CN113249619B - Matrix component design method of delta-phase reinforced nickel-based superalloy - Google Patents
Matrix component design method of delta-phase reinforced nickel-based superalloy Download PDFInfo
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- 239000011159 matrix material Substances 0.000 title claims abstract description 70
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 34
- 229910000601 superalloy Inorganic materials 0.000 title claims abstract description 31
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 26
- 238000013461 design Methods 0.000 title abstract description 7
- 239000000956 alloy Substances 0.000 claims abstract description 100
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 99
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 29
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 28
- 239000000203 mixture Substances 0.000 claims abstract description 17
- 230000003647 oxidation Effects 0.000 claims abstract description 7
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 7
- 238000001556 precipitation Methods 0.000 claims abstract description 7
- 238000010587 phase diagram Methods 0.000 claims abstract description 5
- 238000009792 diffusion process Methods 0.000 claims description 19
- 229910052750 molybdenum Inorganic materials 0.000 claims description 19
- 239000007787 solid Substances 0.000 claims description 19
- 229910052721 tungsten Inorganic materials 0.000 claims description 19
- 229910052804 chromium Inorganic materials 0.000 claims description 16
- 238000010586 diagram Methods 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000003750 conditioning effect Effects 0.000 claims 1
- 238000005728 strengthening Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 8
- 238000001513 hot isostatic pressing Methods 0.000 description 10
- 239000000843 powder Substances 0.000 description 10
- 230000008569 process Effects 0.000 description 7
- 230000004913 activation Effects 0.000 description 5
- 238000004090 dissolution Methods 0.000 description 5
- 238000001878 scanning electron micrograph Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910003310 Ni-Al Inorganic materials 0.000 description 2
- 229910018559 Ni—Nb Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 238000005275 alloying Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 229910052702 rhenium Inorganic materials 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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- 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
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/053—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 30% but less than 40%
-
- 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
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
-
- 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
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Abstract
The application provides a matrix composition design method of a delta-phase strengthened nickel-based superalloy. The design method of the matrix component of the delta-phase reinforced nickel-based superalloy comprises the following steps: determining a pre-adjustment element X in the components of the basic alloy, and determining the dosage of the pre-adjustment element X according to the influence of the pre-adjustment element X on the precipitation and oxidation resistance of a TCP phase; calculating the maximum solubility of Nb and/or Al in the base alloy according to the binary phase diagram, and determining the use amount of Nb and/or Al according to the maximum solubility; and adjusting the components of the base alloy according to the use amount of Nb and/or Al and the use amount of the pre-adjustment element X to obtain the alloy matrix. The alloy matrix designed by the method can reduce the solubility of Nb and Al in the delta phase in the alloy matrix to the maximum extent, so that the strengthening effect of the delta phase is improved.
Description
Technical Field
The application relates to the field of alloys, in particular to a method for designing a matrix component of a delta-phase strengthened nickel-based high-temperature alloy.
Background
At present, the nickel-based high-temperature alloy is widely applied to hot end materials of aero-engines such as turbine disks, and with the development of the aero-engines towards high thrust-weight ratio and high reliability, higher requirements are put forward on the temperature bearing capacity of the nickel-based high-temperature alloy. The new-type delta-phase strengthened nickel-base high-temp alloy is made up by using Nb3Relatively low Al density, high melting point, good chemical stability, high temperature yield strength and Nb3Al can form good metallurgical bonding with gamma-matrix, and Nb3Al is added as a strengthening phase to the nickel-base superalloy. The strengthening phase in the alloy has high stability and can be effectively combined with a matrix.
Nb is used in HIP forming process of novel delta-phase reinforced nickel-base high-temperature alloy3Nb and Al elements in Al have certain solubility in a gamma matrix and are gradually dissolved into the matrix to cause the strengthening effect to be reduced, so that the dissolution of delta phase in the HIP forming process needs to be reduced to improve Nb3The thermal stability of Al in the process ensures the strengthening effect.
Therefore, how to reduce the dissolution of the delta phase in the alloy matrix to ensure the strengthening effect of the delta phase becomes a problem to be solved urgently.
