CN112658268A - Rare earth modified TiAl alloy powder for additive manufacturing and preparation method thereof - Google Patents
Rare earth modified TiAl alloy powder for additive manufacturing and preparation method thereof Download PDFInfo
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Abstract
The invention discloses rare earth modified TiAl alloy powder for additive manufacturing and a preparation method thereof, wherein the rare earth elements in the rare earth modified TiAl alloy powder are Sc and Zr, wherein the mass percent of Sc is 0.1-0.4%, and the mass percent of Zr is 0.1-0.3%. Sc is a modification treatment agent of aluminum alloy, has higher activity, Al element preferentially reacts with rare earth element to form rare earth compound, so that Al equivalent is reduced, elements forming brittle phases are reduced, and the quantity of the brittle phases is reduced; zr is added into the Sc-containing TiAl alloy, the Zr and Sc are jointly used as a modification treatment agent to form A13(Sc1-xZrx) particles, the alloy performance can be effectively improved, and the addition of Zr can also reduce the addition of Sc element, thereby reducing the material cost. The preparation method has simple process and low cost, and is suitable for mass production.
Description
Technical Field
The invention relates to the technical field of additive manufacturing, in particular to rare earth modified TiAl alloy powder for additive manufacturing and a preparation method thereof.
Background
The additive manufacturing technology is one of rapid prototyping technologies, and is a technology for constructing a three-dimensional part by using a three-dimensional model as a base and using a bondable material such as metal powder or plastic and the like in a mode of scanning layer by layer and stacking layer by layer. The additive Manufacturing technology combines various disciplines such as Computer Aided Design/Computer Aided Manufacturing, optics, numerical control and material science, has wide application fields, and has application prospects in jewelry, medical treatment, shoes, industrial Design, building, aerospace, automobiles, education and the like.
The TiAl alloy belongs to intermetallic compound materials, has the density half that of nickel-based high-temperature alloy, has excellent performances of high melting point, high specific strength, high specific modulus, high oxidation resistance, creep resistance and the like, and is a novel light high-temperature structural material which can replace part of high-temperature alloy and is applied to heat-end components of aerospace and the like. However, the room temperature plasticity of the TiAl alloy is low due to the room temperature brittleness of the TiAl alloy, and the practical application of the TiAl-based alloy is seriously hindered.
Disclosure of Invention
The invention provides rare earth modified TiAl alloy powder for additive manufacturing and a preparation method thereof, which are used for overcoming the defects of low room temperature plasticity and the like of a TiAl alloy powder material additive manufactured formed part in the prior art.
In order to achieve the purpose, the invention provides rare earth modified TiAl alloy powder for additive manufacturing, wherein the rare earth elements in the rare earth modified TiAl alloy powder are Sc and Zr, wherein the mass percent of Sc is 0.1-0.4%, and the mass percent of Zr is 0.1-0.3%.
In order to achieve the above object, the present invention further provides a method for preparing a rare earth-modified TiAl alloy powder for additive manufacturing, comprising:
s1: selecting a TiAl alloy, weighing 0.1-0.3% of Zr simple substance and 0.1-0.4% of Al-Sc intermediate alloy corresponding to Sc element according to mass percent, and pretreating the TiAl alloy, the Zr simple substance and the Al-Sc intermediate alloy;
s2: smelting the TiAl alloy by adopting a TiAl alloy atomization process, adding the Zr simple substance and the Al-Sc intermediate alloy in the smelting process, and atomizing after the TiAl alloy, the Zr simple substance and the Al-Sc intermediate alloy are smelted and mixed to obtain powder;
s3: and grading the powder according to the requirement of additive manufacturing powder to obtain the rare earth modified TiAl alloy powder with the particle size of 15-53 mu m.
Compared with the prior art, the invention has the beneficial effects that:
1. the rare earth elements in the rare earth modified TiAl alloy powder are Sc and Zr, wherein the mass percent of Sc is 0.1-0.4%, and the mass percent of Zr is 0.1-0.3%. The rare earth element Sc is a modification treatment agent of aluminum alloy and has higher activity, Al element preferentially reacts with the rare earth element to form a rare earth compound, so that the equivalent of Al is reduced, the elements forming brittle phases are reduced, and the quantity of the brittle phases is reduced. On the other hand, the preferential generation of rare earth compounds can reduce nucleation barriers, become heterogeneous nucleation cores, increase the nucleation rate and further refine grains. In addition, the formed rare earth phase is dispersed in the matrix, so that the growth of grains can be prevented, and the fine grain structure of the rare earth phase is kept, thereby improving the comprehensive mechanical property of the TiAl alloy. Meanwhile, a certain amount of transition metal Zr is added into the Sc-containing TiAl alloy, Zr and Sc are used as modification agents together, Zr can form A13(Sc1-xZrx) particles with Al and Sc, the particles can effectively improve the alloy performance, and the addition of Zr can also reduce the addition of Sc, so that the material cost is reduced.
