CN111560531B - Preparation method of low-oxide-inclusion high-performance powder metallurgy nickel-based high-temperature alloy - Google Patents
Preparation method of low-oxide-inclusion high-performance powder metallurgy nickel-based high-temperature alloy Download PDFInfo
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- 239000000956 alloy Substances 0.000 title claims abstract description 41
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 16
- 238000004663 powder metallurgy Methods 0.000 title claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 76
- 238000005245 sintering Methods 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000032683 aging Effects 0.000 claims abstract description 11
- 238000007731 hot pressing Methods 0.000 claims abstract description 9
- 238000005516 engineering process Methods 0.000 claims abstract description 7
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 6
- 229910052796 boron Inorganic materials 0.000 claims abstract description 6
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 238000009694 cold isostatic pressing Methods 0.000 claims abstract description 6
- 238000009689 gas atomisation Methods 0.000 claims abstract description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 6
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 6
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 6
- 238000005242 forging Methods 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 19
- 238000000889 atomisation Methods 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 10
- 239000011812 mixed powder Substances 0.000 claims description 9
- 229910000601 superalloy Inorganic materials 0.000 claims description 9
- 229910000048 titanium hydride Inorganic materials 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 7
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 238000003754 machining Methods 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 238000007873 sieving Methods 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 10
- 239000001301 oxygen Substances 0.000 abstract description 10
- 229910052760 oxygen Inorganic materials 0.000 abstract description 10
- 238000000280 densification Methods 0.000 abstract description 4
- 239000007769 metal material Substances 0.000 abstract description 2
- 229910052735 hafnium Inorganic materials 0.000 description 7
- 229910052719 titanium Inorganic materials 0.000 description 7
- 229910052715 tantalum Inorganic materials 0.000 description 6
- 101000912561 Bos taurus Fibrinogen gamma-B chain Proteins 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 238000001513 hot isostatic pressing Methods 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 150000004678 hydrides Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/0433—Nickel- or cobalt-based alloys
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- B22F1/0003—
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/001—Starting from powder comprising reducible metal compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
- B22F3/15—Hot isostatic pressing
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/17—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by forging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/056—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 10% but less than 20%
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/248—Thermal after-treatment
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- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
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Abstract
A preparation method of a low-oxide inclusion high-performance powder metallurgy nickel-based high-temperature alloy belongs to the field of metal materials. Firstly, preparing a powder by adopting a vacuum gas atomization powder preparation technology, wherein the mass ratio of the powder is C: 0.16-0.19%, Cr: 9.8-12%, Co: 16.5-17.5%, W: 7.7-8.8%, Mo: 0.65-0.88%, Al: 5.75-6.30%, B: 0.025-0.033%, Zr: 0.055-0.087 percent of Ni and the balance of spherical prealloying powder, and then selecting prealloying powder with certain granularity and TiH with certain content and granularity2TaH and HfH2The powder is uniformly mixed and then is put into a rubber sheath for cold isostatic pressing, then the rubber sheath is removed, the formed blank is put into a high vacuum hot pressing furnace for hot pressing sintering densification according to a certain sintering process, the densified sintered blank is forged or rolled to form a blank part according to the requirement, and finally the part is subjected to aging performance treatment. By adopting the process, the prepared nickel-based high-temperature alloy material has lower oxygen content, and can obtain high endurance strength and high low-cycle fatigue strength.
Description
Technical Field
The invention belongs to the field of metal materials, and relates to a preparation method of a low-oxide inclusion high-performance powder metallurgy nickel-based high-temperature alloy.
