CN115889756A - Composite high-performance activation auxiliary powder for repairing nickel-based superalloy and repairing method and application thereof - Google Patents
Composite high-performance activation auxiliary powder for repairing nickel-based superalloy and repairing method and application thereof Download PDFInfo
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- 239000000843 powder Substances 0.000 title claims abstract description 106
- 230000004913 activation Effects 0.000 title claims abstract description 84
- 239000002131 composite material Substances 0.000 title claims abstract description 54
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 229910000601 superalloy Inorganic materials 0.000 title claims abstract description 25
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims description 32
- 230000008439 repair process Effects 0.000 claims abstract description 70
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 43
- 239000000956 alloy Substances 0.000 claims abstract description 43
- 239000000654 additive Substances 0.000 claims abstract description 42
- 230000000996 additive effect Effects 0.000 claims abstract description 42
- 229910052796 boron Inorganic materials 0.000 claims abstract description 41
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000003381 stabilizer Substances 0.000 claims abstract description 28
- 230000007547 defect Effects 0.000 claims abstract description 20
- 238000002844 melting Methods 0.000 claims abstract description 16
- 239000012535 impurity Substances 0.000 claims abstract description 14
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 12
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- 239000004597 plastic additive Substances 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 10
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- 238000004321 preservation Methods 0.000 claims description 10
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- 239000003822 epoxy resin Substances 0.000 claims description 7
- 238000005498 polishing Methods 0.000 claims description 7
- 229920000647 polyepoxide Polymers 0.000 claims description 7
- 238000005219 brazing Methods 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000000280 densification Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
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- 239000003795 chemical substances by application Substances 0.000 claims 2
- 230000004048 modification Effects 0.000 claims 1
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- 239000013078 crystal Substances 0.000 description 8
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 description 8
- 229910052710 silicon Inorganic materials 0.000 description 8
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 6
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- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
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- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
A composite high-performance activation assistant powder for repairing Ni-base high-temp alloy is suitable for the additive repair of Ni-base cast high-temp part, and is composed of low-smelting-point boron-contained activation assistant and high-performance stabilizer. The low-melting point boron-containing activation auxiliary agent contains Cr, W, co, ta, re and B, the balance of Ni and impurity elements, and the high-performance stabilizer contains Mo, cr and W, and the balance of Co and impurity elements. The composite high-performance activation auxiliary powder solves the problem that the boron-containing repair material generates brittle phases such as massive boride and eutectic in an additive repair area, remarkably improves the plasticity of the additive repair area, can obtain a high-strength microstructure in an application area, is not influenced by the defect direction in the repair process, can repair various shape defects on a nickel-based cast superalloy component in an all-around and simultaneous manner, is short in repair time and low in energy consumption, and has wide important application value in the field of additive repair of nickel-based cast superalloy components.
Description
Technical Field
The invention belongs to the technical field of material engineering, relates to a composite multi-component alloy powder material and application thereof, and particularly relates to composite high-performance activation auxiliary powder for nickel-based superalloy repair, and a repair method and application thereof.
Background
The method has important significance for researching and developing a proper service damage defect repair technology for the nickel-based high-temperature alloy blade with high manufacturing cost, reducing the maintenance cost and improving the maintenance guarantee capability of the gas turbine. As a new nickel-based high-temperature alloy blade repairing technology, compared with conventional cladding welding and brazing, the powder metallurgy repairing remanufacturing technology has the advantages of being flexible in operation, capable of avoiding welding crack generation, remarkably improving performance of a repairing area and the like. The material used in the powder metallurgy repair remanufacturing technology is generally formed by mixing a low-melting-point activation auxiliary agent and high-melting-point plastic powder, adding a certain amount of adhesive to prepare additive paste, then coating the additive paste on a clean zone to be repaired, shaping, and finally placing a workpiece in a vacuum furnace for sintering. Throughout the process, the constituents of the activation aid powder are decisive for the healing effect.
