Manufacturing method for double-grain-size-distribution oxide dispersion strengthened ferrite steel

A technology of dispersion strengthening and grain size, which is applied in the field of preparation of oxide dispersion strengthened ferritic steel with double grain size distribution, can solve the problems of poor corrosion resistance, deteriorate the mechanical properties of materials, etc., and achieve the improvement of oxidation performance. Effect

Active Publication Date: 2019-04-05
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] For ferrite / martensitic oxide dispersion strengthened steel, one of the major problems restricting its development is relatively poor corrosion resistance
The usual method is to increase the chromium content to improve its oxidation resistance. Increasing the chromium content can improve the oxidation resistance. However, in the long-term service environment, there will be chromium-enriched areas in the material, which will seriously deteriorate the mechanical properties of the material.

Method used

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  • Manufacturing method for double-grain-size-distribution oxide dispersion strengthened ferrite steel
  • Manufacturing method for double-grain-size-distribution oxide dispersion strengthened ferrite steel
  • Manufacturing method for double-grain-size-distribution oxide dispersion strengthened ferrite steel

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Effect test

Embodiment 1

[0029] (1) Prepare 8.5% Cr, 1.2% W, 0.2% V, 6.0% Al, 0.35% Y 2 o 3

[0030] 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;

[0031] (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;

[0032] (3) the standby powder of above-mentioned mechanical alloying and the Y in the step (1) 2 o 3 , Al is placed in a ball mill tank under argon protection throughout the whole process in the glove box. The mechanical alloying parameters are: the ball-to-material ratio is 8:1, the ball mill medium is stainless steel balls, the speed is 300r / min, and the ball mill is cooled for two hours for one hour. Carry out ball milling several times, the ball milling time is 60h, obtain ...

Embodiment 2

[0035] (1) Prepare 9.0% Cr, 1.6% W, 0.2% V, 8.0% Al, 0.35% Y 2 o 3

[0036] 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;

[0037] (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;

[0038](3) the standby powder of above-mentioned mechanical alloying and the Y in the step (1) 2 o 3 , Al is placed in the ball mill tank under the protection of Ar gas in the glove box. The mechanical alloying parameters are: the ball-to-material ratio is 8:1, the ball mill medium is stainless steel balls, the speed is 300r / min, and the ball is milled for two hours and cooled for one hour. Carry out ball milling several times, the ball milling time is 60h, obtain the mechanical...

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Abstract

The invention discloses a manufacturing method for double-grain-size-distribution oxide dispersion strengthening ferrite steel, and belongs to the field of metal materials. The double-grain-size-distribution oxide dispersion strengthening ferrite steel comprises the components of (5-10)wt.% of Cr, (1.5-2)wt.% of W, (6-10.5)wt.% of Al, (0.1-0.4)wt.% of V, (0.25-0.5)wt.% of Y2O3 and less than 0.01wt.% of C and N; the oxygen content of atomization powder is less than 0.05wt.%; the atomization powder with the particle size of 200-400 meshes, Al powder with the particle size of 400 meshes and Y2O3powder with the particle size of 20-50 nanometers are mechanically alloyed; the powders are packed and sealed with a low-carbon steel packing sheathe; hot isostatic pressure sintering is performed; the powders are heated, and pressurization is performed at 800 DEG C; and a two-stage sintering mode is adopted. The tensile strength of the obtained strengthened steel is over 820 MPa, and the total ductility is larger than 16%; the tensile strength at 650 DEG C is not lower than 500 MPa, and the total ductility is not lower than 15%.

Description

technical field [0001] The invention relates to the preparation technology of the fourth generation nuclear reactor cladding and fusion reactor cladding structure materials, in particular to an aluminum-containing oxide dispersion-strengthened ferritic steel with double grain size distribution and excellent corrosion resistance and oxidation resistance. its preparation method. 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] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/15B22F3/10B22F9/04B22F9/08C22C33/02C22C38/06C22C38/22C22C38/24G21C3/07
CPCG21C3/07C22C33/0285C22C38/001C22C38/005C22C38/06C22C38/22C22C38/24B22F3/10B22F3/15B22F9/04B22F9/082B22F2009/0824B22F2009/043Y02E30/30
Inventor 周张健徐帅贾皓东
Owner UNIV OF SCI & TECH BEIJING
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