse grain boundaries.
The directional solidification of the titanium-aluminum intermetallic compound has many problems, such as difficult preparation of components with complex shapes, easy introduction of impurities, low production efficiency and the like. The titanium-aluminum intermetallic compound material prepared by the additive manufacturing method has the advantages of high processing efficiency, capability of preparing a complex component and difficulty in introducing impurity elements. However, the adoption of additive manufacturing to prepare the directionally solidified material has more problems: 1. means for directionally solidifying the temperature field; 2. the intrinsic brittleness of the titanium-aluminum intermetallic compound component can generate large additive stress in the repeated heating process, so that the titanium-aluminum intermetallic compound component is very easy to crack. The above two problems are not solved, and the present invention adopts the following method.
The directional solidification of the titanium-aluminum intermetallic compound is realized by utilizing the special material characteristics of the material and the special temperature field in the electron beam fuse material increasing process. The titanium-aluminum alloy has a thermal conductivity of 12W/(m.K), and compared with other materials, the titanium-aluminum alloy has lower thermal conductivity and poor thermal conductivity, and is easy to cause heat accumulation effect in the material increasing process; the electron beam fuse wire additive manufacturing is an additive process method which is carried out in a vacuum environment, the heat dissipation mode is contact heat transfer and radiation heat transfer, the radiation heat transfer accounts for 5% of the total heat dissipation, the radiation heat transfer can be changed into a fixed value through a series of methods, and therefore the directional solidification temperature field of the component is facilitated. In order to reduce the cracking phenomenon caused by stress, the substrate is fixed on the material increase tool, the substrate preheating mode is adopted, the temperature of the substrate is increased, and the temperature difference between a molten pool and a base is reduced, so that the cooling rate is reduced, and the material increase stress is reduced. Meanwhile, after the material increase is finished, the material is placed in a vacuum chamber for two-step cooling, so that the cooling efficiency is improved, and the possibility of component cracking is avoided.

Claims (10)

1. The titanium-aluminum intermetallic compound in-situ additive directional solidification method is characterized in that an electron beam dual-wire or multi-wire additive manufacturing system is adopted in the method, and the method comprises the following steps:
(1) carrying out pretreatment work such as polishing and cleaning on a substrate, clamping and fixing, determining the angle of a wire feeding gun, and then putting a working platform into a vacuum chamber and vacuumizing;
(2) setting parameters such as accelerating voltage, working height, focusing beam current, electron beam scanning frequency, electron beam scanning range and the like according to requirements, calculating and setting corresponding wire feeding speed according to components of the titanium-aluminum intermetallic compound;
(3) preheating the substrate according to the size of the actual titanium-aluminum intermetallic compound in-situ additive directional solidification component;
(4) the electron beam is shot on the substrate according to set parameters, the wire feeding is carried out after the wire flow is stabilized, the wire flow is continuously carried out after the wire enters the same molten pool, the deposition is carried out according to a set program, the working platform is slowly reduced after the deposition of one layer is finished until the size of the in-situ material adding component meets the requirement, and the electron beam is closed after the wire feeding is stopped;
(5) and (3) placing the titanium-aluminum intermetallic compound bar in a vacuum environment for cooling, and taking out after completely cooling to room temperature.
2. The method for in-situ additive-directional solidification of the titanium-aluminum intermetallic compound as claimed in claim 1, wherein pure titanium is selected as the additive substrate in the additive process, the thickness of the substrate is larger than 15mm, the influence of substrate deformation on the additive process is reduced, pure aluminum and pure titanium are selected as the wire materials, and the diameter of the wire material is 1.2mm-3.0 mm.
3. The method of claim 1, wherein the setting range of the wire feeding gun angle is 30-60 °, the wires at the intersection point of the wires are placed up and down and the intersection point is located in the molten pool, wherein the aluminum wire is placed under the other wires due to its low melting point characteristic, and the aluminum wire is ensured to enter the molten pool.
4. The in-situ additive-directional solidification method for intermetallic Ti-Al compound as claimed in claim 1, wherein the acceleration voltage is 60 kV-150 kV, the working height of the platform is 250-270 mm, the focused beam current is 1100-1200mA, the scanning frequency of the electron beam is 300-800 Hz, the scanning range of the electron beam is 300-900% of the focus, and the vacuum degree of the working environment is lower than 7 x 10-2Pa。
5. The in-situ additive-directional solidification method for the titanium-aluminum intermetallic compound according to claim 1, characterized in that the preheating of the substrate is performed in a stepped manner, and the preheating beam current is increased by 5mA each time from 5mA until the preheating area of the substrate is red hot; the diameter of the preheating area of the substrate is larger than that of the titanium-aluminum metal compound bar.
6. The method as claimed in claim 1, wherein the wire feeding speed of the titanium wire and the aluminum wire is 200-500mm/min, the deposition speed is 200-500mm/min, and the single-layer thickness is 300-500 μm.
7. The method of claim 1, wherein the atomic percentage of the designed component of the intermetallic titanium-aluminum compound is 7-8% higher than the actual component.
8. The in-situ additive-directional solidification method of an intermetallic titanium-aluminum compound according to claim 1, wherein the electron beam current is 20-30% higher than the normal process conditions.
9. The in-situ additive directional solidification method for the titanium-aluminum intermetallic compound according to claim 1, wherein the difference between the components of the substrate and the components of the titanium-aluminum intermetallic compound bar is large, a transition layer of 10-15mm needs to be reserved in the additive process, and the transition layer is cut off after the additive is finished.
10. The in-situ additive-directional solidification method for the intermetallic titanium-aluminum compound according to claim 1, wherein the intermetallic titanium-aluminum compound bar is cooled in a vacuum environment by a two-step method, and the cooling is performed in a high vacuum environment at a temperature of less than 7 x 10-2Cooling Pa for 3-4 hours, and cooling to room temperature at 0.1-1 Pa in a low vacuum degree environment.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113118606A (en) * 2021-03-29 2021-07-16 中国商用飞机有限责任公司北京民用飞机技术研究中心 Electron beam fuse material additive manufacturing method for large titanium-aluminum alloy component
CN113878263A (en) * 2021-10-13 2022-01-04 中国航发北京航空材料研究院 Wire for TA15 titanium alloy additive manufacturing through electron beam fuses and preparation method
CN114273768A (en) * 2022-01-19 2022-04-05 哈尔滨工业大学 Electron beam multi-filament collaborative additive manufacturing device and method
CN117405484A (en) * 2023-10-13 2024-01-16 哈尔滨工业大学 Variable cross-section test piece for evaluating directional growth capability of TiAl-based alloy and preparation method thereof

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