CN116790940B - Nickel-based alloy for nuclear shielding and manufacturing method thereof - Google Patents
Nickel-based alloy for nuclear shielding and manufacturing method thereof Download PDFInfo
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- CN116790940B CN116790940B CN202311093622.9A CN202311093622A CN116790940B CN 116790940 B CN116790940 B CN 116790940B CN 202311093622 A CN202311093622 A CN 202311093622A CN 116790940 B CN116790940 B CN 116790940B
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- 239000000956 alloy Substances 0.000 title claims abstract description 99
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 98
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 16
- 238000005242 forging Methods 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 10
- 239000013078 crystal Substances 0.000 claims description 10
- 239000011159 matrix material Substances 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 9
- 238000005098 hot rolling Methods 0.000 claims description 8
- 238000002844 melting Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 229910052688 Gadolinium Inorganic materials 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 6
- 230000006698 induction Effects 0.000 claims description 6
- 239000000155 melt Substances 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 238000005097 cold rolling Methods 0.000 claims description 5
- 230000032683 aging Effects 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 238000005728 strengthening Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000003723 Smelting Methods 0.000 description 8
- 239000006104 solid solution Substances 0.000 description 6
- 238000000137 annealing Methods 0.000 description 5
- 229910000712 Boron steel Inorganic materials 0.000 description 4
- 229910000990 Ni alloy Inorganic materials 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 229910000765 intermetallic Inorganic materials 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000009864 tensile test Methods 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002901 radioactive waste Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002915 spent fuel radioactive waste 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
- 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
- C22C19/058—Alloys based on nickel or cobalt based on nickel with chromium without Mo and W
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
-
- 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
- C22C1/023—Alloys based on nickel
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F1/00—Shielding characterised by the composition of the materials
- G21F1/02—Selection of uniform shielding materials
- G21F1/08—Metals; Alloys; Cermets, i.e. sintered mixtures of ceramics and metals
- G21F1/085—Heavy metals or alloys
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The nickel-based alloy for nuclear shielding comprises the following components in parts by weight: c is less than or equal to 0.03 percent, cr:14% -17%, gd:0.5% -5%, fe:5% -10%, al:0.5% -5%, and the balance of Ni and unavoidable impurities. The Gd element in the alloy can effectively play a neutron shielding effect, and meanwhile, gd and Al elements can respectively form a strengthening phase, so that the room temperature and high temperature mechanical properties of the alloy are effectively improved. The invention also provides a manufacturing method of the nickel-based alloy for nuclear shielding.
Description
Technical Field
The invention belongs to the field of nuclear power, and particularly relates to a nickel-based alloy for nuclear shielding and a manufacturing method thereof.
Background
With the rapid development of commercial nuclear power technology, nuclear power is becoming an important component in modern energy systems. With the continuous development of nuclear power plant construction, concerns about the operation of a nuclear power plant reactor and the safety of radioactive waste disposal are growing, and safe and reliable nuclear shielding materials are becoming urgent demands of civil nuclear industry. The nuclear shielding material is required to have good tolerance and shielding capability to neutron radiation, and also needs to have higher room temperature/high temperature mechanical properties. As boron steel has better neutron absorption capacity, corrosion resistance and high strength, the prior art often adopts boron steel for spent fuel shielding and other application scenes. However, the solubility of boron in stainless steel is low, and excessive boron can be precipitated in the form of boride, so that the comprehensive performance of the boron steel is damaged, and the application and development of the boron steel are restricted. The gadolinium element has a larger equivalent seed absorption cross section, has good thermal stability and neutron radiation tolerance, is not easy to corrode and swell, and has good application prospect. However, gadolinium does not form a solid solution in the matrix in stainless steel, but forms intermetallic compounds (Ni, cr, fe) having a melting point of only about 1060 ℃ 3 Gd can cause significant deterioration of mechanical properties, hot workability and weldability of the material. Therefore, the nuclear shielding alloy with good mechanical properties has high practical value for improving the operation safety of the nuclear power station.
