Efficient preparation method for nanostructure oxide dispersion strengthening steel

A technology of dispersion strengthening and nanostructure, which is applied in the field of efficient preparation of nanostructured oxide dispersion strengthened steel, can solve the problems that affect the successful preparation of nanostructured oxide dispersion strengthened steel, performance deterioration, low efficiency, etc., and achieve the suppression of non-nanostructure and the formation of harmful precipitated phases, improving the overall performance and reducing the cost of preparation

Active Publication Date: 2013-03-27
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Since repeated dislocation cutting is required to achieve Y 2 o 3 The solid solution of Y and O contained in the alloy requires dozens to more than one hundred hours of long-term mechanical alloying ball milling. In addition to low efficiency and high cost, the pollution that occurs during the ball milling process (including the introduction process) cannot be avoided. Too much oxygen and pollution from tanks and ball mills), too much o

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of nanostructured oxide dispersion strengthened martensitic steel, the alloy composition is (the number before the alloy element is the mass percentage, the same below) Fe-9Cr-1W-0.3Ti-0.3Y-0.1Al-0.2OTa.

[0029] According to the mass ratio, the alloy constituent elements other than Y and Ti are used as raw materials, put into the induction furnace of the atomization equipment, and evacuated to a vacuum degree of 8.8×10 -2 Pa, then filled with ultra-high purity H with a purity of 99.9999% 2 to 0.03MPa, heat and turn on the electromagnetic stirring until the alloy raw materials are completely melted, then add Y and Ti to the melt, and then evacuate to 9.3×10 -2 Pa, followed by atomization and pulverization. Argon is used as the atomizing gas, the atomizing pressure is 6.1 MPa, the flow rate of the alloy liquid is 0.3 kg / s, and the average particle size of the atomized alloy powder is ~110 μm. The atomized alloy powder is detected by X-diffraction, showing o...

Embodiment 2

[0031] The nanostructured oxide dispersion strengthened martensitic steel was prepared, and the alloy composition was Fe-8Cr-2W-0.9Ti-0.4Y-0.1Al-0.2Ta-0.1V-0.1Mn-0.1C.

[0032] According to the mass ratio, the alloy constituent elements other than Y and Ti are used as raw materials, put into the induction furnace of the atomization equipment, and evacuated to a vacuum degree of 8.9×10 -2 Pa, then filled with ultra-high purity H with a purity of 99.9999% 2 to 0.03MPa, heat and turn on the electromagnetic stirring until the alloy raw materials are completely melted, then add Y and Ti to the melt, and then evacuate to 9.9×10 -2 Pa, followed by atomization and pulverization. The atomization gas is argon, the atomization pressure is 6.5MPa, the flow rate of the alloy liquid is 0.32kg / s, and the average particle size of the atomized alloy powder is ~103μm. The atomized alloy powder is detected by X-diffraction, which shows that the alloy elements including Y and Ti are all solid s...

Embodiment 3

[0034] A nanostructured oxide dispersion strengthened martensite / ferrite dual phase steel was prepared, and the alloy composition was Fe-12Cr-2W-0.3Ti-0.8Y-4Al-0.3V-0.1Ta-0.4Mn-0.1N.

[0035] According to the mass ratio, the alloy constituent elements other than Y and Ti are used as raw materials, put into the induction furnace of the atomization equipment, and evacuated to a vacuum degree of 9.7×10 -2 Pa, then filled with ultra-high purity H with a purity of 99.9999% 2 to 0.03MPa, heat and turn on the electromagnetic stirring until the alloy raw materials are completely melted, then add Y and Ti to the melt, and then vacuum again to 9.7×10 -2 Pa, followed by atomization and pulverization. The atomization uses argon gas, the atomization pressure is 6.0MPa, the flow rate of the alloy liquid is 0.33kg / s, and the average particle size of the atomized alloy powder is ~110μm. The atomized alloy powder is detected by X-diffraction, which shows that all alloy elements including Y a...

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PUM

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Abstract

The invention aims at providing an efficient preparation method for nanostructure oxide dispersion strengthening steel, which adopts an atomization method for direct preparation(for one step) of powder solid solution alloy containing supersaturation solid solution of Y and Ti, so that conventional process for long-time mechanical alloying ball-milling between mother alloy(free of Y and Ti) atomization powder process as well as atomized powder and Y2O3 and Ti is replaced, and necessary microstructure is provided for forming high density nanostructure rich Y-Ti-O precipitated phase in follow-up process. According to the method, the preparation process is simplified, and bad microstructures such as non-nanostructure precipitated phase and the like and degradation of material property caused by long-time ball milling in existing process can be controlled or prevented, the obdurability and radiation resistance and helium fragility resistance of the material can be improved, so that the operation requirement of key structure material of core parts on advanced nuclear reactor is satisfied.

Description

technical field [0001] The invention relates to the preparation technology of high-temperature-resistant, high-strength, and radiation-resistant alloys for core components of fourth-generation nuclear reactors (fast reactors), and in particular provides an efficient preparation method for nanostructured oxide dispersion-strengthened steel. Background technique [0002] my country has determined the "three-step" nuclear power development strategy from thermal neutron reactor (pressurized water reactor) to fast neutron reactor (fourth generation nuclear reactor) to fusion reactor. Fast reactors can make full use of U-238, which cannot be used by thermal reactors and accounts for the vast majority of uranium resources, through fast neutron technology and the corresponding closed cycle of nuclear fuel, so that the utilization rate of uranium resources can be increased by 60 times, and the volume and toxicity of nuclear waste can be reduced by 10. It is estimated that commercial ...

Claims

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Application Information

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IPC IPC(8): C22C38/28C22C33/02
Inventor 吕铮刘春明谢锐
Owner NORTHEASTERN UNIV
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