CN116574930A - Heat corrosion resistant directional superalloy master alloy and preparation method thereof - Google Patents
Heat corrosion resistant directional superalloy master alloy and preparation method thereof Download PDFInfo
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 47
- 239000000956 alloy Substances 0.000 title claims abstract description 47
- 230000007797 corrosion Effects 0.000 title claims abstract description 38
- 238000005260 corrosion Methods 0.000 title claims abstract description 38
- 229910000601 superalloy Inorganic materials 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000002893 slag Substances 0.000 claims abstract description 114
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 71
- 239000010959 steel Substances 0.000 claims abstract description 71
- 238000007872 degassing Methods 0.000 claims abstract description 49
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 38
- 230000023556 desulfurization Effects 0.000 claims abstract description 38
- 238000010079 rubber tapping Methods 0.000 claims abstract description 30
- 238000007670 refining Methods 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 238000002844 melting Methods 0.000 claims abstract description 9
- 230000008018 melting Effects 0.000 claims abstract description 9
- 238000007781 pre-processing Methods 0.000 claims abstract description 9
- 238000003723 Smelting Methods 0.000 abstract description 9
- 230000008092 positive effect Effects 0.000 description 11
- 239000007789 gas Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 229910052717 sulfur Inorganic materials 0.000 description 6
- 239000011593 sulfur Substances 0.000 description 6
- 239000012535 impurity Substances 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 230000003009 desulfurizing effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
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- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The application relates to the technical field of steel smelting, in particular to a hot corrosion resistant directional superalloy master alloy and a preparation method thereof. The method comprises the following steps: respectively preprocessing different slag materials to obtain a target slag system; wherein the target slag system has a set composition; melting raw materials, performing first degassing after the raw materials are melted down, and refining to obtain first molten steel; adding the target slag system into the first molten steel to carry out desulfurization until the target slag system is melted down, controlling the temperature of the first molten steel containing the target slag system in a melted down state, and carrying out second degassing to obtain second molten steel; tapping the second molten steel, controlling the tapping temperature, and then pouring to obtain the hot corrosion resistant directional superalloy master alloy. The application solves the technical problem of higher S content in the prior hot corrosion resistant directional superalloy master alloy.
Description
Technical Field
The application relates to the technical field of steel smelting, in particular to a hot corrosion resistant directional superalloy master alloy and a preparation method thereof.
Background
The heat corrosion resistant directional superalloy master alloy is a material for manufacturing directional blades in aeroengines and gas turbines, and the peak temperature (metal body temperature) of the operation of the blades of the aeroengines and gas turbines can be up to about 1000 ℃, so that the content of low-melting-point harmful elements S in the alloy is very strict, and the weight percentage of S in the master alloy is generally less than or equal to 0.001%, namely not more than 10ppm.
However, the S content in the current novel hot corrosion resistant directional superalloy master alloy is relatively high.
Disclosure of Invention
The application provides a hot corrosion resistant directional superalloy master alloy and a preparation method thereof, which are used for solving the technical problem that the S content in the existing hot corrosion resistant directional superalloy master alloy is higher.
In a first aspect, the present application provides a method for preparing a hot corrosion resistant directional superalloy master alloy, the method comprising:
respectively preprocessing different slag materials to obtain a target slag system; wherein the target slag system has a set composition;
melting raw materials, performing first degassing after the raw materials are melted down, and refining to obtain first molten steel;
adding the target slag system into the first molten steel to carry out desulfurization until the target slag system is melted down, controlling the temperature of the first molten steel containing the target slag system in a melted down state, and carrying out second degassing to obtain second molten steel;
tapping the second molten steel, controlling the tapping temperature, and then pouring to obtain the hot corrosion resistant directional superalloy master alloy.
Optionally, preprocessing different slag materials respectively to obtain a target slag system; wherein the target slag system has a set composition comprising:
respectively baking different slag materials, and controlling the baking temperature of the different slag materials to obtain a target slag system; wherein the target slag system has a set composition.
