CN118080861A - Repairing paste for cobalt-based superalloy, preparation method of repairing paste and repairing method - Google Patents
Repairing paste for cobalt-based superalloy, preparation method of repairing paste and repairing method Download PDFInfo
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- CN118080861A CN118080861A CN202410096133.7A CN202410096133A CN118080861A CN 118080861 A CN118080861 A CN 118080861A CN 202410096133 A CN202410096133 A CN 202410096133A CN 118080861 A CN118080861 A CN 118080861A
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- 239000010941 cobalt Substances 0.000 title claims abstract description 46
- 229910017052 cobalt Inorganic materials 0.000 title claims abstract description 46
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 229910000601 superalloy Inorganic materials 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 230000008439 repair process Effects 0.000 claims abstract description 59
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 36
- 239000003381 stabilizer Substances 0.000 claims abstract description 32
- 239000000853 adhesive Substances 0.000 claims abstract description 17
- 230000001070 adhesive effect Effects 0.000 claims abstract description 17
- 230000003213 activating effect Effects 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 238000007634 remodeling Methods 0.000 claims abstract description 5
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims abstract description 4
- 238000011084 recovery Methods 0.000 claims abstract description 4
- 239000012190 activator Substances 0.000 claims description 27
- 238000004321 preservation Methods 0.000 claims description 18
- 238000002844 melting Methods 0.000 claims description 14
- 230000008018 melting Effects 0.000 claims description 13
- 238000000498 ball milling Methods 0.000 claims description 12
- 238000000889 atomisation Methods 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 16
- 229910052796 boron Inorganic materials 0.000 abstract description 13
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 abstract description 9
- 229910052804 chromium Inorganic materials 0.000 abstract description 8
- 229910052721 tungsten Inorganic materials 0.000 abstract description 7
- 230000005496 eutectics Effects 0.000 abstract description 6
- 229910045601 alloy Inorganic materials 0.000 description 18
- 239000000956 alloy Substances 0.000 description 18
- 239000011651 chromium Substances 0.000 description 13
- 239000000843 powder Substances 0.000 description 12
- 239000012071 phase Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 239000007791 liquid phase Substances 0.000 description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 238000000227 grinding Methods 0.000 description 5
- 238000005498 polishing Methods 0.000 description 5
- 239000006104 solid solution Substances 0.000 description 5
- 238000005728 strengthening Methods 0.000 description 5
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 5
- 230000006378 damage Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 230000002401 inhibitory effect Effects 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 230000005764 inhibitory process Effects 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 230000008569 process Effects 0.000 description 3
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- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 3
- 239000010937 tungsten Substances 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 239000010955 niobium Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052702 rhenium Inorganic materials 0.000 description 2
- 238000005201 scrubbing Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910021332 silicide Inorganic materials 0.000 description 2
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 2
- 229910052715 tantalum Inorganic materials 0.000 description 2
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
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- 230000000996 additive effect Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 235000011837 pasties Nutrition 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
Abstract
The invention discloses a repair paste of cobalt-based superalloy, a preparation method and a repair method thereof, and relates to the field of cobalt-based superalloy repair, wherein the repair paste is formed by mechanically mixing 30-40% of activating agent, 5-10% of stabilizing agent, 50-60% of curing agent and 5-10% of adhesive according to mass percentage, wherein the components of the activating agent are Cr, N i and W, ta, re, B, Y, and the balance is Co and unavoidable impurity elements; the components of the stabilizer are Cr, W, N i, mo, and the balance of Co and unavoidable impurity elements; the repairing method comprises the steps of coating repairing paste, metallurgical heat treatment and performance recovery heat treatment and repairing. The method can be used for the shape remodeling of the cobalt-based superalloy thermal component, the obtained repair area does not generate brittle harmful phases such as massive boride and boron-rich eutectic, the joint has high-temperature strength, and the problem of material increase repair of the cobalt-based superalloy thermal component is effectively solved.
Description
Technical Field
The invention relates to the field of cobalt-based superalloy repair, in particular to a repair paste for cobalt-based superalloy and a repair method thereof.