2. The rare earth element doping amount in the rare earth modified TiAl alloy powder provided by the invention is low, so that the processing can be carried out by continuously using the original TiAl powder material additive manufacturing process parameters in the additive manufacturing, the compactness and the surface roughness of a formed part are not influenced, and the process exploration is not required to be carried out again.
3. The rare earth modified TiAl alloy powder provided by the invention is suitable for an additive manufacturing technology, the additive manufacturing process is a rapid solidification process, the rare earth elements can be dissolved to the maximum extent, the grain refining effect is more obvious, and a formed part has more excellent comprehensive mechanical properties.
4. The preparation method of the rare earth modified TiAl alloy powder for additive manufacturing, provided by the invention, has the advantages of simple process and low cost, and is suitable for mass production.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a flow chart of a method for preparing rare earth modified TiAl alloy powder for additive manufacturing according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The drugs/reagents used are all commercially available without specific mention.
The invention provides rare earth modified TiAl alloy powder for additive manufacturing, wherein rare earth elements in the rare earth modified TiAl alloy powder are Sc and Zr, wherein the mass percent of Sc is 0.1-0.4%, and the mass percent of Zr is 0.1-0.3%.
Preferably, the mass percent of the rare earth elements Sc and Zr is 2: 1. The rare earth element Sc is a modification treatment agent of aluminum alloy and has higher activity, Al element preferentially reacts with the rare earth element to form a rare earth compound, so that the equivalent of Al is reduced, the elements forming brittle phases are reduced, and the quantity of the brittle phases is reduced. On the other hand, the preferential generation of rare earth compounds can reduce nucleation barriers, become heterogeneous nucleation cores, increase the nucleation rate and further refine grains. In addition, the formed rare earth phase is dispersed in the matrix, so that the growth of grains can be prevented, and the fine grain structure of the rare earth phase is kept, thereby improving the comprehensive mechanical property of the TiAl alloy. Meanwhile, a certain amount of transition metal Zr is added into the Sc-containing TiAl alloy, Zr and Sc are used as modification agents together, Zr can form A13(Sc1-xZrx) particles with Al and Sc, the particles can effectively improve the alloy performance, and the addition of Zr can also reduce the addition of Sc, so that the material cost is reduced.
Preferably, the TiAl alloy in the rare earth modified TiAl alloy powder is one of Ti-48Al-2Cr-2Nb, Ti-43.5Al-4Nb-1Mo-0.1B and Ti-45Al-8 Nb.
The invention also provides a preparation method of the rare earth modified TiAl alloy powder for additive manufacturing, which comprises the following steps of:
s1: selecting a TiAl alloy, weighing 0.1-0.3% of Zr simple substance and 0.1-0.4% of Al-Sc intermediate alloy corresponding to Sc element according to mass percent, and pretreating the TiAl alloy, the Zr simple substance and the Al-Sc intermediate alloy;
s2: smelting the TiAl alloy by adopting a TiAl alloy atomization process, adding the Zr simple substance and the Al-Sc intermediate alloy in the smelting process, and atomizing after the TiAl alloy, the Zr simple substance and the Al-Sc intermediate alloy are smelted and mixed to obtain powder;
s3: and grading the powder according to the requirement of additive manufacturing powder to obtain the rare earth modified TiAl alloy powder with the particle size of 15-53 mu m.
Preferably, in step S1, the preprocessing specifically includes:
and performing oxide film removal and ultrasonic washing on the TiAl alloy, the Zr simple substance and the Al-Sc intermediate alloy, drying for 3h at 120 ℃, and cooling. So as to ensure the purity of the raw materials and reduce the introduction of impurities.
Preferably, in step S1, the purity of the TiAl alloy is more than or equal to 99.9%.
