CN104831230B - A kind of aluminising chromium method of K447A alloy components - Google Patents
A kind of aluminising chromium method of K447A alloy components Download PDFInfo
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- CN104831230B CN104831230B CN201510245557.6A CN201510245557A CN104831230B CN 104831230 B CN104831230 B CN 104831230B CN 201510245557 A CN201510245557 A CN 201510245557A CN 104831230 B CN104831230 B CN 104831230B
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- 239000000956 alloy Substances 0.000 title claims abstract description 69
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 30
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 229910052804 chromium Inorganic materials 0.000 title abstract description 10
- 239000011651 chromium Substances 0.000 title abstract description 10
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 50
- 229910052786 argon Inorganic materials 0.000 claims abstract description 25
- 239000007789 gas Substances 0.000 claims abstract description 12
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000001257 hydrogen Substances 0.000 claims abstract description 9
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000001764 infiltration Methods 0.000 claims description 39
- 230000008595 infiltration Effects 0.000 claims description 37
- 239000004576 sand Substances 0.000 claims description 34
- 238000007664 blowing Methods 0.000 claims description 21
- 239000003795 chemical substances by application Substances 0.000 claims description 17
- 229910052593 corundum Inorganic materials 0.000 claims description 12
- 239000010431 corundum Substances 0.000 claims description 12
- 238000003466 welding Methods 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 8
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 7
- 239000002390 adhesive tape Substances 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 238000005201 scrubbing Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 235000019270 ammonium chloride Nutrition 0.000 claims description 4
- 239000012459 cleaning agent Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 244000137852 Petrea volubilis Species 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 abstract 1
- 238000005269 aluminizing Methods 0.000 description 19
- 238000005254 chromizing Methods 0.000 description 16
- 230000008569 process Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 4
- QQHSIRTYSFLSRM-UHFFFAOYSA-N alumanylidynechromium Chemical compound [Al].[Cr] QQHSIRTYSFLSRM-UHFFFAOYSA-N 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000005495 investment casting Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel 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
- 238000002360 preparation method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 description 1
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- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention provides a kind of aluminising chromium method of K447A alloy components, it comprises the following steps：Parts surface is cleaned and dried；Blow emergy；Furnace temperature is risen to 1030 DEG C ± 10 DEG C, at least 1 hour is incubated, while argon gas is led to more than 1 hour to crucible, argon flow amount 1.5m3/ h, when oozing the temperature inside the box and rising to >=750 DEG C, uses 1m3The hydrogen of/h flows changes argon gas, makes to ooze 1020 DEG C ± 10 DEG C of case inside holding, is come out of the stove after 10h~12h, increases gas flow to 2m3/ h, it is air-cooled.When oozing the temperature inside the box and being down to 500 DEG C~600 DEG C, hydrogen is changed with argon gas again, when case temperature is cooled to≤50 DEG C, break argon gas；Part is taken out, rinses and is dried with air-heater in >=70 DEG C of hot water immediately；Blow emergy；Part is heated to 1020 DEG C ± 10 DEG C, 4h~4.5h is incubated, then cooled down in logical argon gas.A kind of aluminising chromium method of K447A alloy components provided by the present invention, it can carry out aluminising chromium processing to K447A alloy components, and provide a kind of method of local aluminising chromium for the K447A alloy components with the vestibule for not needing aluminising chromium.
Description
Technical Field
The invention relates to the technical field of metal heat treatment, in particular to an aluminizing and chromizing method for a K447A alloy component.
Background
The K447A alloy is equiaxed crystal cast nickel-based high-temperature alloy, which is equivalent to Mar-M247 in the United states, the alloy strengthening mechanism is second-phase precipitation strengthening, and the alloy is suitable for manufacturing parts such as a guider in the field of aeroengines. In order to improve the surface corrosion resistance of the parts, the surfaces of the parts need to be subjected to aluminum chromium infiltration, and at present, no literature records of an aluminum chromium co-infiltration process matched with the material performance exist in China.
Meanwhile, the existing aluminum-chromium co-infiltration method for parts is mainly an integral embedding infiltration agent method, for example, the "infiltration agent for K418B alloy aluminizing chromium and preparation method, aluminizing chromium method" proposed in chinese patent CN103911582, it can only impregnate aluminum and chromium for the whole parts, and for the parts needing partial aluminizing chromium, there is no effective protection method for the non-infiltration layer surface at present.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method for alumetizing a K447A alloy component to reduce or avoid the aforementioned problems.
In order to solve the technical problem, the invention provides an aluminizing and chromizing method for a K447A alloy component, which is used for aluminizing and chromizing the K447A alloy component and comprises the following steps:
step A, cleaning the surface of the K447A alloy part by using an organic cleaning agent and airing;
b, blowing corundum sand to the K447A alloy part, wherein the mesh number of the corundum sand is more than or equal to 200 meshes, the pressure is less than or equal to 0.25MPa, and cleaning residual sand grains on the surface of the K447A alloy part by using compressed air after sand blowing;
step C, raising the temperature of the bell jar furnace to 1030 +/-10 ℃, preserving the temperature for at least 1 hour, burying the K447A alloy component into a permeation box by using a permeation agent, moving the permeation box into a crucible of the bell jar furnace, introducing argon into the crucible for more than 1 hour, and introducing argon with the flow of 1.5m3H, moving the crucible into the heating zone of the bell jar furnace, and when the temperature in the infiltration box rises to be more than or equal to 750 ℃, using 1m3Changing argon gas with hydrogen gas at a flow rate/h to ensure that the heat preservation temperature in the infiltration box is 1020 +/-10 ℃, calculating time when the temperature in the infiltration box rises to 1000 ℃, discharging the crucible after 10-12 h, and increasing the gas flow rate to 2m3And/h, cooling the crucible by blowing with a fan. When the temperature in the infiltration box is reduced to 500-600 ℃, replacing hydrogen with argon again, cutting off the argon when the box is cooled to be less than or equal to 50 ℃, opening the crucible, and taking out the infiltration box;
d, taking out the K447A alloy part, immediately washing in hot water at the temperature of more than or equal to 70 ℃ and drying by using a hot air blower;
e, blowing corundum sand to the K447A alloy part, wherein the mesh number of the corundum sand is more than or equal to 200 meshes, the pressure is less than or equal to 0.25MPa, and cleaning residual sand grains on the surface of the K447A alloy part by using compressed air after sand blowing;
and F, putting the K447A alloy component into a vacuum furnace, heating to 1020 +/-10 ℃, preserving the temperature for 4-4.5 hours, and introducing 3bar argon to start a fan to cool to be less than or equal to 150 ℃.
Preferably, the K447A alloy member is a ring-shaped hollow member, the side wall of which is provided with a plurality of bores,
in the step A, firstly cutting a protection sheet according to the shape and size of the hole cavity, wherein the protection sheet is made of a T8A material with the thickness of 0.1mm, polishing the protection sheet by using sand paper, scrubbing the protection sheet and the hole cavity completely by using acetone and white silk cloth, scrubbing the end face of the hole cavity until the white silk cloth does not change color, and positioning the cut protection sheet on the end face of the hole cavity in a spot welding manner, wherein the distance between welding points is 3-5 mm;
in the step B and the step E, the cavity is protected by an adhesive tape before sand blowing, and the adhesive tape is removed after residual sand grains on the surface are cleaned by compressed air after sand blowing;
in step F, after the K447A alloy member is cooled, the protective sheet at each of the cavities is removed, and the excess in each cavity is cleaned with clean compressed air.
Preferably, ooze the case and constitute by box, apron and protection tube, the box is formed by inner ring, outer loop and bottom plate welding, apron detachable with the box is connected, be provided with on the apron and supply the protection tube inserts the hole of box.
The invention provides an aluminizing and chromizing method for a K447A alloy component, which can carry out aluminizing and chromizing treatment on a K447A alloy component, wherein the depth of a penetration layer is 30-60 mu m, and the method for locally aluminizing and chromizing the K447A alloy component with a hole cavity which does not need to be aluminized and chromized is provided.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein,
FIG. 1 shows a schematic structural view of a K447A alloy component according to an embodiment of the invention;
FIG. 2 is an exploded perspective view of a infiltration tank for the K447A alloy component shown in FIG. 1.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings. Wherein like parts are given like reference numerals.
Referring to the chinese patent CN103911582 mentioned in the background of the invention, when the alumetizing operation is performed, the alumetizing operation is performed on the test piece which is the same as the component material, so that the alumetizing effect of the component can be obtained by inspecting the metallographic structure, the depth of the infiltrated layer, the oxidation resistance and the like of the test piece after the operation is finished.
The invention provides an aluminizing and chromizing method of a K447A alloy component, which is used for aluminizing and chromizing the K447A alloy component and comprises the following steps:
step A, cleaning the surface of the K447A alloy part by using an organic cleaning agent and airing; the organic cleaning agent can be trichloroethylene, acetone (nail polish), Tiana water, boiled oil water, white gasoline and the like.
B, blowing corundum sand to the K447A alloy part, wherein the mesh number of the corundum sand is more than or equal to 200 meshes, the pressure is less than or equal to 0.25MPa, and cleaning residual sand grains on the surface of the K447A alloy part by using compressed air after sand blowing;
step C, raising the temperature of the bell jar furnace to 1030 +/-10 ℃, preserving the temperature for at least 1 hour, burying the K447A alloy component into a permeation box by using a permeation agent, moving the permeation box into a crucible of the bell jar furnace, introducing argon into the crucible for more than 1 hour, and introducing argon with the flow of 1.5m3And h, introducing argon to remove air in the crucible and prevent the infiltration agent from being oxidized due to the air entering the infiltration box, wherein the infiltration agent comprises the following components: 48 to 52 percent of alumina powder, 38 to 42 percent of chromium powder, 8 to 10 percent of aluminum powder and 0.38 to 0.42 percent of ammonium chloride powder. The ammonium chloride powder is used as an active agent, so that the aluminizing and chromizing reaction of the K447A alloy part can be facilitated, and the activity of aluminum powder and chromium powder in the aluminizing agent can be maintained. The bell jar furnace may be a commercially available product such as a bell jar furnace model RDQ-66-12 manufactured by skyhawk electric furnace ltd, the crucible is a component of the bell jar furnace, and generally includes a base plate movable between different working sections of the bell jar furnace and a hood body liftable on the base plate to form an enclosed space with the base plate.
Moving the crucible into the heating zone of the bell jar furnace, and when the temperature in the infiltration tank rises to more than or equal to 750 ℃, taking 1m3Changing argon gas with hydrogen gas at a flow rate/h to ensure that the heat preservation temperature in the infiltration box is 1020 +/-10 ℃, calculating time when the temperature in the infiltration box rises to 1000 ℃, discharging the crucible after 10-12 h, moving out of a heating zone of the bell jar furnace, and increasing the gas flow rate to 2m3And/h, cooling the crucible by blowing with a fan. The hydrogen can be introduced to reduce oxides and chlorides generated in the permeating agent, so that the components and the activity of the permeating agent are ensured, the oxygen remaining in the permeating box and the oxygen leaked into the crucible in the heat treatment process are consumed, and in addition, the hydrogen can react with chlorine or ammonia generated after the reaction of ammonium chloride powder in the permeating agent, so that the environment can be prevented from being polluted. In the process of introducing hydrogen, the exhaust pipe of the crucible is ignited, so that redundant hydrogen and generated chloride can be combusted, and potential explosion hazards are avoided.
When the temperature in the infiltration box is reduced to 500-600 ℃, replacing hydrogen with argon again, cutting off the argon when the box is cooled to be less than or equal to 50 ℃, opening the crucible, and taking out the infiltration box; and finishing the deposition process of the K447A alloy component.
D, taking out the K447A alloy part, immediately washing in hot water at the temperature of more than or equal to 70 ℃ and drying by using a hot air blower;
e, blowing corundum sand to the K447A alloy part, wherein the mesh number of the corundum sand is more than or equal to 200 meshes, the pressure is less than or equal to 0.25MPa, and cleaning residual sand grains on the surface of the K447A alloy part by using compressed air after sand blowing;
and F, placing the K447A alloy part into a vacuum furnace, heating to 1020 +/-10 ℃, preserving heat for 4-4.5 hours, introducing 3bar argon, starting a fan to cool to the temperature of less than or equal to 150 ℃, and then placing the K447A alloy part into air to cool. The step allows the K447A alloy component to have a quick cooling process, so that the hidden danger of mechanical property change on the component base structure caused by the K447A alloy component in the slow cooling process in the step C can be eliminated.
Fig. 1 shows a schematic structural view of a K447A alloy component according to an embodiment of the present invention, and fig. 2 is an exploded perspective view of a infiltration tank for the K447A alloy component shown in fig. 1. Referring to fig. 1, in a preferred embodiment, the K447A alloy member 1 is an annular hollow member having a plurality of cavities 2 formed in a side wall thereof, many of which are annular hollow members in an aircraft engine, for example, fig. 1 shows a schematic structural view of a guider for an aircraft engine, which is formed by precision casting of a K447A material and requires alumetized outer surface, and an outer annular wall thereof has a plurality of cavities 2, the cavities 2 have a complicated inner structure, and no infiltration layer is required in the cavities 2, so that the cavities 2 need to be protected when the guider is subjected to alumetized. In order to protect the bore 2 during the chromizing process,
in the step A, firstly cutting a protection sheet according to the shape and size of the hole cavity 2, wherein the protection sheet (not shown in the figure) is made of a T8A material with the thickness of 0.1mm, polishing the protection sheet by using sand paper, removing burrs on the periphery of the protection sheet, scrubbing the protection sheet and the hole cavity 2 by using acetone and white silk cloth, scrubbing the end face of the hole cavity 2 until the white silk cloth is not discolored, and positioning the cut protection sheet on the end face of the hole cavity 2 in a spot welding mode, wherein the distance between welding points is 3-5 mm; the protective sheet is made of a T8A material with the thickness of 0.1mm, and the welding spot spacing is guaranteed to be 3-5 mm during electric welding, so that the protective sheet can guarantee the sealing performance of the hole cavity 2 in the process of embedding the K447A alloy component 1 into the penetrating agent, the penetrating agent is prevented from leaking into the hole cavity 2, the protective sheet can be conveniently removed through a bench worker process after the process of aluminizing and chromizing is finished, and the end face of the hole cavity 2 cannot be damaged.
In the step B and the step E, the cavity 2 is protected by an adhesive tape before sand blowing, so that sand grains can be prevented from entering the cavity 2, and the adhesive tape is removed after residual sand grains on the surface are cleaned by compressed air after sand blowing.
In step F, after the K447A alloy member is cooled and qualified, the protection sheet at each of the cavities 2 is removed by a bench work process, and the excess in each cavity is cleaned by clean compressed air. The aluminizing and chromizing treatment of the K447A alloy component can be completed.
Referring to fig. 2, the infiltration tank comprises a tank body 3, a cover plate 4 and a protection pipe 5, wherein the tank body 3 is formed by welding an inner ring 31, an outer ring 32 and a bottom plate (not shown in the figure), the cover plate 4 is detachably connected with the tank body 3, and the cover plate 4 is provided with a hole for inserting the protection pipe 5 into the tank body 3. Since the K447A alloy member 1 is an annular hollow member, the case body of the infiltration case can be provided in an annular shape composed of the inner ring 31 and the outer ring 32, which can greatly reduce the amount of the infiltration agent. Since the temperature indicated by the bell jar furnace is different from the temperature in the infiltration tank, the accurate temperature in the infiltration tank can be detected by inserting the protective tube 5 into the infiltration agent in the tank 3 on the cover plate 4 after the K447A alloy member 1 is embedded in the tank 3 with the infiltration agent, and by providing a temperature sensor such as a thermocouple in the protective tube 5.
The invention provides an aluminizing and chromizing method for a K447A alloy component, which can carry out aluminizing and chromizing treatment on a K447A alloy component, wherein the depth of a penetration layer is 30-60 mu m, and the method for locally aluminizing and chromizing the K447A alloy component with a hole cavity which does not need to be aluminized and chromized is provided.
It should be appreciated by those of skill in the art that while the present invention has been described in terms of several embodiments, not every embodiment includes only a single embodiment. The description is given for clearness of understanding only, and it is to be understood that all matters in the embodiments are to be interpreted as including technical equivalents which are related to the embodiments and which are combined with each other to illustrate the scope of the present invention.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent alterations, modifications and combinations can be made by those skilled in the art without departing from the spirit and principles of the invention.
Claims (3)
1. A method of alumetizing a K447A alloy component for alumetizing a K447A alloy component, comprising the steps of:
step A, cleaning the surface of the K447A alloy part by using an organic cleaning agent and airing;
b, blowing corundum sand to the K447A alloy part, wherein the mesh number of the corundum sand is more than or equal to 200 meshes, the pressure is less than or equal to 0.25MPa, and cleaning residual sand grains on the surface of the K447A alloy part by using compressed air after sand blowing;
step C, raising the temperature of the bell jar furnace to 1030 +/-10 DEG CKeeping the temperature for at least 1 hour, simultaneously embedding the K447A alloy component into a infiltration box by using an infiltration agent, moving the infiltration box into a crucible of a bell jar furnace, introducing argon into the crucible for more than 1 hour, and introducing the argon into the crucible with the flow of 1.5m3H, moving the crucible into the heating zone of the bell jar furnace, and when the temperature in the infiltration box rises to be more than or equal to 750 ℃, using 1m3Changing argon gas with hydrogen gas at a flow rate/h to ensure that the heat preservation temperature in the infiltration box is 1020 +/-10 ℃, calculating time when the temperature in the infiltration box rises to 1000 ℃, discharging the crucible after 10-12 h, and increasing the gas flow rate to 2m3Cooling the crucible by blowing with a fan; when the temperature in the infiltration box is reduced to 500-600 ℃, hydrogen is exchanged by argon again, when the box is cooled to be less than or equal to 50 ℃, the argon is cut off, the crucible is opened, the infiltration box is taken out, and the infiltration agent comprises the following components: 48 to 52 percent of alumina powder, 38 to 42 percent of chromium powder, 8 to 10 percent of aluminum powder and 0.38 to 0.42 percent of ammonium chloride powder;
d, taking out the K447A alloy part, immediately washing in hot water at the temperature of more than or equal to 70 ℃ and drying by using a hot air blower;
e, blowing corundum sand to the K447A alloy part, wherein the mesh number of the corundum sand is more than or equal to 200 meshes, the pressure is less than or equal to 0.25MPa, and cleaning residual sand grains on the surface of the K447A alloy part by using compressed air after sand blowing;
and F, putting the K447A alloy component into a vacuum furnace, heating to 1020 +/-10 ℃, preserving the temperature for 4-4.5 hours, and introducing 3bar argon to start a fan to cool to be less than or equal to 150 ℃.
2. The method of alumetizing a K447A alloy member according to claim 1, wherein the K447A alloy member is an annular hollow member having a side wall provided with a plurality of bores,
in the step A, firstly cutting a protection sheet according to the shape and size of the hole cavity, wherein the protection sheet is made of a T8A material with the thickness of 0.1mm, polishing the protection sheet by using sand paper, scrubbing the protection sheet and the hole cavity completely by using acetone and white silk cloth, scrubbing the end face of the hole cavity until the white silk cloth does not change color, and positioning the cut protection sheet on the end face of the hole cavity in a spot welding manner, wherein the distance between welding points is 3-5 mm;
in the step B and the step E, the cavity is protected by an adhesive tape before sand blowing, and the adhesive tape is removed after residual sand grains on the surface are cleaned by compressed air after sand blowing;
in step F, after the K447A alloy member is cooled, the protective sheet at each of the cavities is removed, and the excess in each cavity is cleaned with clean compressed air.
3. The method of claim 2, wherein the infiltration tank is composed of a tank body, a cover plate and a protection pipe, the tank body is formed by welding an inner ring, an outer ring and a bottom plate, the cover plate is detachably connected with the tank body, and the cover plate is provided with a hole for inserting the protection pipe into the tank body.
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| CN201510245557.6A CN104831230B (en) | 2015-05-15 | 2015-05-15 | A kind of aluminising chromium method of K447A alloy components |
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| CN111575646A (en) * | 2020-06-11 | 2020-08-25 | 南京国重新金属材料研究院有限公司 | Chromizing and aluminizing process for aero-engine blade |
| CN112195437B (en) * | 2020-10-29 | 2022-10-18 | 中国航发南方工业有限公司 | Aluminum-chromium co-permeation agent and application thereof |
| CN112626449A (en) * | 2020-11-30 | 2021-04-09 | 中国航发动力股份有限公司 | Preparation method of chromium modified aluminide coating on turbine blade |
| CN112609153B (en) * | 2020-12-14 | 2021-11-02 | 中南大学 | 3D printing nickel-based superalloy aluminizing coating aluminizing agent and aluminizing method |
| CN112695271A (en) * | 2020-12-22 | 2021-04-23 | 中南大学 | Method for aluminizing chromium on surface of nickel-based superalloy for turbine blade or vane |
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| CN1166807C (en) * | 2002-01-10 | 2004-09-15 | 北京航空航天大学 | Method for preparing coat of aluminide with chrome modified for enhancing performance of high heat oxidation resistance of TiAL alloy |
| CN103484816A (en) * | 2012-06-13 | 2014-01-01 | 常州兰翔机械有限责任公司 | Calorizing impregnation agent for K4648 alloy and preparation method thereof, and calorizing method |
| CN103911582A (en) * | 2013-01-07 | 2014-07-09 | 常州兰翔机械有限责任公司 | Impregnation agent for aluminum and chromium impregnation of K418B alloy, preparation method thereof, and aluminum and chromium impregnation method |
| CN104087895B (en) * | 2014-07-08 | 2016-09-21 | 中国南方航空工业(集团)有限公司 | Penetration enhancer and method for blade gas phase aluminising |
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