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Preparation of Oxide Dispersion Strengthened Ferritic Steel by Surface Oxidation + Explosive Compaction

A technology of dispersion strengthening and ferritic steel, which is applied in the field of oxide dispersion strengthening steel, can solve the problems of high cost, low output, uneven distribution of oxides, etc., and achieve the effect of low cost, simple operation and increasing the number of oxides

Active Publication Date: 2021-02-09
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of low output and high cost caused by mechanical alloying and hot isostatic pressing process in the preparation of existing nano-oxide dispersion strengthened steel, and the uneven distribution of oxides caused by oxidation method, the invention provides a surface oxidation and explosive pressure The method of preparing nano-oxide dispersion-strengthened steel combined with reality can improve efficiency, save costs and realize the preparation of large-scale components while ensuring the formation of nano-oxide dispersion-strengthened phase

Method used

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  • Preparation of Oxide Dispersion Strengthened Ferritic Steel by Surface Oxidation + Explosive Compaction
  • Preparation of Oxide Dispersion Strengthened Ferritic Steel by Surface Oxidation + Explosive Compaction
  • Preparation of Oxide Dispersion Strengthened Ferritic Steel by Surface Oxidation + Explosive Compaction

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A nanocomposite oxide dispersion-strengthened FeCr alloy is prepared, and the alloy composition is Fe-9Cr-0.3Ti-1.5W-0.2V-0.6Mn-0.5Y (mass percentage, the same below).

[0032] A 100kg vacuum induction furnace was used to melt the alloy ingot, and then argon gas spraying was used to make powder to obtain the iron-based alloy powder of the above composition. Screen the powder with a particle size of about 60 μm, put it in the quartz tube, turn on the molecular pump to extract the air inside the device, then slowly feed pure oxygen into the quartz tube, and at the same time adjust the gas fine-tuning valve and vacuum pump valve to control the iron in the quartz tube. The oxygen pressure in contact with the base alloy powder is 50Pa, and then the powder is heated to 325°C at a heating rate of 5°C / min, oxidized at a constant temperature for 24 hours, and then sealed and packaged. figure 1 It is the oxygen element distribution diagram of the iron-based alloy powder profile a...

Embodiment 2

[0034] Prepare nanocomposite oxide dispersion strengthened Fe-Cr-Al ferritic steel, the alloy composition is Fe-15Cr-4.5Al-0.5Ti-2.0W-0.1Si-0.1Y (mass percentage, the same below).

[0035] The alloy ingot was melted in a 50 kg vacuum induction furnace, and argon spray was used to prepare the above iron-based alloy powder containing Y. Screen out the powder with a particle size of 60-100um, put the powder in the quartz tube, turn on the molecular pump to extract the air inside the device, then oxidize the powder, vacuumize the powder in the quartz tube, and adjust the gas fine-tuning valve and The vacuum pump valve controls the oxygen pressure in contact with the iron-based powder to 20Pa, then heats the powder to 300°C at a heating rate of 5°C / min, and determines the constant temperature oxidation time to be 6h according to the Y content of the alloy powder. After oxidation, a continuous oxide film is formed on the surface of the powder, and the thickness of the oxide film is ab...

Embodiment 3

[0037] A nanocomposite oxide dispersion-strengthened Fe-Cr-Al ferrite alloy is prepared, and the alloy composition is Fe-14Cr-4Al-0.5Ti-2.0W-0.5Y.

[0038] The alloy ingot was smelted in a 50 kg vacuum induction furnace, and the iron-based alloy powder of the above components was obtained by argon spraying. Screen the powder with a particle size of 60-100 μm, put it in a quartz tube, turn on the molecular pump to extract the air inside the device, and then oxidize the powder at a heating rate of 5°C / min, oxygen pressure of 20Pa, and raise the temperature to 350°C. Seal the package after constant temperature for 30h. After oxidation, a continuous oxide film is formed on the surface of the powder, and the thickness of the oxide film is about 18.5nm. Before explosive compaction, the powder needs to be pre-compressed in the press, and the load applied by the press is 80 tons, and then the oxidized powder is placed in the explosive compaction mold, and the powder-to-drug ratio is ...

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Abstract

The invention provides a method for preparing a novel oxide dispersion strengthened ferritic steel, comprising: surface oxidation of atomized powder to obtain oxygen-containing powder, explosive compaction of oxygen-containing powder to realize powder molding, and finally compacting the compact in Heat treatment at a certain temperature promotes the decomposition of the oxide film and the formation of nano-oxide disperse phases, thereby obtaining ferritic steel with uniform distribution of disperse phases. Compared with mechanical alloying and hot isostatic pressing, surface oxidation and explosive compaction are relatively cheap methods, which can greatly shorten the preparation time and improve efficiency, and provide the possibility for large-scale preparation of ODS steel. At the same time, the preparation of oxide dispersion strengthened ferritic steel sheets, bars and even pipes can be realized through the explosive compaction process, and the preparation level can reach hundreds of kilograms or even tons.

Description

technical field [0001] The invention relates to oxide dispersion-strengthened steel, and specifically provides a novel preparation method that improves preparation efficiency, reduces cost, and can mass-produce nanometer oxide dispersion-strengthened ferritic steel. Background technique [0002] Nanoscale oxide dispersion-strengthened ferritic steel is uniformly distributed with extremely high-density nanoscale precipitates. These nanoscale precipitates can serve as sites for capturing point defects generated by irradiation and He produced by nuclear reactions, making point defects and He is evenly distributed in the material matrix in the form of extremely fine point defect clusters and He bubbles, which can effectively reduce the radiation swelling effect and He brittleness. In addition, the ultra-high-density oxide dispersion-strengthened phase has excellent high-temperature stability, which can effectively pin dislocations and grain boundaries, thereby significantly impr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/02C22C38/04C22C38/22C22C38/24C22C38/28B22F3/08C22C32/00
CPCB22F3/08C22C32/0026C22C33/0285C22C38/005C22C38/04C22C38/22C22C38/24C22C38/28
Inventor 刘实闫福照熊良银李静王永利
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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