Disclosure of Invention
The invention aims to provide a nickel-based alloy for nuclear shielding with high mechanical property. The invention also provides a manufacturing method of the nickel-based alloy for nuclear shielding.
According to an embodiment of one aspect of the present invention, there is provided a nickel-based alloy for nuclear shielding, comprising, in weight ratio: c is less than or equal to 0.03 percent, cr:14% -17%, gd:0.5% -5%, fe:5% -10%, al:0.5% -5%, and the balance of Ni and unavoidable impurities. The structure of the nickel-based alloy for nuclear shielding comprises Ni crystal grains with face-centered cubic structure, (Ni, cr, fe) 5 Gd and Ni 3 Al, wherein the Ni crystal grain of the face-centered cubic structure is an alloy matrix, (Ni, cr, fe) 5 Gd is distributed in the grain boundary of Ni crystal grains of the face-centered cubic structure, ni 3 Al is dispersed in the matrix.
The Cr element can enable the alloy finished product to have good corrosion resistance and strength; the addition amount of Gd element should be controlled so as to not only provide sufficient neutron shielding performance, but also not cause mechanical property loss due to continuous Gd-rich phase precipitation along grain boundary; al can form a dispersion strengthening phase with Ni element, so that the mechanical property of the whole alloy is improved; the Fe element participates in the solid solution of the Ni alloy matrix, but excessive Fe element can be converted into a ferrite structure when Gd and Ni form a precipitated phase, so that the alloy performance is affected.
Further, in some embodiments, the unavoidable impurities include, by weight, N.ltoreq.0.05%, S.ltoreq.0.03%, P.ltoreq.0.03%, and O.ltoreq.0.03%. Gd is easy to combine with impurity elements such as S, P, O to form grain boundary inclusions, and the alloy performance is adversely affected.
Further, in some embodiments, the alloy comprises the following components in weight ratio: c:0.002% -0.03%, cr:14% -15%, gd:0.5% -3.5%, fe:5% -10%, al:0.5% -3.5%, and the balance of Ni and unavoidable impurities.
Further, in some embodiments, the Ni grains of the face-centered cubic structure have an average grain diameter of 5 μm to 50 μm.
Further, in some embodiments, the core-shielding nickel-base alloy has a tensile strength of 700MPa to 900MPa and an elongation of 20% to 40% at room temperature.
According to an embodiment of another aspect of the present invention, there is provided a method for manufacturing a nickel-base alloy for nuclear shielding, which is used for manufacturing the nickel-base alloy for nuclear shielding in any of the foregoing embodiments, comprising the steps of: providing an as-cast alloy, wherein the as-cast alloy is smelted according to the nickel-based alloy composition ratio for nuclear shielding in any embodiment; carrying out hot forging on the as-cast alloy at 1100-1200 ℃ to obtain a forging material; heating the forging material to 1100-1200 ℃ for hot rolling to obtain a hot rolled piece; cold rolling the hot rolled piece, and controlling the total deformation of the cold rolling to be not less than 70% to obtain a cold rolled piece; and heating the cold rolled piece to 1100-1200 ℃, preserving heat for 20-40 min, cooling to 650-750 ℃ by water, preserving heat for 4-6 h, and performing aging treatment to obtain the finished alloy.
By utilizing the method, the Gd-rich precipitated phase in the alloy can be crushed into particles from a continuous net shape, nickel-based alloy crystals are recrystallized in the annealing heating process, and the particle-shaped Gd-rich precipitates keep particle morphology and are dispersed in grain boundaries, so that the overall strength of the alloy is effectively improved; by making a reasonable heat treatment system, the high-melting point (Ni, cr, fe) of the Gd precipitation phase is controlled 5 Gd form, avoiding low melting point (Ni, cr, fe) 3 Gd generation while producing dispersed Ni in the alloy matrix 3 The Al phase further improves the overall performance of the alloy, so that the nickel-based alloy has good mechanical properties at room temperature and high temperature.