Background
The high-temperature alloy has good oxidation resistance, corrosion resistance, excellent tensile property, durability, fatigue property and long-term structure stability, is developed for meeting the requirements of modern aerospace technology under various high-temperature use conditions, and shows strong vitality in the field of advanced aerospace engines. The powder metallurgy high-temperature alloy is prepared by adopting a powder metallurgy method, has the advantages of uniform structure, no macrosegregation, high yield strength, good fatigue performance and the like compared with the traditional cast forging high-temperature alloy, overcomes the segregation (nonuniformity) generated by the conventional process, ensures that each particle of the used pre-alloying powder is a 'micro steel ingot', ensures that the alloy segregation can only occur in a tiny range of the powder particle, can improve the comprehensive performance of the alloy, can reduce the cutting processing amount and improve the utilization rate of the alloy. Particularly, as the components of the high-temperature alloy become more complex and the size of parts is increased, the powder metallurgy high-temperature alloy shows greater superiority.
The basic preparation process of the powder superalloy is that spherical powder is prepared by adopting an air atomization or plasma rotary atomization process, then hot pressing or hot isostatic pressing sintering densification treatment is carried out on the powder, and finally deformation and heat treatment are carried out on a dense sintering blank to obtain the required material or component. The performance of the powder superalloy is closely related to the components, the granularity and the oxygen content of raw material powder, generally, finer powder is helpful for sintering densification to obtain high performance, but when the powder is finer, the oxygen content adsorbed on the surface of the powder is higher, the high oxygen content is easy to form oxide inclusions or oxide films with strengthening elements such as Ti, Nb, Hf and the like in the alloy on the surface of the powder, and is very unfavorable for the low-cycle fatigue performance and the high-temperature endurance performance of the superalloy, so on the basis of optimizing the component design, how to reduce the oxygen content of the powder metallurgy superalloy to obtain high performance is a difficult point and a hot point in the current powder superalloy preparation.
Disclosure of Invention
The invention provides a method for preparing a powder metallurgy high-temperature alloy material with high endurance strength and low cycle fatigue strength by optimizing components and reducing oxygen content.
A preparation method of a low-oxide-inclusion high-performance powder metallurgy nickel-based high-temperature alloy is characterized in that nine elements of C, Cr, W, Mo, Al, B, Zr and Ni are prepared into spherical pre-alloy powder according to a certain mass ratio through a vacuum gas atomization powder preparation technology, then the pre-alloy powder with a certain particle size is selected to be mixed with elements of Ti, Ta and Hf, and the elements of Ti, Ta and Hf are respectively TiH2TaH and HfH2Adding the powder in the form of powder, filling the uniformly mixed powder into a rubber sheath for cold isostatic pressing, removing the rubber sheath, placing the formed blank into a high vacuum hot pressing furnace for hot pressing sintering densification according to a certain sintering process, forging or rolling the densified sintered blank according to requirements to obtain a blank part, and finally performing aging treatment on the part to obtain the high-performance high-strength high-toughness high-strength high-toughnessA nickel base alloy part with durable strength and high and low cycle fatigue strength.
Further, the preparation method comprises the following specific steps:
(1) firstly, preparing spherical pre-alloy powder by adopting a vacuum gas atomization powder preparation technology, wherein the mass ratio of the powder is as follows: c: 0.16-0.19%, Cr: 9.8-12%, Co: 16.5-17.5%, W: 7.7-8.8%, Mo: 0.65-0.88%, Al: 5.75-6.30%, B: 0.025-0.033%, Zr: 0.055-0.087 percent and the balance of Ni, wherein the atomization atmosphere adopts high-purity argon, and the atomization temperature is 1650-1700 ℃.
(2) Sieving the prealloying powder obtained by atomization, and taking the prealloying powder with the grain size range of 10-180 mu m and TiH2TaH and HfH2Mixing the three powders, wherein TiH2The granularity of the powder is 1-5 mu m, and the mass ratio of the powder after mixing is 4.1-4.6%; the particle size of the TaH powder is 1-3 μm, and the mass ratio of the TaH powder in the mixed powder is 2.6-2.85%; HfH2The granularity of the powder is 1-3 mu m, and the mass ratio of the powder after mixing is 1.6-1.85%; the mixed powder is filled into a rubber sheath for cold isostatic pressing forming, and the forming pressure is 200 MPa; and then removing the sheath to obtain a pressed green body.
