CN111014602A - Method for preparing oxide dispersion strengthened steel by adopting front-drive powder induced nucleation through thin-strip continuous casting process - Google Patents
Method for preparing oxide dispersion strengthened steel by adopting front-drive powder induced nucleation through thin-strip continuous casting process Download PDFInfo
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Abstract
The invention discloses a method for preparing oxide dispersion strengthened steel by adopting a strip continuous casting process through a precursor powder induced nucleation, which comprises the following steps: (1) obtaining supersaturated oxide dispersion alloy powder; (2) smelting to obtain molten steel; (3) injecting the molten steel in the tundish into a molten pool, spraying supersaturated oxide dispersion alloy powder into the molten steel in the molten pool through argon, and enabling the molten steel to pass through two crystallization rollers to form a casting strip blank; (4) and (3) after the cast strip blank is taken out of the roller, rapidly cooling the cast strip blank at the speed of 30-150 ℃/s under the protection of atmosphere. The supersaturated oxide dispersion alloy powder is used as precursor powder to induce rapid nucleation, and the nano oxide dispersion strengthened steel is prepared by a short-flow thin strip continuous casting technology, so that the problems of uneven and thick oxide distribution caused by long-time stirring of the alloy powder in a smelting furnace are solved, the large-scale preparation of the nano oxide dispersion strengthened steel is realized, and the material can be ensured to have better toughness.
Description
Technical Field
The invention relates to the technical field of special material preparation, in particular to a method for preparing oxide dispersion strengthened steel by adopting a strip continuous casting process through a precursor powder induction nucleation process.
Background
The oxide dispersion strengthened steel is a novel special steel with high strength, radiation resistance and corrosion resistance, and the main application field of the oxide dispersion strengthened steel is a nuclear reactor in-pile structural material and can also be used as a high-strength heat-resistant part of an aeronautic engine and an aerospace engine. The oxide dispersion strengthened steel is mainly characterized in that nano oxides (1-100 nm) are uniformly dispersed in a steel substrate, and the uniformly distributed oxide dispersed phase can pin dislocation and grain boundary, remarkably improve the high-temperature mechanical property of the steel, absorb point defects generated by irradiation and remarkably improve the irradiation swelling resistance of the steel. The difficulty in preparing oxide dispersion strengthened steel lies in how to uniformly disperse and distribute the nano oxides in a steel matrix.
The smelting method becomes an effective way for realizing the large-scale high-efficiency preparation of the oxide dispersion strengthened steel. For example, chinese patent No. CN107541666B, entitled a method for preparing oxide dispersion strengthened steel, adds oxygen-saturated alloy powder prepared by mechanical alloying into molten steel, utilizes the characteristic of the alloy powder body having a similar density to the molten steel to realize uniform mixing, and realizes uniform mixing of high-number density nano oxides by rapid cooling. In the method, oxides are stirred and mixed with molten steel in a smelting furnace, in order to realize uniform dispersion of oxide alloy powder in the molten steel, the stirring time is prolonged along with the increase of the preparation scale of ODS steel, and the problems of nonuniform distribution and over-large size of the oxides are easy to occur during industrial scale preparation, so that the toughness of the material is reduced.
Disclosure of Invention
Aiming at the problems of low material toughness, low yield, high cost, unstable structure and difficulty in realizing industrial scale preparation in the existing preparation of oxide dispersion strengthened steel, the invention aims to solve the technical problem of providing a method for preparing the oxide dispersion strengthened steel by adopting a strip continuous casting process through the prior powder-driven induced nucleation so as to realize the rapid and uniform dispersion of supersaturated oxide dispersion alloy powder in molten steel, and the supersaturated oxide dispersion alloy powder is used as precursor powder for inducing the nano oxide nucleation to induce the rapid nucleation, and the solid-phase solid solution of oxygen and the high-number density dispersion precipitation of nano oxide are realized through the rolling of a crystallization roller and the rapid solidification.