Further, in some embodiments, the as-cast alloy is prepared by a melting step: the alloy raw materials are proportionally put into a vacuum induction furnace to be heated to be melted, the temperature of the melt is controlled to 1700-1900 ℃ to be melted for 5-7 min, and casting is carried out after heat preservation for at least 1min, thus obtaining the cast alloy.
Further, in some embodiments, in the hot forging step, the as-cast alloy is held at 1100 ℃ to 1200 ℃ for 1h to 2h.
Further, in some embodiments, in the hot rolling step, the forging is heat-preserved at 1100 ℃ to 1200 ℃ for at least 1 hour and then rolled.
Drawings
FIG. 1 is a photograph of a metallographic structure of a nickel-base alloy for nuclear shielding in one embodiment.
The above drawings are provided for the purpose of explaining the present invention in detail so that those skilled in the art can understand the technical concept of the present invention, and are not intended to limit the present invention.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings by means of specific examples.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment herein. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments limited to the same embodiment. Those skilled in the art will appreciate that embodiments herein may be combined with other embodiments without structural conflict. In the description herein, the meaning of "plurality" is at least two.
According to an embodiment of one aspect of the present invention, a nickel-based alloy for nuclear shielding is provided. The alloy comprises the following components in percentage by weight: c is less than or equal to 0.03 percent, cr:14% -17%, gd:0.5% -5%, fe:5% -10%, al:0.5% -5%, and the balance of Ni and unavoidable impurities.
Wherein, ni is used as a matrix element of the alloy, forms a solid-solution austenitic structure with Fe (refers to a generalized Ni alloy structure with a face-centered cubic structure), and the content of Fe element is limited in a range which can form a certain solid-solution strengthening effect in Ni by solid solution and can not form ferrite locally when Gd, ni and Cr form intermetallic compounds to be precipitated; cr element provides good corrosion resistance and strength for the alloy; the equivalent absorption cross section of Gd element neutrons reaches 46000 targets, and the Gd element neutron absorber is used for providing sufficient neutron shielding performance for the alloy, and meanwhile, the total amount of Gd element is controlled to avoid continuous formation of intermetallic compounds formed by Gd element on grain boundaries, so that the mechanical performance is reduced; al element and Ni element form dispersed Ni 3 Al phase to further enhance the overall properties of the alloy.
In a preferred embodiment, the impurity elements in the alloy should satisfy the following control conditions: n is less than or equal to 0.05 percent, S is less than or equal to 0.03 percent, P is less than or equal to 0.03 percent, and O is less than or equal to 0.03 percent. Gd element is easily combined with impurity elements to form grain boundary inclusions, which adversely affect alloy properties, and therefore strict control of impurity element content is required.
In a further preferred embodiment, the alloying element components comprise, by weight: c:0.002% -0.03%, cr:14% -15%, gd:0.5% -3.5%, fe:5% -10%, al:0.5% -3.5%, and the balance of Ni and unavoidable impurities.
In the preferred embodiment, the metallographic structure of the nickel-base alloy is shown in FIG. 1, and comprises Ni (containing partial Fe element solid solution) crystal grains 1 with granular (Ni, cr, fe) grain boundaries distributed 5 Gd precipitate phase 2, fine Ni 3 Al particles 3 are dispersed and uniformly distributed in the alloy matrix, so that the alloy has a strengthening effect. In a further preferred embodiment, the Ni alloy grains 1 have an average diameter of 5 μm to 50 μm, and in the embodiment shown in FIG. 1 about 20 μm.
In a preferred embodiment, the nickel-based alloy is subjected to mechanical property test at normal temperature, has tensile strength of 700-900 MPa and elongation of 20-40%, and shows excellent comprehensive performance.
