CN115852230B - ZrC reinforced FeCrAl alloy and preparation method thereof - Google Patents
ZrC reinforced FeCrAl alloy and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a ZrC reinforced FeCrAl alloy and a preparation method thereof, comprising the following steps: ball milling the ZrC nano powder and the FeCrAl alloy powder at a low temperature below zero to obtain mixed powder of the ZrC and the FeCrAl alloy powder; performing high-energy ball milling on the mixed powder under the protection of inert atmosphere to obtain ZrC and FeCrAl alloyed powder; preparing ZrC nano particle reinforced FeCrAl blank from the alloying powder in a hot isostatic pressing mode; and rolling and forming the blank by controlling the direction, so as to obtain the ZrC reinforced FeCrAl alloy. According to the invention, through a two-step ball milling method, low-temperature ball milling powder is subjected to uniform refinement treatment, then high-energy ball milling powder is alloyed, and a Hot Isostatic Pressing (HIP) process and a controlled direction-adjusting rolling process are combined, so that ZrC reinforcing phases are uniformly dispersed, and the ZrC reinforcing FeCrAl alloy material with high strength and high thermal stability is prepared.
Description
Technical Field
The invention relates to the technical field of nuclear material preparation, in particular to a ZrC reinforced FeCrAl alloy and a preparation method thereof, and more particularly relates to a ZrC nanoparticle reinforced FeCrAl alloy with high strength and high thermal stability and a preparation method thereof.
Background
The zirconium-based alloy for the nuclear power light water reactor has good corrosion resistance and low thermal neutron absorption cross section, and plays an important role in modern light water reactors. However, in the event of a loss of water accident, the cladding material eventually fails to produce a serious accident. For example, a Japanese Foundation Nuclear Power station leak accident. Accident-resistant fuels have therefore become an important issue in recent years. Compared with zirconium-based alloy, the ferrite stainless steel formed by adding proper Cr and Al has good mechanical property, and the oxidation kinetics is obviously reduced in a high-temperature steam environment. Thus, feCrAl alloys have a higher accident resistance and can be used in place of zirconium-based alloys for Light Water Reactor (LWR) fuel cladding.
The FeCrAl matrix is added with a small amount of Mo, nb and other elements, thus having good solid solution strengthening effect in the matrix and forming Fe with good high-temperature stability 2 (Mo, nb) Laves phase. The Laves phases have high melting point and good stability, and can be dispersed in a matrix to form nucleation sites, refine crystal grains and prevent movement of crystal boundaries and dislocation, so that a matrix structure is stabilized at a high temperature. But Fe is 2 The (Mo, nb) Laves phase has small volume fraction and can lead to Fe under the high-temperature environment of 1000-1200 DEG C 2 Mo、Fe 2 Nb coarsens and gradually dissolves back into the matrix, weakening the pinning effect on the material.
The carbide has higher melting point, such as ZrC (3540 ℃), tiC (3160 ℃) and the like, can stably exist in a high-temperature environment, and is usually selected as a dispersion strengthening phase to refine matrix grains and improve the mechanical property and high-temperature property of the material. As the thermal neutron absorption section of Zr is only 0.184 bar, the hardness of ZrC is high, the melting point is as high as 3540 ℃, and the thermal neutron absorption section is far higher than TiC, and the thermal neutron absorption section has good high-temperature stability. Therefore, zrC is selected as a dispersion strengthening phase to prepare the ZrC reinforced FeCrAl alloy, and the performance of the FeCrAl alloy is expected to be further improved.
The ZrC nano particles serving as the reinforcing phase are very small in size and have higher surface energy, the nano particles are mutually attracted and gathered together to reduce free energy, so that ZrC is unevenly dispersed, and the dispersion strengthening effect is obviously reduced, so that the ZrC can be uniformly dispersed in a matrix, can be effectively alloyed with the matrix, and the dispersion strengthening effect of the ZrC is ensured to be fully exerted.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the ZrC nano particles serving as a reinforcing phase are very small in size and have higher surface energy, the nano particles are mutually attracted and gathered together to reduce free energy, so that ZrC is unevenly dispersed, and the dispersion strengthening effect is remarkably reduced.