In order to solve the technical problems, the invention adopts the following technical scheme: a method for preparing oxide dispersion strengthened steel by adopting a strip continuous casting process through a precursor powder induced nucleation process comprises the following steps:
(1) under the protection of atmosphere, adding Fe, Cr, Ti and oxide powder into a ball mill for mechanical alloying to obtain supersaturated oxide dispersion alloy powder, wherein the supersaturated oxide dispersion alloy powder is precursor powder for inducing the nucleation of the nano oxide;
(2) smelting to obtain molten steel, preheating a tundish to 1250-1300 ℃, then pouring the molten steel into the tundish, and controlling the superheat degree of the molten steel in the tundish to be 20-40 ℃;
(3) injecting the molten steel in the tundish into a molten pool formed by two crystallization rollers rotating in opposite directions and two side sealing plates, controlling the superheat degree of the molten steel in the molten pool to be 10-20 ℃, spraying supersaturated oxide dispersed alloy powder into the molten steel in the molten pool through argon, and simultaneously performing ultrasonic stirring on the molten steel in the molten pool, wherein the molten steel forms a casting strip blank through the two crystallization rollers;
(4) and (3) after the cast strip blank is taken out of the roller, rapidly cooling the cast strip blank at the speed of 30-150 ℃/s under the protection of atmosphere.
Further, in the step (1), the oxide is Y2O3、SiO2、ZrO2、HfO2、La2O3、CeO2、TiO2And CaO or a mixture of any two or more of them in an arbitrary ratio.
Further, in the step (1), the oxygen content of the prepared supersaturated oxide dispersion alloy powder is more than 0.5 percent by mass, and the density is more than 6.5g/cm3. By adopting the design, oxygen can be provided for the substrate, the formation of oxides is promoted, the density is close to that of molten steel, and the alloy powder is prevented from floating upwards to form slag.
Further, in the step (3), the contact arc length of the molten steel in the molten pool and the roller surface of the crystallization roller is 100-200 mm, and the contact time is 1-3 min. The molten steel has small and constant volume, so the design is convenient for the dispersion of alloy powder.
Further, in the step (4), the argon blowing pressure is 0.2-1 MPa. So as to ensure that the alloy powder added into the molten steel is adjustable.
Further, in the step (4), the ultrasonic frequency range is 20-90 kHz. So as to ensure the alloy powder in the molten steel to be rapidly and uniformly distributed on the premise of ensuring the liquid level to be stable.
Further, the speed of the molten steel passing through the two crystallization rollers is 30-50 m/min, and the ejection speed of the supersaturated oxide dispersion alloy powder is 1-2 kg/min. In the course of carrying out the present invention, the inventors have found that material forming is achieved at this rate and the properties of the resulting material are much better.
The invention has the beneficial effects that:
(1) the supersaturated oxide dispersion alloy powder is used as precursor powder to induce rapid nucleation, the nano oxide dispersion strengthened steel is prepared by a short-flow thin strip continuous casting technology, the rapid and uniform dispersion of the supersaturated oxide dispersion alloy powder in molten steel is realized in a molten pool, and the problems of uneven and thick oxide distribution caused by long-time stirring of the alloy powder in a smelting furnace are avoided, so that the large-scale preparation of the nano oxide dispersion strengthened steel is realized, and the material can be ensured to have better toughness.
(2) The method sprays oxygen supersaturated precursor alloy powder onto the surface of molten steel in a molten pool through argon, and realizes the rapid and uniform dispersion of the alloy powder through ultrasound, thereby avoiding the agglomeration and segregation of the alloy powder in the molten steel.
(3) The invention utilizes the rapid solidification characteristic of strip continuous casting to ensure that oxygen exists in molten steel in a solid phase mode and is dispersed and separated out in the process of rolling the crystal rolls.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
The components in the drawings are labeled as follows: 1, a vacuum induction furnace; 2, pouring a tundish; 3, an ultrasonic oscillator; 4, a molten pool; 5, a crystallizing roller; 6 casting the strip blank.