Optionally, the setting component includes: caO and CaF, wherein the ratio of the CaO to the CaF is 1:1-4.
Optionally, the baking temperature of the CaO is 500-800 ℃, and the baking temperature of the CaF is 200-500 ℃.
Optionally, the temperature of the first molten steel containing the target slag system in a molten state is 1600-1700 ℃.
Optionally, the second degassing time is 30-100 min.
Optionally, the tapping temperature is 1500-1600 ℃.
Optionally, the temperature of the first degassing is 1600-1700 ℃, and or the time of the first degassing is more than or equal to 30min.
Optionally, the temperature of the refining is 1500-1650 ℃, and or the refining time is 30-100 min.
In a second aspect, the present application provides a hot corrosion resistant directional superalloy master alloy prepared by the method of any of the embodiments of the first aspect.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
the preparation method of the hot corrosion resistant directional superalloy master alloy provided by the embodiment of the application has the following purposes that different slag materials are respectively pretreated: removing moisture in the air absorbed by the slag stored in the environment; by controlling the components of the slag, the purpose is as follows: controlling the optimal desulfurization chemical reaction to realize the optimal desulfurization effect; after refining, adding slag materials with sufficient proportion and mixing, and the purpose is as follows: the desulfurization slag is added into the high-temperature alloy melt which is refined and mixed uniformly and has preliminary purity, so that the full and efficient desulfurization at high temperature is realized; in smelting, after the slag charge is melted down, controlling the temperature of molten steel, and the aim is that: on one hand, the temperature of molten steel is controlled, the desulfurization and the degasification are facilitated, and on the other hand, the proper steel-slag reaction temperature is provided for slag materials, so that the optimal desulfurization effect is achieved; and controls the degassing time, the purpose is that: realize the synergistic promotion of desulfurization and degassing (oxygen, nitrogen, etc.); the tapping temperature is controlled, and the aim is that: a low segregation and high density solidification structure is obtained, and the upward floating removal of impurity elements is promoted. In summary, the sulfur content in the hot corrosion resistant directional superalloy master alloy prepared by the method is controlled below 5ppm, and the hot corrosion resistant directional superalloy master alloy can be applied to manufacturing directional blades in aeroengines and gas turbines, so that the working safety of the blades is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic flow chart of a method for preparing a hot corrosion resistant directional superalloy master alloy according to an embodiment of the present application;
fig. 2 is a schematic diagram of one of vacuum induction melting furnaces used in a method for preparing a hot corrosion resistant directional superalloy master alloy according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Various embodiments of the application may exist in a range of forms; it should be understood that the description in a range format is merely for convenience and brevity and should not be construed as a rigid limitation on the scope of the application; it is therefore to be understood that the range description has specifically disclosed all possible sub-ranges and individual values within that range. For example, it should be considered that a description of a range from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5, and 6, wherever applicable. In addition, whenever a numerical range is referred to herein, it is meant to include any reference number (fractional or integer) within the indicated range.
In the present application, unless otherwise specified, terms such as "upper" and "lower" are used specifically to refer to the orientation of the drawing in the figures. In addition, in the description of the present specification, the terms "include", "comprising" and the like mean "including but not limited to". Relational terms such as "first" and "second", and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Herein, "and/or" describing an association relationship of an association object means that there may be three relationships, for example, a and/or B, may mean: a alone, a and B together, and B alone. Wherein A, B may be singular or plural. Herein, "at least one" means one or more, and "a plurality" means two or more. "at least one", "at least one" or the like refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, "at least one (individual) of a, b, or c," or "at least one (individual) of a, b, and c," may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple, respectively.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present application are commercially available or may be prepared by existing methods.
