CN113231648B - High-strength austenitic stainless steel and preparation method thereof - Google Patents

High-strength austenitic stainless steel and preparation method thereof Download PDF

Info

Publication number
CN113231648B
CN113231648B CN202110476133.6A CN202110476133A CN113231648B CN 113231648 B CN113231648 B CN 113231648B CN 202110476133 A CN202110476133 A CN 202110476133A CN 113231648 B CN113231648 B CN 113231648B
Authority
CN
China
Prior art keywords
ball milling
powder
stainless steel
nano
austenitic stainless
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202110476133.6A
Other languages
Chinese (zh)
Other versions
CN113231648A (en
Inventor
邱国兴
李小明
白冲
韦旭立
贺芸
李林波
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xian University of Architecture and Technology
Original Assignee
Xian University of Architecture and Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xian University of Architecture and Technology filed Critical Xian University of Architecture and Technology
Priority to CN202110476133.6A priority Critical patent/CN113231648B/en
Publication of CN113231648A publication Critical patent/CN113231648A/en
Application granted granted Critical
Publication of CN113231648B publication Critical patent/CN113231648B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
    • B33Y40/20—Post-treatment, e.g. curing, coating or polishing
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
    • C22C32/0015—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides with only single oxides as main non-metallic constituents
    • C22C32/0026—Matrix based on Ni, Co, Cr or alloys thereof
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0207—Using a mixture of prealloyed powders or a master alloy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B22F2003/248—Thermal after-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
    • B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Abstract

The invention discloses a high-strength austenitic stainless steel and a preparation method thereof, wherein the high-strength austenitic stainless steel comprises an austenitic stainless steel matrix and micron nitrides, submicron oxides and nanometer oxides which are dispersed in the austenitic stainless steel matrix; wherein the micron nitride is TiN, and the submicron oxide is Al 2 O 3 The nano oxide is Y-Al-O. When in preparation, the mixed powder A is subjected to laser melting molding; regulating and controlling the tissue performance; wherein the mixed powder A is obtained by ball milling and mixing micron nitride and powder B; the powder B is submicron oxide and the powder C is obtained by ball milling; the powder C is obtained by ball milling of nano oxide and austenitic steel powder; the nano oxide is nano Y 2 O 3 And nano Al powder is obtained by ball milling and solid solution. The invention introduces various particles with different sizes into the steel by utilizing the oxide metallurgy technology and the dispersion strengthening theory to strengthen the austenitic stainless steel, and has the advantages of good process and product reproducibility, same cleanliness and easy control of structure and performance.