Background
The cobalt-based superalloy is an alloy which takes cobalt as a main component and contains a considerable amount of nickel, chromium and tungsten and a small amount of molybdenum, niobium, tantalum, titanium, carbon and other elements, has more excellent hot corrosion resistance, high strength and excellent thermal fatigue performance than the nickel-based superalloy at high temperature, and is very suitable for manufacturing high-temperature parts such as turbine blades, burner nozzles and the like of aeroengines, industrial gas turbines and ship gas turbines. Because the high-temperature component is in service in an ultra-high temperature environment and under extremely complex stress working conditions for a long time, the high-temperature component is extremely easy to generate structural integrity damage in the forms of ablation, meat reduction, cracking and the like, and the service life of the component can be greatly prolonged by repairing the damaged part by a reasonable and effective method, so that the operation and maintenance cost of the unit is reduced.
For a cobalt-based superalloy thermal component with a complex shape and a multi-thin-wall structure (such as a turbine blade), the effective repair of damage defects can be realized by adopting a powder metallurgy repair technology with flexible operation; the conventional repair material is formed by mixing a low-melting-point alloy powder and a high-melting-point alloy powder. At high temperature, the low melting point alloy powder melts to form a liquid phase, wets and fills the gap between the substrate and the high melting point alloy powder and undergoes isothermal solidification to form a metallurgical bond joint.
The alloy powder with low melting point usually contains high concentration of active elements Si and B, such as commercial grade AMDRY788 (Co-21 Ni-22Cr-14W-2 Si-2B), AMS4783 (Co-17 Ni-19Cr-4W-8 Si-0.8B) and the like, to achieve the inhibitory effect on the composition Jin Rongdian; however, due to the introduction of high-concentration Si and B, the repaired joint contains a large amount of massive boride, silicide, low-melting-point B-rich eutectic compound and other brittle phases, so that the joint has poor high-temperature mechanical properties and limited use prospects.
Disclosure of Invention
The invention aims at: aiming at the problems, the repair paste and the repair method of the cobalt-based superalloy can be used for shape remodeling of the cobalt-based superalloy thermal component, the obtained repair area has no generation of brittle harmful phases such as massive boride and boron-rich eutectic, and the joint has high-temperature strength, so that the problem of additive repair of the cobalt-based superalloy thermal component is effectively solved.
The technical scheme adopted by the invention is as follows: the repair paste for the cobalt-based superalloy is prepared by mixing, by mass, 30-40% of an activating agent (30-40%), 5-10% of a stabilizing agent (5-10%), 50-60% of a curing agent and 5-10% of an adhesive; wherein:
The activator comprises, by weight, cr (7.3-11.8%), N i (9.1-14.7%), W (0.7-3.9%), ta (0.7-5.9%), re (0-3.9%), B (1.8-3.60%), Y (0.01-0.05%), and the balance Co and unavoidable impurity elements;
The stabilizer comprises, by weight, cr (19.3% -25.8%), W (21.1% -28.7%), N i (7.1% -12.9%), mo (0.7% -3.9%), and the balance Co and unavoidable impurity elements.
Specifically, the activator melts in the metallurgical heat preservation stage, the generated liquid phase fills the gaps among the stabilizer, the curing agent and the base material through capillary action, and isothermal solidification occurs along with the concentration reduction of the melting point inhibition element B in the liquid phase; the effect of the elements used is shown below.
Cr (7.3 to 11.8 weight percent) is an indispensable alloying element in the cobalt-based superalloy, most of the Cr can be dissolved in gamma phase, a small amount of Cr forms carbide, and the solid solution strengthening effect is small; but 7.3 to 11.8 weight percent of Cr can obviously improve the high-temperature oxidation resistance and the hot corrosion resistance of the shapeable remolded area.
N i (9.1 to 14.7 wt%) and 9.1 to 14.7wt% of N i can improve the stability of face-centered cubic cobalt-based austenite under high temperature conditions by inhibiting the transition of the face-centered cubic cobalt-based austenite to a close-packed hexagonal crystal structure at a lower temperature; on the other hand, the durability of the repair area (the area after the repair of the damaged area) can be maintained, and the reduction of the durability caused by excessive addition is avoided.
W (0.7wt% -3.9wt%) is an important solid solution strengthening element in cobalt-based superalloy, has large atomic size, can obviously cause lattice expansion, forms a large long-range stress field, blocks dislocation movement, obviously improves the tensile property and durability of the alloy, and the content of W in the cobalt-based superalloy is generally more than 10wt%; however, W is boride forming element, and 0.7-3.9 wt% of W can prevent large-size boride from being formed after the activator is melted.