(3) And placing the green body in a vacuum hot-pressing sintering furnace for sintering and heat preservation, and then cooling to room temperature at a certain rate to obtain a compact sintered green body.
(4) Forging the sintered blank into a required shape by forging deformation, wherein free forging or die forging can be adopted for forging; if the forging does not meet the forming requirements, the rolling needs to be continued.
(5) And carrying out aging heat treatment on the formed part, cooling along with a furnace to obtain a high-temperature alloy material part blank with high endurance strength and fatigue strength, and then carrying out machining treatment according to the surface requirement to finally obtain a finished part.
Further, the sintering heat preservation parameters in the step (3) are as follows: firstly, heating the blank to 295-plus-305 ℃ at 15 ℃/min, preserving the heat for 19-21min, then heating to 690-plus-710 ℃ at 1 ℃/min, preserving the heat for 29-31min, heating to 1340-plus-710 ℃ at 10 ℃/min, preserving the heat for 85-95min, and applying axial pressure of 30-50MPa while preserving the heat. The cooling rate is 50-80 deg.C/min.
Further, the forging temperature in the step (4) is 1200-1250 ℃. The rolling temperature is 1150-1200 ℃.
Further, the aging temperature of the aging heat treatment in the step (5) is 750-800 ℃, and the temperature is kept for 4-6 hours.
By adopting the process, the oxygen content of the prepared high-temperature alloy material is lower than 50ppm, the endurance strength of the prepared high-temperature alloy material at 650 ℃, 100 hours is more than 1150MPa, the endurance strength of the prepared high-temperature alloy material at 750 ℃, 100 hours is more than 780MPa, and the low-cycle fatigue strength of the prepared high-temperature alloy material at 650 ℃ (frequency is 1Hz, and cycle number is 2 multiplied by 104) Over 1150MPa, the comprehensive performance is higher than that of the existing nickel-based high-temperature alloy material.
The high-temperature alloy material prepared by the process has the main advantages that: (1) the strengthening elements Ti, Ta and Hf are added in the form of hydride powder, hydrogen can be released to become Ti, Ta and Hf within the temperature range of 300-700 ℃, the released hydrogen has the reduction effect on the prealloying powder, and the oxygen content of the final alloy can be reduced to be below 50ppm, so that higher fatigue strength is obtained; (2) the hydrogen releasing process increases the sintering activity of the powder, is beneficial to the Ti, Ta and Hf to be completely dissolved in the nickel matrix, and simultaneously improves the density of the sintered body to more than 99.8 percent, which is close to the level of the hot isostatic pressing sintering process widely adopted at present, but the cost of the invention is far lower than the cost level of adopting the hot isostatic pressing sintering; (3) by adopting the alloy components and adding Ti, Ta and Hf in the form of powder, the size of a precipitated gamma ' phase in the alloy is reduced, the precipitation temperature of the gamma ' phase is improved, and the lattice mismatch degree between the gamma ' phase and a substrate is increased, so that the high-temperature performance of the alloy is better.