Description

High-strength austenitic stainless steel and preparation method thereof
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to high-strength austenitic stainless steel and a preparation method thereof.
Background
A main pipeline of a loop is one of seven key devices in a nuclear island, is called as an 'main artery' of a nuclear power plant and belongs to a nuclear primary component. The main pipeline is connected with the reactor pressure vessel, the steam generator and the reactor cooler pump, so that the devices form a closed loop. Its main function is to transport the pressurized water containing the radioactive material and to maintain the integrity of the pressure boundary and prevent the radioactive material from leaking out. The main pipeline runs for decades under the working conditions of high temperature and high pressure, the service environment is harsh, and the manufacturing technical requirement is high.
After the fukuai accident, people pay more attention to the safety of nuclear power. The development of high-strength structural materials cannot be avoided for nuclear power safety. At present, the heat transfer tube materials of international steam generators are made of austenitic stainless steel, mainly 304, 304L, 304N, 316 and 316L. The operation experience of foreign nuclear power plants shows that the failure of the heat transfer pipe is one of the main factors influencing the safe operation of the nuclear power plant. Therefore, the improvement of the mechanical property of the heat transfer tube material and the manufacturing process thereof become problems which need to be solved at present.
The introduction of high melting point oxides with fine size into steel can pin dislocation and subgrain boundaries, block dislocation movement and inhibit grain growth, thereby strengthening the material; because the melting point of the oxide is higher, the introduced oxide can not be re-dissolved into the matrix at the temperature close to the melting point of the material, so that the material still has good strength at high temperature.
In the seventies of the last century, technicians in the new-day iron company utilized the pinning effect of TiN particles to improve the toughness of the weld heat affected zone. TiN belongs to high temperature resistant particles and can keep stability at 1400 ℃. In the cooling stage of a welding area, TiN particles effectively prevent HAZ austenite grains from growing and improve the toughness of the HAZ austenite grains by pinning austenite grain boundaries. However, TiN in the process is generated in the steelmaking process, and the size and the quantity are not controllable. Besides, scientists all over the world also introduce nano-SiO into steel by means of mechanical alloying and sintering 2 、Al 2 O 3 、MgO、TiO 2 、ZrO 2 And Y 2 O 3 And the high-melting point oxide improves the mechanical property of the alloy. Due to the inherent defects of the above process, the process and product reproducibility are poor, and it is difficult to prepare steels with the same cleanliness and the same structure and performance. The effect of different sizes and different types of particles on the structure and mechanical properties of the steel is different and this effect is necessarily a synergistic effect on the properties of the material. At present, the reinforced particles are applied to reinforcing particles of single type and single sizeThe effect is general.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide high-strength austenitic stainless steel and a preparation method thereof.
The technical scheme adopted by the invention is as follows:
a high-strength austenitic stainless steel comprises an austenitic stainless steel matrix and micron nitrides, submicron oxides and nanometer oxides which are dispersedly distributed in the austenitic stainless steel matrix;
wherein the micron nitride is TiN, and the submicron oxide is Al 2 O 3 The nano oxide is Y-Al-O.
Preferably, in the high-strength austenitic stainless steel, the mass content of the micron particles is 0.005-0.01%, the particle size is 0.5-1.0 μm, and the number is 10 14 ～10 15 Per m 3 ；
The sub-micron particles have a mass content of 0.001-0.002%, a particle size of 0.1-0.5 μm and a number of 10 17 ～10 18 Per m 3 ；
The mass content of the nano particles is 0.1-0.2%, the particle size is 5-10 nm, and the number is 10 25 ～10 26 Per m 3 。
Preferably, the austenitic stainless steel matrix is a 304 austenitic stainless steel matrix, a 304L austenitic stainless steel matrix, a 304N austenitic stainless steel matrix, a 316 austenitic stainless steel matrix or a 316L austenitic stainless steel matrix.
The invention also provides a preparation method of the high-strength austenitic stainless steel, which can be used for preparing the high-strength austenitic stainless steel, and comprises the following steps:
carrying out laser melting molding on the mixed powder A to obtain a molded body;
regulating and controlling the structure performance of the formed body to remove the thermal stress in the formed body and spheroidize a Ti-rich phase in the formed body;
wherein the mixed powder A is obtained by ball milling and mixing micron nitride and powder B;
the powder B is obtained by ball milling submicron oxide and powder C;
the powder C is obtained by ball milling of nano oxide and austenitic steel powder;
the nano oxide is nano Y 2 O 3 And nano Al powder are obtained by ball milling and solid solution;
the micron nitride is TiN, the submicron oxide is Al 2 O 3 。
Preferably, the preparation process of the nano-oxide comprises the following steps:
subjecting nanometer Y with the size of 10-15 nm 2 O 3 And carrying out high-speed ball milling alloying with nano Al powder with the size of 10-30 nm, wherein in the high-speed ball milling alloying process, the ball-material ratio is 10: 1-1.5, the high-speed ball milling rotating speed is 550-600 r/min, the ball milling time is 5-7 h, the ball milling atmosphere is atmospheric atmosphere, and the nano Y is 2 O 3 The mass ratio of the nano Al powder to the nano Al powder is 3: 1-1.5.
Preferably, the preparation process of the powder C comprises:
and (2) carrying out high-speed ball milling and mixing on the nano oxide with the size of 5-10 nm and the austenitic steel powder with the size of 40-50 mu m, wherein in the high-speed ball milling and mixing process, the ball-material ratio is 10: 1-1.5, the rotating speed is 500-550 r/min, the ball milling time is 7-10 h, the ball milling atmosphere is an inert atmosphere, and the mass ratio of the nano oxide to the austenitic steel powder is 0.1-0.2: 100.
Preferably, the preparation process of the powder B comprises the following steps:
carrying out medium-speed ball milling and mixing on the submicron oxide with the size of 0.5-1 mu m and the powder C, wherein in the process of the medium-speed ball milling and mixing, the ball-material ratio is 5: 1-1.5, the rotating speed is 300-350 r/min, the ball milling time is 2-3 h, the ball milling atmosphere is inert atmosphere, and the mass ratio of the submicron particles to the austenite steel in the powder C is 0.01-0.02: 100.
Preferably, the preparation process of the mixed powder a comprises:
and (2) carrying out low-speed ball milling and mixing on the micron nitride with the size of 1-1.5 microns and the powder B, wherein in the process of low-speed ball milling and mixing, the ball-material ratio is 5: 1-1.5, the rotating speed is 200-250 revolutions per minute, the ball milling time is 1-2 hours, the ball milling atmosphere is an inert atmosphere, and the mass ratio of the micron particles to the austenitic steel in the powder B is 0.05-0.1: 100.
Preferably, during the laser melting forming process: the laser power is 300-325W, the scanning speed is 1200-1700 mm/s, the layer thickness is 45-50 μm, the scanning distance is 50 μm, and the inert atmosphere is adopted.
Preferably, in the tissue performance regulation and control process, the formed body is heated to 1200-1250 ℃, then is subjected to heat preservation for 1-1.5 hours, then is subjected to air cooling to room temperature, is heated to 700-750 ℃ and is subjected to heat preservation for 2-2.5 hours, and then is subjected to air cooling to room temperature.
The invention has the following beneficial effects:
the micron nitride, the submicron oxide and the nanometer oxide in the high-strength austenitic stainless steel are dispersedly distributed in an austenitic stainless steel matrix, the micron nitride and the submicron oxide particles can pin the grain boundary to achieve the effects of fine grains and strengthening, and the submicron oxide and the nanometer oxide particles can pin the dislocation to achieve the effect of second phase strengthening. According to the invention, the austenite stainless steel is strengthened by introducing various particles with different sizes into the austenite stainless steel, and the problem that the structure of the austenite stainless steel cannot be regulated in a heat treatment manner because both the room-temperature structure and the high-temperature structure of the austenite stainless steel are austenite is solved.
Further, the strengthening effect of the second phase in the steel is directly related to its chemical composition, size, shape, amount and distribution. In order to obtain good strengthening effect, in the high-strength austenitic stainless steel, the mass content of micron particles is 0.005-0.01 percent, the particle size is 0.5-1.0 mu m, and the number is 10 14 ～10 15 Per m 3 (ii) a The sub-micron particles have a mass content of 0.001-0.002%, a particle size of 0.1-0.5 μm and a number of 10 17 ～10 18 Per m 3 (ii) a The mass content of the nano particles is 0.1-0.2%, the particle size is 5-10 nm, and the number is 10 25 ～10 26 Per m 3 . Through the control of the parameters, the high-strength austenitic stainless steel realizes good strengthening effect through the second phase.
In the preparation method of the high-strength austenitic stainless steel, the mixed powder A can be uniformly distributed in the austenitic stainless steel matrix through a laser melting forming technology, so that the strength of the steel is obviously improved, and the preparation method has an important significance for improving the safety of a nuclear power station; the nano oxide is nano Y 2 O 3 And nano Al powder is obtained by ball milling and solid solution, and nano Y 2 O 3 And the new phase Y-Al-O can be generated by ball milling and solid solution of the nano Al powder, so that the types of the strengthening examples of the high-strength austenitic stainless steel are increased, and the strengthening effect is better. The structure performance regulation and control can remove the residual thermal stress in the forming body in the laser melting forming process, and spheroidize the Ti-rich phase in the forming body, thereby improving the strength of the high-strength austenitic stainless steel.
Further, in the preparation process of the nano oxide, nano Y with the size of 10-15 nm is used 2 O 3 Carrying out high-speed ball milling alloying with nano Al powder with the size of 10-30 nm to ensure that Y 2 O 3 Reacting with Al to generate Y-Al-O; the ball milling atmosphere is atmosphere, and O in the air is generated in the ball milling process 2 The introduction of (2) is beneficial to the progress of the solid solution reaction, and the high ball-to-material ratio is beneficial to the progress of the chemical reaction.
Further, in the preparation process of the powder C, the nano oxide and the austenitic steel powder with the size of 40-50 μm are subjected to high-speed ball milling and mixed, the high-speed ball milling can provide sufficient energy and is beneficial to solid solution of the nano powder, the nano powder is solid-dissolved in the steel, so that the yield of the nano particles is 100%, namely how much nano powder is added into the final steel, and the inert atmosphere is used for preventing the oxidation of the steel powder.
Furthermore, in the preparation process of the powder B, the submicron oxide with the size of 0.5-1 μm and the powder C are subjected to medium-speed ball milling and mixed, the medium-speed ball milling aims to ensure that part of submicron particles are dissolved and part of submicron particles are not dissolved, and because the subsequent austenite steel powder is formed by laser, the loss of powder is caused by airflow generated by laser, the submicron oxide and the powder C are added according to 10 times of the target components in the ball milling process, and the mass fraction of the submicron particles in the final steel sample can be accurately controlled by combining with the subsequent printing process.
Furthermore, in the preparation process of the mixed powder A, the micron nitride with the size of 1-1.5 microns and the powder B are subjected to low-speed ball milling and mixing, the purpose of low-speed ball milling is to enable the micron particles and the steel powder to be fully mixed without solid solution, and because the subsequent steel powder molding adopts laser molding, the loss of the powder can be caused by airflow generated by laser, the micron nitride and the steel powder are added according to 10 times of the target components in the ball milling process, and the mass fraction of the micron particles in the final steel sample can be accurately controlled by combining with the subsequent printing process.
Furthermore, according to the composition of the high-strength austenitic stainless steel, the quality of printing is better by adopting corresponding parameters, and a formed body with qualified performance is obtained.
Further, in the structure performance regulation and control process, residual thermal stress in the laser melting forming process can be removed through high-temperature heat preservation at 1200-1250 ℃, and heat preservation at 700-750 ℃ is used for spheroidizing Ti-rich phases in steel.
Detailed Description
The present invention will be further described with reference to the following examples.
The high-strength austenitic stainless steel comprises an austenitic stainless steel matrix and micron nitrides, submicron oxides and nanometer oxides which are dispersedly distributed in the austenitic stainless steel matrix; wherein the micron nitride is TiN, and the submicron oxide is Al 2 O 3 The nano oxide is Y-Al-O. In the high-strength austenitic stainless steel, the mass content of the micron particles is 0.005-0.01 percent, the particle size is 0.5-1.0 mu m, and the number is 10 14 ～10 15 Per m 3 (ii) a The sub-micron particles have a mass content of 0.001-0.002%, a particle size of 0.1-0.5 μm and a number of 10 17 ～10 18 Per m 3 (ii) a The mass content of the nano particles is 0.1-0.2%, the particle size is 5-10 nm, and the number is 10 25 ～10 26 Per m 3 . The austenitic stainless steel matrix is 304 austenitic stainless steel matrix, 304L austenitic stainless steel matrixA body stainless steel substrate, a 304N austenitic stainless steel substrate, a 316 austenitic stainless steel substrate, or a 316L austenitic stainless steel substrate
The preparation method of the high-strength austenitic stainless steel comprises the following steps:
(1) preparing nano particles: nano Y with the size of 10-15 nm 2 O 3 And nano Al powder with the size of 10-30 nm are placed in a ball mill for high-speed ball milling alloying; wherein nano Y 2 O 3 The mass ratio of the nano Al powder to the nano Al powder is 3: 1-1.5, the ball-material ratio is 10: 1-1.5, the high-speed ball milling rotation speed is 550-600 r/min, the ball milling time is 5-7 h, and the ball milling atmosphere is atmospheric atmosphere.
(2) Ball milling and mixing of nano particles: placing the nano particles and the austenitic steel powder prepared in the step (1) into a ball mill for high-speed ball milling and mixing; the size of the austenitic stainless steel is 40-50 microns, the mass ratio of the nano particles to the austenitic steel is 0.1-0.2: 100, high-speed ball milling is carried out, the ball-material ratio is 10: 1-1.5, the rotating speed is 500-550 r/min, the ball milling time is 7-10 h, and the ball milling atmosphere is inert atmosphere.
(3) Ball milling and mixing sub-micron particles: carrying out medium-speed ball milling and mixing on the submicron oxide with the size of 0.5-1 mu m and the powder prepared in the step (2); wherein the mass ratio of the submicron particles to the austenitic steel is 0.01-0.02: 100, the ball milling is carried out at medium speed, the ball-material ratio is 5: 1-1.5, the rotating speed is 300-350 r/min, the ball milling time is 2-3 h, and the ball milling atmosphere is inert atmosphere.
(4) And (3) carrying out ball milling and mixing on micron particles: carrying out low-speed ball milling and mixing on micron nitrides with the size of 1-1.5 microns and the powder prepared in the step (3); wherein the mass ratio of the micron particles to the austenitic steel is 0.05-0.1: 100, the material ratio of the low-speed ball milling balls is 5: 1-1.5, the rotating speed is 200-250 r/min, the ball milling time is 1-2 h, and the ball milling atmosphere is inert atmosphere.