Preferably, the step S2 is specifically:
s21: pretreating the smelting chamber and the crucible to reduce the influence of water in the smelting furnace on the smelting process;
s22: placing the TiAl alloy in a crucible in an intermediate frequency furnace, preheating the TiAl alloy, vacuumizing a smelting chamber while preheating, wherein the vacuum degree of the smelting chamber reaches 1 multiplied by 10-2After pa is lower, argon is filled into the smelting chamber until the pressure of the smelting chamber is the same as the atmospheric pressure, and the argon filling is stopped;
preheating enables the pure TiAl alloy to release gas inclusions, and high-purity argon can replace the gas inclusions in the smelting chamber.
S23: heating the smelting chamber to 1200-1400 ℃ to smelt the TiAl alloy, introducing argon into the smelting chamber again after the TiAl alloy starts to melt so as to enable the pressure of the smelting chamber to be 0.6-0.9 MPa, and preserving heat for 10-25 min at 1200-1400 ℃;
s24: adding a Zr simple substance and an Al-Sc intermediate alloy into the crucible from a secondary feeding port, and preserving heat for 5-10 min at 1200-1400 ℃ after the Zr simple substance and the Al-Sc intermediate alloy are completely melted;
s25: and after the TiAl alloy, the Zr simple substance and the Al-Sc intermediate alloy are completely melted, keeping the temperature of the crucible at 1100 ℃, and pulverizing by adopting a gas atomization pulverizing mode to obtain powder.
The addition amounts of the Zr simple substance and the Al-Sc intermediate alloy are small, so that the Ti-Al alloy is firstly melted, and then the Zr simple substance and the Al-Sc intermediate alloy are melted, thereby avoiding element loss.
Preferably, in step S21, the pretreatment of the melting chamber and the crucible is specifically:
wiping the inner wall of the smelting chamber and the crucible by using cleaning cloth wetted by alcohol.
Preferably, in step S22, the preheating temperature is 350 to 450 ℃, and the preheating time is 5 to 20 min.
Preferably, in step S25, the atomizing gas pressure is 1.0 to 4.5MPa during the gas atomizing milling process, and the smelting chamber pressure is maintained at 9 to 11KPa or higher. The volatilization of elements in the atomization process is reduced on the basis of ensuring the smooth flowing of the melt.
Example 1
The present embodiment provides a rare earth-modified TiAl alloy powder for additive manufacturing, in which rare earth elements are Sc and Zr, where Sc is 0.3 mass%, and Zr is 0.15 mass%.
The embodiment also provides a preparation method of the rare earth modified TiAl alloy powder for additive manufacturing, which includes:
1) the TiAl alloy uses high-purity Ti-48Al-2Cr-2Nb master alloy ingot metal, and 0.15 percent of Zr simple substance and 0.3 percent of Al-Sc intermediate alloy corresponding to Sc element are weighed according to mass percentage. Before feeding, performing oxide film removal and ultrasonic washing on the TiAl alloy, the Zr simple substance and the Al-Sc intermediate alloy, and drying for 3h in a vacuum drying oven at 120 ℃. So as to ensure the purity of the raw materials and reduce the introduction of impurities.
2) Wiping the inner wall of the smelting chamber and the crucible by using cleaning cloth wetted by alcohol. The purpose is to reduce the influence of water in the smelting furnace on the smelting process.
3) Adding a high-purity Ti-48Al-2Cr-2Nb master alloy ingot into a crucible in an intermediate frequency furnace, and preheating the master alloy ingot at the preheating temperature of 400 ℃ for 10 min. Preheating enables the high-purity Ti-48Al-2Cr-2Nb master alloy ingot to release the occluded gas, and the high-purity argon can replace the occluded gas in the smelting chamber. The smelting chamber is vacuumized while preheating, and the vacuum degree of the smelting chamber reaches 1 multiplied by 10-2pa or below, to the smelting chamberHigh-purity argon is filled in the smelting chamber, so that the pressure of the smelting chamber is the same as the atmospheric pressure.
4) And raising the temperature of the smelting chamber to 1300 ℃, melting the Ti-48Al-2Cr-2Nb master alloy ingot, introducing argon into the smelting chamber again after the melting is started, ensuring the pressure of the smelting chamber to be 0.6-0.9 MPa, and preserving the temperature at 1300 ℃ for 20 min.
5) And adding a Zr simple substance and an Al-Sc intermediate alloy into the crucible from a secondary feeding port, and preserving the heat for 7min at 1300 ℃ after the Zr simple substance and the Al-Sc intermediate alloy are completely melted.