The invention is realized by the following technical scheme:
a preparation method of a ZrC reinforced FeCrAl alloy comprises the following steps: ball milling the ZrC nano powder and the FeCrAl alloy powder at a low temperature below zero to obtain mixed powder of the ZrC and the FeCrAl alloy powder; performing high-energy ball milling on the mixed powder under the protection of inert atmosphere to obtain ZrC and FeCrAl alloyed powder; preparing ZrC nano particle reinforced FeCrAl blank from the alloying powder in a hot isostatic pressing mode; and rolling and forming the blank by controlling the direction, so as to obtain the ZrC reinforced FeCrAl alloy.
According to the invention, by adopting a uniform alloying method of two-step ball milling of low-temperature ball milling and high-energy ball milling, the ZrC nano phase and FeCrAl alloy powder are fully refined and alloyed, zrC is uniformly dispersed, and thus sintered high-activity mixed powder is obtained; in the subsequent HIP sintering forming and controlled direction-regulating hot rolling process, zrC dissolved in the FeCrAl matrix is dispersed and separated in a finer form, so that the mechanical property and high-temperature stability of the FeCrAl are effectively improved. Therefore, the innovation of the invention is mainly that the nano ZrC reinforced alloy powder with high sintering activity is obtained by a two-step ball milling method, and the ZrC reinforced FeCrAl alloy with high strength and high thermal stability is obtained by controlling the direction-regulating hot rolling plastic deformation mode, thereby realizing the preparation of FeCrAl materials with engineering value.
The FeCrAl alloy preferably comprises (8.5-12)% Cr, (3.2-5.2)% Al and (1.0-1.5)% Mo, (0.5-0.8)% Si, (0.2-0.5)% Ti, wherein the purity is 99.9%, the S, P, C, N, O content is less than 0.01%, and the balance is Fe, and the mass percentages are all; the use amount of ZrC is (2.0-4.0)% of the total mass of the FeCrAl alloy. In addition, inert atmosphere, such as high purity argon, is used for high energy ball milling.
Further alternatively, the FeCrAl alloy powder has a particle size of 80-150 μm; and/or the particle size of the ZrC nano powder is 100 nm-150 nm.
Further alternatively, the low-temperature ball milling temperature is-30 ℃ to-15 ℃. The low-temperature environment can be manufactured by adopting a liquid nitrogen cooling mode, and the low-temperature ball milling is carried out.
Further optionally, the low temperature ball milling design parameters include: the working vacuum degree is 100 Pa-120 Pa, and/or the ball-material ratio is 10:1-12:1, and/or the rotating speed is 350 r/min-400 r/min, and/or the ball milling time is 10 h-12 h.
Further alternatively, a dispersing agent is added during the high energy ball milling process. The dispersant includes, for example, ethanol, such as ethanol added with a mass fraction of 8% as a dispersant.
Further alternatively, the high energy ball milling parameter design includes: the ball-material ratio is 8:1-10:1, and/or the rotating speed is 180 r/min-250 r/min, and/or the ball milling time is 20-30h.
Further optionally, the hot isostatic pressing parameter design comprises: the temperature is 1000-1050 ℃, and/or the applied pressure is 100-150 MPa, and/or the dwell time is 25-35 min.
Further alternatively, in the hot rolling process, the hot rolling temperature is 1080-1200 ℃, the hot rolling termination temperature is 920-980 ℃, and the rolling quantity is 70-85%.
Further alternatively, in the hot rolling process, the controlling the turning rolling includes the steps of: firstly, hot rolling is carried out along the widening direction, and the total deformation is 20% -30%; thereafter, rolling is performed in the longitudinal direction. If the blank is firstly hot rolled along the stretching direction of the blank, the total deformation is 20% -30%, then the rolling direction of the plate is changed by 90 degrees, and the plate is rolled along the length direction until reaching the final dimension and is annealed by stress relief.
The ZrC reinforced FeCrAl alloy is prepared by adopting the preparation method of the ZrC reinforced FeCrAl alloy.
The ZrC nanoparticle reinforced FeCrAl alloy material provided by the invention is prepared from ZrC nano powder and FeCrAl powder serving as raw materials by uniformly refining the ZrC nano powder through low-temperature ball milling, performing high-energy ball milling alloying, combining Hot Isostatic Pressing (HIP) blank forming, and performing controlled blank steering hot rolling to obtain a high-strength plate. The ZrC nanoparticle reinforced FeCrAl alloy prepared by the method has excellent mechanical strength and high-temperature stability. The example results show that compared with FeCrAl without ZrC, the ZrC nano particle reinforced FeCrAl prepared by the method provided by the invention has obviously improved tensile strength and thermal stability.
The invention has the following advantages and beneficial effects:
1. the preparation method of the ZrC reinforced FeCrAl alloy provided by the invention can effectively realize uniform dispersion of the reinforcing phase ZrC in the matrix and alloying with the matrix.
2. The room-temperature tensile strength of the ZrC reinforced FeCrAl alloy prepared by the invention can reach 1196.1MPa, and the elongation is 10.8%. In addition, after high-temperature annealing at 1000 ℃ for 24 hours, the maximum change rate of the hardness of the material is only 2.2 percent, and the material has obvious thermal stability.
3. The preparation method of the ZrC reinforced FeCrAl alloy provided by the invention has the characteristics of high efficiency and good repeatability, and is suitable for industrial production and preparation.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention. In the drawings:
FIG. 1 is a graph showing the engineering stress-engineering strain contrast of ZrC reinforced FeCrAl alloys prepared in examples 1-3 of the present invention at room temperature; in the figure, A represents the curve of the ZrC reinforced FeCrAl alloy prepared in example 1, B represents the curve of the ZrC reinforced FeCrAl alloy prepared in example 2, and C represents the curve of the ZrC reinforced FeCrAl alloy prepared in example 3.
FIG. 2 is a graph of sample dimensions for a tensile test of a panel according to the present invention.
FIG. 3 is a graph showing the characterization of the uniform dispersion of the ZrC reinforced phase of the present invention.
FIG. 4 is a statistical result of the grain size of the ZrC reinforced FeCrAl alloy.
FIG. 5 is a microstructure of ZrC reinforced FeCrAl alloy grains.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: no such specific details are necessary to practice the invention. In other instances, well-known structures, materials, or methods have not been described in detail in order to avoid obscuring the present invention.
Example 1
The embodiment provides a preparation method of a ZrC reinforced FeCrAl alloy, which comprises the following steps:
step 1, preparing ZrC nano powder and FeCrAl micro powder:
the ZrC nano powder content is 2.0%, the average particle size is 100nm, the rest is FeCrAl powder, and the average particle size of the micron powder is 100 mu m.
Step 2, ball milling at low temperature:
mixing ZrC nano powder and FeCrAl micron powder, placing the mixture into a ball milling tank, vacuumizing to 100Pa, introducing liquid nitrogen, controlling the temperature to-30 ℃, taking stainless steel balls as ball milling media, wherein the ball-material ratio is 10:1, the rotating speed is 350r/min, and the grinding time is 10h, so as to obtain the uniformly dispersed mixed powder.
Step 3, high-energy ball milling:
and (3) putting the uniformly dispersed mixed powder prepared in the step (2) into a high-energy ball milling tank, protecting by using high-purity argon, and performing ball milling for 20 hours in a mode of forward rotation for 10min, cooling for 5min and reverse rotation for 10min, wherein a stainless steel ball is used as a ball milling medium, the ball-material ratio is 8:1, and the rotating speed is 250r/min, so as to obtain the mechanical alloying powder.
Step 4, adopting HIP blank forming:
preparing a blank from the mechanical alloying powder by Hot Isostatic Pressing (HIP), wherein the sintering temperature is 1050 ℃, the heat preservation is carried out for 35min, and the sintering pressure is 100MPa, so as to prepare a ZrC reinforced FeCrAl alloy sintered blank;
step 5, hot rolling of the blank:
heating the ZrC reinforced FeCrAl alloy sintered blank to 1200 ℃, and preserving heat for 35min; firstly, hot rolling is started along the widening direction, the deformation amount is 20%, then the billet is adjusted to be 90 degrees, the billet is rolled along the length direction, the total deformation amount of the rolling is 75%, and the final rolling temperature is 920 ℃.
The hardness of the material after stress relief annealing is measured to be 330.8HV; after aging at 1000 ℃ for 24 hours, the hardness of the material is 325.5HV, and the hardness value is changed by 1.6% compared with that before annealing.
Step 6, annealing:
the annealing process of the hot rolled sample is as follows: the annealing temperature is 400 ℃ and the annealing time is 2h. The room temperature tensile strength of the annealed material is 1090.6MPa, and the elongation is 19.1%.
Example 2
The embodiment provides a preparation method of a ZrC reinforced FeCrAl alloy, which comprises the following steps:
step 1, preparing ZrC nano powder and FeCrAl micro powder:
the ZrC nano powder content is 3.0%, the average particle size is 100nm, the rest is FeCrAl powder, and the average particle size of the micron powder is 150 mu m.
Step 2, ball milling at low temperature:
mixing ZrC nano powder and FeCrAl micron powder, placing the mixture into a ball milling tank, vacuumizing to 100Pa, introducing liquid nitrogen, controlling the temperature to-30 ℃, taking stainless steel balls as ball milling media, wherein the ball-material ratio is 10:1, the rotating speed is 400r/min, and the grinding time is 12 hours, so that the uniformly dispersed mixed powder is obtained.
Step 3, high-energy ball milling:
and (3) putting the uniformly dispersed mixed powder prepared in the step (2) into a high-energy ball milling tank, protecting by using high-purity argon, and performing ball milling for 30 hours in a mode of forward rotation for 10min, cooling for 5min and reverse rotation for 10min, wherein a stainless steel ball is used as a ball milling medium, the ball-material ratio is 10:1, and the rotating speed is 200r/min, so as to obtain the mechanical alloying powder.
Step 4, adopting HIP blank forming:
preparing a blank from the mechanical alloying powder by Hot Isostatic Pressing (HIP), wherein the sintering temperature is 1000 ℃, the heat preservation is carried out for 35min, and the sintering pressure is 120MPa, so as to prepare the ZrC reinforced FeCrAl alloy sintering blank.
Step 5, hot rolling of the blank:
heating the ZrC reinforced FeCrAl alloy sintered blank to 1200 ℃, preserving heat for 20min, firstly starting hot rolling along the widening direction, wherein the deformation amount is 25%, then adjusting the blank to 90 degrees, rolling along the length direction, wherein the total rolling deformation amount is 70%, and the final rolling temperature is 980 ℃.
The hardness of the material after stress relief annealing is measured to be 340.6HV; after aging at 1000 ℃ for 24 hours, the hardness of the material is 337.1HV, and the hardness value is changed by 1.0% compared with that before annealing.
Step 6, annealing:
the annealing process of the hot rolled sample is as follows: the annealing temperature is 450 ℃, and the annealing time is 1.5h. The room temperature tensile strength of the annealed material is 1130.8MPa, and the elongation is 16.9%.
Example 3
The embodiment provides a preparation method of a ZrC reinforced FeCrAl alloy, which comprises the following steps:
step 1, preparing ZrC nano powder and FeCrAl micro powder:
the ZrC nano powder content is 4.0%, the average particle size is 150nm, the rest is FeCrAl powder, and the average particle size of the micron powder is 100 mu m.
Step 2, ball milling at low temperature:
mixing ZrC nano powder and FeCrAl micron powder, placing the mixture into a ball milling tank, vacuumizing to 120Pa, introducing liquid nitrogen, controlling the temperature to-15 ℃, taking stainless steel balls as ball milling media, wherein the ball-material ratio is 12:1, the rotating speed is 400r/min, and the grinding time is 12h, so as to obtain the uniformly dispersed mixed powder.
Step 3, high-energy ball milling:
and (3) putting the uniformly dispersed mixed powder prepared in the step (2) into a high-energy ball milling tank, protecting by using high-purity argon, and performing ball milling for 30 hours in a mode of forward rotation for 10min, cooling for 5min and reverse rotation for 10min, wherein a stainless steel ball is used as a ball milling medium, the ball-material ratio is 10:1, and the rotating speed is 250r/min, so as to obtain the mechanical alloying powder.
Step 4, adopting HIP blank forming:
preparing a blank from the mechanical alloying powder by Hot Isostatic Pressing (HIP), wherein the sintering temperature is 1000 ℃, the heat preservation is carried out for 35min, and the sintering pressure is 120MPa, so as to prepare the ZrC reinforced FeCrAl alloy sintering blank.
Step 5, hot rolling of the blank:
heating the ZrC reinforced FeCrAl alloy sintered blank to 1080 ℃, preserving heat for 30min, firstly starting hot rolling along the widening direction, wherein the deformation amount is 30%, then adjusting the blank to 90 degrees, rolling along the length direction, wherein the total rolling deformation amount is 85%, and the final rolling temperature is 980 ℃.
The hardness of the material after stress relief annealing is 346.7HV; after aging at 1000 ℃ for 24 hours, the hardness of the material is 340.2HV, and the hardness value is changed by 1.9% compared with that before annealing.
Step 6, annealing:
the annealing process of the hot rolled sample is as follows: the annealing temperature is 450 ℃, and the annealing time is 1.5h. The room temperature tensile strength of the annealed material is 1196.1MPa, and the elongation is 10.8%.
Example 4
The embodiment provides a preparation method of a ZrC reinforced FeCrAl alloy, which comprises the following steps:
step 1, preparing ZrC nano powder and FeCrAl micro powder:
the ZrC nano powder content is 2.0%, the average particle size is 150nm, the rest is FeCrAl powder, and the average particle size of the micron powder is 150 mu m.
Step 2, ball milling at low temperature:
mixing ZrC nano powder and FeCrAl micron powder, placing the mixture into a ball milling tank, vacuumizing to 120Pa, introducing liquid nitrogen, controlling the temperature to-20 ℃, taking stainless steel balls as ball milling media, wherein the ball-material ratio is 10:1, the rotating speed is 400r/min, and the grinding time is 12h, so as to obtain the uniformly dispersed mixed powder.
Step 3, high-energy ball milling:
and (3) putting the uniformly dispersed mixed powder prepared in the step (2) into a high-energy ball milling tank, protecting by using high-purity argon, and performing ball milling for 20 hours in a mode of forward rotation for 10min, cooling for 5min and reverse rotation for 10min, wherein a stainless steel ball is used as a ball milling medium, the ball-material ratio is 8:1, and the rotating speed is 200r/min, so as to obtain the mechanical alloying powder.
Step 4, adopting HIP blank forming:
preparing a blank from the mechanical alloying powder by Hot Isostatic Pressing (HIP), wherein the sintering temperature is 1050 ℃, the heat preservation is carried out for 25min, and the sintering pressure is 150MPa, so as to prepare the ZrC reinforced FeCrAl alloy sintered blank.
Step 5, hot rolling of the blank:
heating the ZrC reinforced FeCrAl alloy sintered blank to 1080 ℃, preserving heat for 20min, firstly starting hot rolling along the widening direction, wherein the deformation amount is 25%, then adjusting the blank to 90 degrees, rolling along the length direction, wherein the total rolling deformation amount is 80%, and the final rolling temperature is 960 ℃.
The hardness of the material after stress relief annealing is 320.6HV; after aging at 1000 ℃ for 24 hours, the hardness of the material is 327.5HV, and the hardness value is changed by 2.2% compared with that before annealing.
Step 6, annealing:
the annealing process of the hot rolled sample is as follows: the annealing temperature is 450 ℃, and the annealing time is 1h. The room temperature tensile strength of the annealed material is 1053.7MPa, and the elongation is 18.6%.
Comparative example 1
The ZrC reinforced FeCrAl alloy provided in this comparative example was prepared by the method of example 1, except that: only adopting a low-temperature ball milling one-step ball milling method, wherein the ball milling time is 30 hours.
Comparative example 2
The ZrC reinforced FeCrAl alloy provided in this comparative example was prepared by the method of example 1, except that: only a high-energy ball milling one-step ball milling method is adopted, and the ball milling time is 30 hours.
Comparative example 3
The ZrC reinforced FeCrAl alloy provided in this comparative example was prepared by the method of example 1, except that: the average particle size of the ZrC nano powder is 100nm, and the average particle size of the FeCrAl micro powder is 100 mu m.
Comparative example 4
The ZrC reinforced FeCrAl alloy provided in this comparative example was prepared by the method of example 1, except that: when hot rolling and forming, the total deformation is 75 percent.
The performance test method comprises the following steps:
1. room temperature tensile strength: the sample size for the tensile test of the plate is shown in FIG. 2, and the strain rate is 10 -3 ~10 -5 s -1 .
2. Elongation after break at room temperature: the broken parts of the room temperature tensile sample are carefully matched together, the axes of the broken parts are on the same straight line, special measures are taken to ensure that the broken parts of the sample are properly contacted, then the resolution is used for measuring the broken gauge length due to the measuring tool of 0.1mm, the difference value between the broken gauge length and the pre-broken gauge length is calculated, and the percentage of the difference value and the pre-broken gauge length is the room temperature elongation after breaking.
3. Vickers hardness: the Vickers hardness test of the plate refers to the test method of the part 1 of the Vickers hardness test of the GB/T4340.1 metal material.
Performance test results: from the test results of the examples: as can be seen from the accompanying drawings 1 and the table 1, the tensile strength of the ZrC reinforced FeCrAl alloy with high strength and high thermal stability is higher than 1000MPa. The room temperature tensile strength of the application examples 1-4 are 1090.6MPa, 1130.8MPa, 1196.1MPa and 11053.7MPa respectively, which are obviously higher than those of the comparison examples 1-4; and the elongation of examples 1 and 4 is also better than that of comparative examples 1 to 4. Examples 1-4 showed that the hardness values before and after aging for 24 hours at 1000 ℃ were 1.6%, 1.0%, 1.9% and 2.2%, respectively, indicating that the thermal aging had less influence on the hardness of the rolled material and that the material had good thermal stability.
Table 1 mechanical Property test results of comparative examples 1 to 4 and examples 1 to 4 rolled ZrC reinforced FeCrAl sheets
In conclusion, the nano ZrC particle reinforced FeCrAl material provided by the invention has excellent high-temperature stability and strength, and can be prepared into a blank through powder metallurgy two-step ball milling method treatment and hot isostatic pressing, and then is obtained through a mode of controlling and adjusting the direction for hot rolling forming.
Regarding dispersibility: the ZrC nano-particles reinforced FeCrAl material prepared by the method has the advantages that the ZrC is uniformly distributed in the FeCrAl substrate, and the ZrC reinforcing phase is uniformly dispersed as shown in figure 3.
The low-temperature ball milling is mainly characterized in that the crushing process is mainly performed at low temperature, so that mixed particles are further rapidly ground, crushed and uniformly mixed, and meanwhile, the solid solubility of mutually non-diffusible phases is improved, so that the strength and the hardness of the material are enhanced, and the thermal stability of the material is improved.
High-energy ball milling: homogenizing the particle size distribution of the mixed particles by high-energy ball milling, and promoting the mutual diffusion of powder elements to form a new stable state; the reaction activation energy is reduced, the powder activity is enhanced, the Gao Shaojie capability is improved, and the subsequent powder sintering and forming are increased.
As shown in the example 4, the microstructure and grain size distribution of the finally prepared material sample grains are shown in the figure 4 and the figure 5, the grains in the rolled plate are equiaxed ferrite structures with the average grain size of about 0.8 mu m, a large number of dispersed nano ZrC particle reinforced phases are uniformly distributed in the grains, and the microstructure characteristics improve the mechanical strength of the material.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (7)
1. The preparation method of the ZrC reinforced FeCrAl alloy is characterized by comprising the following steps of:
ball-milling ZrC nano powder and FeCrAl alloy powder at a low temperature below zero to obtain mixed powder of ZrC and FeCrAl alloy powder, wherein the low-temperature ball-milling temperature is-30 ℃ to-15 ℃, and the mass percentages of the components of the FeCrAl alloy are as follows: cr (8.5-12), al (3.2-5.2), mo (1.0-1.5), si (0.5-0.8), ti (0.2-0.5), S, P, C, N, O less than 0.01%, and the balance of Fe, wherein the ZrC is (2.0-4.0) of the total mass of the FeCrAl alloy;
performing high-energy ball milling on the mixed powder under the protection of inert atmosphere to obtain ZrC and FeCrAl alloyed powder;
preparing ZrC nano particle reinforced FeCrAl blank from the alloying powder in a hot isostatic pressing mode;
the blank is rolled and formed by controlling the direction-adjusting, so that the ZrC reinforced FeCrAl alloy is obtained, and the method for controlling the direction-adjusting rolling in the hot rolling process comprises the following steps: firstly hot rolling in the widening direction, wherein the total deformation is 20% -30%, and then rolling in the length direction, wherein the hot rolling temperature is 1080 ℃ -1200 ℃, the hot rolling termination temperature is 920 ℃ -980 ℃, and the rolling quantity is 70% -85%.
2. The method for preparing the ZrC reinforced FeCrAl alloy according to claim 1, wherein the particle size of the FeCrAl alloy powder is 80-150 μm; and/or the particle size of the ZrC nano powder is 100 nm-150 nm.
3. The method for preparing a ZrC enhanced FeCrAl alloy according to claim 1, wherein the low temperature ball milling design parameters include: the working vacuum degree is 80 Pa-120 Pa, and/or the ball-material ratio is 8:1-12:1, and/or the rotating speed is 350 r/min-400 r/min, and/or the ball milling time is 10 h-12 h.
4. The method for preparing the ZrC reinforced FeCrAl alloy according to claim 1, wherein a dispersing agent is added in the high-energy ball milling process.
5. The method for preparing the ZrC reinforced FeCrAl alloy according to claim 1, wherein the high-energy ball milling parameter design comprises the following steps: the ball-material ratio is 8:1-10:1, and/or the rotating speed is 180 r/min-250 r/min, and/or the ball milling time is 20-30h.
6. The method for preparing a ZrC reinforced FeCrAl alloy as claimed in claim 1, wherein the hot isostatic pressing parameter design comprises: the temperature is 1000-1050 ℃, and/or the applied pressure is 100-150 MPa, and/or the dwell time is 25-35 min.
7. A ZrC reinforced FeCrAl alloy, which is prepared by the method of any one of claims 1 to 6.
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