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Two-step method for preparing high-strength and high-toughness aluminum-containing oxide dispersion-strengthening ferritic steel

A technology of dispersion strengthening and aluminum oxide, which is applied in the field of two-step preparation of high-strength and high-toughness aluminum-containing oxide dispersion-strengthened ferritic steel, can solve ODS steel grain size and precipitated phase coarseness, material strength reduction, and material brittleness issues such as

Active Publication Date: 2020-05-19
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For ferrite / martensitic oxide dispersion strengthened steel, a major problem restricting its development is the poor corrosion resistance of materials
The usual method is to increase the Cr content to improve the corrosion resistance of the material, but the material will appear Cr-rich phase, resulting in aging embrittlement of the material
[0004] Although the addition of aluminum can improve the oxidation resistance of the material, it will also make the average grain size and precipitated phases of ODS steel coarser, resulting in a decrease in the strength of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Prepare 9.0% Cr, 1.6% W, 0.2% V, 3.0% Al, 0.35% Y 2 o 3 , the purity of the above raw materials is 99.9%, the content of C and N is less than 0.01%, and the rest is Fe, and the above are mass percentages;

[0028] (2) will divide Y 2 o 3 , Al, etc., according to the mass percentage in step (1) to prepare alloy powder by argon atomization method, the oxygen content is controlled below 0.04wt.%, and the particle size is 200-400 mesh particles as mechanical alloying spare powder;

[0029] (3) the standby powder of above-mentioned mechanical alloying and the Y in the step (1) 2 o 3 The ball mill tank is installed in the glove box under argon protection throughout the whole process. The mechanical alloying parameters are: ball-to-material ratio, that is, the mass ratio of ball milling medium to material is 10:1, the ball milling medium is stainless steel balls, and the speed is set at 300r / min. Carry out multiple ball milling according to the method of ball milling...

Embodiment 2

[0033] (1) Prepare 9.0% Cr, 1.5% Al, 0.35% Y 2 o 3 , the purity of the above raw materials is 99.9%, the content of C and N is less than 0.01%, and the rest is Fe, and the above are mass percentages;

[0034] (2) will divide Y 2 o 3, Al, etc., according to the mass percentage in step (1) to prepare alloy powder by argon atomization method, the oxygen content is controlled below 0.04wt.%, and the particle size is 200-400 mesh particles as mechanical alloying spare powder;

[0035] (3) the standby powder of above-mentioned mechanical alloying and the Y in the step (1) 2 o 3 The ball mill tank is installed in the glove box under argon protection throughout the whole process. The mechanical alloying parameters are: ball-to-material ratio, that is, the mass ratio of ball milling medium to material is 10:1, the ball milling medium is stainless steel balls, and the speed is set at 300r / min. Carry out multiple ball milling according to the method of ball milling for four hours a...

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Abstract

The invention relates to a two-step method for preparing high-strength and high-toughness aluminum-containing oxide dispersion-strengthening ferritic steel, and belongs to the field of metal materials. The ferritic steel is prepared from, by weight, 3%-15% of Cr, 0-3% of W, 1%-6% of Al, 0-0.4% of V and 0.25%-0.5% of Y2O3, wherein the contents of C and N are strictly controlled below 0.01 wt.%, andthe oxygen content of atomized powder is controlled below 0.05 wt.%. The method comprises the steps that first, the atomized powder with the particle size of 200-400 mesh and Y2O3 powder with the size of 20-50 nanometers are selected for mechanical alloying; then the prepared mechanical alloying powder and the 400-mesh Al powder are further subjected to secondary mechanical alloying to obtain themechanical alloying powder with the powder size of 30-300 microns; a low-carbon steel ladle is used for packaging the powder, hot isostatic pressing sintering is carried out, the heating rate is controlled below 5 DEG C / min, the pressure is increased to 120 Mpa to 180 Mpa at 600 DEG C, and a two-stage sintering method with heat preservation for three hours at 600-800 DEG C and 1000-1100 DEG C respectively is adopted. The finally obtained nanoparticles of the dispersion strengthened ferritic steel have good toughness and cold deformation processing capability.

Description

technical field [0001] The invention relates to the preparation technology of fourth-generation nuclear reactor cladding and fusion reactor cladding structure materials, in particular to a two-step method for preparing high-strength and high-toughness aluminum-containing oxide dispersion-strengthened ferritic steel. Background technique [0002] The conflict between the growing demand for energy and the reduction of dependence on fossil fuels has drawn more and more attention to advanced nuclear energy systems. Advanced nuclear energy systems require structural materials with excellent properties including high temperature strength, radiation resistance, and corrosion resistance. Ferrite / martensitic oxide dispersion-strengthened steel has high creep strength and excellent radiation resistance. The ability to illuminate is considered as one of the candidate materials for advanced nuclear energy systems. [0003] For ferrite / martensitic oxide dispersion strengthened steel, a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/02C22C38/06C22C38/22C22C38/24
CPCC22C32/0026C22C33/0285C22C38/06C22C38/22C22C38/24
Inventor 周张健徐帅
Owner UNIV OF SCI & TECH BEIJING