Detailed Description
Example 1
Preparation of high fatigue strength and durable strength nickel-based powder superalloy rod
Firstly, preparing prealloying powder by adopting a vacuum gas atomization powder preparation technology, wherein the mass ratio of the powder is as follows:
C：0.19％，Cr：12％，Co：17.5％，W：8.8％，Mo：0.88％，Al：6.30％，B：0.033％，Zr: 0.087 percent and the balance of Ni, wherein the atomization atmosphere adopts high-purity argon, and the atomization temperature is 1700 ℃. Then sieving the prealloy powder obtained by atomization, and taking the alloy powder with the particle size range of 10-180 mu m and TiH2TaH and HfH2Mixing the three powders, wherein TiH2The granularity of the powder is 1-5 mu m, and the mass ratio of the powder after mixing is 4.6%; the particle size of the TaH powder is 1-3 μm, and the mass ratio of the TaH powder in the mixed powder is 2.85%; HfH2The granularity of the powder is 1-3 mu m, and the mass ratio of the powder after mixing is 1.85%; and filling the mixed powder into a rubber sheath for cold isostatic pressing at a forming pressure of 200MPa, and removing the sheath to obtain a pressed green body. And (2) placing the blank body in a vacuum hot-pressing sintering furnace for sintering, firstly heating the blank body to 300 ℃ at a speed of 15 ℃/min, preserving heat for 20min, then heating to 700 ℃ at a speed of 1 ℃/min, preserving heat for 30min, then heating to 1350 ℃ at a speed of 10 ℃/min, preserving heat for 90min, applying axial pressure of 50MPa while preserving heat, and then cooling to room temperature at a cooling rate of 80 ℃/min to obtain a compact sintered blank body. And forging and deforming the sintered blank at 1250 ℃, rolling the forged blank at 1200 ℃, rolling the blank into a rod piece with a required size, then performing aging heat treatment at 800 ℃, preserving heat for 6 hours, cooling along with a furnace to obtain a high-temperature alloy material rod piece blank with high endurance strength and fatigue strength, and then performing machining treatment according to the surface requirement to finally obtain a rod piece finished product. Through performance tests, the prepared high-temperature alloy disc has the oxygen content of 45ppm, the endurance strength of 650 ℃ for 100 hours reaches 1190MPa, the endurance strength of 750 ℃ for 100 hours reaches 810MPa, and the low-cycle fatigue strength of 650 ℃ (frequency is 1Hz, and cycle frequency is 2 multiplied by 104) Reaching 1190MPa and the comprehensive performance higher than that of the prior nickel-based high-temperature alloy material.
Example 2
Preparation of high fatigue strength and durable strength nickel-base superalloy disk
Firstly, preparing prealloy powder by adopting a vacuum gas atomization powder preparation technology, wherein the mass ratio of the powder is as follows:
C：0.17％，Cr：10％，Co：17%, W: 8%, Mo: 0.7%, Al: 6%, B: 0.03%, Zr: 0.06 percent and the balance of Ni, wherein the atomization atmosphere adopts high-purity argon, and the atomization temperature is 1650 ℃. Secondly, sieving the prealloy powder obtained by atomization, taking the alloy powder with the particle size range of 10-180 mu m, and then mixing with TiH2TaH and HfH2Mixing the three powders, wherein TiH2The granularity of the powder is 1-5 mu m, and the mass ratio of the powder after mixing is 4.1%; the particle size of the TaH powder is 1-3 μm, and the mass ratio of the TaH powder in the mixed powder is 2.6%; HfH2The granularity of the powder is 1-3 mu m, and the mass ratio of the powder after mixing is 1.6%; the mixed powder is filled into a rubber sheath for cold isostatic pressing forming, and the forming pressure is 200 MPa; and then removing the sheath to obtain a pressed green body. Thirdly, placing the blank body in a vacuum hot-pressing sintering furnace for sintering, firstly heating the blank body to 300 ℃ at a speed of 15 ℃/min, preserving heat for 20min, then heating to 700 ℃ at a speed of 1 ℃/min, preserving heat for 30min, then heating to 1350 ℃ at a speed of 10 ℃/min, preserving heat for 90min, applying axial pressure to 30MPa while preserving heat, and then cooling to room temperature at a cooling rate of 50 ℃/min to obtain a compact sintered blank body; fourthly, freely forging and deforming the sintered blank at the forging temperature of 1200 ℃ to obtain a disc-shaped blank with the required size; and fifthly, performing aging heat treatment on the formed blank piece, wherein the aging temperature is 750 ℃, keeping the temperature for 4 hours, cooling the blank piece along with a furnace, and performing machining treatment according to the surface requirement to finally obtain the disc-shaped finished part. Through performance tests, the prepared high-temperature alloy disc has the oxygen content of 43ppm, the endurance strength of 650 ℃ for 100 hours reaches 1170MPa, the endurance strength of 750 ℃ for 100 hours reaches 788MPa, and the low-cycle fatigue strength of 650 ℃ (frequency of 1Hz, cycle frequency of 2 multiplied by 10)4) Up to 1160MPa, and the comprehensive performance is higher than that of the prior nickel-based high-temperature alloy material.
Claims (3)
1. A preparation method of a low-oxide-inclusion high-performance powder metallurgy nickel-based high-temperature alloy is characterized by comprising the following specific preparation steps:
(1) firstly, preparing spherical pre-alloy powder by adopting a vacuum gas atomization powder preparation technology, wherein the mass ratio of the powder is as follows:
c: 0.16-0.19%, Cr: 9.8-12%, Co: 16.5-17.5%, W: 7.7-8.8%, Mo: 0.65-0.88%, Al: 5.75-6.30%, B: 0.025-0.033%, Zr: 0.055-0.087 percent and the balance of Ni, wherein the atomization atmosphere adopts high-purity argon, and the atomization temperature is 1650-1700 ℃;
(2) sieving the prealloying powder obtained by atomization, and taking the prealloying powder with the particle size range of 10-180 mu m and TiH2TaH and HfH2Mixing the three powders, wherein TiH2The granularity of the powder is 1-5 mu m, and the mass ratio of the powder after mixing is 4.1-4.6%; the particle size of the TaH powder is 1-3 μm, and the mass ratio of the TaH powder in the mixed powder is 2.6-2.85%; HfH2The granularity of the powder is 1-3 mu m, and the mass ratio of the powder after mixing is 1.6-1.85%; the mixed powder is filled into a rubber sheath for cold isostatic pressing forming, and the forming pressure is 200 MPa; then removing the sheath to obtain a pressed green body;
(3) placing the green body in a vacuum hot-pressing sintering furnace for sintering and heat preservation, and then cooling to room temperature at a certain rate to obtain a compact sintered green body; the sintering heat preservation parameters are as follows: firstly, heating the blank to 310 ℃ at a speed of 15 ℃/min, preserving heat for 19-21min, heating to 710 ℃ at a speed of 690 ℃ at a speed of 1 ℃/min, preserving heat for 29-31min, heating to 1360 ℃ at a speed of 10 ℃/min, preserving heat for 85-95min, and applying axial pressure to 30-50MPa while preserving heat; the cooling rate is 50-80 ℃/min;
(4) forging the sintered blank into a required shape by forging deformation, wherein free forging or die forging is adopted for forging; if the forging can not meet the forming requirement, rolling is required to be carried out continuously;
(5) and carrying out aging heat treatment on the formed part, cooling along with a furnace to obtain a high-temperature alloy material part blank with high endurance strength and fatigue strength, and then carrying out machining treatment according to the surface requirement to finally obtain a finished part.
2. The method for preparing the suboxide inclusion high-performance powder metallurgy nickel-based superalloy as claimed in claim 1, wherein the forging temperature in the step (4) is 1200-1250 ℃, and the rolling temperature is 1150-1200 ℃.
3. The method for preparing the suboxide inclusion high-performance powder metallurgy nickel-base superalloy as claimed in claim 1, wherein the aging temperature of the aging heat treatment in the step (5) is 750-.
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| CN1322157A (en) * | 1999-08-19 | 2001-11-14 | H·C·斯塔克公司 | Low oxygen refractory metal powder for powder metallurgy |
| CN108941588A (en) * | 2018-07-27 | 2018-12-07 | 中南大学 | A kind of preparation method of laser forming Ni-base Superalloy Powder |
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| CN1322157A (en) * | 1999-08-19 | 2001-11-14 | H·C·斯塔克公司 | Low oxygen refractory metal powder for powder metallurgy |
| CN108941588A (en) * | 2018-07-27 | 2018-12-07 | 中南大学 | A kind of preparation method of laser forming Ni-base Superalloy Powder |
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