6) After all the raw materials are completely melted, the crucible temperature is kept at 1100 ℃, and powder is prepared by adopting a gas atomization powder preparation method. The pressure of the atomizing gas is controlled within the range of 1.0-4.5 MPa. The air pressure of the smelting chamber is kept above 9-11 KPa. The volatilization of elements in the atomization process is reduced on the basis of ensuring the smooth flow of the melt.
7) And large-flow cooling water is introduced into the atomizing barrel and the powder collecting tank, so that the cooling rate of the powder is ensured. And (4) atomizing for 10-20 min, and after the atomization is finished, waiting for the temperature reduction of the powder to finish the powder preparation.
8) And taking out the cooled powder, screening and grading the powder by using a vibration screening device, wherein the upper limit and the lower limit are respectively 15 micrometers and 53 micrometers, and obtaining a rare earth modified TiAl alloy powder finished product with the particle size of 15-53 micrometers after screening.
The rare earth modified TiAl alloy powder prepared by the embodiment is subjected to additive manufacturing by adopting Ranitsch metal additive manufacturing equipment and Ti-48Al-2Cr-2Nb powder process parameter packages, so that the density of the obtained molded sample piece can reach over 99.95 percent and is consistent with that of a conventional TiAl material. The shaped parts are subsequently heat-treated at 1340 ℃ for 2h and subsequently subjected to tensile tests for mechanical properties at room temperature. The result shows that the room temperature strength of the Ti-48Al-2Cr-2Nb modified by 0.3 percent of Sc and 0.15 percent of Zr is improved from 450MPa to 480MPa, and the elongation after fracture is improved from 1.0 percent to 3 percent. The comprehensive mechanical property of the TiAl forming piece is improved by Sc and Zr element modification.
Example 2
The present embodiment provides a rare earth-modified TiAl alloy powder for additive manufacturing, in which rare earth elements are Sc and Zr, where Sc is 0.2 mass%, and Zr is 0.1 mass%.
The embodiment also provides a preparation method of the rare earth modified TiAl alloy powder for additive manufacturing, which includes:
1) the TiAl alloy uses high-purity Ti-48Al-2Cr-2Nb master alloy ingot metal, and 0.1 percent of Zr simple substance and 0.2 percent of Al-Sc intermediate alloy corresponding to Sc element are weighed according to mass percentage. Before feeding, performing oxide film removal and ultrasonic washing on the TiAl alloy, the Zr simple substance and the Al-Sc intermediate alloy, and drying for 3h in a vacuum drying oven at 120 ℃. So as to ensure the purity of the raw materials and reduce the introduction of impurities.
2) Wiping the inner wall of the smelting chamber and the crucible by using cleaning cloth wetted by alcohol. The purpose is to reduce the influence of water in the smelting furnace on the smelting process.
3) Adding a high-purity Ti-48Al-2Cr-2Nb master alloy ingot into a crucible in an intermediate frequency furnace, and preheating the master alloy ingot at the preheating temperature of 350 ℃ for 20 min. Preheating enables the high-purity Ti-48Al-2Cr-2Nb master alloy ingot to release the occluded gas, and the high-purity argon can replace the occluded gas in the smelting chamber. The smelting chamber is vacuumized while preheating, and the vacuum degree of the smelting chamber reaches 1 multiplied by 10-2And pa, filling high-purity argon into the smelting chamber to ensure that the pressure of the smelting chamber is the same as the atmospheric pressure.
4) And raising the temperature of the smelting chamber to 1200 ℃ to melt the Ti-48Al-2Cr-2Nb master alloy ingot, introducing argon into the smelting chamber again after the melting is started, keeping the pressure of the smelting chamber at 0.6-0.9 MPa, and keeping the temperature at 1200 ℃ for 25 min.
5) And adding a Zr simple substance and an Al-Sc intermediate alloy into the crucible from a secondary feeding port, and preserving the heat for 10min at 1200 ℃ after the Zr simple substance and the Al-Sc intermediate alloy are completely melted.
6) After all the raw materials are completely melted, the crucible temperature is kept at 1100 ℃, and powder is prepared by adopting a gas atomization powder preparation method. The pressure of the atomizing gas is controlled within the range of 1.0-4.5 MPa. The air pressure of the smelting chamber is kept above 9-11 KPa. The volatilization of elements in the atomization process is reduced on the basis of ensuring the smooth flow of the melt.