(5) Performing laser melting molding on the mixture obtained in the step (4): the laser power is 300-325W, the scanning speed is 1200-1700 mm/s, the layer thickness is 45-50 μm, the scanning distance is 50 μm, and the inert atmosphere is adopted;
(6) regulating and controlling tissue performance: and (4) placing the steel sample formed in the step (5) at 1200-1250 ℃, preserving heat for 1-1.5 h, then air cooling to room temperature, then heating to 700-750 ℃, preserving heat for 2-2.5 h, and then air cooling to room temperature.
Example 1
The high-strength austenitic stainless steel comprises an austenitic stainless steel matrix and micron nitrides, submicron oxides and nanometer oxides which are dispersedly distributed in the austenitic stainless steel matrix; wherein the micron nitride is TiN, and the submicron oxide is Al 2 O 3 The nano oxide is Y-Al-O. In the high-strength austenitic stainless steel, the mass content of the microparticles is 0.005%, the particle size is 0.5-1.0 μm, and the number is 1.2 x 10 14 Per m 3 (ii) a The sub-micron particles have a mass content of 0.002%, a particle size of 0.1-0.5 μm, and a number of 9.1 × 10 17 Per m 3 (ii) a The nano particles have a mass content of 0.1%, a particle size of 5-10 nm and a number of 1.3 × 10 2 Per m 3 . The austenitic stainless steel matrix is 304 austenitic stainless steel matrix
The preparation method of the high-strength austenitic stainless steel comprises the following steps:
(1) preparing nanoparticles: subjecting nanometer Y with the size of 5-10 nm 2 O 3 And nano Al powder with the size of 15-30 nm are placed in a ball mill for high-speed ball milling alloying; wherein nano Y 2 O 3 The mass ratio of the nano Al powder to the nano Al powder is 3:1.5, the ball-material ratio is 10:1, the high-speed ball milling rotating speed is 550 revolutions per minute, the ball milling time is 7 hours, and the ball milling atmosphere is atmospheric atmosphere.
(2) Ball milling and mixing of nano particles: placing the nano particles prepared in the step (1) and austenitic steel powder in a ball mill for high-speed ball milling and mixing; the method comprises the steps of grinding austenitic stainless steel, grinding, ball milling, and the like, wherein the size of the austenitic stainless steel is 40-50 mu m, the mass ratio of nano particles to the austenitic steel is 0.1:100, the ball-material ratio is 10:1.5, the rotating speed is 550 revolutions per minute, the ball milling time is 7 hours, and the ball milling atmosphere is inert atmosphere.
(3) Ball milling and mixing sub-micron particles: carrying out medium-speed ball milling and mixing on the submicron oxide with the size of 0.5-1 mu m and the powder prepared in the step (2); wherein the mass ratio of the submicron particles to the austenitic steel is 0.02:100, the ball milling is carried out at medium speed, the ball-material ratio is 5:1, the rotating speed is 300 r/min, the ball milling time is 3h, and the ball milling atmosphere is inert atmosphere.
(4) And (3) carrying out ball milling and mixing on micron particles: carrying out low-speed ball milling and mixing on micron nitrides with the size of 1-1.5 microns and the powder prepared in the step (3); wherein the mass ratio of the micro particles to the austenitic steel is 0.05:100, the material ratio of the low-speed ball milling balls is 5:1, the rotating speed is 200 r/min, the ball milling time is 2h, and the ball milling atmosphere is inert atmosphere.
(5) Performing laser melting molding on the mixture obtained in the step (4): the laser power is 300W, the scanning speed is 1200mm/s, the layer thickness is 45 μm, the scanning distance is 50 μm, and the inert atmosphere is adopted;
(6) regulating and controlling tissue performance: and (3) placing the steel sample formed in the step (5) at 1200 ℃ for heat preservation for 1.5h, then air-cooling to room temperature, then heating to 750 ℃ for heat preservation for 2h, and then air-cooling to room temperature.
The table of the performance test of the high strength austenitic stainless steel manufactured in this example is shown in table 1.
Example 2
The high-strength austenitic stainless steel comprises an austenitic stainless steel matrix and micron nitrides, submicron oxides and nanometer oxides which are dispersedly distributed in the austenitic stainless steel matrix; wherein the micron nitride is TiN, and the submicron oxide is Al 2 O 3 The nano oxide is Y-Al-O. In the high-strength austenitic stainless steel, the mass content of the micron particles is 0.01 percent, the particle size is 0.5-1.0 mu m, and the number is 8.6 multiplied by 10 14 Per m 3 (ii) a The sub-micron particles have a mass content of 0.001%, a particle size of 0.1 to 0.5 μm and a number of 1.3X 10 17 Per m 3 (ii) a The mass content of the nano particles is 0.2 percent, the particle size is 5-10 nm, and the number is 9.1 multiplied by 10 25 Per m 3 . The austenitic stainless steel matrix is 304 austenitic stainless steel matrix
The preparation method of the high-strength austenitic stainless steel comprises the following steps:
(1) preparing nanoparticles: subjecting nanometer Y with the size of 5-10 nm 2 O 3 And placing the nano Al powder with the size of 15-30 nm into a ball mill for high-speed ball milling alloying(ii) a Wherein nano Y 2 O 3 The mass ratio of the nano Al powder to the nano Al powder is 3:1, the ball-material ratio is 10:1.5, the high-speed ball milling rotating speed is 600 revolutions per minute, the ball milling time is 5 hours, and the ball milling atmosphere is atmospheric atmosphere.
(2) Ball milling and mixing of nano particles: placing the nano particles and the austenitic steel powder prepared in the step (1) into a ball mill for high-speed ball milling and mixing; the size of the austenitic stainless steel is 40-50 mu m, the mass ratio of the nano particles to the austenitic steel is 0.2:100, high-speed ball milling is carried out, the ball-material ratio is 10:1, the rotating speed is 500 r/min, the ball milling time is 10 hours, and the ball milling atmosphere is inert atmosphere.
(3) Sub-micron particle ball milling and mixing: carrying out medium-speed ball milling and mixing on the submicron oxide with the size of 0.5-1 mu m and the powder prepared in the step (2); wherein the mass ratio of the submicron particles to the austenitic steel is 0.01:100, the ball milling is carried out at medium speed, the ball-material ratio is 5:1.5, the rotating speed is 350 r/min, the ball milling time is 2h, and the ball milling atmosphere is inert atmosphere.
(4) And (3) carrying out ball milling and mixing on micron particles: carrying out low-speed ball milling and mixing on the micron nitride with the size of 1-1.5 microns and the powder prepared in the step (3); wherein the mass ratio of the micro particles to the austenitic steel is 0.1:100, the material ratio of the low-speed ball milling balls is 5:1.5, the rotating speed is 250 r/min, the ball milling time is 1h, and the ball milling atmosphere is inert atmosphere.
(5) Performing laser melting molding on the mixture obtained in the step (4): the laser power is 325W, the scanning speed is 1700mm/s, the layer thickness is 50 μm, the scanning distance is 50 μm, and the inert atmosphere is adopted;
(6) regulating and controlling tissue performance: and (4) placing the steel sample formed in the step (5) at 1250 ℃, preserving heat for 1h, then air-cooling to room temperature, then heating to 700 ℃, preserving heat for 2.5h, and then air-cooling to room temperature.
The table of the performance test of the high strength austenitic stainless steel manufactured in this example is shown in table 1.
Example 3
The high-strength austenitic stainless steel comprises an austenitic stainless steel matrix and micron nitrides, submicron oxides and nanometer oxides which are dispersedly distributed in the austenitic stainless steel matrix; wherein the micron nitride is TiN, and the submicron oxide is Al 2 O 3 The nano oxide is Y-Al-O. In the high-strength austenitic stainless steel, the mass content of micron particles is 0.008 percent, the particle size is 0.5-1.0 mu m, and the number is 5.6 multiplied by 10 14 Per m 3 (ii) a The sub-micrometer particles are 0.0015% by mass, 0.1-0.5 μm in size and 6.7 × 10 in number 17 Per m 3 (ii) a The nano particles have a mass content of 0.14%, a particle size of 5-10 nm and a number of 5.9 × 10 25 ～10 26 Per m 3 . The austenitic stainless steel matrix is 304 austenitic stainless steel matrix
The preparation method of the high-strength austenitic stainless steel comprises the following steps:
(1) preparing nano particles: subjecting nanometer Y with the size of 5-10 nm 2 O 3 And nano Al powder with the size of 15-30 nm are placed in a ball mill for high-speed ball milling alloying; wherein nano Y 2 O 3 The mass ratio of the nano Al powder to the nano Al powder is 3:1.3, the ball-material ratio is 10:1.25, the high-speed ball milling rotating speed is 580 r/min, the ball milling time is 6h, and the ball milling atmosphere is atmospheric atmosphere.
(2) Ball-milling and mixing nano particles: placing the nano particles and the austenitic steel powder prepared in the step (1) into a ball mill for high-speed ball milling and mixing; the size of the austenitic stainless steel is 40-50 mu m, the mass ratio of the nano particles to the austenitic steel is 0.14:100, the high-speed ball milling is carried out, the ball-material ratio is 10:1.25, the rotating speed is 530 revolutions per minute, the ball milling time is 8 hours, and the ball milling atmosphere is inert atmosphere.
(3) Ball milling and mixing sub-micron particles: carrying out medium-speed ball milling and mixing on the submicron oxide with the size of 0.5-1 mu m and the powder prepared in the step (2); wherein the mass ratio of the submicron particles to the austenitic steel is 0.015:100, the ball-material ratio is 5:1.3, the rotating speed is 330 r/min, the ball-milling time is 2.5h, and the ball-milling atmosphere is inert atmosphere.
(4) And (3) carrying out ball milling and mixing on micron particles: carrying out low-speed ball milling and mixing on micron nitrides with the size of 1-1.5 microns and the powder prepared in the step (3); wherein the mass ratio of the micro particles to the austenitic steel is 0.08:100, the material ratio of the low-speed ball milling balls is 5:1.3, the rotating speed is 230 r/min, the ball milling time is 1.6h, and the ball milling atmosphere is inert atmosphere.
(5) Performing laser melting molding on the mixture obtained in the step (4): the laser power is 310W, the scanning speed is 1500mm/s, the layer thickness is 48 mu m, the scanning distance is 50 mu m, and the inert atmosphere is adopted;
(6) regulating and controlling tissue performance: and (3) placing the steel sample formed in the step (5) at 1230 ℃ for heat preservation for 1.2h, then air-cooling to room temperature, then heating to 730 ℃ for heat preservation for 2.3h, and then air-cooling to room temperature.
Table 1 shows the performance test table of the high strength austenitic stainless steel produced in this example.
Example 4
The high-strength austenitic stainless steel comprises an austenitic stainless steel matrix and micron nitrides, submicron oxides and nanometer oxides which are dispersed in the austenitic stainless steel matrix; wherein the micron nitride is TiN, and the submicron oxide is Al 2 O 3 The nano oxide is Y-Al-O. In the high-strength austenitic stainless steel, the mass content of micron particles is 0.007 percent, the particle size is 0.5 to 1.0 mu m, and the number is 6.2 multiplied by 10 14 Per m 3 (ii) a The sub-micrometer particles are 0.0013% by mass, 0.1-0.5 μm in size and 2.1 × 10 in number 17 Per m 3 (ii) a The mass content of the nano particles is 0.18 percent, the particle size is 5-10 nm, and the number is 8.5 multiplied by 10 25 Per m 3 . The austenitic stainless steel matrix is 304L austenitic stainless steel matrix
The preparation method of the high-strength austenitic stainless steel comprises the following steps:
(1) preparing nano particles: subjecting nanometer Y with the size of 5-10 nm 2 O 3 And nano Al powder with the size of 15-30 nm are placed in a ball mill for high-speed ball milling alloying; wherein the nanometer Y 2 O 3 The mass ratio of the nano Al powder to the nano Al powder is 3:1.5, the ball-material ratio is 10:1, the high-speed ball milling rotating speed is 600 revolutions per minute, the ball milling time is 5 hours, and the ball milling atmosphere is atmospheric atmosphere.
(2) Ball milling and mixing of nano particles: placing the nano particles and the austenitic steel powder prepared in the step (1) into a ball mill for high-speed ball milling and mixing; the austenitic stainless steel is 40-50 mu m in size, the mass ratio of the nano particles to the austenitic steel is 0.18:100, high-speed ball milling is carried out, the ball-material ratio is 10:1, the rotating speed is 550 revolutions per minute, the ball milling time is 7 hours, and the ball milling atmosphere is inert atmosphere.
(3) Ball milling and mixing sub-micron particles: carrying out medium-speed ball milling and mixing on the submicron oxide with the size of 0.5-1 mu m and the powder prepared in the step (2); wherein the mass ratio of the submicron particles to the austenitic steel is 0.013:100, the ball-milling is carried out at medium speed, the ball-material ratio is 5:1.5, the rotating speed is 350 r/min, the ball-milling time is 2h, and the ball-milling atmosphere is inert atmosphere.
(4) And (3) carrying out ball milling and mixing on micron particles: carrying out low-speed ball milling and mixing on micron nitrides with the size of 1-1.5 microns and the powder prepared in the step (3); wherein the mass ratio of the micro particles to the austenitic steel is 0.07:100, the material ratio of the low-speed ball milling balls is 5:1, the rotating speed is 250 r/min, the ball milling time is 1h, and the ball milling atmosphere is inert atmosphere.
(5) Performing laser melting molding on the mixture obtained in the step (4): the laser power is 325W, the scanning speed is 1700mm/s, the layer thickness is 45 μm, the scanning interval is 50 μm, and the inert atmosphere is adopted;
(6) regulating and controlling tissue performance: and (4) placing the steel sample formed in the step (5) at 1250 ℃, preserving heat for 1h, then air-cooling to room temperature, then heating to 750 ℃, preserving heat for 2h, and then air-cooling to room temperature.
Table 1 shows the performance test table of the high strength austenitic stainless steel produced in this example.
Example 5
The high-strength austenitic stainless steel comprises an austenitic stainless steel matrix and micron nitrides, submicron oxides and nanometer oxides which are dispersedly distributed in the austenitic stainless steel matrix; wherein the micron nitride is TiN, and the submicron oxide is Al 2 O 3 The nano oxide is Y-Al-O. In the high-strength austenitic stainless steel, the mass content of the micron particles is 0.009%, the particle size is 0.5-1.0 μm, and the number is 7.9 × 10 14 Per m 3 (ii) a The sub-micron particles have a mass content of 0.0014%, a particle size of 0.1 to 0.5 μm and a number of 3.1 × 10 17 Per m 3 (ii) a The mass content of the nano particles is 0.17 percent, the particle size is 5-10 nm, and the number is 7.1 multiplied by 10 25 Per m 3 . The austenitic stainless steel matrix is 304N austenitic stainless steel matrix
The preparation method of the high-strength austenitic stainless steel comprises the following steps:
(1) preparing nanoparticles: subjecting nanometer Y with the size of 5-10 nm 2 O 3 And nano Al powder with the size of 15-30 nm are placed in a ball mill for high-speed ball milling alloying; wherein nano Y 2 O 3 The mass ratio of the nano Al powder to the nano Al powder is 3:1, the ball-material ratio is 10:1.5, the high-speed ball milling rotating speed is 550 revolutions per minute, the ball milling time is 7 hours, and the ball milling atmosphere is atmospheric atmosphere.
(2) Ball milling and mixing of nano particles: placing the nano particles and the austenitic steel powder prepared in the step (1) into a ball mill for high-speed ball milling and mixing; the method comprises the steps of grinding austenitic stainless steel, grinding, ball milling, and the like, wherein the size of the austenitic stainless steel is 40-50 mu m, the mass ratio of nano particles to the austenitic steel is 0.17:100, the ball-material ratio is 10:1.5, the rotating speed is 500 revolutions per minute, the ball milling time is 10 hours, and the ball milling atmosphere is inert atmosphere.
(3) Sub-micron particle ball milling and mixing: carrying out medium-speed ball milling and mixing on the submicron oxide with the size of 0.5-1 mu m and the powder prepared in the step (2); wherein the mass ratio of the submicron particles to the austenitic steel is 0.014:100, the medium-speed ball milling is carried out, the ball-material ratio is 5:1, the rotating speed is 300 r/min, the ball milling time is 3h, and the ball milling atmosphere is inert atmosphere.