An embodiment of another aspect of the present invention provides the method for manufacturing a nickel-base alloy for nuclear shielding in the above embodiment, comprising the steps of: providing an as-cast alloy; carrying out hot forging on the as-cast alloy at 1100-1200 ℃ to obtain a forging material; heating the forging material to 1100-1200 ℃ for hot rolling to obtain a hot rolled plate; cold rolling the hot-rolled sheet to 20% of the initial thickness to obtain a cold-rolled sheet; heating the cold-rolled sheet to 1100-1200 ℃, preserving heat for 30min, cooling to 650-750 ℃ by water, preserving heat for 4-6 h, and performing aging treatment to obtain the finished alloy. In other embodiments, the nickel-base alloy may also be processed into bars, tubes or other shaped alloy materials by a corresponding processing method.
In a preferred embodiment, the as-cast alloy is prepared by smelting: the alloy raw materials are proportionally put into a vacuum induction furnace to be heated to be melted, the temperature of the melt is controlled between 1700 ℃ and 1900 ℃ to be melted for 5min to 7min, and casting is carried out after heat preservation for 1min, thus obtaining the cast alloy.
In a further preferred embodiment, the as-cast alloy is first incubated at 1100-1200 ℃ for 1-2 hours prior to hot forging. Before hot rolling, the alloy forging is first heat preserved at 1100-1200 deg.c for 1 hr.
A preferred embodiment of the invention implements the method as follows:
first, according to weight percentage C:0.02%, cr:15.0%, fe 5%, al 1.5%, gd:2.5%, ni: the balance is prepared into raw materials, the impurity component N is controlled to be less than or equal to 0.05 percent, S is controlled to be less than or equal to 0.03 percent, P is controlled to be less than or equal to 0.03 percent, and O is controlled to be less than or equal to 0.03 percent. And (3) putting the raw materials into a vacuum induction furnace for smelting, heating the melt to 1800 ℃ for smelting for 5min, preserving heat for 1min, and then casting and forming to obtain the as-cast alloy.
Then, the as-cast alloy is heated to 1180+/-20 ℃, the temperature is kept for 1h, a hot forging machine is utilized to forge the as-cast alloy into a cuboid, and the as-cast alloy is cooled to obtain a forged material.
And next, heating the forging material to 1150+/-20 ℃, preserving heat for 1h, and carrying out hot rolling to obtain a hot rolled plate with the thickness of 5 mm.
Next, the hot-rolled sheet was cold-rolled into a cold-rolled sheet having a thickness of 1 mm.
Subsequently, the cold rolled sheet is heat treated: and heating the cold-rolled sheet to 1150+/-20 ℃ for 20min for annealing, cooling to 650 ℃ by water, then preserving heat for 6h, and cooling to room temperature by air to obtain the finished nickel-based alloy sheet for nuclear shielding.
Three standard tensile samples are cut on the finished alloy for room temperature tensile test, and the yield strength is measured to be more than 400MPa, the tensile strength is 700-750 MPa, and the elongation is 30-40%.
Another preferred embodiment implementation of the invention is as follows:
firstly, the following weight percentages are: c:0.02%, cr:17.0%, fe 10%, al 2.5%, gd:3%, ni: the balance is prepared into raw materials, the impurity component N is controlled to be less than or equal to 0.05 percent, S is controlled to be less than or equal to 0.03 percent, P is controlled to be less than or equal to 0.03 percent, and O is controlled to be less than or equal to 0.03 percent. And (3) putting the raw materials into a vacuum induction furnace for smelting, heating the melt to 1900 ℃ for smelting for 7min, preserving heat for 1min, and then casting and forming to obtain the as-cast alloy.
And then heating the as-cast alloy to 1150+/-20 ℃, preserving heat for 2 hours, forging into a cuboid by using a hot forging machine, and cooling to obtain the forging material.
Next, the forged material was heated to 1130.+ -. 20 ℃ and kept at the temperature for 1 hour, and hot-rolled to obtain a hot-rolled sheet having a thickness of 5 mm.
Next, the hot-rolled sheet was cold-rolled into a cold-rolled sheet having a thickness of 1 mm.