7) And large-flow cooling water is introduced into the atomizing barrel and the powder collecting tank, so that the cooling rate of the powder is ensured. And (4) atomizing for 10-20 min, and after the atomization is finished, waiting for the temperature reduction of the powder to finish the powder preparation.
8) And taking out the cooled powder, screening and grading the powder by using a vibration screening device, wherein the upper limit and the lower limit are respectively 15 micrometers and 53 micrometers, and obtaining a rare earth modified TiAl alloy powder finished product with the particle size of 15-53 micrometers after screening.
The rare earth modified TiAl alloy powder prepared by the embodiment can be well applied to additive manufacturing.
Example 3
The present embodiment provides a rare earth-modified TiAl alloy powder for additive manufacturing, in which rare earth elements are Sc and Zr, where Sc is 0.4 mass%, and Zr is 0.2 mass%.
The embodiment also provides a preparation method of the rare earth modified TiAl alloy powder for additive manufacturing, which includes:
1) the TiAl alloy uses high-purity Ti-48Al-2Cr-2Nb master alloy ingot metal, and 0.2 percent of Zr simple substance and 0.4 percent of Al-Sc intermediate alloy corresponding to Sc element are weighed according to mass percentage. Before feeding, performing oxide film removal and ultrasonic washing on the TiAl alloy, the Zr simple substance and the Al-Sc intermediate alloy, and drying for 3h in a vacuum drying oven at 120 ℃. So as to ensure the purity of the raw materials and reduce the introduction of impurities.
2) Wiping the inner wall of the smelting chamber and the crucible by using cleaning cloth wetted by alcohol. The purpose is to reduce the influence of water in the smelting furnace on the smelting process.
3) Adding a high-purity Ti-48Al-2Cr-2Nb master alloy ingot into a crucible in an intermediate frequency furnace, and preheating the master alloy ingot at the preheating temperature of 450 ℃ for 5 min. Preheating enables the high-purity Ti-48Al-2Cr-2Nb master alloy ingot to release the occluded gas, and the high-purity argon can replace the occluded gas in the smelting chamber. The smelting chamber is vacuumized while preheating, and the vacuum degree of the smelting chamber reaches 1 multiplied by 10-2And pa, filling high-purity argon into the smelting chamber to ensure that the pressure of the smelting chamber is the same as the atmospheric pressure.
4) And raising the temperature of the smelting chamber to 1400 ℃, melting the Ti-48Al-2Cr-2Nb master alloy ingot, introducing argon into the smelting chamber again after the melting is started, keeping the pressure of the smelting chamber at 0.6-0.9 MPa, and keeping the temperature at 1400 ℃ for 10 min.
5) And adding a Zr simple substance and an Al-Sc intermediate alloy into the crucible from a secondary feeding port, and preserving the heat for 5min at 1400 ℃ after the Zr simple substance and the Al-Sc intermediate alloy are completely melted.
6) After all the raw materials are completely melted, the crucible temperature is kept at 1100 ℃, and powder is prepared by adopting a gas atomization powder preparation method. The pressure of the atomizing gas is controlled within the range of 1.0-4.5 MPa. The air pressure of the smelting chamber is kept above 9-11 KPa. The volatilization of elements in the atomization process is reduced on the basis of ensuring the smooth flow of the melt.
7) And large-flow cooling water is introduced into the atomizing barrel and the powder collecting tank, so that the cooling rate of the powder is ensured. And (4) atomizing for 10-20 min, and after the atomization is finished, waiting for the temperature reduction of the powder to finish the powder preparation.
8) And taking out the cooled powder, screening and grading the powder by using a vibration screening device, wherein the upper limit and the lower limit are respectively 15 micrometers and 53 micrometers, and obtaining a rare earth modified TiAl alloy powder finished product with the particle size of 15-53 micrometers after screening.
The rare earth modified TiAl alloy powder prepared by the embodiment can be well applied to additive manufacturing.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The rare earth modified TiAl alloy powder for additive manufacturing is characterized in that rare earth elements in the rare earth modified TiAl alloy powder are Sc and Zr, wherein the mass percent of Sc is 0.1-0.4%, and the mass percent of Zr is 0.1-0.3%.
2. The rare earth-modified TiAl alloy powder for additive manufacturing according to claim 1, wherein the mass percentage of the rare earth elements Sc and Zr is 2: 1.