(4) And (3) carrying out ball milling and mixing on micron particles: carrying out low-speed ball milling and mixing on the micron nitride with the size of 1-1.5 microns and the powder prepared in the step (3); wherein the mass ratio of the micro particles to the austenitic steel is 0.09:100, the material ratio of the low-speed ball milling balls is 5:1.5, the rotating speed is 200 r/min, the ball milling time is 2 hours, and the ball milling atmosphere is inert atmosphere.
(5) Performing laser melting molding on the mixture obtained in the step (4): the laser power is 300W, the scanning speed is 1200mm/s, the layer thickness is 50 μm, the scanning distance is 50 μm, and the inert atmosphere is adopted;
(6) regulating and controlling tissue performance: and (3) placing the steel sample formed in the step (5) at 1200 ℃ for heat preservation for 1.5h, then air-cooling to room temperature, then heating to 700 ℃ for heat preservation for 2.5h, and then air-cooling to room temperature.
Table 1 shows the performance test table of the high strength austenitic stainless steel produced in this example.
Example 6
The high-strength austenitic stainless steel comprises an austenitic stainless steel matrix and micron nitrides, submicron oxides and nanometer oxides which are dispersedly distributed in the austenitic stainless steel matrix; wherein the micron nitride is TiN, and the submicron oxide is Al 2 O 3 The nano oxide is Y-Al-O. In the high-strength austenitic stainless steel, the mass content of the micron particles is 0.006, the particle size is 0.5-1.0 μm, and the number is 1.9 multiplied by 10 14 Per m 3 (ii) a The sub-micron particles have a mass content of 0.0016%, a particle size of 0.1-0.5 μm and a number of 5.6 × 10 17 Per m 3 (ii) a The nano particles have a mass content of 0.14%, a particle size of 5-10 nm and a number of 4.9 × 10 25 ～10 26 Per m 3 . The austenitic stainless steel matrix is 316 austenitic stainless steel matrix
The preparation method of the high-strength austenitic stainless steel comprises the following steps:
(1) preparing nano particles: subjecting nanometer Y with the size of 5-10 nm 2 O 3 And nano Al powder with the size of 15-30 nm are placed in a ball mill for high-speed ball milling alloying; wherein nano Y 2 O 3 The mass ratio of the nano Al powder to the nano Al powder is 3:1.3, the ball-material ratio is 10:1.4, the high-speed ball milling rotating speed is 590 r/min, the ball milling time is 5.5h, and the ball milling atmosphere is atmospheric atmosphere.
(2) Ball milling and mixing of nano particles: placing the nano particles and the austenitic steel powder prepared in the step (1) into a ball mill for high-speed ball milling and mixing; the size of the austenitic stainless steel is 40-50 mu m, the mass ratio of the nano particles to the austenitic steel is 0.14:100, the high-speed ball milling is carried out, the ball-material ratio is 10:1.25, the rotating speed is 525 r/min, the ball milling time is 8.5h, and the ball milling atmosphere is inert atmosphere.
(3) Ball milling and mixing sub-micron particles: carrying out medium-speed ball milling and mixing on the submicron oxide with the size of 0.5-1 mu m and the powder prepared in the step (2); wherein the mass ratio of the submicron particles to the austenitic steel is 0.016:100, the ball-material ratio is 5:1.25, the rotating speed is 335 r/min, the ball-milling time is 2.5h, and the ball-milling atmosphere is inert atmosphere.
(4) And (3) carrying out ball milling and mixing on micron particles: carrying out low-speed ball milling and mixing on micron nitrides with the size of 1-1.5 microns and the powder prepared in the step (3); wherein the mass ratio of the micro particles to the austenitic steel is 0.06:100, the material ratio of the low-speed ball milling balls is 5:1.3, the rotating speed is 240 r/min, the ball milling time is 1.8h, and the ball milling atmosphere is inert atmosphere.
(5) Performing laser melting molding on the mixture obtained in the step (4): the laser power is 320W, the scanning speed is 1600mm/s, the layer thickness is 49 μm, the scanning distance is 50 μm, and the atmosphere is inert;
(6) regulating and controlling tissue performance: and (3) placing the steel sample formed in the step (5) at 1240 ℃ for heat preservation for 1.4h, then cooling to room temperature in air, then heating to 740 ℃ for heat preservation for 2.4h, and then cooling to room temperature in air.
The table of the performance test of the high strength austenitic stainless steel manufactured in this example is shown in table 1.
Example 7
The high-strength austenitic stainless steel comprises an austenitic stainless steel matrix and micron nitrides, submicron oxides and nanometer oxides which are dispersedly distributed in the austenitic stainless steel matrix; wherein the micron nitride is TiN, and the submicron oxide is Al 2 O 3 The nano oxide is Y-Al-O. In the high-strength austenitic stainless steel, the mass content of the micron particles is 0.01 percent, the particle size is 0.5 to 1.0 mu m, and the number is 8.7 multiplied by 10 14 Per m 3 (ii) a The sub-micron particles have a mass content of 0.0018%, a particle size of 0.1 to 0.5 μm and a number of 7.9 × 10 17 Per m 3 (ii) a The mass content of the nano particles is 0.17 percent, the particle size is 5-10 nm, and the number is 8.2 multiplied by 10 25 Per m 3 . The austenitic stainless steel matrix is 316L austenitic stainless steel matrix
The preparation method of the high-strength austenitic stainless steel comprises the following steps:
(1) preparing nano particles: subjecting nanometer Y with the size of 5-10 nm 2 O 3 And nano Al powder with the size of 15-30 nm are placed in a ball mill for high-speed ball milling alloying; wherein the nanometer Y 2 O 3 The mass ratio of the nano Al powder to the nano Al powder is 3:1.5, the ball-material ratio is 10:1, the high-speed ball milling rotating speed is 600 revolutions per minute, the ball milling time is 5 hours, and the ball milling atmosphere is atmospheric atmosphere.
(2) Ball milling and mixing of nano particles: placing the nano particles and the austenitic steel powder prepared in the step (1) into a ball mill for high-speed ball milling and mixing; the method comprises the steps of grinding austenitic stainless steel, grinding, and ball milling, wherein the size of the austenitic stainless steel is 40-50 mu m, the mass ratio of nano particles to the austenitic steel is 0.17:100, the ball-material ratio is 10:1, the rotating speed is 500 r/min, the ball milling time is 7h, and the ball milling atmosphere is inert atmosphere.
(3) Ball milling and mixing sub-micron particles: carrying out medium-speed ball milling and mixing on the submicron oxide with the size of 0.5-1 mu m and the powder prepared in the step (2); wherein the mass ratio of the submicron particles to the austenitic steel is 0.018:100, the ball-milling is carried out at a medium speed, the ball-material ratio is 5:1, the rotating speed is 350 r/min, the ball-milling time is 2h, and the ball-milling atmosphere is inert atmosphere.
(4) And (3) carrying out ball milling and mixing on micron particles: carrying out low-speed ball milling and mixing on micron nitrides with the size of 1-1.5 microns and the powder prepared in the step (3); wherein the mass ratio of the micro particles to the austenitic steel is 0.1:100, the material ratio of the low-speed ball milling balls is 5:1, the rotating speed is 250 r/min, the ball milling time is 1h, and the ball milling atmosphere is inert atmosphere.
(5) Performing laser melting molding on the mixture obtained in the step (4): the laser power is 325W, the scanning speed is 1700mm/s, the layer thickness is 50 μm, the scanning interval is 50 μm, and the inert atmosphere is adopted;
(6) regulating and controlling tissue performance: and (4) placing the steel sample formed in the step (5) at 1250 ℃, preserving heat for 1h, then air-cooling to room temperature, then heating to 750 ℃, preserving heat for 2h, and then air-cooling to room temperature.
The table of the performance test of the high strength austenitic stainless steel manufactured in this example is shown in table 1.
TABLE 1
Figure BDA0003047162050000151
As can be seen from Table 1, the invention introduces various particles with different sizes into the steel by utilizing the oxide metallurgy technology and the dispersion strengthening theory to strengthen the austenitic stainless steel, and has higher mechanical property, wherein the yield strength at room temperature can reach 651-694 MPa, the yield strength at 650 ℃ can reach 397-440 MPa, and the yield strength at 700 ℃ can reach 351-401 MPa.

