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Method for preparing oxide dispersion strengthened steel by adopting ultralow-temperature mechanical alloying technology

A mechanical alloying and dispersion strengthening technology, applied in low temperature treatment and other directions, can solve the problem of high ductile-brittle transition temperature, improve impact toughness, reduce impurity adsorption and defect generation, and increase entropy value.

Inactive Publication Date: 2018-02-16
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem of high ductile-brittle transition temperature of oxide dispersion strengthened steel prepared under the existing process conditions, the purpose of the present invention is to provide a method for preparing oxide dispersion strengthened steel by using ultra-low temperature mechanical alloying technology, the method is mainly in- Mechanical alloying at an ultra-low temperature below 50°C improves the impact toughness of oxide dispersion-strengthened steel by reducing the ordered rearrangement rate of atoms during the mechanical alloying process, and significantly reduces the ductile-brittle transition temperature, thereby Improve the safety of use under its service conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] An improved low-activation martensitic steel for reactor structure materials, in which the components account for the total mass fractions: C 0.08%, Cr 9.11%, Mn 0.34%, Si 0.30%, W 1.50%, V 0.22%, Ta 0.18%, N0.007%, P≤0.02%, S≤0.01%, Al≤0.04%, Y 2 o 3 0.3%, the balance is Fe.

[0019] The specific steps for preparing the low-activation martensitic steel described in this example by ultra-low temperature mechanical alloying technology are as follows:

[0020] (1) Add 500g of 9Cr alloy atomized powder into the ball mill jar, and at the same time add 1.5g of Y with an average particle size of 25nm 2 o 3 powder, and 7.5kg of low-carbon steel balls with a diameter of 5mm are used as the ball milling medium, and then liquid nitrogen is introduced into the cavity of the ball milling tank, and the ball milling temperature is controlled between -50°C and -80°C at a speed of 500r / min Lower ball milling for 18 hours, stop feeding liquid nitrogen after ball milling, and obtain...

Embodiment 2

[0027] An oxidation-resistant and corrosion-resistant reactor structural material 13Cr oxide dispersion strengthened steel, wherein the percentages of the components in the total mass are: C 0.03%, Cr 13.2%, W 1.6%, Ti 0.28%, N 0.008%, P ≤0.02%, S≤0.01%, Y 2 o 3 0.3%, the balance is Fe.

[0028] The specific steps for preparing the 13Cr oxide dispersion-strengthened steel described in this example by low-temperature mechanical alloying technology are as follows:

[0029] (1) 423g Fe, 65g Cr, 9g W, 1.5g Ti and 1.5g Y with an average particle size of 25nm 2 o 3 Put it into the ball mill tank, then add 7.5kg of low-carbon steel balls with a diameter of 5mm, and feed liquid nitrogen into the cavity of the ball mill tank, and control the ball mill temperature between -50°C and -80°C at a speed of 350r / min Lower ball milling for 20 hours, stop feeding liquid nitrogen after ball milling, and obtain mechanical alloyed powder;

[0030] (2) Move the ball-milled powder into a 304 s...

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Abstract

The invention relates to a method for preparing oxide dispersion strengthened steel by adopting an ultralow-temperature mechanical alloying technology. The method belongs to the technical field of special steel production, and is mainly characterized by mechanically alloying at the ultralow temperature of below -50 DEG C; through reducing ordering rearrangement speed of atoms during a mechanical alloying process, the impurity adsorption and the defect generation are reduced, and an entropy value of the oxide dispersion strengthened steel is improved, so that the impact ductility of the oxide dispersion strengthened steel is improved, the ductile-brittle transition temperature is remarkably reduced, and the use safety under the service conditions is improved.

Description

technical field [0001] The invention relates to a method for preparing oxide dispersion strengthened steel by using ultra-low temperature mechanical alloying technology, and belongs to the technical field of special steel production. Background technique [0002] Materials are one of the key factors restricting the development of nuclear energy. Oxide dispersion strengthened steel is a new type of alloy under development, which has the advantages of high strength, long creep life, and resistance to neutron irradiation, so it has become the preferred structural material for the fourth generation fission reactor and future fusion reactor. However, oxide dispersion strengthened steel has the problems of poor impact toughness and high ductile-brittle transition temperature (DBTT), which are one of the key problems restricting its practical application. The preparation process has a significant effect on the toughness and DBTT of oxide dispersion strengthened steel. The main pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/02B22F9/04B22F3/15B22F3/18C22C38/26C22C38/24C22C38/22C22C38/04C22C38/02C22C38/06C22C38/28
CPCC22C32/0026B22F3/15B22F3/18B22F9/04B22F2003/185B22F2009/041B22F2009/043B22F2998/10B22F2999/00C22C33/0228C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26C22C38/28B22F2202/03
Inventor 黄群英吴宜灿毛小东刘少军吴庆生
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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