Detailed Description
Referring to FIG. 1, the present invention will be further described with reference to the following examples:
the various raw materials used in the following examples, unless otherwise specified, are all commercial products known in the art, and the purity of the raw materials for smelting is greater than 99%; the purity of the high-purity argon is more than 99.999 percent.
Example 1
Preparation of improved low-activation martensite-based oxide dispersion-strengthened steel
Based on the total mass of the improved low-activation martensitic oxide dispersion-strengthened steel taken as 100%, the components and mass percentages thereof are as follows: 0.1% of C, 9.0% of Cr, 1.5% of W, 0.20% of V, 0.19% of Ta, 0.45% of Mn0.05% of Si, 0.20% of Ti, and Y2O30.20 percent and the balance of Fe. The preparation method comprisesThe method comprises the following steps:
(1) under the protection of atmosphere (argon or nitrogen), according to the mass percentage, mixing Fe 90%, Ti 5% and Y2O35 percent of the alloy powder is added into a ball mill for mechanical alloying to obtain supersaturated oxide dispersion alloy powder, the oxygen content mass percent of the supersaturated oxide dispersion alloy powder is 1.9 percent, and the density of the supersaturated oxide dispersion alloy powder is 7.2g/cm3；
(2) CLAM (Chinese low-activation anti-radiation structural steel) molten steel is smelted by using a vacuum induction furnace 1, and based on the total mass of the CLAM molten steel being 100%, the CLAM molten steel comprises 0.1% of C, 9.0% of Cr, 1.5% of W, 0.20% of V, 0.19% of Ta, 0.45% of Mn, 0.05% of Si and the balance of Fe by mass percent;
(3) preheating the tundish 2 to 1300 ℃, then pouring CLAM molten steel into the tundish 2, and controlling the superheat degree of the molten steel in the tundish 2 to be 20 ℃;
(4) the molten steel in the tundish 2 is injected into a molten pool enclosed by two crystallization rollers 5 which rotate reversely and two side sealing plates (the side sealing plates are used for sealing gaps at two ends of the crystallization rollers, belong to the common knowledge of thin strip continuous casting and are not shown in the figures for simplicity), the superheat degree of the molten steel in the molten pool is controlled to be 10 ℃, the contact arc length of the molten steel in the molten pool and the roller surface of the crystallization roller 5 is 100mm, and the contact time is 1 min; spraying the prepared supersaturated oxide dispersion alloy powder into molten steel in a molten pool by argon, wherein the argon spraying pressure is 2MPa, the speed of the molten steel passing through two crystallization rollers is 30m/min, the spraying speed of the supersaturated oxide dispersion alloy powder is 1kg/min, ultrasonic stirring is applied to the molten steel in the molten pool by an ultrasonic oscillator 3 so as to realize the rapid and uniform dispersion of the supersaturated oxide dispersion alloy powder, the ultrasonic frequency range is 90kHz, and the molten steel passes through the two crystallization rollers to form a casting belt blank;
(5) and after the cast strip blank is taken out of the roller, rapidly cooling the cast strip blank at the speed of 30 ℃/s under the protection of nitrogen atmosphere to obtain the improved low-activation martensitic oxide dispersion strengthened steel which is marked as CLAM-ODS steel.
The analysis of the coagulated macrostructure of the CLAM-ODS steel prepared by the embodiment shows that the macrostructure has no shrinkage cavities, impurities and the likeDouble defects, which are not more than 0.5 grade of A, B, C, D type nonmetallic inclusions in the organization according to ASTM analysis. The size of the nano oxide in the tissue is 6.0 +/-1.5 nm and the number density is 1.3 multiplied by 10 after the analysis of a Transmission Electron Microscope (TEM)24m-2. Detecting according to the GBT/228 tensile test standard to obtain the CLAM-ODS steel with the room-temperature yield strength of 1020MPa and the elongation after fracture of 20 percent; the CLAM steel used as the matrix material has the room-temperature yield strength of 570MPa and the elongation after fracture of 22.5 percent. Therefore, the CLAM-ODS steel prepared by the embodiment further improves the high-temperature performance of the material on the basis of keeping the original excellent performance of the CLAM steel, and meanwhile, the production scale of the process is not limited, so that the basis is laid for the industrial scale application of the CLAM-ODS steel.
Example 2
Preparation of austenite-based oxide dispersion strengthened steel
The total mass of the austenite-based oxide dispersion strengthened steel of the embodiment is 100%, and the components and the mass percentages thereof are as follows: 0.08 percent of C, 17.0 percent of Cr, 12.8 percent of Ni, 2.2 percent of Mo, 1.5 percent of Mn, 0.50 percent of Ti, and Y2O30.3 percent and the balance of Fe. The preparation method comprises the following specific steps:
(1) under the protection of atmosphere (argon or nitrogen), according to the mass percentage, Fe 87%, Cr 10%, Ti 5% and Y2O3Adding 8 percent of the mixed powder into a ball mill for mechanical alloying to obtain supersaturated oxide dispersion alloy powder, wherein the oxygen content of the supersaturated oxide dispersion alloy powder is 3 percent by mass, and the density of the supersaturated oxide dispersion alloy powder is 7.0g/cm3；
(2) Smelting austenitic steel liquid by using a vacuum induction furnace 1, wherein the components and the mass percentage are 0.08 percent of C, 17.0 percent of Cr, 12.8 percent of Ni, 2.2 percent of Mo, 1.5 percent of Mn, 0.50 percent of Ti and the balance of Fe, wherein the total mass of the austenitic steel liquid is 100 percent;
(3) preheating the tundish 2 to 1250 ℃, then pouring molten steel into the tundish 2, and controlling the superheat degree of the molten steel in the tundish 2 to be 40 ℃;
(4) injecting the molten steel in the tundish 2 into a molten pool enclosed by two crystallization rollers 5 which rotate reversely and two side sealing plates, controlling the superheat degree of the molten steel in the molten pool to be 20 ℃, controlling the contact arc length of the molten steel in the molten pool and the roller surface of the crystallization roller 5 to be 200mm, and controlling the contact time to be 3 min; spraying the prepared oxygen supersaturated precursor alloy powder into molten steel in a molten pool by argon, wherein the argon spraying pressure is 0.2MPa, the speed of the molten steel passing through two crystallization rollers is 50m/min, the spraying speed of the supersaturated oxide dispersion alloy powder is 2kg/min, ultrasonic stirring is applied to the molten steel in the molten pool by an ultrasonic oscillator 3 so as to realize the rapid and uniform dispersion of the supersaturated oxide dispersion alloy powder, the ultrasonic frequency range is 20kHz, and the molten steel passes through the two crystallization rollers to form a casting belt blank;
(5) and after the cast strip blank is taken out of the roll, rapidly cooling the cast strip blank at the speed of 150 ℃/s under the protection of nitrogen atmosphere to obtain the austenite-based oxide dispersion strengthened steel.
The macroscopic structure analysis of the solidified austenitic-based oxide dispersion strengthened steel shows that the macroscopic structure has no macroscopic defects such as shrinkage cavities and inclusions, and the A, B, C, D-type nonmetallic inclusions in the macroscopic structure are not more than 0.5 grade according to the ASTM analysis. The size of the nano oxide in the tissue is 5.2 +/-1.5 nm and the number density is 1.8 multiplied by 10 after the analysis of a Transmission Electron Microscope (TEM)24m-2. Detecting according to GBT/228 tensile test standard to obtain the austenite-based oxide dispersion strengthened steel with the room temperature yield strength of 820MPa and the elongation after fracture of 35 percent; the used matrix material austenite steel has the room temperature yield strength of 350MPa and the elongation percentage after fracture of 45 percent. Therefore, the austenite-based oxide dispersion strengthened steel prepared by the embodiment further improves the high-temperature performance of the material. Meanwhile, the production scale of the process is not limited, and a foundation is laid for industrial scale application of the austenite-based oxide dispersion strengthened steel.