Claims (3)

1. The high-strength austenitic stainless steel is characterized by comprising an austenitic stainless steel matrix and micron nitrides, submicron oxides and nanometer oxides which are dispersedly distributed in the austenitic stainless steel matrix;
wherein the micron nitride is TiN, and the submicron oxide is Al 2 O 3 The nano oxide is Y-Al-O;
in the high-strength austenitic stainless steel, the mass content of micron particles is 0.005-0.01%, the particle size is 0.5-1.0 mu m, and the number is 10 14 ~10 15 Per m 3 ；
The sub-micron particles have a mass content of 0.001-0.002%, a particle size of 0.1-0.5 μm and a number of 10 17 ~10 18 Per m 3 ；
The mass content of the nano particles is 0.1-0.2%, the particle size is 5-10 nm, and the number is 10 25 ~10 26 Per m 3 。
2. The high-strength austenitic stainless steel of claim 1, wherein the austenitic stainless steel matrix is a 304 austenitic stainless steel matrix, a 304L austenitic stainless steel matrix, a 304N austenitic stainless steel matrix, a 316 austenitic stainless steel matrix or a 316L austenitic stainless steel matrix.
3. A preparation method of high-strength austenitic stainless steel is characterized by comprising the following steps:
performing laser melting molding on the mixed powder A to obtain a molded body;
regulating and controlling the structure performance of the formed body to remove the thermal stress in the formed body and spheroidize a Ti-rich phase in the formed body;
wherein the mixed powder A is obtained by ball-milling and mixing micron nitride and powder B;
the powder B is obtained by ball milling submicron oxide and powder C;
the powder C is obtained by ball milling of nano oxide and austenitic steel powder;
the nano oxide is nano Y 2 O 3 And nano Al powder are obtained by ball milling and solid solution;
the micron nitride is TiN, the submicron oxide is Al 2 O 3 ；
The preparation process of the nano oxide comprises the following steps:
nano Y with the size of 10-15 nm 2 O 3 And carrying out high-speed ball milling alloying with nano Al powder with the size of 10-30 nm, wherein in the high-speed ball milling alloying process, the ball-material ratio is 10: 1-1.5, the high-speed ball milling rotating speed is 550-600 r/min, the ball milling time is 5-7 h, the ball milling atmosphere is atmospheric atmosphere, and the nano Y is 2 O 3 The mass ratio of the nano Al powder to the nano Al powder is 3: 1-1.5;
the preparation process of the powder C comprises the following steps:
carrying out high-speed ball milling and mixing on the nano oxide and the austenitic steel powder with the size of 40-50 mu m, wherein in the high-speed ball milling and mixing process, the ball-material ratio is 10: 1-1.5, the rotating speed is 500-550 r/min, the ball milling time is 7-10 h, the ball milling atmosphere is inert atmosphere, and the mass ratio of the nano oxide to the austenitic steel powder is 0.1-0.2: 100;
the preparation process of the powder B comprises the following steps:
carrying out medium-speed ball milling and mixing on 0.5-1.0 mu m submicron oxide and powder C, wherein in the process of the medium-speed ball milling and mixing, the ball-material ratio is 5: 1-1.5, the rotating speed is 300-350 r/min, the ball milling time is 2-3 h, the ball milling atmosphere is inert atmosphere, and the mass ratio of the submicron particles to the austenite steel in the powder C is 0.01-0.02: 100;
the preparation process of the mixed powder A comprises the following steps:
carrying out low-speed ball milling mixing on micron nitride with the size of 1-1.5 microns and the powder B, wherein in the low-speed ball milling mixing process, the ball-material ratio is 5: 1-1.5, the rotating speed is 200-250 r/min, the ball milling time is 1-2 h, the ball milling atmosphere is inert atmosphere, and the mass ratio of micron particles to austenitic steel in the powder B is 0.05-0.1: 100;
in the laser melting forming process: the laser power is 300-325W, the scanning speed is 1200-1700 mm/s, the layer thickness is 45-50 μm, the scanning distance is 50 μm, and the inert atmosphere is adopted;
in the structure performance regulation and control process, the formed body is heated to 1200-1250 ℃, then is subjected to heat preservation for 1-1.5 h, then is subjected to air cooling to room temperature, is heated to 700-750 ℃ and is subjected to heat preservation for 2-2.5 h, and then is subjected to air cooling to room temperature.
CN202110476133.6A 2021-04-29 2021-04-29 High-strength austenitic stainless steel and preparation method thereof Active CN113231648B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110476133.6A CN113231648B (en) 2021-04-29 2021-04-29 High-strength austenitic stainless steel and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110476133.6A CN113231648B (en) 2021-04-29 2021-04-29 High-strength austenitic stainless steel and preparation method thereof

