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High-strength austenitic stainless steel and preparation method thereof

An austenitic stainless steel, high-strength technology, applied in the field of iron and steel metallurgy, can solve problems such as general strengthening effect

Active Publication Date: 2021-08-10
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the application of enhanced particles is aimed at a single type and a single scale of particles, and the enhanced effect is generally

Method used

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  • High-strength austenitic stainless steel and preparation method thereof

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preparation example Construction

[0044] The preparation method of the high-strength austenitic stainless steel of the present invention comprises the following steps:

[0045] (1) Preparation of nanoparticles: the size of the nanometer Y of 10-15nm 2 o 3 and nano-Al powder with a size of 10-30nm are placed in a ball mill for high-speed ball-milling alloying; wherein nano-Y 2 o 3 The mass ratio to nano-Al powder is 3:1-1.5, the ball-to-material ratio is 10:1-1.5, the high-speed ball milling speed is 550-600 rpm, the ball milling time is 5-7 hours, and the ball milling atmosphere is atmospheric atmosphere.

[0046] (2) Nanoparticle ball mill mixing: the nanoparticles and austenitic steel powder prepared in step (1) are placed in a ball mill for high-speed ball mill mixing; wherein the size of the austenitic stainless steel is 40 to 50 μm, and the nanoparticles and The mass ratio of austenitic steel is 0.1-0.2:100, high-speed ball milling, the ball-to-material ratio is 10:1-1.5, the speed is 500-550 rpm, the ...

Embodiment 1

[0052] The high-strength austenitic stainless steel in this embodiment includes an austenitic stainless steel matrix and micron nitrides, submicron oxides and nano-oxides dispersed in the austenitic stainless steel matrix; wherein, the micron nitrides are TiN, and the submicron Oxide is Al 2 o 3 , the nano oxide is Y-Al-O. In high-strength austenitic stainless steel, the mass content of micron particles is 0.005%, the particle size is 0.5-1.0 μm, and the number is 1.2×10 14 piece / m 3 ; The mass content of submicron particles is 0.002%, the particle size is 0.1-0.5 μm, and the number is 9.1×10 17 piece / m 3 ; The mass content of nanoparticles is 0.1%, the particle size is 5-10nm, and the number is 1.3×10 2 piece / m 3 . Austenitic stainless steel matrix is ​​304 austenitic stainless steel matrix

[0053] The preparation method of the high-strength austenitic stainless steel of the present embodiment comprises the following steps:

[0054] (1) Preparation of nanoparticles:...

Embodiment 2

[0062] The high-strength austenitic stainless steel in this embodiment includes an austenitic stainless steel matrix and micron nitrides, submicron oxides and nano-oxides dispersed in the austenitic stainless steel matrix; wherein, the micron nitrides are TiN, and the submicron Oxide is Al 2 o 3 , the nano oxide is Y-Al-O. In high-strength austenitic stainless steel, the mass content of micron particles is 0.01%, the particle size is 0.5-1.0 μm, and the number is 8.6×10 14 piece / m 3 ; The mass content of submicron particles is 0.001%, the particle size is 0.1-0.5 μm, and the number is 1.3×10 17 piece / m 3 ; The mass content of nanoparticles is 0.2%, the particle size is 5-10nm, and the number is 9.1×10 25 piece / m 3 . Austenitic stainless steel matrix is ​​304 austenitic stainless steel matrix

[0063] The preparation method of the high-strength austenitic stainless steel of the present embodiment comprises the following steps:

[0064] (1) Preparation of nanoparticles:...

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Abstract

The invention discloses high-strength austenitic stainless steel and a preparation method thereof. The high-strength austenitic stainless steel comprises an austenitic stainless steel matrix as well as micron nitride, submicron oxide and nano oxide which are dispersed and distributed in the austenitic stainless steel matrix, wherein the micron nitride is TiN, the submicron oxide is Al2O3, and the nano oxide is Y-Al-O. During preparation, mixed powder A is subjected to laser melting forming; and then the structure property is controlled. The mixed powder A is obtained by ball-milling and mixing micron nitride and powder B; the powder B is obtained by ball-milling the submicron oxide and the powder C; the powder C is obtained by ball-milling nano oxide and austenite steel powder; and the nano oxide is obtained by carrying out ball milling and solid solution on nano Y2O3 and nano Al powder. The austenitic stainless steel is strengthened by introducing various particles with different sizes into the steel by utilizing an oxide metallurgy technology and a dispersion strengthening theory, the process and product reproducibility is good, the cleanliness is the same, and the structure and the performance are easy to control.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a high-strength austenitic stainless steel and a preparation method thereof. Background technique [0002] The main pipeline of the primary circuit is one of the seven key equipment in the nuclear island. It is called the "aorta" of the nuclear power plant and belongs to the first-level nuclear component. The main pipeline connects the reactor pressure vessel, the steam generator and the reactor cooler pump, so that these devices form a closed circuit. Its main function is to transport pressurized water containing radioactive substances and maintain the integrity of the pressure boundary to prevent the leakage of radioactive substances. The main pipeline has to run for decades under the condition of high temperature and high pressure, the service environment is harsh, and the manufacturing technology requirements are high. [0003] After the Fukush...

Claims

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Application Information

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IPC IPC(8): B22F10/28B22F10/64B22F9/04C22C32/00C22C33/02B33Y10/00B33Y40/20
CPCB22F3/24B22F9/04C22C32/0026C22C33/0207B33Y10/00B33Y40/20B22F2003/248B22F2009/043Y02P10/25
Inventor 邱国兴李小明白冲韦旭立贺芸李林波
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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