Disclosure of Invention
The present application is directed to providing an alloy matrix, a method of designing the same, and a delta-phase strengthened nickel-base superalloy, which solve the above problems.
In order to achieve the purpose, the following technical scheme is adopted in the application:
a method for designing the matrix composition of a delta-phase strengthened nickel-base superalloy comprises the following steps:
determining a pre-adjustment element X in the components of the basic alloy, and determining the dosage of the pre-adjustment element X according to the influence of the pre-adjustment element X on the precipitation and oxidation resistance of a TCP (transmission control protocol) phase;
calculating the maximum solubility of Nb and/or Al in the base alloy according to a binary phase diagram, and determining the use amount of Nb and/or Al according to the maximum solubility;
and adjusting the components of the base alloy according to the use amount of Nb and/or Al and the use amount of the pre-adjustment element X to obtain the matrix component of the delta-phase reinforced nickel-base superalloy.
Preferably, the base alloy comprises, in mass percent, 40-60% Ni, 8-20% Cr, 10-20% Co, 3-10% W and 3-10% Mo.
Preferably, the "determining the pre-adjustment element X in the composition of the base alloy" includes: determining an element Y which has high solid solubility in Ni and is immiscible with Nb and Al in the components of the base alloy, and removing elements capable of improving the diffusion rate of delta phase elements in the base alloy from the element Y, thereby determining the pre-adjustment element X.
Preferably, the "element Y determining the composition of the base alloy which has a large solid solubility in Ni and is immiscible with Nb and Al" includes:
according to the Houm-Rosehry solid solubility rule, an element Y which has high solid solubility in Ni and is immiscible with Nb and Al is found out on an electronegativity-atomic radius diagram.
Preferably, the pre-adjustment element X comprises Cr.
Preferably, the element Y includes Cr, Co, Mo and W.
Preferably, the maximum solubility of Nb is 8% and the maximum solubility of Al is 3.37%.
Preferably, the temperature corresponding to the maximum solubility is the highest temperature at which the delta phase strengthened nickel-base superalloy is prepared using the alloy matrix.
Preferably, the matrix composition of the delta-phase strengthened nickel-base superalloy comprises the following components in percentage by mass: 15% -30% of Cr, 10% -20% of Co, 3% -10% of W, 3% -10% of Mo, 0-8% of Nb, 0-4% of Al and 35% -65% of Ni;
wherein Nb and Al cannot be 0 at the same time.
Compared with the prior art, the beneficial effect of this application includes:
the method for designing the matrix components of the delta-phase reinforced nickel-based high-temperature alloy determines a pre-adjustment element X and the using amount thereof on the basis of chemical components limited by a basic alloy from the viewpoint of reducing the solubility of Nb and Al in an alloy matrix, then calculates the maximum solubility of Nb and/or Al in a gamma-matrix according to a binary phase diagram, and adjusts the element content in the gamma-matrix according to the maximum solubility to obtain the components of the alloy matrix; the alloy matrix designed by the method can reduce the solubility of Nb and Al in the delta phase in the alloy matrix to the maximum extent; the alloy matrix obtained by the matrix component design method of the delta-phase reinforced nickel-based high-temperature alloy limits the use amounts of Cr, Co, W, Mo, Nb, Al and Ni through the selection and optimization of the components, thereby reducing the solubility of Nb and Al in the delta-phase in the alloy matrix in the HIP (hot isostatic pressing) forming process, improving the thermal stability of the delta-phase in the HIP (hot isostatic pressing) forming process, and ensuring that the delta-phase can well play a reinforcing role in the high-temperature alloy;
the alloy matrix obtained by the method for designing the matrix components of the delta-phase reinforced nickel-base superalloy is used for preparing the delta-phase reinforced nickel-base superalloy, so that the delta-phase content is high and the stability is obviously enhanced; the alloy has strong temperature bearing capacity, high hardness and high yield strength.
Drawings
To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments are briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope of the present application.
