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Preparation of oxide dispersion strengthened ferrite steel by surface oxidation and explosive compaction

A technology of dispersion strengthening and ferritic steel, applied in the field of oxide dispersion strengthening steel, can solve the problems of uneven distribution of oxides, high cost, low yield, etc., and achieve the effect of increasing nucleation rate, low cost and uniform structure

Active Publication Date: 2019-10-18
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 ferrite steel by surface oxidation and explosive compaction
  • Preparation of oxide dispersion strengthened ferrite steel by surface oxidation and explosive compaction
  • Preparation of oxide dispersion strengthened ferrite steel by surface oxidation and explosive compaction

Examples

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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. After 30 hours of constant temperature, it is sealed and packaged. 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-...

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Abstract

The invention provides a preparation method of novel oxide dispersion strengthened ferrite steel. The preparation method comprises the following steps: carrying out surface oxidation on pulverized powder to obtain oxygen-containing powder; carrying out explosive compaction on the oxygen-containing powder to form the powder; and finally, carrying out thermal treatment on a pressed shape at a certain temperature to promote decomposition of an oxidizing film and generate nano oxide dispersed phases so as to obtain the ferrite steel with uniformly distributed dispersed phases. The surface oxidation and explosive compaction methods are relatively cheap compared with mechanical alloying and hot isostatic pressing, the preparation time can be shortened greatly, the efficiency is improved, and itis probable to prepare ODS steel on a large scale. Meanwhile, oxide dispersion strengthened ferrite steel panels, bars and even tubular products can be prepared by an explosive compaction process, andthe preparation grade of the oxide dispersion strengthened ferrite steel panels, bars and even tubular products can be quintal or even tonnage.

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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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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