In a first aspect, the present application provides a method for preparing a hot corrosion resistant directional superalloy master alloy, see fig. 1, comprising:
s1, respectively preprocessing different slag charges to obtain a target slag charge system; wherein the target slag system has a set composition;
in some embodiments, the different slag materials are respectively pretreated to obtain a target slag system; wherein the target slag system has a set composition comprising:
respectively baking different slag materials, and controlling the baking temperature of the different slag materials to obtain a target slag system; wherein the target slag system has a set composition.
In the embodiment of the application, the pretreatment of different slag materials respectively comprises the steps of baking the different slag materials respectively, and has the positive effects that: the water adsorbed by slag materials stored in the environment is removed to the maximum extent, and the entrainment of oxygen, nitrogen and hydrogen to the high-temperature alloy molten steel is reduced.
In some embodiments, the setting component comprises: caO and CaF, wherein the ratio of the CaO to the CaF is 1:1-4.
The target slag system is a desulfurization slag system, and the components of the desulfurization slag system are CaO and CaF, wherein the CaO has the positive effects: chemically reacting with sulfur in molten steel to generate CaS; positive effect of CaF: improves the fluidity of the slag, ensures the full and uniform contact between the slag and molten steel, and ensures the desulfurization effect. The positive effect of controlling the ratio of CaO to CaF to be 1:1-4: not only ensures enough CaO to realize desulfurization sufficiency, but also takes account of the fluidity of slag and the desulfurization efficiency; if the CaO content is too high or the CaF content is too low, the fluidity of slag can be affected to a certain extent, and the dynamic effect of desulfurization is reduced; if the CaO content is too low or the CaF content is too high, the desulfurizing agent is insufficient to a certain extent, and the desulfurizing amplitude is reduced. Specifically, the ratio of CaO to CaF may be 1: 1. 1:2. 1: 3. 1:4, etc.
In some embodiments, the baking temperature of the CaO is 500-800 ℃ and the baking temperature of the CaF is 200-500 ℃.
The positive effect of controlling the baking temperature of CaO to be 500-800℃: the moisture in the slag charge is guaranteed to be fully evaporated and dried, and meanwhile, the contact fusion property with molten steel is improved. If the temperature is too high, the production efficiency of slag charge preparation can be reduced to a certain extent, and the production cost is increased; if the temperature is too low, the CaO dryness is reduced to some extent, and gaseous elements are introduced into the molten steel. Specifically, the baking temperature of CaO may be 500 ℃, 600 ℃, 700 ℃, 800 ℃, or the like. The positive effect of controlling the baking temperature of CaF to be 200-500℃: the moisture in the slag is guaranteed to be fully evaporated and dried. If the temperature is too high, the production efficiency of slag charge preparation can be reduced to a certain extent, and the production cost is increased; if the temperature is too low, the slag charge dryness can be difficult to ensure to a certain extent, the gas content of the molten steel is affected, and the purity of the molten steel is reduced. Specifically, the baking temperature of CaF may be 200 ℃, 300 ℃, 400 ℃, 500 ℃, etc.
S2, melting raw materials, performing first degassing after the raw materials are melted down, and refining to obtain first molten steel;
in some embodiments, the first degassing temperature is 1600 to 1700 ℃, and/or the first degassing time is
≥30min。
In some embodiments, the temperature of the refining is 1500 to 1650 ℃, and/or the time of the refining is 30 to 100 minutes.
In the embodiment of the application, the raw materials comprise Ni, co, W, mo, ta, cr, ti and the like, and a continuous charging mode under vacuum is adopted, so that the hot corrosion resistant directional superalloy master alloy is required to be subjected to vacuum induction smelting, the device can be seen in fig. 2, and the vacuum induction smelting technology can effectively reduce the O, N content in the alloy, and generally has no desulfurization effect. In order to realize desulfurization under the vacuum induction smelting condition, a vacuum slag-making desulfurization technology is adopted, namely, under the vacuum smelting condition, proper desulfurization slag systems are utilized, and a reasonable smelting process is combined to realize desulfurization. The effect of desulfurization depends on the one hand on the desulfurization slag system used and on the other hand is also closely related to the smelting process. Therefore, the design of the desulfurization slag system is consistent with the application, so as to improve the desulfurization effect.