Ta (0.7 to 5.9 weight percent) and Re (0 to 3.9 weight percent), have large atomic sizes, are similar to W, and can obviously cause lattice expansion after being dissolved in a matrix, thereby playing an obvious solid solution strengthening role; ta is not easy to combine with boron, can be effectively reserved in a matrix phase, and Re can effectively promote the wettability of a liquid phase generated after an activator is melted, but both elements belong to rare elements and are high in price; ta of 0.7 to 5.9wt% and Re of 0 to 3.9wt% can maintain the effect of the self-body and can achieve the aim of reducing the cost as much as possible.
B (1.8 wt% -3.6 wt%) as melting point inhibitor.
Y (0.01-0.05 wt%) is rare earth element, and trace addition can be used for purifying grain boundary.
The stabilizer is used for absorbing B element in liquid phase and promoting isothermal solidification of the liquid phase, and the effect of the used elements is shown as follows.
Cr (19.3 wt% to 25.8 wt%) to form Cr-rich boride of the type CrB 2、CrB、Cr5B3 or the like.
W (21.1 wt% to 28.7 wt%) to form W 2 B or the like type W-rich boride.
N i (7.1 wt% to 12.9 wt%) for stabilizing face-centered cubic matrix.
Mo (0.7-3.9 wt%) to form MoB 2 and other Mo-rich boride, and can avoid precipitation of mu phase caused by excessive addition.
Further, the melting temperature range of the activator is controlled between 1090 ℃ and 1160 ℃ so as to ensure that the activator can be completely melted in the metallurgical heat preservation process when the repair paste repairs the damaged area.
Further, the curing agent is commercial brand alloy powder such as FSX414, K640, G-65, mar-M509, HS-25 and the like, preferably commercial brand alloy powder which is the same material as the repaired part, is used for filling a large-size gap of a damaged area, and has the granularity of 78-150 mu M.
Further, the adhesive is a commercial NICROBRAZ S-BINDR adhesive, which is used for preparing an activator, a stabilizer and a curing agent into paste.
Further, the adhesive can be completely volatilized below 100 ℃ to avoid the adhesive from remaining in the material of the repair area.
Further, the repairing paste is pasty, so that the fluidity is reduced, the repairing agent is stable when being smeared and filled at the remodelling position, and the repairing agent is prevented from being separated from the remodelling position before being heated and melted; the viscous repairing agent is more convenient to fill the remodelling area, and is particularly characterized in that the viscous repairing agent has certain fluidity, when the repairing agent fills the remodelling position, the shape of the repairing agent can be automatically changed according to the size of the filling position due to the fluidity of the repairing agent, the filling of the irregular remodelling area is met, the repairing agent can be completely filled under the action of the fluidity of the repairing agent, and the defect gaps in the remodelling area are reduced.
Further, the repair paste may be used, but is not limited to, repairing cobalt-based superalloy thermal components of substrates such as FSX414, K640, G-65, mar-M509, HS-25, and the like.
The preparation method for preparing the repair paste of the cobalt-based superalloy comprises the following steps:
a1: preparing an activating agent and a stabilizing agent;
A2: and (3) fully mixing the activating agent, the stabilizing agent, the curing agent and the adhesive according to the corresponding mass percentages through ball milling to finish the preparation of the repairing paste of the cobalt-based superalloy.
Further, in the step A2, a planetary ball mill is adopted for ball milling, a tank body and a grinding ball used for ball milling are made of tungsten carbide, the ball-to-material ratio is (6-8): 1, the ball milling time is 15-60 min, and the rotating speed is 300-500 r/min, so that the full mixing of the materials is ensured.
During ball milling, high-purity argon is introduced into the tank body, so that the activator, the stabilizer, the curing agent and the adhesive are mixed in the argon atmosphere, the protection effect is achieved, and oxidation is avoided.
Further, the activator is prepared by adopting an ultrahigh-speed plasma rotating electrode method, the granularity of the prepared activator is 30-53 mu m, the activator can be fully melted during metallurgical heat preservation in repairing damaged areas, and the effect of melting is prevented from being influenced by overlarge granularity of the activator.
Further, the stabilizer is prepared by other atomization methods, and the granularity of the prepared stabilizer is 0-20 mu m.
A repairing method of cobalt-based superalloy, which uses the repairing paste of cobalt-based superalloy, comprises the following steps:
s1: coating the repair paste on the damaged area of the cobalt-based superalloy component;
S2: placing the cobalt-based superalloy component coated with the repair paste in a vacuum environment for metallurgical heat preservation, and cooling along with a furnace after heat preservation;
s3: and performing performance recovery heat treatment on the cobalt-based superalloy component, and finishing the shape remodeling of the damaged area after the repair.
Further, before step S1, polishing and cleaning the damaged area are required; wherein mechanical polishing is adopted for polishing, and a surface oxide layer is removed; the cleaning adopts high-purity alcohol or high-purity acetone for scrubbing, and oil stains and metal scraps on the surface are removed.
Further, in the step S2, the metallurgical heat preservation temperature is controlled to 1170-1200 ℃, and the heat preservation time is controlled to 20-40 min.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. According to the activator disclosed by the invention, by introducing elements of nickel, chromium, tungsten, tantalum and rhenium as solid solution strengthening elements and introducing element of boron as a melting point inhibiting element; the stabilizer disclosed can induce boron to generate tiny boride which has little harm to the performance of the repaired joint in metallurgical heat preservation, thereby obviously improving the mechanical performance of the repaired joint;
2. According to the invention, the stabilizer is introduced, so that the melting point inhibition element boron in the liquid phase in the metallurgical heat preservation stage can be quickly absorbed by the stabilizer with small size, so that granular boride with small size is formed and is dispersed and distributed in the repair area, the generation of brittle phases such as massive boride and low-melting point boron-rich eutectic is effectively inhibited, the diffusion of boron to the substrate is effectively inhibited to damage the substrate, the mass loss of solid solution strengthening elements chromium, tungsten and molybdenum in the curing agent is effectively inhibited, and the high-temperature mechanical property of the repair joint is remarkably improved.
Drawings
The invention will now be described by way of example and with reference to the accompanying drawings in which:
FIG. 1 is a microscopic morphology of an activator of the present invention;
FIG. 2 is a microscopic morphology of the curing agent of the present invention;
FIG. 3 is a structural morphology of the FSX414 alloy blade after repair according to the present invention;
FIG. 4 is a flow chart of a method for repairing a cobalt-based superalloy of the present disclosure.
Detailed Description
All of the features disclosed in this specification, or all of the steps in a method or process disclosed, may be combined in any combination, except for mutually exclusive features and/or steps.
Any feature disclosed in this specification may be replaced by alternative features serving the same or equivalent purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
Example 1
The repair paste for the cobalt-based superalloy is prepared by mixing, by mass, 30-40% of an activating agent (30-40%), 5-10% of a stabilizing agent (5-10%), 50-60% of a curing agent and 5-10% of an adhesive; wherein:
The activator comprises, by weight, cr (7.3% -11.8%), ni (9.1% -14.7%), W (0.7% -3.9%), ta (0.7% -5.9%), re (0% -3.9%), B (1.8% -3.60%), Y (0.01% -0.05%), and the balance Co and unavoidable impurity elements;
The stabilizer comprises, by weight, cr (19.3% -25.8%), W (21.1% -28.7%), ni (7.1% -12.9%), mo (0.7% -3.9%), and the balance Co and unavoidable impurity elements.
In order to further clearly illustrate and describe the technical solutions of the present invention, the following non-limiting embodiments are provided, and table 1 shows the embodiments of the activators and stabilizers of this example.
Table 1: embodiment of the activator and stabilizer of the present example
The curing agent is commercial brand alloy powder such as FSX414, K640, G-65, mar-M509, HS-25 and the like, and the granularity is 78-150 mu M; the adhesive is NICROBRAZ S-BINDR type commercial adhesive.
To further illustrate the effect of the present invention, in this example, three repair materials for repairing a damaged region of cobalt-based superalloy are listed, which are respectively comparative example 1, comparative example 2 and comparative example 3, and the chemical compositions thereof are shown in detail in table 2.