Conventional commercial activation aid alloys are mostly a multi-component alloy, such as commercial designations AMS4775 (Ni-14 Cr-4.5Si-4.5 Fe-3B-0.7C), AMS4777 (Ni-7 Cr-4.5Si-3 Fe-3B), AMS4778 (Ni-3.1 Si-4.5B), NB171 (Ni-10 Cr-3.5Si-3.5 Fe-2.5B-12W), NB200 (Ni-7 Cr-6W-4.5Si-3.2 Fe-3.2B-0.06C), and the like. A large amount of B and Si are usually added into the activation auxiliary agent to be used as melting-reducing elements, and the purpose is to ensure that sufficient liquid phase is generated in the repairing process so as to reduce the generation of holes in a repairing area and improve the repairing quality. However, this also brings new problems, and a large amount of B and Si introduced by melting-down cannot be discharged after the repair is completed, and only brittle phases such as bulk borides, silicides, low-melting-point boron-rich and silicon-rich eutectic compounds exist in the repair area, which seriously affects the performance of the repair area. Some of the published patents on structural brazing alloys for superalloy components (CN 1056645A, CN1800425A, CN101306494A, CN101780610A, CN101780604A, CN101780612A, CN103894599B, CN109909641A, etc.) also add one or both of Si and B as melting-reducing elements in high proportions, which face the same problems during use as the commercial activation aid alloys described above. In addition, because the specific surface area of the powder material used for repair is large, the gas element O is more easily introduced and exists in the repair area in a free form in the repair process, and the performance of the repair area is adversely affected.
In order to enhance the performance of the repair area, in actual production, after the joint is repaired by using the activation assistant alloy using B and Si as melting-reducing elements, the high temperature of dozens of or even dozens of hours is often needed to be carried out for long-time aging to uniformly diffuse the B and Si, which undoubtedly greatly increases the repair cost, and has limited effect of improving the performance of the joint. In addition, because parts such as turbine blades, guide blades and the like adopt complicated internal cooling structures in design, when the powder metallurgy repair is carried out by using commercial activation assistant alloy, in order to prevent liquid phase overflow from blocking a cooling channel, the powder metallurgy repair method is only suitable for repairing non-penetrating defects in the gravity direction, and cannot repair elevation angles, vertical angles and penetrating defects, and the use environment has great limitation.
Disclosure of Invention
The invention provides composite high-performance activation auxiliary powder for repairing a nickel-based superalloy and a repairing method thereof, which are used for additive repair of a nickel-based cast superalloy, aim to overcome the related defects of the prior art, find a material and a method which are different from the traditional repairing process, can reduce the performance damage of a repairing area, do not limit the penetrability and other defects, can greatly save the repairing cost, can solve the problem that a boron-containing repairing material generates brittle phases such as bulk boride, eutectic and the like in the additive repairing area, and can improve the plasticity and other defects of the additive repairing area.
The technical scheme of the invention is as follows:
a composite high-performance activating assistant powder for repairing Ni-base high-temp alloy is composed of low-smelting-point boron-contained activating assistant and high-performance stabilizer.
Wherein the low melting point boron-containing activation adjuvant comprises, by weight, 3.00-6.00% of Cr, 1.00-4.00% of W, 4.50-8.50% of Co, 4.50-7.50% of Ta, 1.50-3.50% of Re, 2.80-3.60% of B and the balance of Ni and inevitable impurity elements, and is prepared by an ultrahigh rotating speed plasma rotary electrode method, the particle size is 10-53 μm, and the melting temperature range of the alloy powder is 1070-1120 ℃.
Wherein, the high-performance stabilizer comprises 25.00 to 30.00 weight percent of Mo, 15.00 to 20.00 weight percent of Cr,0.00 to 5.00 weight percent of W and the balance of Co and inevitable impurity elements, and is prepared by an atomization method, the granularity is 10 to 30 mu m, and the melting temperature range of the alloy is 1290 to 1330 ℃.
The repair method of the composite high-performance activation assistant powder for the nickel-based superalloy repair comprises the following steps:
1. preparation of the powder
(1) Preparing a low-melting-point boron-containing type activation auxiliary agent by adopting an ultrahigh rotating speed plasma rotating electrode method, and screening out powder with the particle size of 10-53 mu m;
(2) Preparing a high-performance stabilizer by an atomization method, and screening powder with the particle size of 10-30 microns;
(3) Uniformly mixing the screened low-melting-point boron-containing activation assistant and the high-performance stabilizer according to the weight ratio of 3-4.
2. The method for repairing the defect additive material by using the composite high-performance activation auxiliary powder for repairing the nickel-based superalloy comprises the following steps:
(1) Fully mixing the composite high-performance activation auxiliary powder, the aggregate powder and the adhesive to prepare plastic additive paste;
(2) Coating the plastic additive paste on a to-be-repaired area of a cleaned workpiece, and shaping the additive paste;
(3) After the shaping of the additive paste is finished, the workpiece is placed in a vacuum heat treatment furnace for additive connection treatment, the temperature rise speed is not higher than 16.8 ℃/min, the workpiece is heated to 1190-1230 ℃, the temperature is kept for 15-40 min, and the vacuum degree requirement is better than 7 multiplied by 10 - 3 And Pa, cooling to room temperature along with the furnace after the heat preservation is finished.
Wherein, the length and the width of the additive repair are 0-60 mm, and the height is 0-5 mm.
The components are 30-40 wt% of composite high-performance activation assistant powder, 55-65 wt% of aggregate powder and 3-7 wt% of adhesive.
The aggregate powder is prepared from high-melting-point alloy powder and trace LaB 6 Mechanically mixing the high-melting-point alloy powder and the component to be repaired, wherein the high-melting-point alloy powder and the component to be repaired have the same chemical component ratio and are prepared by an atomization method, and the particle size of the powder is less than 150 mu m; laB 6 With a particle size of less than 10 μm, laB 6 The weight percentage of the aggregate powder accounts for 0 to 0.01 percent of the total weight of the aggregate powder.
The adhesive is epoxy resin.
3. The method for repairing the microcracks of the high-temperature alloy components by using the composite high-performance activation assistant powder for repairing the nickel-based high-temperature alloy comprises the following steps of:
(1) Removing oil stains and oxides on the connecting surface or cracks;
(2) Preparing a plastic additive paste by mixing the composite high-performance activation auxiliary powder with an adhesive, and then coating the plastic additive paste on the surface to be connected or the position of a crack to be repaired;
(3) The instantaneous liquid phase connection is carried out in a vacuum furnace, and the requirement of vacuum degree is better than 7 multiplied by 10 -3 Pa, the heating rate is not more than 16.8 ℃/min, the temperature is preserved for 10min to 30min at the temperature of 1190 ℃ to 1230 ℃, the solidification of the connection gap or the crack gap is finished in the heat preservation process at high temperature after the liquid phase is filled, the complete densification is achieved, and furnace cooling is carried out after the heat preservation;
(4) And polishing and modifying the redundant metal.
Wherein the width of the gap for transient liquid phase connection between the components or the gap for repairing cracks is 0.01 mm-0.1 mm.
The components are 93-97 percent of composite high-performance activation auxiliary powder and 3-7 percent of adhesive according to weight percentage.
The adhesive is epoxy resin.
The composite high-performance activation assistant powder can also be used for conventional brazing or large gap brazing.
The technical scheme of the invention has the advantages that:
1. design advantages of powder components of composite high-performance activation assistant
1. In the repairing process, after the low-melting-point boron-containing activation auxiliary agent is liquefied, the B element in the liquid phase is absorbed by the stabilizing agent to generate fine granular borides which are uniformly distributed among crystal grains, so that the generation of brittle phases such as massive borides and low-melting-point boron-rich eutectic compounds is inhibited, and the strength of a repairing area is remarkably improved.
2. The compound high-performance activated auxiliary agent powder is matched with aggregate powder, and can be suitable for repairing various high-aluminum titanium-content nickel-based casting high-temperature alloys such as MarM247, CM247LC, IN738LC, IN939, MGA2400, GTD-111, GTD-222 and the like, and trace LaB IN the aggregate powder 6 Can effectively capture free O in the repair area and is filled with fine lanthanum oxide particlesThe free O is scattered in the repair area, so that the adverse effect of the free O on the performance of the repair area is eliminated.
2. Advantages of process characteristics
1. In the repairing process, after the low-melting-point boron-containing type activation auxiliary agent is liquefied, the B element in the liquid phase can be quickly absorbed by the stabilizing agent, the isothermal solidification of a repairing area is promoted, the repairing work can be completed in a short time, and the phenomenon of liquid phase overflow can not occur, so that the use of the boron-containing type activation auxiliary agent for the elevation angle, the vertical angle and the penetrability defects can not be limited.
2. The repaired tissue is uniform, brittle phases such as massive boride and low-melting-point boron-rich eutectic compounds are not generated in the repair area, and fine granular boride is uniformly distributed among crystal grains, so long-time high-temperature diffusion heat treatment is not required after repair is finished, and the repair cost is greatly saved.
3. The defect of complex three-dimensional structure with large size and high depth can be repaired freely, and a plurality of stations can be repaired simultaneously.
3. The advantages of the invention are combined with the comparative example
The activation assistant alloys described in comparative examples 1 to 3 each contain a relatively large amount of B and Si as melting point suppressing elements, but are essentially different from the present invention in that the formation of brittle phases such as bulk boron, silicide, and boron-rich and silicon-rich eutectic compounds cannot be avoided. See table 1 for comparative examples of the activation aid alloy and the chemical composition of the present invention.
TABLE 1
After the material is added and repaired, the microstructure of the repaired area is characterized by gamma phase, gamma 'phase, gamma + gamma' eutectic, carbide, granular boride and lanthanum oxide which are dispersedly distributed among and in crystal, and does not contain brittle phases such as massive boride and eutectic and the like.
After additive repairing, the room temperature tensile strength of a repairing area is not lower than 850MPa, the high temperature tensile strength at 900 ℃ is not lower than 530MPa, and the elongation after fracture is not lower than 2%.
The composite high-performance activation auxiliary powder solves the problem that the boron-containing repair material generates brittle phases such as massive boride and eutectic in an additive repair area, remarkably improves the plasticity of the additive repair area, does not generate a weakening phase in an application effect, can obtain a high-strength microstructure in the application area, is not influenced by a defect direction in a repair process, can repair various shape defects on a nickel-based casting superalloy component in an all-round and simultaneous manner, is short in repair time and low in energy consumption, and has wide important application value in the field of additive repair of nickel-based casting superalloy components.
The composite high-performance activation assistant powder is formed by mechanically mixing a low-melting-point boron-containing activation assistant and a high-performance stabilizer according to the weight ratio of (3). Wherein the low melting point boron-containing activation auxiliary component comprises Cr, W, co, ta, re and B, matrix element Ni and inevitable impurity elements, wherein the Cr, W, co, ta and Re are strengthening elements in the high-temperature alloy, the B element is a main melting-reducing element, and the melting point is suppressed to 1070-1120 ℃. The high-performance stabilizer component consists of Mo, cr and W, a matrix element Co and inevitable impurity elements, and mainly has the functions of absorbing redundant B elements in a liquid phase in the repair process and promoting the B elements in the repair process to generate granular boride with the original size of the stabilizer nearby the stabilizer. When the composite high-performance activation auxiliary powder is matched with the aggregate powder to perform additive repair on a defect area, the high-melting-point alloy powder in the aggregate powder and the composite high-performance activation auxiliary powder fully react and fuse to form a crystal grain structure. During this period, mo, cr and W elements in the high-performance stabilizer absorb excessive B in the liquid phase, and granular boride of the stabilizer with the original size is generated near the stabilizer; micro LaB in aggregate powder 6 Capturing free O in the repair area and generating lanthanum oxide. After the repair is finished, an ideal microstructure appearance is obtained, a high-volume-fraction gamma' strengthening phase is dispersed and precipitated in the crystal and in the crystal boundary, and fine granular boride and lanthanum oxide are uniformly distributed among crystal grains to form a crystal boundary strengthening structure.
Drawings
FIG. 1 shows the micro-morphology of the composite high-performance activation aid powder DFB-13 of the present invention
FIG. 2 shows the macro-texture morphology of IN-738LC alloy after additive repair
FIG. 3 shows the microstructure morphology of IN-738LC alloy after additive repair according to the present invention
FIG. 4 shows the mechanical properties of IN-738LC alloy after additive repair
FIG. 5 shows the micro-morphology of the composite high-performance activation aid powder DFB-16 of the present invention
FIG. 6 shows the macro-texture morphology of the MarM247 alloy after additive repair
FIG. 7 shows the microstructure morphology of the MarM247 alloy after additive repair
FIG. 8 shows the mechanical properties of the MarM247 alloy after additive repair
FIG. 9 is a microscopic morphology of the composite high performance activation aid powder DFB-11 of the present invention
FIG. 10 shows the structure morphology of the MarM247 alloy after transient liquid phase bonding
Detailed Description
The present invention will be further described with reference to the following specific examples, but the embodiments of the present invention are not limited thereto.
Example 1
Additive repair of IN-738LC superalloy component
Step one, powder preparation
The composite high-performance activation assistant powder is DFB-13 type.
The low-melting point boron-containing activation assistant is prepared by an ultrahigh rotating speed plasma rotating electrode method, the powder granularity is 10-53 mu m, and the low-melting point boron-containing activation assistant comprises the following components in percentage by weight: 5.5% Cr, 2.8% by weight, 8.0% Co, 6.6% by weight, ta, 1.5% Re, 3.3% B, the remainder being Ni and unavoidable impurity elements.
The high-performance stabilizer is prepared by an atomization method, the powder granularity is 10-30 μm, and the high-performance stabilizer comprises the following components in percentage by weight: 28.0% Mo, 15.0% Cr, 2.0% W, the remainder being Co and unavoidable impurity elements.
Uniformly mixing the screened low-melting-point boron-containing activation assistant and the high-performance stabilizer according to the weight ratio of 3.
FIG. 1 is a microstructure of a DFB-13 type composite high performance activation aid powder.
The aggregate powder is prepared from trace LaB 6 Mechanically mixing with IN-738LC alloy powder produced by commercial atomization method, calculated by weight percentage, laB 6 Accounting for 0.01 percent of the total weight of the aggregate powder; the powder granularity of the high-temperature alloy powder is less than 150 mu m, and the LaB 6 Has a particle size of less than 10 μm.
Step two, defect additive manufacturing
(1) Fully mixing the composite high-performance activation auxiliary powder, the aggregate powder and the epoxy resin according to the weight percentage of 35 percent, 60 percent and 5 percent to prepare the plastic additive paste.
(2) The plastic additive paste is coated on a to-be-repaired area of a workpiece, the size of the to-be-repaired area is that the length is multiplied by the width and multiplied by the depth =30mm multiplied by 15mm multiplied by 3mm, the to-be-repaired area is polished to be bright by a hard alloy cutter and is cleaned by acetone, and the plastic additive paste is shaped.
Step three, additive connection
After the additive paste is shaped, putting the workpiece into a vacuum heat treatment furnace for additive connection treatment, wherein the heating speed is 10 ℃/min, the treatment temperature is 1190 ℃, the temperature is kept for 30min, and the vacuum degree is superior to 7 multiplied by 10 -3 And Pa, cooling to room temperature along with the furnace after heat preservation is finished.
Step four, size recovery
And processing and polishing the redundant additive repair area of the workpiece to recover the size.
Step five, checking
And (4) grinding and polishing the sintering area, and carrying out PT or FPT inspection to display the defect-free display.
Fig. 2 and 3 are a macroscopic and a microscopic tissue topography, respectively, after additive repair.
FIG. 4 shows the mechanical properties of the IN-738LC alloy after the addition repair of the DFB-13 type composite high-performance activation aid powder.
Example 2
Additive repair of MarM247 superalloy components
Step one, powder preparation
The composite high-performance activation assistant powder is DFB-16 type.
The low-melting point boron-containing activation assistant is prepared by an ultrahigh rotating speed plasma rotating electrode method, the powder granularity is 10-53 mu m, and the low-melting point boron-containing activation assistant comprises the following components: 5.5% Cr, 2.0% by weight, 5.0% Co, 4.6% Ta, 3.4% Re, 3.5% B, the remainder Ni and unavoidable impurity elements.
The high-performance stabilizer is prepared by an atomization method, the powder granularity is 10-30 mu m, and the high-performance stabilizer comprises the following components: contains 25.0% of Mo, 18.0% of Cr, 4.0% of W and the balance of Co and inevitable impurity elements.
Uniformly mixing the screened low-melting-point boron-containing activation assistant and the high-performance stabilizer according to the weight ratio of 3.
Fig. 5 is a micro-topography of a composite high-performance activation aid powder.
The aggregate powder is prepared from trace LaB 6 Mechanically mixing with MarM247 alloy powder produced by commercial atomization method, and mixing with LaB 6 Accounting for 0.01 percent of the total weight of the aggregate powder; the powder particle size of the high-melting point alloy powder is less than 150 mu m, and LaB 6 Has a particle size of less than 10 μm.
Step two, defect additive manufacturing
(1) Fully mixing the composite high-performance activation auxiliary powder, the aggregate powder and the epoxy resin according to the weight percentage of 35 percent, 60 percent and 5 percent to prepare the plastic additive paste.
(2) And coating the plastic additive paste on a to-be-repaired area of the workpiece, wherein the size of the to-be-repaired area is length multiplied by width multiplied by depth =30mm multiplied by 15mm multiplied by 4mm, the to-be-repaired area is polished and brightened by a hard alloy cutter and is cleaned by acetone, and the additive paste is shaped.
Step three, additive connection
After the additive paste shaping is finished, putting the workpiece into a vacuum heat treatment furnace for additive connection treatmentThe temperature rising speed is 10 ℃/min, the treatment temperature is 1220 ℃, the temperature is kept for 40min, and the vacuum degree is superior to 7 multiplied by 10 -3 And Pa, cooling to room temperature along with the furnace after the heat preservation is finished.
Step four, size recovery
And processing and polishing the redundant additive repairing area of the workpiece to recover the size.
Step five, checking
And (4) grinding and polishing the sintering area, and performing PT or FPT inspection to display the defect-free state.
Fig. 6 and 7 are a macro and micro tissue topography, respectively, after additive repair.
FIG. 8 shows the mechanical properties of a MarM247 alloy after the addition and repair of a composite high-performance activation aid powder DFB-16.
Example 3
Transient liquid phase joining of MarM247 superalloy components
Step one, powder preparation
The composite high-performance activation assistant powder is DFB-11 type.
The low-melting point boron-containing activation assistant is prepared by an ultrahigh rotating speed plasma rotating electrode method, the powder granularity is 10-53 mu m, and the low-melting point boron-containing activation assistant comprises the following components in percentage by weight: 3.2% Cr, 1.1% by weight, 8.5% Co, 4.5% Ta, 2.0% Re, 3.0% B, the remainder being Ni and unavoidable impurity elements.
The high-performance stabilizer is prepared by an atomization method, the powder granularity is 10-30 μm, and the high-performance stabilizer comprises the following components in percentage by weight: 28.0% Mo, 19.0% Cr, 1.0% W, the remainder being Co and unavoidable impurity elements.
Uniformly mixing the screened low-melting-point boron-containing activation auxiliary agent and the high-performance stabilizer according to the weight ratio of 4.
FIG. 9 is a microstructure of the DFB-11 powder of composite high performance activation aid.
Step two, surface pretreatment to be connected
Two to-be-connected surfaces with the areas of 30mm multiplied by 30mm are polished to be bright and flat, the surface roughness is less than 0.6 mu m, and the two to-be-connected surfaces are cleaned by acetone.
Step three, coating
(1) The composite high-performance activation assistant powder and the epoxy resin are fully mixed according to the weight percentage of 95 percent and 5 percent to prepare the plastic connecting paste.
(2) Coating the plastic connecting paste on one of the two surfaces to be connected, then carefully butting the surface which is not coated with the plastic connecting paste, fixing the surface by using a clamp, controlling the gap between the surface and the surface to be connected to be less than 0.1mm, and removing the extruded redundant plastic connecting paste.
Step four, transient liquid phase connection
Placing the butted components into a vacuum heat treatment furnace for instantaneous liquid phase connection, wherein the heating rate is 10 ℃/min, the treatment temperature is 1195 ℃, the temperature is kept for 15min, and the vacuum degree is superior to 7 multiplied by 10 -3 And Pa, cooling to room temperature along with the furnace after the heat preservation is finished.
Step four, size recovery
And polishing and shaping the overflowing redundant metal.
Step five, checking
Sampling the instantaneous liquid phase connecting joint at multiple points, and carrying out metallographic examination to show that no unfused defect exists. FIG. 10 shows the structure morphology of the composite high-performance activation aid powder DFB-11 after instantaneous liquid phase connection of MarM247 alloy components.
Claims (10)
1. The composite high-performance activation auxiliary powder for repairing the nickel-based superalloy is characterized in that: the composite high-performance activation assistant powder comprises a low-melting-point boron-containing activation assistant and a high-performance stabilizer; the low-melting-point boron-containing activation auxiliary agent and the high-performance stabilizer are 3 to 4 by weight; the low-melting-point boron-containing activation auxiliary agent comprises, by weight, 3.00% -6.00% of Cr, 1.00% -4.00% of W, 4.50% -8.50% of Co, 4.50% -7.50% of Ta, 1.50% -3.50% of Re, 2.80% -3.60% of B, and the balance of Ni and impurity elements; the high-performance stabilizer comprises, by weight, 25.00-30.00% of Mo, 15.00-20.00% of Cr, 0.00-5.00% of W, and the balance of Co and impurity elements.
2. The composite high-performance activation assisting agent powder for nickel-base superalloy repair according to claim 1, comprising: the granularity of the low-melting-point boron-containing activation auxiliary agent is 10-53 mu m, and the melting temperature of the alloy is 1070-1120 ℃.
3. The composite high-performance activation assisting agent powder for nickel-base superalloy repair according to claim 1, comprising: the granularity of the high-performance stabilizer is 10-30 mu m, and the melting temperature of the alloy is 1290-1330 ℃.
4. A method for repairing the composite type high performance activation assistant powder for nickel base superalloy repair according to any of claims 1 to 3, comprising: the repairing method is defect additive repairing, wherein the composite high-performance activation auxiliary powder, the aggregate powder and the adhesive are fully mixed to prepare a plastic additive paste, the plastic additive paste is coated on the defect of a region to be repaired and molded, and then the defect is heated to 1190-1230 ℃ in a vacuum furnace at a heating speed of not more than 16.8 ℃/min, and the vacuum degree is 7 multiplied by 10 -3 Pa or above, the heat preservation time is 15 min-40 min, and the furnace is cooled to room temperature after the heat preservation is finished; the length and the width of the additive repair are 0-60 mm, and the height is 0-5 mm.
5. The method for repairing the composite high-performance activation aid powder for nickel-base superalloy repair according to claim 4, wherein the method comprises: the composite high-performance activation auxiliary powder, the aggregate powder and the adhesive are 30-40% of the composite high-performance activation auxiliary powder, 55-65% of the aggregate powder and 3-7% of the adhesive in percentage by weight.
6. The method for repairing a composite high-performance activation aid powder for nickel-base superalloy repair according to claim 4, wherein: the aggregate powder is composed of high-melting-point alloy powder and LaB 6 Composition is carried out; the high-melting-point alloy powder and the component to be repaired have the same chemical component ratio and are prepared by an atomization method, and the particle size of the powder is less than 150 mu m; the LaB 6 The particle size of (A) is 0-10 mu m, the LaB 6 Accounting for 0 percent to 0.01 percent of the total weight of the aggregate powder by weight percentage.
7. The method for repairing a composite high-performance activation aid powder for nickel-base superalloy repair according to claim 4, wherein: the adhesive is epoxy resin.
8. A method for repairing the composite type high performance activation assistant powder for nickel base superalloy repair according to any of claims 1 to 3, comprising: the repairing method comprises instantaneous liquid phase connection and microcrack repair, wherein oil stains and oxides on the connecting surface or cracks of a region to be repaired are removed, then the composite high-performance activation assistant powder mixed adhesive is prepared into a plastic additive paste to be coated on the surface to be connected or the positions of the cracks to be repaired, and then the instantaneous liquid phase connection is carried out in a vacuum furnace, wherein the vacuum degree is superior to 7 multiplied by 10 -3 Pa, the heating rate is lower than 16.8 ℃/min, the temperature is kept at 1190-1230 ℃ for 10-30 min, the solidification of the connection gap or crack gap is finished in the heat preservation process at high temperature after the liquid phase is filled, the complete densification is achieved, furnace cooling is carried out after the heat preservation, and the polishing and the shape modification are carried out on the redundant metal; the width of the gap for instantaneous liquid phase connection between the components or the gap for repairing cracks is 0.01 mm-0.1 mm.
9. The method for repairing a composite high-performance activation aid powder for nickel-base superalloy repair according to claim 8, wherein: the composite high-performance activation auxiliary powder and the adhesive are 93-97 percent by weight of composite high-performance activation auxiliary powder and 3-7 percent by weight of adhesive; the adhesive is epoxy resin.
10. The composite high-performance activation aid powder for nickel-base superalloy repair according to any of claims 1 to 3, wherein: the composite type high-performance activation assistant powder is also used for conventional brazing or large gap brazing.
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