FIG. 1 is a schematic illustration of a method of designing an alloy matrix provided in example 1;
FIG. 2 is an SEM image of the nickel-base superalloy obtained in example 1;
FIG. 3 is an SEM image of the nickel-base superalloy obtained in example 2;
FIG. 4 is an SEM image of the nickel-base superalloy obtained in example 3;
FIG. 5 is an SEM image of the nickel-base superalloy obtained in comparative example 1.
Detailed Description
The terms as used herein:
"prepared from … …" is synonymous with "comprising". The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
The conjunction "consisting of … …" excludes any unspecified elements, steps or components. If used in a claim, the phrase is intended to claim as closed, meaning that it does not contain materials other than those described, except for the conventional impurities associated therewith. When the phrase "consisting of … …" appears in a clause of the subject matter of the claims rather than immediately after the subject matter, it defines only the elements described in the clause; other elements are not excluded from the claims as a whole.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when the range "1 ~ 5" is disclosed, the ranges described should be construed to include the ranges "1 ~ 4", "1 ~ 3", "1 ~ 2 and 4 ~ 5", "1 ~ 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
In these examples, the parts and percentages are by mass unless otherwise indicated.
"part by mass" means a basic unit of measure indicating a mass ratio of a plurality of components, and 1 part may represent any unit mass, for example, 1g or 2.689 g. If we say that the part by mass of the component A is a part by mass and the part by mass of the component B is B part by mass, the ratio of the part by mass of the component A to the part by mass of the component B is a: b. alternatively, the mass of the A component is aK and the mass of the B component is bK (K is an arbitrary number, and represents a multiple factor). It is unmistakable that, unlike the parts by mass, the sum of the parts by mass of all the components is not limited to 100 parts.
"and/or" is used to indicate that one or both of the illustrated conditions may occur, e.g., a and/or B includes (a and B) and (a or B).
A method for designing the matrix composition of a delta-phase strengthened nickel-base superalloy comprises the following steps:
determining a pre-adjustment element X in the components of the basic alloy, and determining the dosage of the pre-adjustment element X according to the influence of the pre-adjustment element X on the precipitation and oxidation resistance of a TCP (transmission control protocol) phase;
calculating the maximum solubility of Nb and/or Al in the base alloy according to a binary phase diagram, and determining the use amount of Nb and/or Al according to the maximum solubility;
and adjusting the components of the base alloy according to the use amount of Nb and/or Al and the use amount of the pre-adjustment element X to obtain the matrix component of the delta-phase reinforced nickel-base superalloy.
The synergistic effect of elements in a superalloy affects the diffusion activation energy of the elements and thus the diffusion rate of the elements. Except for Co, Al, Ti, Nb, Ta, Cr, Co, Mo, W, Re and Ru in the high-temperature alloy can improve the diffusion activation energy of other alloy elements and reduce the diffusion coefficient. The reason is that on one hand, a complex local adjacent environment is formed among alloying elements, so that the probability of occurrence of vacancies is reduced, and on the other hand, the strong chemical bonding effect among X-Y atom pairs can block atom hopping and increase the diffusion barrier of atoms in gamma-Ni.
Preferably, the base alloy comprises, in mass percent, 40-60% Ni, 8-20% Cr, 10-20% Co, 3-10% W and 3-10% Mo.
Alternatively, the base alloy may have Ni content of 40%, 50%, 60% and 40-60%, Cr content of 8%, 10%, 15%, 20% and 8-20%, Co content of 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20% and 10-20%, W content of 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10% and 3-10%, and Mo content of 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10% and 3-10%.
Preferably, the "determining the pre-adjustment element X in the composition of the base alloy" includes: determining an element Y which has high solid solubility in Ni and is immiscible with Nb and Al in the components of the base alloy, and removing elements capable of improving the diffusion rate of delta phase elements in the base alloy from the element Y, thereby determining the pre-adjustment element X.
Finding out elements which have higher solid solubility in Ni and are insoluble with Nb and Al as much as possible, and then removing elements capable of improving the diffusion rate of the elements Nb and Al in the delta phase in a matrix from the consideration of the influence of the element synergistic effect on the diffusion rate of the elements in the alloy to obtain a pre-adjustment element X.