Table 2: comparative examples 1 to 3 chemical composition of repair material
| Element(s) | Example 1 | Example 2 | Example 3 |
| Co | Bal. | Bal. | Bal. |
| Cr | 22.0 | 19.0 | 16.0 |
| Ni | 21.0 | 17.0 | 21.0 |
| Al | / | / | 2.0 |
| W | 14.0 | 4.0 | 12.0 |
| Ti | / | / | 0.5 |
| Mo | / | / | 0.5 |
| Nb | / | / | 0.5 |
| La | 0.03 | / | / |
| Si | 2.0 | 8.0 | 1.2 |
| B | 2.0 | 0.8 | 2.0 |
| Melting point | 1166℃ | 1121℃ | / |
Comparative examples 1 to 3 achieve the melting point inhibition effect by introducing high concentration of Si or/and B, but the difference from the present invention is that the repair material provided in comparative examples 1 to 3 contains high concentration of boride, silicide-forming elements Cr and W, which results in a metallurgical heat preservation stage, in-situ precipitation of brittle phases such as large-sized boride, silicide and the like in the liquid phase, and the residual B also continues to form a brittle B-rich eutectic phase with a low melting point, resulting in serious degradation of mechanical properties of the repair region.
In combination with the comparative example, the technical advantages of the invention are as follows: the activator does not contain Si, so that the generation of Si-rich phase in a repair area is avoided; contains low concentrations of boride-forming elements Cr and W, thus inhibiting precipitation of massive boride; by introducing a proper amount of stabilizer with small size, B is induced to be precipitated in the form of boride with small size, and is dispersed and distributed in a shape remolding area, so that the precipitation of low-melting-point boron-containing eutectic phase is inhibited, and the high-temperature mechanical property of the repaired joint is remarkably improved.
Example 2
The preparation method for preparing the repair paste of the cobalt-based superalloy with the brand of DFG-FSX414 comprises the following steps:
A1: preparing an activating agent and a stabilizing agent; wherein: preparing the DFB-C1 activator disclosed in example 1 by adopting an ultra-high-speed plasma rotary electrode method, wherein FIG. 1 is the morphology of the prepared activator; other atomization methods were used to prepare the DFB-W1 stabilizer disclosed in example 1; the curing agent is FSX414 alloy powder, and the microscopic morphology of the curing agent is shown in figure 2; the adhesive is NICROBRAZ S-BINDR type commercial adhesive.
A2: the DFB-C1 activator, the DFB-W1 stabilizer, the FSX414 alloy powder and the adhesive are mixed according to the mass percentage of 30:10:55:5, burdening, namely placing the mixture in a ball milling tank made of tungsten carbide after burdening is finished, adding grinding balls made of tungsten carbide, wherein the ball-to-material ratio is 6:1, introducing high-purity argon into the tank body, sealing, and mechanically ball-milling the mixture on a planetary ball mill for 15min at a rotating speed of 300r/min; and after ball milling, separating the grinding balls by using a screen mesh to obtain the DFG-FSX414 repair paste.
Example 3
The preparation method for preparing the repair paste of the cobalt-based superalloy with the brand of DFG-K640 comprises the following steps:
a1: preparing an activating agent and a stabilizing agent; wherein: preparing the DFB-C2 activator disclosed in the example 1 by adopting an ultra-high rotating speed plasma rotary electrode method; other atomization methods were used to prepare the DFB-W2 stabilizer disclosed in example 1; the solidifying agent is K640 alloy powder, and the binder is NICROBRAZ S-BINDR type commercial binder.
A2: the DFB-C2 activator, the DFB-W2 stabilizer, the K640 alloy powder and the adhesive are mixed according to the mass percentage of 30:8:54:8, mixing materials, placing the materials in a ball milling tank made of tungsten carbide after mixing, adding grinding balls made of tungsten carbide, wherein the ball-material ratio is 7:1, introducing high-purity argon into the tank body, sealing, and mechanically ball-milling for 15min on a planetary ball mill at a rotating speed of 500r/min; and after ball milling, separating the grinding balls by using a screen mesh to obtain the DFG-K640 repair paste.
Example 4
A repair method of cobalt-based superalloy, which uses DFG-FSX414 prepared in example 2 to repair paste to repair cobalt-based superalloy blade made of FSX414 alloy with impaired shape, wherein the nominal chemical composition Co-29wt% Cr-10wt% Ni-7.5 wt% W-1wt% Fe-0.25wt% C-0.01wt% B of FSX414 alloy comprises the following steps:
S1: and (3) coating the DFG-FSX414 repair paste on the damaged area of the cobalt-based superalloy blade, which is polished and cleaned, and shaping.
S2: placing the cobalt-based superalloy blade coated with the repair paste in a vacuum environment with the vacuum degree being better than 1 multiplied by 10 < -3 > Pa for metallurgical heat preservation, wherein the heat preservation temperature is 1180 ℃, the heat preservation time is 20min, and cooling along with a furnace after heat preservation; the vacuum environment is provided by a vacuum oven.
S3: and performing performance recovery heat treatment on the cobalt-based superalloy blade according to the heat treatment standard of the blade, and finishing the shape remodeling of the damaged area after repairing.
Before step S1, mechanically polishing and removing an oxide layer on the defect surface of the FSX414 alloy blade by using a hard alloy steel drill bit, wherein the defect sizes are smaller than 20mm multiplied by 3mm, and scrubbing the polished surface by using high-purity alcohol after polishing.
As shown in fig. 3, the repair area was dense, the interface connection was good, and no heterogeneous weakened phase was found.
In this example, a tensile test piece was made of the repair joint (including the repair region), and the room temperature yield strength of 476MPa, the room temperature tensile strength of 584MPa, and the room temperature tensile strength of 78.6% of the base material were measured; the high-temperature yield strength 275MPa at 650 ℃, the high-temperature tensile strength 389MPa at 650 ℃ and the high-temperature tensile strength at 650 ℃ reach 63.4% of the base material.
The invention is not limited to the specific embodiments described above. The invention extends to any novel one, or any novel combination, of the features disclosed in this specification, as well as to any novel one, or any novel combination, of the steps of the method or process disclosed.
Claims (10)
1. A repair paste for cobalt-based superalloy is characterized in that: according to the mass percentage, the repairing paste is formed by mixing an activating agent (30-40%), a stabilizing agent (5-10%), a curing agent (50-60%) and an adhesive (5-10%). Wherein:
The activator comprises, by weight, cr (7.3% -11.8%), ni (9.1% -14.7%), W (0.7% -3.9%), ta (0.7% -5.9%), re (0% -3.9%), B (1.8% -3.60%), Y (0.01% -0.05%), and the balance Co and unavoidable impurity elements;
The stabilizer comprises, by weight, cr (19.3% -25.8%), W (21.1% -28.7%), ni (7.1% -12.9%), mo (0.7% -3.9%), and the balance Co and unavoidable impurity elements.
2. A repair paste according to claim 1, wherein: the melting temperature of the activator is controlled between 1090 ℃ and 1160 ℃.
3. A repair paste according to claim 1, wherein: the binder is capable of fully volatilizing below 100 ℃.
4. A repair paste according to any one of claims 1-3, wherein: the repairing paste is in the form of paste.
5. A method for preparing the repair paste of the cobalt-based superalloy according to any of claims 1 to 4, which is characterized in that: the method comprises the following steps:
a1: preparing an activating agent and a stabilizing agent;
A2: and (3) fully mixing the activating agent, the stabilizing agent, the curing agent and the adhesive according to the corresponding mass percentages through ball milling to finish the preparation of the repairing paste of the cobalt-based superalloy.
6. The method of manufacturing according to claim 5, wherein: the activator is prepared by adopting an ultrahigh-speed plasma rotating electrode method, and the granularity of the prepared activator is 30-53 mu m.
7. The method of manufacturing according to claim 5, wherein: the stabilizer is prepared by other atomization methods, and the granularity of the prepared stabilizer is 0-20 mu m.
8. A method for repairing a cobalt-based superalloy, using the repair paste of the cobalt-based superalloy as defined in any one of claims 1 to 4, characterized in that: the method comprises the following steps:
s1: coating the repair paste on the damaged area of the cobalt-based superalloy component;
S2: placing the cobalt-based superalloy component coated with the repair paste in a vacuum environment for metallurgical heat preservation, and cooling along with a furnace after heat preservation;
s3: and performing performance recovery heat treatment on the cobalt-based superalloy component, and finishing the shape remodeling of the damaged area after the repair.
9. The repair method according to claim 8, wherein: before step S1, the damaged area needs to be polished and cleaned.
10. The repair method according to claim 8, wherein: in the step S2, the metallurgical heat preservation temperature is controlled to 1170-1200 ℃, and the heat preservation time is controlled to 20-40 min.
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