3. The rare earth-modified TiAl alloy powder for additive manufacturing of claim 1, wherein the TiAl alloy in the rare earth-modified TiAl alloy powder is one of Ti-48Al-2Cr-2Nb, Ti-43.5Al-4Nb-1Mo-0.1B, and Ti-45Al-8 Nb.
4. A preparation method of rare earth modified TiAl alloy powder for additive manufacturing is characterized by comprising the following steps:
s1: selecting a TiAl alloy, weighing 0.1-0.3% of Zr simple substance and 0.1-0.4% of Al-Sc intermediate alloy corresponding to Sc element according to mass percent, and pretreating the TiAl alloy, the Zr simple substance and the Al-Sc intermediate alloy;
s2: smelting the TiAl alloy by adopting a TiAl alloy atomization process, adding the Zr simple substance and the Al-Sc intermediate alloy in the smelting process, and atomizing after the TiAl alloy, the Zr simple substance and the Al-Sc intermediate alloy are smelted and mixed to obtain powder;
s3: and grading the powder according to the requirement of additive manufacturing powder to obtain the rare earth modified TiAl alloy powder with the particle size of 15-53 mu m.
5. The method for preparing rare earth-modified TiAl alloy powder for additive manufacturing according to claim 4, wherein in step S1, the pretreatment is specifically:
and performing oxide film removal and ultrasonic washing on the TiAl alloy, the Zr simple substance and the Al-Sc intermediate alloy, drying for 3h at 120 ℃, and cooling.
6. The method for preparing rare earth modified TiAl alloy powder for additive manufacturing according to claim 4 or 5, wherein the purity of the TiAl alloy is greater than or equal to 99.9% in step S1.
7. The method for preparing rare earth modified TiAl alloy powder for additive manufacturing according to claim 4, wherein the step S2 specifically comprises:
s21: pretreating the smelting chamber and the crucible;
s22: placing the TiAl alloy in a crucible in an intermediate frequency furnace, preheating the TiAl alloy, vacuumizing a smelting chamber while preheating, wherein the vacuum degree of the smelting chamber reaches 1 multiplied by 10-2After pa is lower, argon is filled into the smelting chamber until the pressure of the smelting chamber is the same as the atmospheric pressure, and the argon filling is stopped;
s23: heating the smelting chamber to 1200-1400 ℃ to smelt the TiAl alloy, introducing argon into the smelting chamber again after the TiAl alloy starts to melt so as to enable the pressure of the smelting chamber to be 0.6-0.9 MPa, and preserving heat for 10-25 min at 1200-1400 ℃;
s24: adding a Zr simple substance and an Al-Sc intermediate alloy into the crucible from a secondary feeding port, and preserving heat for 5-10 min at 1200-1400 ℃ after the Zr simple substance and the Al-Sc intermediate alloy are completely melted;
s25: and after the TiAl alloy, the Zr simple substance and the Al-Sc intermediate alloy are completely melted, keeping the temperature of the crucible at 1100 ℃, and pulverizing by adopting a gas atomization pulverizing mode to obtain powder.
8. The method for preparing rare earth-modified TiAl alloy powder for additive manufacturing according to claim 7, wherein in step S21, the pretreatment of the melting chamber and the crucible is specifically:
wiping the inner wall of the smelting chamber and the crucible by using cleaning cloth wetted by alcohol.
9. The method for preparing rare earth-modified TiAl alloy powder for additive manufacturing according to claim 7, wherein in step S22, the preheating temperature is 350-450 ℃ and the preheating time is 5-20 min.
10. The method for preparing rare earth modified TiAl alloy powder for additive manufacturing according to claim 7, wherein in step S25, the atomizing gas pressure is 1.0-4.5 MPa and the smelting chamber pressure is maintained at 9-11 KPa or above during the gas atomizing pulverization process.
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| CN106238954A (en) * | 2016-07-29 | 2016-12-21 | 安徽飞弧焊业股份有限公司 | A kind of rare earth modified aluminium alloy welding wire and preparation method thereof |
| CN110643877A (en) * | 2019-09-09 | 2020-01-03 | 中国航发北京航空材料研究院 | TiAl intermetallic compound containing W, Mn, Si, B, C and rare earth elements |
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| CN113755739B (en) * | 2021-09-22 | 2022-04-22 | 天津大学 | Method for improving mechanical property of additive manufactured austenitic steel |
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