Subsequently, the cold rolled sheet is heat treated: and heating the cold-rolled sheet to 1150+/-20 ℃ for 40min for annealing, cooling to 750 ℃ by water, then preserving heat for 4h, and cooling to room temperature by air to obtain the finished nickel-based alloy sheet for nuclear shielding.
Three standard tensile samples are cut on the finished alloy for room temperature tensile test, and the yield strength is measured to be more than 400MPa, the tensile strength is 780-810 MPa, and the elongation is 30-35%.
A further preferred embodiment implementation of the invention is as follows:
firstly, the following weight percentages are: c:0.02%, cr:15.0%, fe 5%, al 3.5%, gd:2%, ni: the balance is prepared into raw materials, the impurity component N is controlled to be less than or equal to 0.05 percent, S is controlled to be less than or equal to 0.03 percent, P is controlled to be less than or equal to 0.03 percent, and O is controlled to be less than or equal to 0.03 percent. And (3) putting the raw materials into a vacuum induction furnace for smelting, heating the melt to 1900 ℃ for smelting for 6min, preserving heat for 1min, and then casting and forming to obtain the as-cast alloy.
Then, the as-cast alloy is heated to 1180+/-20 ℃ and kept for 2 hours, and is forged into a cuboid by a hot forging machine, and is cooled to obtain the forging material.
And next, heating the forging material to 1150+/-20 ℃, preserving heat for 1h, and carrying out hot rolling to obtain a hot rolled plate with the thickness of 5 mm.
Next, the hot-rolled sheet was cold-rolled into a cold-rolled sheet having a thickness of 1 mm.
Subsequently, the cold rolled sheet is heat treated: and heating the cold-rolled sheet to 1150+/-DEG C for 30min for annealing, cooling to 700 ℃ by water, then preserving heat for 5h, and cooling to room temperature by air to obtain the finished nickel-based alloy sheet for nuclear shielding.
Three standard tensile samples are cut on the finished alloy for room temperature tensile test, and the yield strength is measured to be more than 400MPa, the tensile strength is 700-720 MPa, and the elongation is 36-40%.
The nickel-based alloy for nuclear shielding provided in the above embodiment is prepared by adding a nickel-based alloy to the element composition and the processing parametersThe number is controlled to lead the Gd element to form a close-packed hexagonal structure (Ni, cr, fe) with higher melting point 5 Gd, avoidance of low melting point (Ni, cr, fe) 3 Gd appears; net shape (Ni, cr, fe) formed in smelting process by rolling 5 Gd is broken and uniformly distributed on a grain boundary again after annealing to form a strengthening phase, so that Gd element plays a role in neutron shielding and improves the room temperature and high temperature mechanical properties of the alloy; the Al element and the Ni element are combined to form Ni with uniform dispersion 3 The Al phase further enhances the mechanical properties of the alloy.
The above-described embodiments are intended to explain the present invention in further detail with reference to the figures so that those skilled in the art can understand the technical concept of the present invention. Within the scope of the invention, the components or method steps involved are optimized or replaced equivalently, and the implementation manners of the different embodiments are combined on the premise that no conflict between the structure and the principle exists, which falls within the protection scope of the invention.
Claims (9)
1. The nickel-based alloy for nuclear shielding is characterized by comprising the following components in parts by weight:
c is less than or equal to 0.03 percent, cr:14% -17%, gd:0.5% -5%, fe:5% -10%, al:0.5% -5%, and the balance of Ni and unavoidable impurities;
the nickel-based alloy for nuclear shielding is heated to 1100-1200 ℃, kept for 20-40 min and cooled to 650-750 ℃ by water, and the tissue obtained after aging treatment is carried out for 4-6 h after heat preservation comprises Ni crystal grains (Ni, cr and Fe) with a face-centered cubic structure 5 Gd and Ni 3 Al, wherein the Ni crystal grain of the face-centered cubic structure is an alloy matrix, (Ni, cr, fe) 5 Gd is distributed in the grain boundary of Ni crystal grains of the face-centered cubic structure, ni 3 Al is dispersed in the matrix.