Example 3
Preparation of improved structural material low-activation martensitic oxide dispersion-strengthened steel
The improved structural material of the embodiment comprises the following components in percentage by mass, based on 100% of the total mass of the low-activation martensitic oxide dispersion-strengthened steel: 0.08 percent of C, 9.11 percent of Cr, 0.1 percent of Ti, 0.34 percent of Mn, 0.30 percent of Si, 1.50 percent of W, 0.22 percent of V, 0.18 percent of Ta, 0.007 percent of N, less than or equal to 0.02 percent of P, less than or equal to 0.01 percent of S, less than or equal to 0.04 percent of Al, less than or equal to 0.4 percent of Ni, Y2O30.1 percent of Ni and the balance of Fe. The preparation method comprises the following specific steps:
(1) 50 parts by weight of Fe powder, 40 parts by weight of Cr powder, 5 parts by weight of Ti powder and 5 parts by weight of Y powder2O3Adding the powder into a stirring ball mill, simultaneously adding stainless steel balls as a ball milling medium at a ball-material ratio of 20:1, then carrying out mechanical alloying under the protection of high-purity argon atmosphere, wherein the rotating speed of a stirring rod in the ball mill is 300r/min, the ball milling time is 50h, and a ball mill cavity is cooled by adopting room-temperature water in the ball milling process to obtain supersaturated oxide dispersion alloy powder; the supersaturated oxide dispersion alloy powder comprises, by mass, 100% of the total supersaturated oxide dispersion alloy powder, 0.05% of C, 40% of Cr, 5% of Ti, and Y2O35 percent, and the balance being Fe;
(2) CLAM (Chinese low-activation anti-radiation structural steel) molten steel is smelted by using a vacuum induction furnace 1, and the temperature of the molten steel is controlled to 1580 +/-20 ℃; based on 100 percent of the total mass of the CLAM molten steel, the CLAM molten steel comprises the following components, by mass, 0.10 percent of C, 0.45 percent of Mn, 0.32 percent of Si, 9.0 percent of Cr, 1.6 percent of W, 0.26 percent of V, 0.24 percent of Ta, 0.009 percent of N, less than or equal to 0.02 percent of P, less than or equal to 0.01 percent of S, less than or equal to 0.04 percent of Al, less than or equal to 0.4 percent of Ni, and the balance of Fe;
(3) preheating the tundish 2 to 1300 ℃, then pouring CLAM molten steel into the tundish 2, and controlling the superheat degree of the molten steel in the tundish 2 to be 20 ℃;
(4) injecting the molten steel in the tundish 2 into a molten pool enclosed by two crystallization rollers 5 which rotate reversely and two side sealing plates, controlling the superheat degree of the molten steel in the molten pool to be 10 ℃, controlling the contact arc length of the molten steel in the molten pool and the roller surface of the crystallization roller 5 to be 100mm, and controlling the contact time to be 1 min; spraying the prepared supersaturated oxide dispersion alloy powder into molten steel in a molten pool by argon, wherein the argon spraying pressure is 2MPa, the speed of the molten steel passing through two crystallization rollers is 30m/min, the spraying speed of the supersaturated oxide dispersion alloy powder is 1.2kg/min, ultrasonic stirring is applied to the molten steel in the molten pool by an ultrasonic oscillator 3 so as to realize the rapid and uniform dispersion of the supersaturated oxide dispersion alloy powder, the ultrasonic frequency range is 90kHz, and the molten steel passes through the two crystallization rollers to form a casting belt blank;
(5) and after the cast strip blank is taken out of the roller, rapidly cooling the cast strip blank at the speed of 30 ℃/s under the protection of nitrogen atmosphere to obtain the improved structural material low-activation martensitic oxide dispersion strengthened steel.
The improved structural material low-activation martensitic oxide dispersion strengthened steel prepared by the embodiment is detected according to the GBT/228 tensile test standard, and the room temperature yield strength is 1020MPa, the elongation after fracture is 26%, and the room temperature yield strength of the used base material CLAM steel is 680MPa, and the elongation is 25%. It can be seen that the performance of the material prepared by the embodiment is better than that of the CLAM-ODS steel prepared by the embodiment I of the patent CN 107541666B. Therefore, the invention can further improve the performance of the material.
Example 4
Preparation of austenite-based oxide dispersion strengthened steel
The oxide dispersion strengthened steel of the embodiment comprises the following components by mass percent, based on 100% of the total mass of the oxide dispersion strengthened steel: 0.08 percent of C, 16.8 percent of Cr, 12.8 percent of Ni, 2.2 percent of Mo, 1.3 percent of Mn, 0.50 percent of Ti, 0.007 percent of N, less than or equal to 0.03 percent of P, less than or equal to 0.02 percent of S, and Y2O30.25 percent and the balance of Fe. The preparation method comprises the following specific steps:
(1) 50 parts by weight of Fe powder, 40 parts by weight of Cr powder, 8 parts by weight of Ti powder and 2 parts by weight of Y powder2O3Adding the powder into a stirring ball mill, simultaneously adding stainless steel balls as a ball milling medium at a ball-material ratio of 20:1, then carrying out mechanical alloying under the protection of high-purity argon atmosphere, wherein the rotating speed of a stirring rod in the ball mill is 350r/min, the ball milling time is 40h, and a ball mill cavity is cooled by adopting room-temperature water in the ball milling process to obtain supersaturated oxide dispersion alloy powder; the supersaturated oxide dispersion alloy powder comprises, by mass, 100% of the total supersaturated oxide dispersion alloy powder, 0.06% of C, 40% of Cr, 8% of Ti, and Y2O32% and the balance of Fe;
(2) smelting molten steel by using a vacuum induction furnace 1, and controlling the temperature of the molten steel to 1580 +/-20 ℃; the molten steel comprises, by mass, 0.08% of C, 16.9% of Cr, 13.6% of Ni, 2.5% of Mo2, 1.7% of Mn, 0.009% of N, less than or equal to 0.03% of P, less than or equal to 0.02% of S and the balance of Fe, wherein the total mass of the molten steel is 100%;
(3) preheating the tundish 2 to 1250 ℃, then pouring molten steel into the tundish 2, and controlling the superheat degree of the molten steel in the tundish 2 to be 40 ℃;
(4) injecting the molten steel in the tundish 2 into a molten pool enclosed by two crystallization rollers 5 which rotate reversely and two side sealing plates, controlling the superheat degree of the molten steel in the molten pool to be 20 ℃, controlling the contact arc length of the molten steel in the molten pool and the roller surface of the crystallization roller 5 to be 200mm, and controlling the contact time to be 3 min; spraying the prepared oxygen supersaturated precursor alloy powder into molten steel in a molten pool by argon, wherein the argon spraying pressure is 0.2MPa, the speed of the molten steel passing through two crystallization rollers is 40m/min, the spraying speed of supersaturated oxide dispersion alloy powder is 1.5kg/min, ultrasonic stirring is applied to the molten steel in the molten pool by an ultrasonic oscillator 3 so as to realize the rapid and uniform dispersion of the supersaturated oxide dispersion alloy powder, the ultrasonic frequency range is 20kHz, and the molten steel passes through the two crystallization rollers to form a casting belt blank;
(5) and after the cast strip blank is taken out of the roll, rapidly cooling the cast strip blank at the speed of 150 ℃/s under the protection of nitrogen atmosphere to obtain the austenite-based oxide dispersion strengthened steel.
The austenitic-based oxide dispersion strengthened steel prepared in the embodiment is detected according to the GBT/228 tensile test standard, the yield strength at room temperature is 910MPa, the elongation percentage after fracture is 40%, the yield strength at high temperature of 650 ℃ is 242MPa, and the yield strength of the used base material 316L austenitic stainless steel is (room temperature: 350MPa, 650 ℃: 130 MP); it can be seen that the performance of the material prepared by the embodiment is superior to that of the austenite-based oxide dispersion strengthened steel prepared by the embodiment II of the patent CN 107541666B. Therefore, the invention can further improve the performance of the material.
It should be understood that the examples and embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and that various modifications or changes in light thereof will be suggested to persons skilled in the art and are to be included within the spirit and purview of this disclosure.
Claims (7)
1. A method for preparing oxide dispersion strengthened steel by adopting a strip continuous casting process through a precursor powder induced nucleation is characterized by comprising the following steps of: the method comprises the following steps:
(1) under the protection of atmosphere, adding Fe, Cr, Ti and oxide powder into a ball mill for mechanical alloying to obtain supersaturated oxide dispersion alloy powder, wherein the supersaturated oxide dispersion alloy powder is precursor powder for inducing the nucleation of the nano oxide;
(2) smelting to obtain molten steel, preheating a tundish to 1250-1300 ℃, then pouring the molten steel into the tundish, and controlling the superheat degree of the molten steel in the tundish to be 20-40 ℃;
(3) injecting the molten steel in the tundish into a molten pool enclosed by two crystallization rollers rotating in opposite directions and two side sealing plates, controlling the superheat degree of the molten steel in the molten pool to be 10-20 ℃, spraying supersaturated oxide dispersed alloy powder into the molten steel in the molten pool through argon, and simultaneously performing ultrasonic stirring on the molten steel in the molten pool, wherein the molten steel forms a casting strip blank through the two crystallization rollers;
(4) and (3) after the cast strip blank is taken out of the roller, rapidly cooling the cast strip blank at the speed of 30-150 ℃/s under the protection of atmosphere.
2. The method of preparing an oxide dispersion strengthened steel by a strip casting process with precursor powder induced nucleation according to claim 1, wherein: in the step (1), the oxide is Y2O3、SiO2、ZrO2、HfO2、La2O3、CeO2、TiO2And CaO or a mixture of any two or more of them in an arbitrary ratio.
3. The method of producing an oxide dispersion strengthened steel by a strip casting process with the precursor powder induced nucleation according to claim 1 or 2, wherein: in the step (1), the oxygen content of the prepared supersaturated oxide dispersion alloy powder is more than 0.5 percent by mass, and the density is more than 6.5g/cm3。
4. The method of producing an oxide dispersion strengthened steel by a strip casting process with the precursor powder induced nucleation according to claim 1 or 2, wherein: in the step (3), the contact arc length of the molten steel in the molten pool and the roller surface of the crystallization roller is 100-200 mm, and the contact time is 1-3 min.
5. The method of producing an oxide dispersion strengthened steel by a strip casting process with the precursor powder induced nucleation according to claim 1 or 2, wherein: in the step (4), the argon blowing pressure is 0.2-1 MPa.
6. The method of producing an oxide dispersion strengthened steel by a strip casting process with the precursor powder induced nucleation according to claim 1 or 2, wherein: in the step (4), the ultrasonic frequency range is 20-90 kHz.
7. The method of producing an oxide dispersion strengthened steel by a strip casting process with the precursor powder induced nucleation according to claim 1 or 2, wherein: the speed of the molten steel passing through the two crystallization rollers is 30-50 m/min, and the ejection speed of the supersaturated oxide dispersion alloy powder is 1-2 kg/min.
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