The positive effects of controlling the temperature of the first degassing to 1600-1700 ℃ and/or the time of the first degassing to be more than or equal to 30min are that: and the gas elements released in the raw material melting process and the gas elements in the environment in the furnace body are fully removed. Specifically, the temperature of the first degassing may be 1600 ℃, 1650 ℃, 1700 ℃, and the time of the first degassing may be 30min, 32min, 34min, etc.
Controlling the refining temperature to be 1500-1650 ℃ and/or the refining time to be 30-100 min: the best matching of refining temperature and time is realized, and the molten steel is ensured to have good basic purity. Specifically, the refining temperature may be 1500 ℃, 1550 ℃, 1600 ℃, 1650 ℃, and the refining time may be 30min, 50min, 70min, 100min, etc.
S3, adding the target slag system into the first molten steel to carry out desulfurization until the target slag system is melted down, controlling the temperature of the first molten steel containing the target slag system in a melted down state, and carrying out second degassing to obtain second molten steel;
and in the step S3, the stirring mode of molten steel is continuously matched so as to ensure the maximum contact of a steel-slag interface.
In some embodiments, the temperature of the first molten steel comprising the target slag system in the molten state is 1600-1700 ℃.
After refining, adding slag materials with sufficient proportion and mixing, and has the positive effects: the comprehensive matching of the deep desulfurization capacity and the desulfurization efficiency of the slag is realized by adding the mixed slag with a proper proportion into the molten steel with good basic purity; the positive effect of controlling the temperature of the molten steel containing the target slag system in a molten state to be 1600-1700 ℃ is that: ensuring that the molten steel has good desulfurization and degassing reaction capacity. If the temperature is too high, steel ladle etching is aggravated to a certain extent, and harmful impurities are brought into molten steel; if the temperature is too low, the desulfurization reaction ability of molten steel is lowered to some extent. Specifically, the temperature of the molten steel containing the target slag system in a molten state may be 1600 ℃, 1650 ℃, 1700 ℃, or the like.
In some embodiments, the second degassing time is 30 to 100 minutes.
The positive effect of controlling the second degassing time to be 30-100 min is that: harmful gas elements such as oxygen, nitrogen and the like are fully removed, and the desulfurization reaction is promoted. If the degassing time is too long, ladle etching can be accelerated to a certain extent, and the production cost can be increased; if the degassing time is too short, the gas removal effect and the desulfurization effect are reduced to some extent. Specifically, the second degassing time may be 30min, 50min, 70min, 90min, 100min, etc.
And S4, tapping the second molten steel, controlling the tapping temperature, and then pouring to obtain the hot corrosion resistant directional superalloy master alloy.
In some embodiments, the tapping temperature is 1500-1600 ℃.
The positive effect of controlling the tapping temperature of the second molten steel to be 1500-1600 ℃: obtaining a low segregation and high-density solidification structure. The tapping temperature is too high, so that segregation of alloy elements and impurity elements can be aggravated to a certain extent, and the alloy performance is affected; if the tapping temperature is too low, the castability of molten steel and the smooth progress of the casting process can be affected to a certain extent. Specifically, the tapping temperature may be 1500, 1550 ℃, 1600 ℃, etc. Before tapping, stirring and overturning a crucible and the like are adopted, and the purposes are as follows: promote the floating of gas elements, accelerate the desulfurization reaction and homogenize the molten steel components. After tapping, slag blocking, filtering and other modes are adopted during pouring so as to prevent desulfurization slag from entering a poured ingot mould along with molten steel and ensure the purity of master alloy.
In a second aspect, the present application provides a hot corrosion resistant directional superalloy master alloy prepared by the method of any of the embodiments of the first aspect.
The hot corrosion resistant directional superalloy master alloy typically represents the following components (mass percent): 0.08 to 0.14 percent of C, 13.20 to 14.00 percent of Cr, 8.80 to 9.60 percent of Co, 3.50 to 4.10 percent of W, 0.90 to 1.50 percent of Mo, 3.20 to 3.80 percent of Ta, 2.90 to 3.50 percent of Al and Ti
4.40 to 5.00 percent, 0.010 to 0.018 percent of B, more than or equal to 11.10 percent of Al+Ti+Ta, and the balance of Ni and unavoidable impurity elements.
The hot corrosion resistant directional superalloy master alloy is realized based on the preparation method of the hot corrosion resistant directional superalloy master alloy, and specific steps of the preparation method of the hot corrosion resistant directional superalloy master alloy can refer to the embodiment, and as the hot corrosion resistant directional superalloy master alloy adopts part or all of the technical schemes of the embodiment, at least all beneficial effects brought by the technical schemes of the embodiment are provided, and are not repeated herein.
The application will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. The experimental procedures, which are not specified in the following examples, are generally determined according to national standards. If the corresponding national standard does not exist, the method is carried out according to the general international standard, the conventional condition or the condition recommended by the manufacturer.
Example 1
S1, respectively preprocessing different slag charges to obtain a target slag charge system; wherein the target slag system has a set composition;
the pretreatment comprises baking, wherein the target slag system comprises the following set components: caf=1:1, cao baking temperature is 500 ℃, caF baking temperature is 200 ℃.
S2, melting raw materials, performing first degassing after the raw materials are melted down, and refining to obtain first molten steel;
the first degassing temperature is 1600 ℃, and the first degassing time is 30min. The refining temperature is 1500 ℃, and the refining time is 30min.
S3, adding the target slag system into the first molten steel to carry out desulfurization until the target slag system is melted down, controlling the temperature of the first molten steel containing the target slag system in a melted down state, and carrying out second degassing to obtain second molten steel;
after the target slag system is melted, the temperature of the first molten steel is 1600 ℃, and the second degassing time is 30min.
S4, tapping the second molten steel, controlling the tapping temperature, and then pouring to obtain the hot corrosion resistant directional superalloy master alloy, wherein the tapping temperature is 1500 ℃.
Example 2
S1, respectively preprocessing different slag charges to obtain a target slag charge system; wherein the target slag system has a set composition;
the pretreatment comprises baking, wherein the target slag system comprises the following set components: caf=1:2.5, cao baking temperature 600 ℃, caF baking temperature 300 ℃.
S2, melting raw materials, performing first degassing after the raw materials are melted down, and refining to obtain first molten steel;
the temperature of the first degassing is 1650 ℃, and the time of the first degassing is 40min. The refining temperature is 1600 ℃, and the refining time is 70min.
S3, adding the target slag system into the first molten steel to carry out desulfurization until the target slag system is melted down, controlling the temperature of the first molten steel containing the target slag system in a melted down state, and carrying out second degassing to obtain second molten steel;
after the target slag system is melted down, the temperature of the first molten steel is 1650 ℃ and the second degassing time is 70min.
S4, tapping the second molten steel, controlling the tapping temperature, and then pouring to obtain the hot corrosion resistant directional superalloy master alloy, wherein the tapping temperature is 1550 ℃.
Example 3
S1, respectively preprocessing different slag charges to obtain a target slag charge system; wherein the target slag system has a set composition;
the pretreatment comprises baking, wherein the target slag system comprises the following set components: caf=1:4, cao baking temperature is 800 ℃, caF baking temperature is 500 ℃.
S2, melting raw materials, performing first degassing after the raw materials are melted down, and refining to obtain first molten steel;
the first degassing temperature is 1700 ℃, and the first degassing time is 50min. The refining temperature is 1650 ℃ and the refining time is 100min.
S3, adding the target slag system into the first molten steel to carry out desulfurization until the target slag system is melted down, controlling the temperature of the first molten steel containing the target slag system in a melted down state, and carrying out second degassing to obtain second molten steel;
after the target slag system is melted, the temperature of the first molten steel is 1700 ℃, and the second degassing time is 100min.
S4, tapping the second molten steel, controlling the tapping temperature, and then pouring to obtain the hot corrosion resistant directional superalloy master alloy, wherein the tapping temperature is 1600 ℃.
Comparative example 1
S1, respectively preprocessing different slag charges to obtain a target slag charge system; wherein the target slag system has a set composition;
the pretreatment comprises baking, wherein the target slag system comprises the following set components: caf=1:4, cao baking temperature is 450 ℃, caF baking temperature is 150 ℃.
S2, melting raw materials, performing first degassing after the raw materials are melted down, and refining to obtain first molten steel;
the first degassing temperature is 1580deg.C, and the first degassing time is 50min. The refining temperature is 1500 ℃, and the refining time is 80min.
S3, adding the target slag system into the first molten steel to carry out desulfurization until the target slag system is melted down, controlling the temperature of the first molten steel containing the target slag system in a melted down state, and carrying out second degassing to obtain second molten steel;
after the target slag system is melted down, the temperature of the first molten steel is 1580 ℃ and the second degassing time is 100min.
S4, tapping the second molten steel, controlling the tapping temperature, and then pouring to obtain the hot corrosion resistant directional superalloy master alloy, wherein the tapping temperature is 1550 ℃.
TABLE 1 Sulfur content in hot corrosion resistant oriented superalloy master alloy
| Sequence number | Sulfur content (ppm) in hot corrosion resistant directional superalloy master alloy |
| Example 1 | 2 |
| Example 2 | 1 |
| Example 3 | 3 |
| Comparative example 1 | 12 |
As can be seen from Table 1, the sulfur content in the hot corrosion resistant directional superalloy master alloy prepared by the method of the embodiment of the application is controlled below 5ppm, and the hot corrosion resistant directional superalloy master alloy can be applied to manufacturing directional blades in aeroengines and gas turbines, so that the working safety of the blades is improved. The master alloy prepared in the comparative example, which did not employ the method of the example of the present application, was higher in sulfur content.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for preparing a hot corrosion resistant directional superalloy master alloy, comprising:
respectively preprocessing different slag materials to obtain a target slag system; wherein the target slag system has a set composition;
melting raw materials, performing first degassing after the raw materials are melted down, and refining to obtain first molten steel;
adding the target slag system into the first molten steel to carry out desulfurization until the target slag system is melted down, controlling the temperature of the first molten steel containing the target slag system in a melted down state, and carrying out second degassing to obtain second molten steel;
tapping the second molten steel, controlling the tapping temperature, and then pouring to obtain the hot corrosion resistant directional superalloy master alloy.
2. The method according to claim 1, wherein the different slag materials are respectively pretreated to obtain a target slag system; wherein the target slag system has a set composition comprising:
respectively baking different slag materials, and controlling the baking temperature of the different slag materials to obtain a target slag system; wherein the target slag system has a set composition.
3. The method according to claim 1 or 2, wherein the setting component comprises: caO and CaF, wherein the ratio of the CaO to the CaF is 1:1-4.
4. A method according to claim 3, wherein the baking temperature of CaO is 500-800 ℃ and the baking temperature of CaF is 200-500 ℃.
5. The method of claim 1, wherein the temperature of the first molten steel comprising the target slag system in a molten state is 1600-1700 ℃.
6. The method of claim 1, wherein the second degassing time is 30 to 100 minutes.
7. The method according to claim 1, characterized in that the tapping temperature is 1500-1600 ℃.
8. The method of claim 1, wherein the first degassing temperature is 1600-1700 ℃, and or the first degassing time is not less than 30min.
9. The method according to claim 1, wherein the temperature of the refining is 1500-1650 ℃, and or the time of the refining is 30-100 min.
10. A hot corrosion resistant directional superalloy master alloy prepared by the method of any of claims 1 to 9.
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