2. The nickel-base alloy for nuclear shielding according to claim 1, wherein among the unavoidable impurities, N is 0.05% or less, S is 0.03% or less, P is 0.03% or less, and O is 0.03% or less, by weight.
3. The nickel-base alloy for nuclear shielding according to claim 1 or 2, comprising the following components in weight ratio: c:0.002% -0.03%, cr:14% -15%, gd:0.5% -3.5%, fe:5% -10%, al:0.5% -3.5%, and the balance of Ni and unavoidable impurities.
4. The nickel-base alloy for nuclear shielding according to claim 1 or 2, wherein the Ni crystal grain of the face-centered cubic structure has an average crystal grain diameter of 5 μm to 50 μm.
5. The nickel-base alloy for nuclear shielding according to claim 1 or 2, wherein the nickel-base alloy for nuclear shielding has a tensile strength of 700MPa to 900MPa and an elongation of 20% to 40% at room temperature.
6. A method for manufacturing a nickel-base alloy for nuclear shielding according to any one of claims 1 to 5, comprising the steps of:
providing an as-cast alloy, wherein the as-cast alloy is smelted according to the nickel-based alloy composition proportion for nuclear shielding as set forth in any one of claims 1 to 5;
carrying out hot forging on the as-cast alloy at 1100-1200 ℃ to obtain a forging material;
heating the forging material to 1100-1200 ℃ for hot rolling to obtain a hot rolled piece;
cold rolling the hot rolled piece, and controlling the total deformation of the cold rolling to be not less than 70% to obtain a cold rolled piece;
and heating the cold rolled piece to 1100-1200 ℃, preserving heat for 20-40 min, cooling to 650-750 ℃ by water, preserving heat for 4-6 h, and performing aging treatment to obtain the finished alloy.
7. The method of manufacturing a nickel-base alloy for nuclear shielding according to claim 6, wherein the as-cast alloy is prepared by a melting step of: the alloy raw materials are proportionally put into a vacuum induction furnace to be heated to be melted, the temperature of the melt is controlled to 1700-1900 ℃ to be melted for 5-7 min, and casting is carried out after heat preservation for at least 1min, thus obtaining the cast alloy.
8. The method for producing a nickel-base alloy for nuclear shielding according to claim 6 or 7, wherein in the hot forging step, the as-cast alloy is kept at 1100 ℃ to 1200 ℃ for 1h to 2h.
9. The method for producing a nickel-base alloy for nuclear shielding according to claim 6 or 7, wherein in the hot rolling step, the forged material is heat-preserved at 1100 ℃ to 1200 ℃ for at least 1 hour and then rolled.
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|---|---|---|---|---|
| JPS57110987A (en) * | 1980-12-27 | 1982-07-10 | Tokyo Shibaura Electric Co | Neutron absorber |
| CA1183613A (en) * | 1980-12-27 | 1985-03-05 | Koichiro Inomata | Neutron absorber, neutron absorber assembly utilizing the same, and other uses thereof |
| US6730180B1 (en) * | 2000-09-26 | 2004-05-04 | Bechtel Bwxt Idaho, Llc | Neutron absorbing alloys |
| JP2020026544A (en) * | 2018-08-09 | 2020-02-20 | 日本製鉄株式会社 | Ni-BASED ALLOY MATERIAL AND PRODUCT OF NUCLEAR POWER USE |
| CN110273085A (en) * | 2019-04-15 | 2019-09-24 | 上海大学 | Reactor spentnuclear fuel storing rich gadolinium nickel-bass alloy material and preparation method thereof |
| CN116288047A (en) * | 2023-02-13 | 2023-06-23 | 上海大学 | Gadolinium-enriched iron-nickel base alloy material with excellent hot workability for nuclear shielding and preparation method thereof |
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| CN116790940A (en) | 2023-09-22 |
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