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Oxide dispersion strengthened ferrite/martensitic steel and preparation method thereof

A technology of dispersion strengthening and martensitic steel, which is applied in the field of oxide dispersion strengthening ferrite/martensitic steel and its preparation, can solve the problems of high requirements in the preparation and packaging process, phase transformation of encased samples, etc., and achieve enhanced resistance Corrosion ability, reducing oxygen content, and ensuring the effect of creep strength

Active Publication Date: 2017-01-04
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For powder samples, the use of a sheath is an important part of its sealing and packaging. Now metal sheaths are usually used, but the requirements for its preparation and packaging process are relatively high, and due to the large amount of heat generated during the welding and sealing process, it is difficult for Samples in envelopes create phase transition issues

Method used

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  • Oxide dispersion strengthened ferrite/martensitic steel and preparation method thereof
  • Oxide dispersion strengthened ferrite/martensitic steel and preparation method thereof
  • Oxide dispersion strengthened ferrite/martensitic steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Prepare 8.5%Cr, 1.2%W, 0.2%V, 0.2%Mn, 3.5%Al, 0.5%Zr, 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 0.1%, and the rest is Fe, and the above are mass percentages;

[0027] (2) will divide Y 2 o 3 All elements except , Zr, Al, etc. are prepared by Ar gas atomization method according to the mass percentage in step (1), the oxygen content is controlled below 0.04wt.%, and the particles with a particle size of 50-200 mesh are screened as mechanical powders. alloying spare powder;

[0028] (3) Combine the above mechanically alloyed spare powder with Y in step (1) 2 o 3 , Zr, and Al are installed in the ball mill tank under the protection of Ar gas in the whole process in the hand box. The mechanical alloying parameters are: the ball-material ratio is 6:1, the ball mill medium is stainless steel balls, the speed is 300r / min, and the ball mill is cooled for 1 hour for 4 hours. Ball milling was carried out several time...

Embodiment 2

[0031] (1) Prepare 9%Cr, 1.8%W, 0.3%V, 0.2%Mn, 4.5%Al, 0.2%Hf, 0.4%Y 2 o 3 , the purity of the above raw materials is 99.9%, the content of C and N is less than 0.1%, and the rest is Fe, and the above are mass percentages;

[0032] (2) will divide Y 2 o 3 All elements except , Hf, Al, etc. are prepared by Ar gas atomization method according to the mass percentage in step (1), the oxygen content is controlled below 0.035wt.%, and the particles with a particle size of 50-200 mesh are screened as mechanical powders. alloying spare powder;

[0033] (3) Combine the above mechanically alloyed spare powder with Y in step (1) 2 o 3 , Hf, and Al are installed in the hand box under the protection of Ar gas throughout the whole process. The mechanical alloying parameters are: the ball-to-material ratio is 8:1, the ball-milling medium is stainless steel balls, the speed is 330r / min, and the ball mill is cooled for 1 hour for 2 hours Ball milling was carried out several times in hour...

Embodiment 3

[0036] (1) Prepare 10%Cr, 1.5%W, 0.2%V, 0.3%Mn, 5%Al, 0.3%Zr, 0.2%Hf, 0.45%Y 2 o 3 , the purity of the above raw materials is 99.9%, the content of C and N is less than 0.1%, and the rest is Fe, and the above are mass percentages;

[0037] (2) will divide Y 2 o 3 All elements except , Hf, Al, etc. are prepared by Ar gas atomization method according to the mass percentage in step (1), the oxygen content is controlled below 0.04wt.%, and the particles with a particle size of 50-200 mesh are screened as mechanical powders. alloying spare powder;

[0038] (3) Combine the above mechanically alloyed spare powder with Y in step (1) 2 o 3 , Zr, Hf, and Al are placed in the ball mill tank under the protection of Ar gas in the whole process in the hand-held box. The mechanical alloying parameters are: the ball-to-material ratio is 7:1, the ball-milling medium is stainless steel balls, and the speed is 380r / min. The method of cooling for 1 hour was carried out multiple times for ba...

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Abstract

The invention relates to oxide-dispersion-strengthening ferrite / martensitic steel with the excellent high-temperature strength and the good oxidation resistance and a preparing method of the oxide-dispersion-strengthening ferrite / martensitic steel. The oxide-dispersion-strengthening ferrite / martensitic steel comprises 8% to 10% of Cr, 0.5% to 2% of W, 1.5% to 5.5% of Al, 0.1% to 0.4% of V, 0.1% to 0.5% of Mn, 0% to 1.0% of Zr, 0% to 1.0% of Hf and 0.25% to 0.5% of Y2O3. The content of C and the content of N are controlled to be lower than 0.1%, and at least one kind of the Hf and the Zr is contained; the oxygen content of atomized powder is controlled to be lower than 0.05 wt.%, the atomized powder with the particle size ranging from 50 meshes to 200 meshes is selected to be mechanically alloyed with Al powder, Zr powder, Hf powder and Y2O3 powder, and the size of obtained powder ranges from 90 micrometers to 200 micrometers; silicate glass is used for wrapping, compressing and molding, the pressure is started to be boosted to 120 MPa to 180 MPa at the temperature of 850 DEG C, a two-stage sintering manner in which the temperature ranging from 850 DEG C to 950 DEG C is kept for 1 hour and the temperature ranging from 1050 DEG C to 1150 DEG C is kept for 1 hour is adopted, the tensile strength of the finally-obtained ferrite / martensitic steel at the temperature of 700 DEG C ranges from 250 MPa to 320 MPa, and the ductility of the finally-obtained ferrite / martensitic steel at the temperature of 700 DEG C ranges from 18% to 32%; and the oxidation performance of the dispersion-strengthening steel is also greatly improved on the premise that the high-temperature strength and the high-temperature plasticity are guaranteed, and after 100-h oxidation is carried out at the temperature of 850 DEG C, the oxidation weight increase only ranges from 0.0327 mg / cm<3> to 0.098 mg / cm<3>.

Description

technical field [0001] The invention relates to the technical field of preparation of key structural materials for the first wall of the fourth-generation nuclear reactor, in particular to an aluminum-containing oxide dispersion-strengthened ferrite / martensitic steel with excellent high-temperature strength and good corrosion resistance and oxidation resistance and 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/28C22C33/02
Inventor 周张健张广明
Owner UNIV OF SCI & TECH BEIJING
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