Preferably, the "element Y determining the composition of the base alloy which has a large solid solubility in Ni and is immiscible with Nb and Al" includes:
according to the Houm-Rosehry solid solubility rule, an element Y which has high solid solubility in Ni and is immiscible with Nb and Al is found out on an electronegativity-atomic radius diagram.
The principle of the Hume-Rosehry solid solubility rule: the solid solubility in solid solutions is influenced by size factors and electronegative factors, and it is generally considered that it is difficult to form a solid solution having a high solubility in metals when the atomic radius exceeds 15%. In addition, the element has a large solubility when the electronegativity is within 0.4. Therefore, an element with a larger solid solubility with a certain element can be judged according to the atomic radius-electronegativity diagram.
Preferably, the pre-adjustment element X comprises Cr.
Preferably, the element Y includes Cr, Co, Mo and W.
Preferably, the maximum solubility of Nb is 8% and the maximum solubility of Al is 3.37%.
Preferably, the temperature corresponding to the maximum solubility is the highest temperature at which the delta phase strengthened nickel-base superalloy is prepared using the alloy matrix.
The dosage of Nb and/or Al is determined according to the maximum solubility corresponding to the temperature, and is directly consistent with the temperature in high-temperature alloy processing, so that the optimal component formula of the alloy matrix can be obtained.
Preferably, the matrix composition of the delta-phase strengthened nickel-base superalloy comprises the following components in percentage by mass: 15% -30% of Cr, 10% -20% of Co, 3% -10% of W, 3% -10% of Mo, 0-8% of Nb, 0-4% of Al and 35% -65% of Ni;
wherein Nb and Al cannot be 0 at the same time.
Optionally, the content of Cr in the alloy matrix may be any value between 15%, 20%, 25%, 30% and 15% -30% by mass; the content of Co may be any value between 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20% and 10% -20%; the content of W may be any value between 10%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10% and 3% -10%; the content of Mo may be any value between 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10% and 3% -10%; the content of Nb may be any value between 0, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, and 0-8%; the content of Al may be any value between 0, 1%, 2%, 3%, 4%, 5%, and 0-4%; the Ni content may be any value between 35%, 40%, 45%, 50%, 55%, 60%, 65% and 35% -65%.
Embodiments of the present application will be described in detail below with reference to specific examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present application and should not be construed as limiting the scope of the present application. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1
As shown in fig. 1, the present embodiment provides a method for designing an alloy matrix, which includes the following steps:
the alloy matrix composition (base alloy) of the present δ -phase strengthening alloy is 64.1% Ni, 10.1% Cr, 14.6% Co, 6.1% W, 5.1% Mo.
First, the elements Cr, Co, Mo and W (element Y) which have high solid solubility in Ni and are not substantially in solid solution with Nb are found from a Houm-Rostheri electronegativity-atomic radius diagram.
Secondly, considering that Mo and W have higher density and are not suitable for being added too much in the high-temperature alloy, and Co can reduce the diffusion activation energy of other alloy elements, particularly Nb and Al, and improve the diffusion coefficient, so that the stability of the delta phase is not facilitated; thus, the pre-adjustment element is determined to be Cr (element X). According to the influence of Cr on TCP phase precipitation and oxidation resistance and the effect of reducing the diffusion rate of Nb and Al in a matrix to further improve the stability of a delta phase, the use amount of Cr is determined to be increased to 20.1 percent.
The solubility of Nb in the γ -matrix (base alloy) at 1100 c was 8% calculated from Ni-Nb. Thus the addition of 8% Nb to the alloy matrix ensures that theoretically the Nb in the matrix is saturated and thus avoids the dissolution of the delta phase.
The adjusted matrix alloy comprises 46.1% of Ni, 20.1% of Cr, 14.6% of Co, 6.1% of W, 5.1% of Mo and 8% of Nb.
Adding Nb into the adjusted alloy matrix powder3Al powder (50% by volume, in other embodiments, can be added in a range of more than 0 and 70% or less) is subjected to hot isostatic pressing at 1100 ℃ and 1200MPa to obtain the delta-phase reinforced nickel-base superalloy, the delta-phase accounts for 15.63% by volume of the nickel-base superalloy after forming, the temperature bearing capacity reaches 870 ℃, the room-temperature hardness is 617HV, and the room-temperature yield strength is 1427 MPa.
The SEM of the resulting delta-phase strengthened nickel-base superalloy is shown in FIG. 2.
Example 2
The embodiment provides a design method of an alloy matrix, which comprises the following specific steps:
the alloy matrix composition (base alloy) of the present δ -phase strengthening alloy is 64.1% Ni, 10.1% Cr, 14.6% Co, 6.1% W, 5.1% Mo.
Firstly, according to a hum-Rhotherium electronegativity-atomic radius diagram, the elements which have higher solid solubility in Ni and are not mutually and basically dissolved with Nb are Cr, Co, Mo and W.
Secondly, considering that Mo and W have higher density and are not suitable for being added too much in the high-temperature alloy, and Co can reduce the diffusion activation energy of other alloy elements, particularly Nb and Al, and improve the diffusion coefficient, so that the stability of the delta phase is not facilitated; the pre-adjustment element is thus determined to be Cr. According to the influence of Cr on TCP phase precipitation and oxidation resistance and the effect of reducing the diffusion rate of Nb and Al in a matrix to further improve the stability of a delta phase, the use amount of Cr is determined to be increased to 20.1 percent.
The solubility of Al in the gamma-matrix (base alloy) at 1100 c was 3.37% calculated from Ni-Al. Thus the addition of 4% Al to the alloy matrix ensures that theoretically the Al in the matrix is saturated and thus avoids dissolution of the delta phase.
The adjusted matrix alloy comprises 50.1% of Ni, 20.1% of Cr, 14.6% of Co, 6.1% of W, 5.1% of Mo and 4% of Al.
Adding Nb into the adjusted alloy matrix powder3And carrying out hot isostatic pressing treatment on Al powder (volume fraction is 50%) at 1100 ℃ and 1200MPa to obtain the delta-phase reinforced nickel-based high-temperature alloy, wherein the volume fraction of the delta-phase in the formed nickel-based high-temperature alloy is 13.88%, the temperature bearing capacity reaches 865 ℃, the room-temperature hardness is 611HV, and the room-temperature yield strength is 1401 MPa.
The SEM image of the resulting delta-phase strengthened nickel-base superalloy is shown in FIG. 3.
Example 3
The embodiment provides a design method of an alloy matrix, which comprises the following specific steps:
the alloy matrix composition (base alloy) of the present δ -phase strengthening alloy is 64.1% Ni, 10.1% Cr, 14.6% Co, 6.1% W, 5.1% Mo.
Firstly, according to a hum-Rhotherium electronegativity-atomic radius diagram, the elements which have higher solid solubility in Ni and are not mutually and basically dissolved with Nb are Cr, Co, Mo and W.
Secondly, considering that Mo and W have higher density and are not suitable for being added too much in the high-temperature alloy, and Co can reduce the diffusion activation energy of other alloy elements, particularly Nb and Al, and improve the diffusion coefficient, so that the stability of the delta phase is not facilitated; the pre-adjustment element is thus determined to be Cr. According to the influence of Cr on TCP phase precipitation and oxidation resistance and the effect of reducing the diffusion rate of Nb and Al in a matrix to further improve the stability of a delta phase, the use amount of Cr is determined to be increased to 20.1 percent.
The solubility of Nb in the γ -matrix at 1100 c was 8% calculated from Ni-Nb and the solubility of Al in the γ -matrix (base alloy) at 1100 c was 3.37% calculated from Ni-Al. Thus the addition of 6% Nb +2% Al to the alloy matrix ensures that theoretically the Al in the matrix is saturated and thus avoids dissolution of the delta phase.
The adjusted matrix alloy comprises 46.1% of Ni, 20.1% of Cr, 14.6% of Co, 6.1% of W, 5.1% of Mo, 6% of Nb and 2% of Al.
Adding Nb into the adjusted alloy matrix powder3Al powder (volume fraction is 50 percent) is subjected to hot isostatic pressing forming treatment under the conditions of 1100 ℃ and 1200MPa to obtain the delta-phase reinforced nickel-based high-temperature alloy, the volume fraction of the delta-phase in the nickel-based high-temperature alloy after forming is 14.51 percent, the temperature bearing capacity reaches 860 ℃, the room-temperature hardness is 596HV, and the room-temperature yield strength is 1392 MPa.
The SEM of the resulting delta phase strengthened nickel base superalloy is shown in FIG. 4.
Comparative example 1
The matrix components of the novel delta-phase reinforced nickel-based high-temperature alloy are 64.1 percent of Ni, 10.1 percent of Cr, 14.6 percent of Co, 6.1 percent of W and 5.1 percent of Mo. Strengthening phase Nb3The volume fraction of the Al powder was 50%. And uniformly mixing the matrix alloy powder and the delta phase powder, and forming by using a hot isostatic pressing method to obtain the delta phase reinforced nickel-based high-temperature alloy.
The volume fraction of delta phase after molding is 9.85%, the temperature bearing capacity reaches 850 ℃, the room temperature hardness is 563HV, and the room temperature yield strength is 1366 Mpa.
The SEM of the resulting delta phase strengthened nickel base superalloy is shown in FIG. 5.
As can be seen by comparing FIGS. 2, 3, 4 and 5, the advantages are obtainedAlloyed matrix with Nb3The delta phase strengthened nickel-base high-temperature alloy prepared from the Al powder has higher delta phase content and is more stable.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Moreover, those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims above, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Claims (7)
1. A method for designing the matrix composition of a delta-phase strengthened nickel-based superalloy is characterized by comprising the following steps:
determining a pre-adjustment element X in the components of the basic alloy, and determining the dosage of the pre-adjustment element X according to the influence of the pre-adjustment element X on the precipitation and oxidation resistance of a TCP (transmission control protocol) phase; the determining of the pre-adjustment element X in the composition of the base alloy comprises: determining an element Y which has high solid solubility in Ni and is immiscible with Nb and Al in the components of the base alloy, and removing elements capable of improving the diffusion rate of delta phase elements in the base alloy from the element Y, thereby determining the pre-adjustment element X; the element Y which is determined to have high solid solubility in Ni and is immiscible with Nb and Al in the components of the base alloy comprises: according to the hum-Rosehry solid solubility rule, an element Y which has high solid solubility in Ni and is immiscible with Nb and Al is found out on an electronegativity-atomic radius diagram;
calculating the maximum solubility of Nb and/or Al in the base alloy according to a binary phase diagram, and determining the use amount of Nb and/or Al according to the maximum solubility;
and adjusting the components of the base alloy according to the use amount of Nb and/or Al and the use amount of the pre-adjustment element X to obtain the matrix component of the delta-phase reinforced nickel-base superalloy.
2. The method as claimed in claim 1, wherein the base alloy comprises, in mass%, 40-60% Ni, 8-20% Cr, 10-20% Co, 3-10% W, and 3-10% Mo.
3. The method as set forth in claim 1, wherein the pre-conditioning element X comprises Cr.
4. The method as set forth in claim 1, wherein the element Y comprises Cr, Co, Mo and W.
5. The method of claim 1, wherein the maximum solubility of Nb is 8% and the maximum solubility of Al is 3.37%.
6. The method of claim 5, wherein the temperature corresponding to the maximum solubility is the highest temperature at which the delta phase strengthened nickel-base superalloy is prepared using the alloy matrix.
7. The method as claimed in any one of claims 1 to 6, wherein the matrix composition of the delta-phase strengthened nickel-base superalloy comprises, in mass percent: 15% -30% of Cr, 10% -20% of Co, 3% -10% of W, 3% -10% of Mo, 0-8% of Nb, 0-4% of Al and 35% -65% of Ni;
wherein Nb and Al cannot be 0 at the same time.
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