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Preparation method of superfine grain nano-structure oxide dispersion strengthened steel

A nano-structure and dispersion strengthening technology is used in the preparation of radiation-resistant alloys, the core components of nuclear reactors are used in the fields of high temperature resistance and high strength, which can solve the problems of structural and performance anisotropy, long time, coarse grains, etc. The effect of shortening time, suppressing growth, and lowering sintering temperature

Inactive Publication Date: 2011-05-25
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The solidification process currently used is hot isostatic pressing or hot extrusion. The former requires a long time for high-temperature solidification and the grains are relatively coarse; the latter solidification time is shorter and the grains are smaller than the former, but there are significant structures and Problem of property anisotropy, requiring complicated post-thermomechanical / recrystallization processing

Method used

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  • Preparation method of superfine grain nano-structure oxide dispersion strengthened steel
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Using high-purity metal element powder, each component is 9.0% by mass percentage Cr, W is 1.0%, Mn is 0.4%, V is 0.4%, Ta is 0.4%, and the balance is Fe, and the mass percentage is 0.3%. Ti powder, 0.3% Y 2 o 3 Powders are mixed and milled by high energy ball to form Y 2 o 3 Supersaturated alloy powder with complete solid solution with Ti, the particle size of the powder is on the order of microns, and the grain size is on the order of tens of nanometers. After discharge plasma sintering in a vacuum environment, the sintering temperature is 1000°C, the sintering time is 3min, and the sintering pressure is 40MPa. After solidification and molding, the crystal structure of the alloy is martensite, and the density is 98.1% of the theoretical density. The strength is 1204MPa, and the size of most grains is between 100 and 300 nanometers, see figure 1 , figure 2 shown.

Embodiment 2

[0019] Using high-purity metal element powder, each component is 16.0% by mass percentage Cr, 4.0% W, and the balance is Fe, and the mass percentage is 3% Ti powder, 3% Y 2 o 3 The powder is mixed and milled by high energy ball to form Y 2 o 3 Supersaturated alloy powder with complete solid solution with Ti, the particle size of the powder is on the order of microns, and the grain size is on the order of tens of nanometers. After discharge plasma sintering in an Ar gas environment, the sintering temperature is 800°C, the sintering time is 15min, and the sintering pressure is 200MPa. After solidification, the crystal structure of the alloy is ferrite, the density reaches 98.2% of the theoretical density, and the tensile strength at room temperature reaches 1158MPa. . The size of most of the grains is between 150-350nm.

Embodiment 3

[0021] Using atomized alloy powder, each component of the alloy is 12.0% by mass percentage Cr, 2.0% W, 1.0% Mn, 1.0% V, 1.0% Ta, the balance is Fe, and 0.1% Ti by mass percentage , 0.1% of Y 2 o 3 Mixed and high energy ball milled to form Y 2 o 3 Supersaturated alloy powder with complete solid solution with Ti, the particle size of the powder is on the order of microns, and the grain size is on the order of tens of nanometers. After discharge plasma sintering in an Ar gas environment, the sintering temperature is 1200°C, the sintering time is 1min, and the sintering pressure is 10MPa. After solidification, the crystal structure of the alloy is a ferrite / martensite dual-phase structure, and the density reaches 98.0% of the theoretical density. , The tensile strength at room temperature reaches 1047MPa. The size of most grains is between 200 and 500 nanometers.

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Abstract

The invention discloses a preparation method of superfine grain nano-structure oxide dispersion strengthened steel. The preparation method comprises the following steps of: performing ball-milling mechanical alloying on alloy powder which is prepared by an atomization method or pure metal element powder in a corresponding constituent element ratio, metal Ti powder and Y2O3 powder in a nanometer scale in vacuum or under Ar gas protection so as to form solid solution alloy powder which is rich in supersaturated Y, Ti and O; and putting the supersaturated solid solution alloy powder into a mould, and performing solidification sintering in spark plasma sintering equipment so as to obtain the superfine grain nano-structure oxide dispersion strengthened steel, wherein sintering environment can be vacuum or inert gas; a sintering temperature is between 800 and 1,200 DEG C; heat preserving time is between 1 and 15min; and pressure is between 10 and 200MPa. The grain size of the alloy is refined from a micron level to a level which is equal to or less than 500 nanometers by the method, the characteristic microstructure and the irradiation resistance performance of the nano-structure oxide dispersion strengthened steel are maintained, and the alloy strength and the high temperature creep strength are greatly improved, so that the using requirement of core parts of an advanced nuclear reactor on the high temperature resistance and the irradiation resistance of materials are met.

Description

technical field [0001] The invention discloses a preparation method of ultrafine grain nanostructure oxide dispersion strengthened steel, which relates to the preparation technology of high-temperature-resistant, high-strength, and radiation-resistant alloys for core components of nuclear reactors. Background technique [0002] The current development direction of nuclear power is thermal reactor (pressurized water reactor) - fast neutron reactor (fourth generation reactor) - fusion reactor. However, the operating temperature and radiation intensity of advanced nuclear reactors (including fourth-generation reactors and fusion reactors) are much higher than those of the existing second-generation / third-generation fission reactors. A consensus has been formed: Although there are many difficult technical problems to be solved, the development of advanced reactors will depend on the development of high-performance new structural materials, that is, materials are the main bottlen...

Claims

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Application Information

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