Publications (2)

Publication Number Publication Date
CN113231648A CN113231648A (en) 2021-08-10
CN113231648B true CN113231648B (en) 2022-08-19

Family

ID=77131722

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110476133.6A Active CN113231648B (en) 2021-04-29 2021-04-29 High-strength austenitic stainless steel and preparation method thereof

Country Status (1)

Country Link
CN (1) CN113231648B (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004137600A (en) * 2002-09-27 2004-05-13 Nano Gijutsu Kenkyusho:Kk Superhard, tough nanocrystal austenitic steel bulk material having excellent corrosion resistance
CN105039857A (en) * 2015-06-15 2015-11-11 北京科技大学 Oxide-dispersion-strengthening ferrite/martensitic steel and preparing method
CN106755728A (en) * 2016-11-23 2017-05-31 东北大学 Improve additional nano reinforcement agent and its preparation and application of steel mechanics performance

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6245439B1 (en) * 1994-08-09 2001-06-12 Kabushiki Kaisha Toyoyta Chuo Kenkyusho composite material and method for the manufacture
JP3689009B2 (en) * 2001-02-27 2005-08-31 株式会社日立製作所 High corrosion resistance high strength austenitic stainless steel and its manufacturing method
CN102828097A (en) * 2012-09-16 2012-12-19 北京科技大学 Method for preparing nitrogen-contained ODS (oxide dispersion strengthened) nickel-free austenite alloy by mechanical alloying process
CN102994884B (en) * 2012-12-03 2014-10-29 东北大学 Efficient preparation method for nanostructure oxide dispersion strengthening steel
CN103966408B (en) * 2013-01-30 2016-03-16 中国科学院金属研究所 A kind of technique obtaining multiple dimensioned nitride strengthening martensite heat-resistant steel
CN104862571B (en) * 2015-06-16 2017-12-29 武汉理工大学 Multiple dimensioned micro nano structure WC CoCr metal-ceramic composite powders end
CN105132827B (en) * 2015-09-09 2017-03-29 南京工程学院 A kind of high heat-intensity forged steel material for obtaining ultra tiny compound yardstick carbide
CN105154788B (en) * 2015-09-09 2017-03-01 南京工程学院 Have heat-resisting alloy steel and its micro structure modulation process of across yardstick multiphase In-sltu reinforcement effect
CN108950357B (en) * 2018-07-27 2020-03-27 中南大学 Multi-scale multiphase dispersion strengthening iron-based alloy and preparation and characterization method thereof
CN108907209B (en) * 2018-07-27 2020-04-07 中南大学 Oxide dispersion strengthening iron-based alloy powder and characterization method thereof
CN109570508B (en) * 2018-12-13 2022-03-29 北京科技大学 Preparation method of oxide dispersion strengthened ferrite steel with double-grain size distribution
CN109554572B (en) * 2018-12-27 2020-03-20 吉林大学 Multi-scale ceramic particle-mixed high-elasticity-modulus high-strength aluminum alloy and preparation method thereof
CN110565002B (en) * 2019-10-17 2021-12-03 中国科学院合肥物质科学研究院 Selective laser melting additive manufacturing method suitable for oxide reinforced steel
CN111992706B (en) * 2020-08-26 2021-12-24 昆明理工大学 Cross-scale self-lubricating particle reinforced steel-based composite material and preparation method thereof
CN111957967B (en) * 2020-08-30 2023-01-03 中南大学 Method for preparing multi-scale ceramic phase reinforced metal composite material through 3D printing

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004137600A (en) * 2002-09-27 2004-05-13 Nano Gijutsu Kenkyusho:Kk Superhard, tough nanocrystal austenitic steel bulk material having excellent corrosion resistance
CN105039857A (en) * 2015-06-15 2015-11-11 北京科技大学 Oxide-dispersion-strengthening ferrite/martensitic steel and preparing method
CN106755728A (en) * 2016-11-23 2017-05-31 东北大学 Improve additional nano reinforcement agent and its preparation and application of steel mechanics performance

Also Published As

Publication number Publication date
CN113231648A (en) 2021-08-10

Similar Documents

Publication Publication Date Title
CN105274445B (en) A kind of oxide dispersion intensifying low activation steel and preparation method thereof
CN105543747B (en) A kind of preparation method for the increasing material manufacturing nickel base superalloy for remaining with Laves phases
CN108796345B (en) Oxidation preparation method of nano composite oxide dispersion strengthening Fe-based alloy
CN101328562B (en) Oxide dispersion strengthening low activity martensitic steel material and preparation thereof
JP3689009B2 (en) High corrosion resistance high strength austenitic stainless steel and its manufacturing method
CN109182882A (en) A kind of preparation method of high intensity oxide dispersion intensifying Fe based alloy
CN108330408B (en) A kind of high intensity alferric ferritic ODS steel and preparation method thereof
CN109207765A (en) The method that power forging prepares oxide-dispersed alloy
CN109967742A (en) A kind of nickel base superalloy and preparation method thereof
CN107971499A (en) The method for preparing spherical titanium aluminium-based alloyed powder end
CN107058852B (en) A method of residual ferrite in refinement oxide dispersion intensifying martensite steel
CN106868383A (en) The method that nano-structure oxide dispersion strengthened steel workpiece is prepared with 3D printing technique
CN107952966A (en) The preparation method at spherical titanium aluminium-based alloyed powder end
CN113832369B (en) Metastable beta titanium alloy with ultrahigh yield strength and high plasticity manufactured by additive manufacturing
CN113231648B (en) High-strength austenitic stainless steel and preparation method thereof
CN113862499A (en) Processing and manufacturing method of novel titanium-based composite material with two-state tissue
CN110079723A (en) High-strength high-plastic 304 stainless steel of one kind and preparation method thereof
CN113231649A (en) Nano rare earth composite oxide reinforced 316LN stainless steel composite material and preparation method thereof
CN111647825B (en) Second phase control method of nuclear power stainless steel medium plate
CN114480901B (en) Method for manufacturing nickel-based superalloy performance through carbide reinforced additive, nickel-based superalloy powder and application of nickel-based superalloy powder
CN111036895B (en) Preparation method of oxygen supersaturated precursor powder for nano-oxide dispersion strengthened steel
CN114959508A (en) Stainless steel and preparation method thereof
CN113201681B (en) Oxide-reinforced austenitic stainless steel and preparation method thereof
CN113462949B (en) Method for preparing dispersion oxide reinforced section steel based on powder metallurgy process
CN112593161B (en) High-strength Sc composite nano oxide dispersion strengthening Fe-based alloy and preparation method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant