CN117363913B - Low-carbon high-aluminum niobium-containing cobalt-based superalloy and preparation method thereof - Google Patents
Low-carbon high-aluminum niobium-containing cobalt-based superalloy and preparation method thereof Download PDFInfo
- Publication number
- CN117363913B CN117363913B CN202311677681.0A CN202311677681A CN117363913B CN 117363913 B CN117363913 B CN 117363913B CN 202311677681 A CN202311677681 A CN 202311677681A CN 117363913 B CN117363913 B CN 117363913B
- Authority
- CN
- China
- Prior art keywords
- less
- equal
- metal
- low
- raw materials
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 73
- 229910017052 cobalt Inorganic materials 0.000 title claims abstract description 36
- 239000010941 cobalt Substances 0.000 title claims abstract description 36
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 229910000601 superalloy Inorganic materials 0.000 title claims description 32
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 89
- 239000000956 alloy Substances 0.000 claims abstract description 89
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 74
- 238000007670 refining Methods 0.000 claims abstract description 68
- 229910052751 metal Inorganic materials 0.000 claims abstract description 65
- 239000002184 metal Substances 0.000 claims abstract description 65
- 238000000034 method Methods 0.000 claims abstract description 54
- 239000002994 raw material Substances 0.000 claims abstract description 53
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 50
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 42
- 239000001301 oxygen Substances 0.000 claims abstract description 42
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 37
- 238000007600 charging Methods 0.000 claims abstract description 36
- 239000010955 niobium Substances 0.000 claims abstract description 36
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 33
- 230000008569 process Effects 0.000 claims abstract description 31
- 238000005275 alloying Methods 0.000 claims abstract description 27
- 239000007789 gas Substances 0.000 claims abstract description 26
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 26
- 239000010439 graphite Substances 0.000 claims abstract description 26
- 238000005266 casting Methods 0.000 claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- 229910052742 iron Inorganic materials 0.000 claims abstract description 10
- -1 ferroboron Substances 0.000 claims abstract description 9
- 238000010309 melting process Methods 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 33
- 238000002844 melting Methods 0.000 claims description 26
- 230000008018 melting Effects 0.000 claims description 26
- 239000007788 liquid Substances 0.000 claims description 25
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 20
- 230000005611 electricity Effects 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- 229910052786 argon Inorganic materials 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 229910052698 phosphorus Inorganic materials 0.000 claims description 9
- 229910052717 sulfur Inorganic materials 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 8
- 238000010079 rubber tapping Methods 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 8
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 238000011049 filling Methods 0.000 claims description 7
- 229910052748 manganese Inorganic materials 0.000 claims description 7
- 238000007711 solidification Methods 0.000 claims description 7
- 230000008023 solidification Effects 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 2
- BDMHSCBWXVUPAH-UHFFFAOYSA-N cobalt niobium Chemical compound [Co].[Nb] BDMHSCBWXVUPAH-UHFFFAOYSA-N 0.000 claims 2
- 238000002156 mixing Methods 0.000 claims 1
- 230000006698 induction Effects 0.000 abstract description 32
- 238000003723 Smelting Methods 0.000 abstract description 19
- 229910052758 niobium Inorganic materials 0.000 abstract description 16
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 abstract description 12
- 239000000126 substance Substances 0.000 abstract description 12
- 239000010936 titanium Substances 0.000 description 32
- 230000005540 biological transmission Effects 0.000 description 30
- 239000011651 chromium Substances 0.000 description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 19
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 12
- 229910052719 titanium Inorganic materials 0.000 description 8
- 238000004321 preservation Methods 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 5
- 238000007872 degassing Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 238000004381 surface treatment Methods 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 241001062472 Stokellia anisodon Species 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000943 NiAl Inorganic materials 0.000 description 1
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/07—Alloys based on nickel or cobalt based on cobalt
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to the field of vacuum smelting of high-temperature alloy, in particular to a low-carbon high-aluminum niobium-containing cobalt-based high-temperature alloy and a preparation method thereof, wherein the preparation method comprises the following steps: and (3) a batching procedure: selecting graphite, ferroboron, metal Cr, metal Nb, sponge Ti, metal Al, ni plate, pure Fe and Co plate, proportioning according to the mass percentage of preset chemical components, controlling the total oxygen content brought in raw materials to be lower than a first preset value, and controlling the nitrogen content to be lower than a second preset value, wherein the raw materials comprise a charging process, a melting process, a refining process, a deoxidizing alloying process and a casting process. According to the technical scheme, the problem of purity control of oxygen, nitrogen, nonmetallic inclusion and the like of a high-temperature alloy induction ingot containing niobium and cobalt for smelting low-carbon high-aluminum in a large vacuum induction furnace can be solved, harmful gas can be controlled at extremely low content, meanwhile, the purity of steel is ensured, the requirement of the harsh use environment of the low-carbon high-aluminum high-temperature alloy containing niobium on the purity is met, and the comprehensive performance and stability of the product are improved.
Description
Technical Field
The invention relates to the field of vacuum smelting of high-temperature alloy, in particular to a low-carbon high-aluminum niobium-containing cobalt-based high-temperature alloy and a preparation method thereof.
Background
The high-temperature alloy takes a plurality of elements such as iron, nickel, cobalt, chromium and the like as a matrix, is strengthened by solid solution of tungsten and the like, and precipitates gamma through niobium, aluminum, titanium and the like ` 、γ `` StrengtheningThe metal material can work for a long time under the action of high temperature above 600 ℃ and certain stress, and is widely applied to high-end parts such as turbine discs, combustion chambers, blades, casings, fasteners and the like of aeroengines and industrial gas turbines. Wherein GH6783 is an oxidation-resistant low-expansion cobalt-based superalloy, al, cr and Nb are added, and compared with the traditional superalloy of In909 series, the GH6783 alloy greatly improves the content of Al In the alloy to form beta (NiAl) phase, thereby improving the stress acceleration grain boundary oxidation (SAGDO) resistance of the alloy. Meanwhile, a small amount of Cr element is added to ensure that the thermal expansion coefficient of the alloy is not greatly improved, but the oxidation resistance of the alloy is improved together with Al element, and the alloy still has excellent comprehensive performance at 700 ℃, the thermal expansion coefficient is 20 percent lower than that of IN718, the oxidation resistance is excellent, the temperature is up to 704 ℃, the stress acceleration grain boundary oxidation resistance is equivalent to that of IN718, and the alloy is obviously superior to that of IN909, and the density is 7.81g/cm 3 5% lower than IN718, IN909, has certain strength to weight ratio advantages, and the manufacturing/processing characteristics are comparable to IN718, less restrictive than IN 909. The alloy has high purity requirement because of the harsh use environment. Oxygen is used as a harmful impurity element in the high-temperature alloy, oxide inclusion is easily formed by oxygen-philic metal element, nitride inclusion is formed when the nitrogen content is higher, the inclusion is difficult to eliminate in the later smelting or heat treatment process, and is easily used as a crack initiation source and a crack propagation channel in the service process of the high-temperature alloy, so that the core mechanical properties such as durability, fatigue and creep of the high-temperature alloy can be reduced, and a large number of researches show that reducing the oxygen, nitrogen and inclusion content in the alloy and improving the purity is an important strategy for improving the comprehensive performance and stability of the high-temperature alloy.
However, the GH6783 cobalt-based superalloy has poor carbon deoxidization and denitrification effects in the vacuum smelting process due to the fact that the content of C is lower than or equal to 0.03%, the content of Al is higher than 5.0-6.0%, particularly a large vacuum induction furnace (nominal capacity of 12 tons), a molten steel pool is deep, the static pressure of molten steel is high, the content of carbon is low, the density of molten steel is low, the molten steel floats on the surface of an alloy liquid slightly, good deoxidization and denitrification effects are difficult to achieve, the control of impurities is influenced after deoxidization is carried out by adding Al, in addition, cr and Nb are added into the GH6783 cobalt-based superalloy, but due to the fact that Cr and Nb are originalThe material often carries more gas elements, and if the gas elements are not removed as much as possible, the purity of the alloy ingot is lower. The Chinese patent CN201810316210.X discloses a vacuum induction furnace smelting process of high-aluminum high-temperature alloy GH6783, which adopts the steps of feeding materials according to the sequence of aluminum, titanium and niobium after the refining period of complete melting, and ensures that the oxygen content is less than 15 multiplied by 10 by controlling the gas content before adding aluminum -6 Nitrogen content of less than 20 x 10 -6 The method comprises the steps of carrying out a first treatment on the surface of the The temperature before adding aluminum is controlled to 1480-1500 ℃, aluminum is added in two to three batches, and stirring is carried out for 5-10 min after each addition, so that the yield of aluminum element is stably controlled, and excessive formation of aluminum-containing inclusions is effectively avoided. The patent adopts the steps of feeding materials according to the sequence of aluminum, titanium and niobium after the refining period of complete melting is finished, the problems of oxidizing and removing the aluminum by the gas content carried in the titanium and niobium raw materials exist in the steps of adding aluminum and then adding titanium and niobium, and in addition, the patent does not disclose how to realize the oxygen content of less than 15 multiplied by 10 before adding aluminum -6 Nitrogen content of less than 20 x 10 -6 In particular to a large vacuum induction furnace.
Based on this, the prior art still remains to be improved.
Disclosure of Invention
In view of the above, the embodiment of the invention aims to provide a low-carbon high-aluminum niobium-containing cobalt-based superalloy and a preparation method thereof, and by using the technical scheme of the invention, the problem of purity control of induction ingot oxygen, nitrogen, nonmetallic inclusion and the like of a large vacuum induction furnace smelting low-carbon high-aluminum niobium-containing cobalt-based superalloy can be solved, harmful gas can be controlled at extremely low content, meanwhile, the purity of steel is ensured, the requirement of harsh use environment of the low-carbon high-aluminum niobium-containing superalloy on purity is met, and the comprehensive performance and stability of products are improved.
Based on the above object, an aspect of the embodiment of the present invention provides a method for preparing a low-carbon high-aluminum niobium-containing cobalt-based superalloy, comprising the steps of:
and (3) a batching procedure: selecting graphite, ferroboron, metal Cr, metal Nb, sponge Ti, metal Al, ni plates, pure Fe and Co plates, proportioning according to the mass percentage of preset chemical components, and controlling the total oxygen content brought in raw materials to be lower than a first preset value and the nitrogen content to be lower than a second preset value;
and (3) charging: charging the raw materials according to two batches under vacuum after the material proportioning is finished;
and (3) a melting procedure: after the charging is completed, power transmission melting is started under the condition that the vacuum degree is a third preset value, the first batch of raw materials are melted and then stirred for a first preset time at preset power frequency, and the second batch of raw materials are melted and then stirred for the first preset time at preset power frequency;
refining: controlling the vacuum degree in the refining period to be a fourth preset value after stirring is finished, transmitting electricity, heating to a fifth preset value, refining for a second preset time, and sampling and analyzing the alloy gas content after refining is finished;
deoxidizing and alloying process: after refining, power is cut off, temperature is lowered, all sponge Ti and all metal Al are added for deoxidization alloying after alloy solidification, then power is transmitted, temperature is raised to a sixth preset value, stirring and heat preservation are carried out for a third preset time, argon is filled, and ferroboron is added;
casting procedure: and tapping with electricity, wherein the casting temperature is a seventh preset value.
According to one embodiment of the invention, in the batching process, raw materials are prepared according to the following weight percentages of C less than or equal to 0.03%, mn less than or equal to 0.50%, si less than or equal to 0.50%, P less than or equal to 0.015%, S less than or equal to 0.005%, cu less than or equal to 0.5%, and B:0.003-0.012%, cr:2.5-3.5%, nb:2.5-3.5%, ti:0.1-0.40%, al:5.0-6.0%, ni:26-30%, fe:24-27% of Co and the balance of Co, and controlling the total oxygen content in raw materials to be less than or equal to 0.03% and the nitrogen content to be less than or equal to 0.002%.
According to one embodiment of the invention, in the charging process, all Ni plates, all graphite, all metallic Cr, all metallic Nb and all pure Fe are added in sequence in a first batch, all Co plates are added in a second batch, all sponge Ti and all metallic Al are added at the same time after refining is finished, and all ferroboron is added after argon filling.
According to one embodiment of the invention, in the melting process, three-stage pump vacuum pumping is adopted after the charging is completed, power transmission melting is started under the condition that the vacuum degree is less than or equal to 0.5Pa, the power transmission power of the first 30 mm is 300-500Kw, then the power transmission is carried out by adopting the power transmission power of 1300-1700Kw, the power transmission power is reduced to 800-1200Kw after an alloy liquid molten pool is formed, 100Kw power frequency stirring is adopted for 30min after the first raw material is melted, and 100Kw power frequency stirring is adopted for 30min after the second raw material is melted.
According to one embodiment of the invention, in the refining process, the vacuum degree is controlled to be less than or equal to 0.1Pa in the refining period, the power is transmitted, the temperature is increased to 1478-1498 ℃ for refining, the refining time is 20-50min, and the alloy gas content is sampled and analyzed after the refining is finished.
According to one embodiment of the invention, in the deoxidizing alloying process, the vacuum degree is controlled to be less than or equal to 0.1Pa, the temperature is reduced by power failure, all sponge Ti and all metal Al are added for deoxidizing alloying after the alloy is solidified, then power is transmitted and the temperature is raised to 1458-1478 ℃, stirring and heat preservation are carried out for 30min, and then ferroboron is added after argon of 6700Pa is filled.
According to one embodiment of the invention, in the casting process, the charged steel is tapped at a casting temperature of 1458-1478 ℃.
Another aspect of the embodiment of the invention provides a low-carbon high-aluminum niobium-containing cobalt-based superalloy, comprising the following components in percentage by mass:
less than or equal to 0.03 percent of C, less than or equal to 0.50 percent of Mn, less than or equal to 0.50 percent of Si, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.5 percent of Cu, and B:0.003-0.012%, cr:2.5-3.5%, nb:2.5-3.5%, ti:0.1-0.40%, al:5.0-6.0%, ni:26-30%, fe:24-27%, and the balance of Co and unavoidable impurities.
According to one embodiment of the invention, the content of oxygen in the unavoidable impurities is less than or equal to 0.0005% and the content of nitrogen is less than or equal to 0.0008% in mass percent.
According to one embodiment of the invention, the number of nonmetallic inclusions in a unit area of the low-carbon high-aluminum niobium-containing cobalt-based superalloy is less than or equal to 35/mm 2 。
The invention has the following beneficial technical effects: the preparation method of the low-carbon high-aluminum niobium-containing cobalt-based superalloy provided by the embodiment of the invention comprises the following steps of: selecting graphite, ferroboron, metal Cr, metal Nb, sponge Ti, metal Al, ni plates, pure Fe and Co plates, proportioning according to the mass percentage of preset chemical components, and controlling the total oxygen content brought in raw materials to be lower than a first preset value and the nitrogen content to be lower than a second preset value; and (3) charging: charging the raw materials according to two batches under vacuum after the material proportioning is finished; and (3) a melting procedure: after the charging is completed, power transmission melting is started under the condition that the vacuum degree is a third preset value, the first batch of raw materials are melted and then stirred for a first preset time at preset power frequency, and the second batch of raw materials are melted and then stirred for the first preset time at preset power frequency; refining: controlling the vacuum degree in the refining period to be a fourth preset value after stirring is finished, transmitting electricity, heating to a fifth preset value, refining for a second preset time, and sampling and analyzing the alloy gas content after refining is finished; deoxidizing and alloying process: after refining, power is cut off, temperature is lowered, all sponge Ti and all metal Al are added for deoxidization alloying after alloy solidification, then power is transmitted, temperature is raised to a sixth preset value, stirring and heat preservation are carried out for a third preset time, argon is filled, and ferroboron is added; casting procedure: according to the technical scheme that the electrified tapping is carried out, the casting temperature is a seventh preset value, the problem of controlling the purity of oxygen, nitrogen, nonmetallic inclusion and the like of a high-temperature alloy induction ingot containing niobium and cobalt in a large vacuum induction furnace smelting low-carbon high-aluminum can be solved, harmful gas can be controlled at extremely low content, meanwhile, the purity of steel is guaranteed, the requirement of the harsh use environment of the low-carbon high-aluminum high-temperature alloy containing niobium on the purity is met, and the comprehensive performance and stability of the product are improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention and that other embodiments may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for preparing a low carbon, high aluminum, niobium-containing cobalt-based superalloy in accordance with an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
It should be understood that the embodiments of the invention shown in the exemplary embodiments are only illustrative. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art will readily appreciate that many modifications are possible without materially departing from the teachings of the subject matter of this disclosure. Accordingly, all such modifications are intended to be included within the scope of present invention. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and parameters of the exemplary embodiments without departing from the spirit of the present inventions.
In view of the above, the first aspect of the embodiments of the present invention provides an embodiment of a method for preparing a low-carbon high-aluminum niobium-containing cobalt-based superalloy. Fig. 1 shows a schematic flow chart of the method.
As shown in fig. 1, the method may include the steps of:
s1, a batching process: selecting graphite, ferroboron, metal Cr, metal Nb, sponge Ti, metal Al, ni plate, pure Fe and Co plate, proportioning according to the mass percentage of preset chemical components, and controlling the total oxygen content brought in raw materials to be lower than a first preset value and the nitrogen content to be lower than a second preset value. The raw materials are mixed according to the proportion of less than or equal to 0.03 percent of C, less than or equal to 0.50 percent of Mn, less than or equal to 0.50 percent of Si, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.5 percent of Cu and less than or equal to B:0.003-0.012%, cr:2.5-3.5%, nb:2.5-3.5%, ti:0.1-0.40%, al:5.0-6.0%, ni:26-30%, fe:24-27% of Co and the balance of Co, and controlling the total oxygen content in raw materials to be less than or equal to 0.03% and the nitrogen content to be less than or equal to 0.002%.
S2, charging procedure: after the dosing is completed, the raw materials are charged in two batches under vacuum. All Ni plates, all graphite, all metal Cr, all metal Nb and all pure Fe are sequentially added during the first batch charging, the second batch charging is carried out after the melting process is carried out, all Co plates are added during the second batch charging, all sponge Ti and all metal Al are simultaneously added after the refining is finished, and all ferroboron is added after argon filling.
S3, melting procedure: and after the charging is completed, power transmission melting is started under the condition that the vacuum degree is a third preset value, the first preset time is adopted for stirring at the preset power frequency after the first batch of raw materials are melted, and the first preset time is adopted for stirring at the preset power frequency after the second batch of raw materials are melted. And after the first charging is finished, adopting a three-stage pump to vacuumize, starting to transmit power and melt under the condition that the vacuum degree is less than or equal to 0.5Pa, transmitting power at the front 30 mm under the condition that the power transmission power is 300-500Kw, transmitting power at the front 1300-1700Kw, reducing the power transmission power to 800-1200Kw after an alloy liquid molten pool is formed, stirring for 30min at 100Kw power frequency after the first raw material is melted, then carrying out the second charging, and carrying out a melting process under the condition that the power transmission power is 800-1200Kw, and stirring for 30min at 100Kw power frequency after the second raw material is melted.
S4 refining: and after the stirring is finished, controlling the vacuum degree in the refining period to be a fourth preset value, transmitting electricity, heating to a fifth preset value, refining for a second preset time, and sampling and analyzing the alloy gas content after the refining is finished. Controlling the vacuum degree in the refining period to be less than or equal to 0.1Pa, transmitting power, heating to 1478-1498 ℃ for refining for 20-50min, and sampling and analyzing the alloy gas content after the refining is finished.
S5 deoxidizing and alloying process: and after refining, cutting power, cooling, adding all sponge Ti and all metal Al for deoxidization alloying after alloy solidification, then feeding power, heating to a sixth preset value, stirring, preserving heat for a third preset time, and adding ferroboron after filling argon. And controlling the vacuum degree to be less than or equal to 0.1Pa during deoxidization alloying, cooling in a power failure, adding all sponge Ti and all metal Al for deoxidization alloying after alloy solidification, then transmitting power and heating to 1458-1478 ℃, stirring and preserving heat for 30min, and then adding ferroboron after filling argon of 6700 Pa.
S6, casting: and tapping with electricity, wherein the casting temperature is a seventh preset value. Tapping with electricity, and keeping the casting temperature at 1458-1478 ℃.
By using the technical scheme of the invention, the problem of controlling the purity of oxygen, nitrogen, nonmetallic inclusion and the like of a high-temperature alloy induction ingot containing niobium and cobalt for smelting low-carbon high-aluminum in a large vacuum induction furnace can be solved, harmful gas can be controlled at extremely low content, meanwhile, the purity of steel is ensured, the requirement of the harsh use environment of the low-carbon high-aluminum high-temperature alloy containing niobium on the purity is met, and the comprehensive performance and stability of the product are improved.
In a preferred embodiment of the invention, in the batching process, the raw materials are prepared according to the following weight percentages of C less than or equal to 0.03%, mn less than or equal to 0.50%, si less than or equal to 0.50%, P less than or equal to 0.015%, S less than or equal to 0.005%, cu less than or equal to 0.5%, and B:0.003-0.012%, cr:2.5-3.5%, nb:2.5-3.5%, ti:0.1-0.40%, al:5.0-6.0%, ni:26-30%, fe:24-27% of Co and the balance of Co, and controlling the total oxygen content in raw materials to be less than or equal to 0.03% and the nitrogen content to be less than or equal to 0.002%. Selecting high-purity graphite, ferroboron, metal Cr, metal Nb, sponge Ti, metal Al, ni plate, pure Fe, co plate and other raw materials, carrying out surface treatment, and then carrying out batching according to the chemical component requirements of the low-carbon high-aluminum niobium-containing cobalt-based superalloy GH6783, wherein the components are as above mass percent, the requirements of the purity of oxygen, nitrogen and the like of various raw materials are required to be analyzed, and the total carried oxygen and nitrogen content of all the raw materials obtained by vacuum induction smelting GH6783 are respectively recorded as T O total 、T N total And control T O total ≤0.03%、T N total Less than or equal to 0.002%, T carried in by raw materials must be controlled O total 、T N total The content is because if the raw materials are brought into excessive gas elements, the residual oxygen and nitrogen content in the alloy liquid after the melting and refining are over is higher, a large amount of nonmetallic inclusion formed in the deoxidization alloying process remains in the alloy liquid, and high-purity smelting cannot be realized. The high-purity graphite is selected for carbon matching to reduce the high gas content brought by raw materials such as graphite electrodes, the carbon matching amount is higher than the chemical composition control requirement of GH6783, the sufficient carbon matching amount is controlled, the carbon content is ensured to meet the requirement, the sufficient carbon is ensured to react with oxygen under the vacuum condition for deoxidization and oxide inclusion in the reduced alloy liquid, and the carbon matching amount is controlled according to the following formula: carbon distribution= (alloy target carbon content +3/4*T) O total )/0.9。
In a preferred embodiment of the invention, in the charging process, the first batch is charged with all Ni plates, all graphite, all Cr metal, all Nb metal, all Fe pure in sequence, the second batch is charged with all Co plates, and after the refining is completed, all Ti sponge and all Al metal are added simultaneously, and after argon is filled, all ferroboron is added. After the material proportioning is finished, charging is carried out in batches under the vacuum condition, and the materials are added in batches along with the furnace charge, wherein all Ni plates, all high-purity graphite, all metal Cr, all metal Nb and all pure Fe are sequentially added in the first batch; and adding all Co plates in the second batch, simultaneously adding all sponge Ti and all metal Al after refining, and adding all ferroboron after Ar filling. The raw materials of Cr and Nb with poor purity are added into a vacuum induction furnace along with the furnace, a molten pool formed after the first batch is melted is shallow, the static pressure of molten steel is small, gas is easier to remove, the low-carbon high-temperature alloy is unfavorable for the vacuum carbon-oxygen reaction, the degassing effect is poor, high-purity graphite is fully added along with the furnace, the concentration of carbon content in alloy liquid in the melting process is improved, the degassing in the vacuum process is more favorable, and a reasonable charging sequence ensures that the follow-up smelting process realizes efficient degassing and nonmetallic inclusion removal.
In a preferred embodiment of the invention, in the melting process, three-stage pump vacuum pumping is adopted after the charging is completed, power transmission melting is started under the condition that the vacuum degree is less than or equal to 0.5Pa, the power transmission power of the first 30 mm is 300-500Kw, then the power transmission is carried out by adopting the power transmission power of 1300-1700Kw, the power transmission power is reduced to 800-1200Kw after an alloy liquid molten pool is formed, 100Kw power frequency stirring is adopted for 30min after the first raw material is melted, and 100Kw power frequency stirring is adopted for 30min after the second raw material is melted. After the charging is finished, three-stage pump vacuumizing is adopted, a higher vacuum degree is ensured in a melting period, power transmission melting is started under the condition that the vacuum degree is less than or equal to 0.5Pa, the first 30 mm controls a small-power transmission protection crucible with 300-500Kw of power transmission, then 1300-1700Kw of high-power transmission is adopted until the raw materials at the bottom of the crucible are melted to form an alloy liquid molten pool, the main purpose is that the solid raw materials cannot be degassed, high-power supply is adopted to facilitate shortening of a smelting period, and after the alloy liquid molten pool is formed, the power transmission is reduced to 800-1200Kw and is slowly melted until all the raw materials are melted down. The electric power is reduced, on one hand, the furnace burden can be fully utilized under the high vacuum condition, the furnace burden is slowly melted layer by layer from the surface to the inner, so that the gas dissolved in the molten steel escapes from the molten steel and is pumped out of the furnace for removal, on the other hand, the whole carbon content is added along with the furnace, so that carbon and oxygen can be fully reacted, and generated carbon monoxide bubbles are removed under the vacuum condition, thereby being beneficial to the removal of the gas. After each batch of furnace burden is melted down, 100Kw of power frequency stirring is adopted for 30min, the stirring of molten steel is increased in the melting period, the static pressure of molten steel at the bottom of a large vacuum induction furnace molten pool is reduced, the dynamic condition of degassing is improved, the mass transfer coefficient of oxygen and nitrogen in the molten steel is increased, and the degassing speed is accelerated.
In a preferred embodiment of the invention, in the refining process, the vacuum degree in the refining period is controlled to be less than or equal to 0.1Pa, the power is transmitted and the temperature is increased to 1478-1498 ℃ for refining, the refining time is 20-50min, and the alloy gas content is sampled and analyzed after the refining is finished. After the furnace burden is completely melted and stirred at the power frequency, the vacuum degree in the refining period is controlled to be less than or equal to 0.1Pa, the power is transmitted to be heated to 1478-1498 ℃ for refining for 20-50min, the high vacuum degree and the low temperature are adopted for refining, and meanwhile, the reasonable refining time is controlled, so that the method can deeply deoxidize, denitrify and reduce oxide inclusions in molten steel, and simultaneously prevent the decomposition and oxygen supply of the alkaline magnesia-alumina spinel refractory crucible. After reasonable technological measures are adopted in the melting and refining processes, the oxygen and nitrogen content in the alloy is removed to a high-purity purification level with the oxygen content less than or equal to 0.0007 percent and the nitrogen content less than or equal to 0.0008 percent.
In a preferred embodiment of the invention, in the deoxidizing alloying process, the vacuum degree is controlled to be less than or equal to 0.1Pa and the temperature is reduced by power failure during deoxidizing alloying, all sponge Ti and all metal Al are added for deoxidizing alloying after the alloy is solidified, then power is transmitted and the temperature is raised to 1458-1478 ℃, stirring and heat preservation are carried out for 30min, and then ferroboron is added after the argon of 6700Pa is filled. The vacuum degree is controlled to be less than or equal to 0.1Pa in the deoxidization alloying period, power is cut off and the temperature is reduced after refining is finished, all sponge Ti and all metal Al are added simultaneously for deoxidization alloying after alloy solidification, the residual gas content in alloy liquid is further removed by using Ti and Al, then power is transmitted and heated to 1458-1478 ℃, stirring and heat preservation are carried out for 30min, oxide inclusion generated by strong-reducibility reduction deoxidization of carbon under the high vacuum condition is utilized again, and ferroboron is added after Ar of 6700Pa is filled. After smelting, the power is cut off, the temperature is lowered, and after the alloy is solidified, ti and Al are added for deoxidization alloying, so that the active elements such as Ti, al and the like are prevented from splashing under the liquid state condition, and the yield of the Ti and Al elements is improved.
In a preferred embodiment of the invention, in the casting process, the steel is tapped with electricity, the casting temperature being 1458-1478 ℃.
The method of the invention has the advantages that: through reasonable matching of processes such as batching, charging, melting, refining, deoxidizing alloying, pouring and the like, a vacuum induction smelting process of low-carbon high-aluminum niobium-containing high-temperature alloy is developed, the problem of controlling the purity of oxygen, nitrogen, nonmetallic inclusion and the like of a large vacuum induction furnace smelting low-carbon high-aluminum niobium-containing cobalt-based high-temperature alloy can be solved, and harmful gas can be controlled at extremely low content: oxygen content is less than or equal to 0.0005%, and nitrogen content is less than or equal to 0.0008%; meanwhile, the purity of the steel is ensured, and the number of nonmetallic inclusions in unit area is less than or equal to 35/mm 2 The method comprises the steps of carrying out a first treatment on the surface of the Meets the requirement of the harsh use environment of the low-carbon high-aluminum niobium-containing high-temperature alloy on the purity, and improves the comprehensive performance and stability of the product.
Example 1
This example is a 12 ton vacuum induction furnace for smelting GH6783 cobalt-based superalloy using the method of the invention. The GH6783 comprises the following chemical components in percentage by mass: less than or equal to 0.03 percent of C, less than or equal to 0.50 percent of Mn, less than or equal to 0.50 percent of Si, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.5 percent of Cu, and B:0.003-0.012%, cr:2.5-3.5%, nb:2.5-3.5%, ti:0.1-0.40%, al:5.0-6.0%, ni:26-30%, fe:24-27%, and the balance of Co.
Mainly comprises the following steps:
(1) and (3) batching: selecting high-purity graphite, ferroboron, metal Cr, metal Nb, sponge Ti, metal Al, ni plate, pure Fe, co plate and other raw materials, carrying out surface treatment, then carrying out batching according to the chemical component requirements of the low-carbon high-aluminum niobium-containing cobalt-based superalloy GH6783, analyzing and selecting the purity of oxygen, nitrogen and the like of various raw materials, and controlling T O total 0.03%、T N total 0.002% of high purity graphite is selected for carbon matching, and the carbon matching amount= (alloy target carbon content +3/4*T) O total )/0.9。
(2) And (2) charging: and (3) charging in batches under the vacuum condition after the material proportioning is finished, adopting two batches to be added along with the furnace burden, sequentially adding all Ni plates, all high-purity graphite, all metal Cr, all metal Nb and all pure Fe in the first batch, adding all Co plates in the second batch, simultaneously adding all sponge Ti and all metal Al after refining is finished, and adding all ferroboron after Ar charging.
(3) Melting: after the charging is completed, three-stage pump vacuumizing is adopted, power transmission melting is started under the condition of the vacuum degree of 0.5Pa, the power transmission is kept for 30min, then 1700Kw of high-power transmission is adopted until the raw materials at the bottom of the crucible are melted to form an alloy liquid molten pool, after the alloy liquid molten pool is formed, the power is reduced to 1200Kw and is slowly melted until the alloy liquid molten pool is completely melted along with the furnace burden, the first batch of all Ni plates, all high-purity graphite, all metal Cr, all metal Nb and all pure Fe are melted along with the furnace burden and are stirred for 30min by adopting 100Kw power frequency, then a second batch of all Co plates along with the furnace burden are added under the vacuum condition, and the slow melting is continuously adopted by adopting 1200Kw of power until the alloy liquid molten pool is completely melted along with the furnace burden, and the stirring is carried out for 30min by adopting 100Kw power frequency.
(4) Refining: after all the furnace burden is melted and stirred at the power frequency, the vacuum degree in the refining stage is controlled to be 0.1Pa, the power is transmitted, the temperature is increased to 1498 ℃ for refining, and the refining time is 20min.
(5) Deoxidizing and alloying: sampling, analyzing and refining, wherein the alloy gas content is 0.0007 percent, the oxygen content is 0.0008 percent, the vacuum degree is controlled to be less than or equal to 0.1Pa, the power is cut off and the temperature is reduced after the refining is finished, all sponge Ti and all metal Al are simultaneously added for deoxidization alloying after the alloy is solidified, then power is transmitted and the temperature is raised to 1478 ℃, stirring and heat preservation are carried out for 30min, and 6700Pa Ar is filled and ferroboron is added.
(6) Casting: tapping with electricity, and casting at 1478 ℃.
The GH6783 low-carbon high-aluminum niobium-containing cobalt-based superalloy smelted by adopting the process in a 12-ton vacuum induction furnace samples a vacuum induction ingot to perform oxygen and nitrogen analysis and scan and detect the density of nonmetallic inclusions, wherein the oxygen content in the vacuum induction ingot is 0.0005%, the nitrogen content is 0.0008%, and the number of nonmetallic inclusions per unit area is 34/mm 2 Meets the requirement of the harsh use environment of the low-carbon high-aluminum niobium-containing high-temperature alloy on the purity, and improves the comprehensive performance and stability of the product.
Example 2
The embodiment is to apply the vacuum induction smelting process of the low-carbon high-aluminum niobium-containing high-temperature alloy to smelt GH6783 cobalt-based high-temperature alloy in a 12-ton vacuum induction furnace. The GH6783 comprises the following chemical components in percentage by mass: less than or equal to 0.03 percent of C, less than or equal to 0.50 percent of Mn, less than or equal to 0.50 percent of Si, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.5 percent of Cu, and B:0.003-0.012%, cr:2.5-3.5%, nb:2.5-3.5%, ti:0.1-0.40%, al:5.0-6.0%, ni:26-30%, fe:24-27%, and the balance of Co.
Mainly comprises the following steps:
(1) and (3) batching: selecting high-purity graphite, ferroboron, metal Cr, metal Nb, sponge Ti, metal Al, ni plate, pure Fe, co plate and other raw materials, carrying out surface treatment, then carrying out batching according to the chemical component requirements of the low-carbon high-aluminum niobium-containing cobalt-based superalloy GH6783, analyzing and selecting the purity of oxygen, nitrogen and the like of various raw materials, and controlling T O total 0.02%、T N total 0.0015% of carbon is prepared by selecting high-purity graphite, and the carbon preparation amount= (alloy target carbon content +3/4*T) O total )/0.9。
(2) And (2) charging: and (3) charging in batches under the vacuum condition after the material proportioning is finished, adopting two batches to be added along with the furnace burden, sequentially adding all Ni plates, all high-purity graphite, all metal Cr, all metal Nb and all pure Fe in the first batch, adding all Co plates in the second batch, simultaneously adding all sponge Ti and all metal Al after refining is finished, and adding all ferroboron after Ar charging.
(3) Melting: after the charging is completed, three-stage pump vacuum pumping is adopted, power transmission and melting are started under the condition of the vacuum degree of 0.3Pa, the power transmission of the first 30 mm is carried out, 400Kw is kept for 30min, then 1500Kw of high-power transmission is adopted until the raw materials at the bottom of the crucible are melted to form an alloy liquid molten pool, after the alloy liquid molten pool is formed, the power is reduced to 1000Kw and is slowly melted until the alloy liquid molten pool is completely melted along with the furnace burden, the first batch of all Ni plates, all high-purity graphite, all metal Cr, all metal Nb and all pure Fe along with the furnace burden are melted, then 100Kw power frequency stirring is adopted for 30min, then the second batch of all Co plates along with the furnace burden are added under the vacuum condition, and the slow melting with 1000Kw power is continuously adopted until the alloy liquid molten pool is completely melted along with the furnace burden, and 100Kw power frequency stirring is adopted for 30min.
(4) Refining: after all the furnace burden is melted and stirred at the power frequency, the vacuum degree in the refining stage is controlled to be 0.08Pa, the power is transmitted, the temperature is increased to 1488 ℃ for refining, and the refining time is 35min.
(5) Deoxidizing and alloying: sampling, analyzing and refining, wherein the content of alloy gas, the oxygen content and the nitrogen content are 0.0005% and 0.0005%, controlling the vacuum degree to be less than or equal to 0.1Pa, powering off and cooling after refining, adding all sponge Ti and all metal Al to deoxidize and alloy after alloy solidification, then transmitting power and heating to 1468 ℃, stirring and preserving heat for 30min, and adding ferroboron after filling Ar of 6700 Pa.
(6) Casting: and tapping with electricity, wherein the casting temperature is 1468 ℃.
The GH6783 low-carbon high-aluminum niobium-containing cobalt-based superalloy smelted by adopting the process in a 12-ton vacuum induction furnace samples a vacuum induction ingot to perform oxygen and nitrogen analysis and scan and detect the density of nonmetallic inclusions, wherein the oxygen content in the vacuum induction ingot is 0.0004%, the nitrogen content in the vacuum induction ingot is 0.0005%, and the number of nonmetallic inclusions per unit area is 26/mm 2 Meets the requirement of the harsh use environment of the low-carbon high-aluminum niobium-containing high-temperature alloy on the purity, and improves the comprehensive performance and stability of the product.
Example 3
The embodiment is to apply the vacuum induction smelting process of the low-carbon high-aluminum niobium-containing high-temperature alloy to smelt GH6783 cobalt-based high-temperature alloy in a 12-ton vacuum induction furnace. The GH6783 comprises the following chemical components in percentage by mass: less than or equal to 0.03 percent of C, less than or equal to 0.50 percent of Mn, less than or equal to 0.50 percent of Si, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.5 percent of Cu, and B:0.003-0.012%, cr:2.5-3.5%, nb:2.5-3.5%, ti:0.1-0.40%, al:5.0-6.0%, ni:26-30%, fe:24-27%, and the balance of Co.
Mainly comprises the following steps:
(1) and (3) batching: selecting high-purity graphite, ferroboron, metal Cr, metal Nb, sponge Ti, metal Al, ni plate, pure Fe, co plate and other raw materials, carrying out surface treatment, then carrying out batching according to the chemical component requirements of the low-carbon high-aluminum niobium-containing cobalt-based superalloy GH6783, analyzing and selecting the purity of oxygen, nitrogen and the like of various raw materials, and controlling T O total 0.01%、T N total 0.0012% of high-purity graphite is selected for carbon matching, and the carbon matching amount= (alloy target carbon content +3/4*T) O total )/0.9。
(2) And (2) charging: and (3) charging in batches under the vacuum condition after the material proportioning is finished, adopting two batches to be added along with the furnace burden, sequentially adding all Ni plates, all high-purity graphite, all metal Cr, all metal Nb and all pure Fe in the first batch, adding all Co plates in the second batch, simultaneously adding all sponge Ti and all metal Al after refining is finished, and adding all ferroboron after Ar charging.
(3) Melting: after the charging is completed, three-stage pump vacuum pumping is adopted, power transmission and melting are started under the condition of the vacuum degree of 0.25Pa, the power transmission of the first 30 mm is kept for 30min, then high-power transmission of 1300Kw is adopted until the raw materials at the bottom of the crucible are melted to form an alloy liquid molten pool, after the alloy liquid molten pool is formed, the power is reduced to 800Kw and is slowly melted until the alloy liquid molten pool is completely melted along with the furnace burden, the first batch of all Ni plates, all high-purity graphite, all metal Cr, all metal Nb and all pure Fe along with the furnace burden are melted, then 100Kw power frequency stirring is adopted for 30min, then the second batch of all Co plates along with the furnace burden are added under the vacuum condition, and the slow melting with 800Kw power is continuously adopted until the alloy liquid molten pool is completely melted along with the furnace burden, and 100Kw power frequency stirring is adopted for 30min.
(4) Refining: after all the furnace burden is melted and stirred at the power frequency, the vacuum degree in the refining stage is controlled to be 0.05Pa, the power is transmitted, the temperature is increased to 1478 ℃ for refining, and the refining time is 50min.
(5) Deoxidizing and alloying: sampling, analyzing and refining, wherein the alloy gas content is 0.0004 percent, the oxygen content is 0.0005 percent, the vacuum degree is controlled to be less than or equal to 0.1Pa, the power is cut off and the temperature is reduced after the refining is finished, all sponge Ti and all metal Al are simultaneously added for deoxidization alloying after the alloy is solidified, then power is transmitted and the temperature is raised to 1458 ℃, stirring and heat preservation are carried out for 30min, and 6700Pa Ar is filled and ferroboron is added.
(6) Casting: and tapping with electricity, wherein the casting temperature is 1458 ℃.
The GH6783 low-carbon high-aluminum niobium-containing cobalt-based superalloy smelted by adopting the process in a 12-ton vacuum induction furnace samples a vacuum induction ingot to perform oxygen and nitrogen analysis and scan and detect the density of nonmetallic inclusions, wherein the oxygen content in the vacuum induction ingot is 0.0003%, the nitrogen content in the vacuum induction ingot is 0.0005%, and the number of nonmetallic inclusions per unit area is 21/mm 2 Meets the requirement of the harsh use environment of the low-carbon high-aluminum niobium-containing high-temperature alloy on the purity, and improves the comprehensive performance and stability of the product.
In a second aspect of the embodiment of the invention, a low-carbon high-aluminum niobium-containing cobalt-based superalloy is provided, which is prepared by the above method and comprises the following components in percentage by mass:
less than or equal to 0.03 percent of C, less than or equal to 0.50 percent of Mn, less than or equal to 0.50 percent of Si, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.5 percent of Cu, and B:0.003-0.012%, cr:2.5-3.5%, nb:2.5-3.5%, ti:0.1-0.40%, al:5.0-6.0%, ni:26-30%, fe:24-27%, and the balance of Co and unavoidable impurities.
In a preferred embodiment of the present invention, the unavoidable impurities have an oxygen content of 0.0005% or less and a nitrogen content of 0.0008% or less in mass%.
In a preferred embodiment of the invention, the number of nonmetallic inclusions per unit area of the low-carbon high-aluminum niobium-containing cobalt-based superalloy is less than or equal to 35 per mm 2 。
It should be noted that, each component or step in each embodiment may be intersected, replaced, added, deleted, and thus, the combination formed by these reasonable permutation and combination transformations shall also belong to the protection scope of the present invention, and shall not limit the protection scope of the present invention to the embodiments.
The foregoing is an exemplary embodiment of the present disclosure, and the order in which the embodiments of the present disclosure are disclosed is merely for the purpose of description and does not represent the advantages or disadvantages of the embodiments. It should be noted that the above discussion of any of the embodiments is merely exemplary and is not intended to suggest that the scope of the disclosure of embodiments of the invention (including the claims) is limited to these examples and that various changes and modifications may be made without departing from the scope of the invention as defined in the claims. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements of the disclosed embodiments may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
Those of ordinary skill in the art will appreciate that: the above discussion of any embodiment is merely exemplary and is not intended to imply that the scope of the disclosure of embodiments of the invention, including the claims, is limited to such examples; combinations of features of the above embodiments or in different embodiments are also possible within the idea of an embodiment of the invention, and many other variations of the different aspects of the embodiments of the invention as described above exist, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, and the like, which are made within the spirit and principles of the embodiments of the invention, are included within the scope of the embodiments of the invention.
Claims (5)
1. The preparation method of the low-carbon high-aluminum niobium-containing cobalt-based superalloy is characterized by comprising the following steps of:
and (3) a batching procedure: selecting graphite, ferroboron, metal Cr, metal Nb, sponge Ti, metal Al, ni plate, pure Fe and Co plate, and mixing the raw materials according to the proportion of less than or equal to 0.03% of C, less than or equal to 0.50% of Mn, less than or equal to 0.50% of Si, less than or equal to 0.015% of P, less than or equal to 0.005% of S, less than or equal to 0.5% of Cu and less than or equal to 0.5% of B:0.003-0.012%, cr:2.5-3.5%, nb:2.5-3.5%, ti:0.1-0.40%, al:5.0-6.0%, ni:26-30%, fe:24-27% of Co, wherein the mass percentage of the rest is mixed, the total oxygen content in the raw materials is controlled to be less than or equal to 0.03%, and the nitrogen content is controlled to be less than or equal to 0.002%;
and (3) charging: charging raw materials according to two batches under a vacuum condition after the material proportioning is finished, sequentially adding all Ni plates, all graphite, all metal Cr, all metal Nb and all pure Fe into the first batch, and adding all Co plates into the second batch;
and (3) a melting procedure: adopting a three-stage pump to vacuumize after the first batch of raw materials are charged, starting to transmit power to melt under the condition that the vacuum degree is less than or equal to 0.5Pa, transmitting power of the first 30 mm is 300-500kW, transmitting power of 1300-1700kW, reducing the transmitting power to 800-1200kW after an alloy liquid molten pool is formed, stirring for 30min at 100kW power frequency after the first batch of raw materials are melted, then carrying out the second batch of raw materials, carrying out a melting process under the condition that the transmitting power is 800-1200kW, and stirring for 30min at 100kW power frequency after the second batch of raw materials are melted;
refining: controlling the vacuum degree in the refining period to be less than or equal to 0.1Pa after stirring is finished, transmitting power, heating to 1478-1498 ℃ for refining for 20-50min, and sampling and analyzing the alloy gas content after refining is finished;
deoxidizing and alloying process: controlling the vacuum degree to be less than or equal to 0.1Pa during deoxidization alloying, cooling in a power failure, adding all sponge Ti and all metal Al for deoxidization alloying after alloy solidification, then transmitting power and heating to 1458-1478 ℃, stirring and preserving heat for 30min, and then adding ferroboron after filling argon of 6700 Pa;
casting procedure: and tapping with electricity, wherein the casting temperature is a seventh preset value.
2. The method for producing a low-carbon high-aluminum niobium-containing cobalt-based superalloy according to claim 1, wherein in the casting step, the steel is tapped with electricity, and the casting temperature is 1458-1478 ℃.
3. The low-carbon high-aluminum niobium-containing cobalt-based superalloy is characterized in that the superalloy is prepared by the preparation method of any one of claims 1 to 2, and comprises the following components in percentage by mass:
less than or equal to 0.03 percent of C, less than or equal to 0.50 percent of Mn, less than or equal to 0.50 percent of Si, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.5 percent of Cu, and B:0.003-0.012%, cr:2.5-3.5%, nb:2.5-3.5%, ti:0.1-0.40%, al:5.0-6.0%, ni:26-30%, fe:24-27%, and the balance of Co and unavoidable impurities.
4. The low-carbon high-aluminum niobium-containing cobalt-based superalloy as claimed in claim 3, wherein the unavoidable impurities have an oxygen content of 0.0005% or less and a nitrogen content of 0.0008% or less in mass%.
5. The low-carbon high-aluminum niobium-cobalt-based superalloy according to claim 3, wherein the number of nonmetallic inclusions per unit area of the low-carbon high-aluminum niobium-cobalt-based superalloy is 35/mm or less 2 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311677681.0A CN117363913B (en) | 2023-12-08 | 2023-12-08 | Low-carbon high-aluminum niobium-containing cobalt-based superalloy and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311677681.0A CN117363913B (en) | 2023-12-08 | 2023-12-08 | Low-carbon high-aluminum niobium-containing cobalt-based superalloy and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117363913A CN117363913A (en) | 2024-01-09 |
| CN117363913B true CN117363913B (en) | 2024-03-08 |
Family
ID=89400727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311677681.0A Active CN117363913B (en) | 2023-12-08 | 2023-12-08 | Low-carbon high-aluminum niobium-containing cobalt-based superalloy and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117363913B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108531755A (en) * | 2018-04-10 | 2018-09-14 | 抚顺特殊钢股份有限公司 | A kind of vacuum induction furnace smelting technique of high aluminium profiles high temperature alloy GH6783 |
| CN111455199A (en) * | 2020-04-16 | 2020-07-28 | 江苏星火特钢有限公司 | Smelting process of high-temperature alloy vacuum induction furnace |
| CN112226651A (en) * | 2020-10-16 | 2021-01-15 | 中国航发北京航空材料研究院 | Alloy material for deformed turbine disc at 850 ℃ and preparation process |
| WO2021036225A1 (en) * | 2019-08-28 | 2021-03-04 | 北京钢研高纳科技股份有限公司 | Smelting process for high-niobium high-temperature alloy large-size cast ingot, and high-niobium high-temperature alloy large-size cast ingot |
| WO2021174726A1 (en) * | 2020-03-02 | 2021-09-10 | 北京钢研高纳科技股份有限公司 | Nickel-based deformed high-temperature alloy having high aluminum content and preparation method therefor |
| CN114317996A (en) * | 2021-12-08 | 2022-04-12 | 抚顺特殊钢股份有限公司 | Method for manufacturing low-gas-content high-titanium low-aluminum nickel-cobalt alloy electroslag remelting electrode |
-
2023
- 2023-12-08 CN CN202311677681.0A patent/CN117363913B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108531755A (en) * | 2018-04-10 | 2018-09-14 | 抚顺特殊钢股份有限公司 | A kind of vacuum induction furnace smelting technique of high aluminium profiles high temperature alloy GH6783 |
| WO2021036225A1 (en) * | 2019-08-28 | 2021-03-04 | 北京钢研高纳科技股份有限公司 | Smelting process for high-niobium high-temperature alloy large-size cast ingot, and high-niobium high-temperature alloy large-size cast ingot |
| WO2021174726A1 (en) * | 2020-03-02 | 2021-09-10 | 北京钢研高纳科技股份有限公司 | Nickel-based deformed high-temperature alloy having high aluminum content and preparation method therefor |
| CN111455199A (en) * | 2020-04-16 | 2020-07-28 | 江苏星火特钢有限公司 | Smelting process of high-temperature alloy vacuum induction furnace |
| CN112226651A (en) * | 2020-10-16 | 2021-01-15 | 中国航发北京航空材料研究院 | Alloy material for deformed turbine disc at 850 ℃ and preparation process |
| CN114317996A (en) * | 2021-12-08 | 2022-04-12 | 抚顺特殊钢股份有限公司 | Method for manufacturing low-gas-content high-titanium low-aluminum nickel-cobalt alloy electroslag remelting electrode |
Non-Patent Citations (1)
| Title |
|---|
| 30t EBT电弧炉-LF精炼炉生产铁路铸钢件的工艺研究;贾长江等;铸造设备与工艺(第02期);32-35 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117363913A (en) | 2024-01-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105803233B (en) | The smelting process of nickel-base alloy containing aluminium titanium boron zirconium | |
| CN102251194A (en) | Two-phase stainless steel cold-rolled sheet with good surface corrosion resistance, and preparation method thereof | |
| CN104164606B (en) | A kind of smelt iron Ohmax adds the method for aluminium | |
| CN109778053A (en) | A kind of vacuum metling technique of the high high titanium steel of manganese high alumina | |
| CN104060157A (en) | Hypereutectic high-chromium white cast iron and preparation method thereof | |
| CN114107826B (en) | Nickel-based high-temperature alloy and preparation method thereof | |
| CN114058952B (en) | High-strength antioxidant CNRE rare earth heat-resistant steel for grate plate of grate and preparation method thereof | |
| CN113106315B (en) | Nickel-chromium-aluminum alloy for heat-resisting 1200-degree heat exchange equipment and manufacturing method thereof | |
| CN105316592A (en) | High-strength high-tenacity gear steel and fabrication method thereof | |
| CN113637860A (en) | Preparation process of GH690 alloy | |
| CN117363913B (en) | Low-carbon high-aluminum niobium-containing cobalt-based superalloy and preparation method thereof | |
| CN112605557A (en) | HGH1131 welding wire and preparation method thereof | |
| CN112621022A (en) | ERNiCrMo-11 welding wire and preparation method thereof | |
| CN110257590B (en) | Method for refining inclusions in high-cleanliness rare earth electroslag steel | |
| CN107779555A (en) | The smelting process of super-low carbon stainless steel material | |
| CN117363960B (en) | Low-carbon aluminum-free high-niobium-iron-based superalloy and preparation method thereof | |
| CN116043068A (en) | GH4169 high-temperature alloy and smelting process thereof | |
| CN114032420B (en) | High-performance cast high-temperature alloy | |
| CN107739892A (en) | The vacuum metling technique of nickel-base cast superalloy | |
| CN116287812B (en) | Smelting method of aluminum-free high-temperature alloy | |
| CN105803232B (en) | The vacuum metling technique of nickel base superalloy containing aluminium titanium boron zirconium | |
| CN114921674B (en) | Vacuum induction melting method of 625 alloy | |
| CN117660810B (en) | High-purity high-temperature master alloy for variable-cycle gas engine turbine blade and preparation method and application thereof | |
| CN113005351B (en) | Smelting process of 1Mn18Cr18N steel with ultrahigh nitrogen element content | |
| CN108546867B (en) | Smelting method of casting blank of duplex stainless steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |