Nano-oxide and carbide dispersion-strengthened low-activation steel and preparation method and application

A nano-oxide and dispersion strengthening technology, applied in the field of metal material processing, can solve the problems of low cost, difficulty in preparing large and complex components, and high efficiency, and achieve the effects of low cost, inhibition of aggregation and growth, and high efficiency

Active Publication Date: 2022-07-12
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for preparing dispersion-strengthened low-activation steel, the purpose of which is to melt the metal wire with arc heat according to the layer-by-layer deposition principle, and under the control of the software program, The required metal components are gradually formed from line-surface-body, without molds, high efficiency and low cost, especially in the manufacture of large and complex metal components. It has unique advantages and solves the problem that traditional powder metallurgy methods are difficult to prepare large and complex components.

Method used

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  • Nano-oxide and carbide dispersion-strengthened low-activation steel and preparation method and application
  • Nano-oxide and carbide dispersion-strengthened low-activation steel and preparation method and application
  • Nano-oxide and carbide dispersion-strengthened low-activation steel and preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A preparation method of dispersion strengthened low activation steel, such as figure 1 shown, including the following steps:

[0034] In step 1, the alloy steel powder and nano-oxide powder are mechanically stirred by a mixer to obtain a mixed powder.

[0035]Specifically, the alloy steel powder was composed of (WFe75% 200g, Cr 900g, TiFe30% 66.7g, SiFe75% 17.8g, MnFe75% 71.1g, Fe 281.9g) and nanometer yttrium trioxide 37.5g were mixed under mechanical stirring , to obtain mixed powder. Wherein, the stirring time is 5h; the alloy steel powder is stainless steel powder or other special-purpose alloy steel powder, the average particle size is less than 100 μm, and the wire drawing formability is good; the nano-oxide powder is high melting point, high Stable Rare Earth Y 2 O 3 , and its average particle size is less than 40 nm; the mass of oxide powder in the mixed powder accounts for 0.5% of the total content.

[0036] In step 2, the mixed powder is wrapped with a st...

Embodiment 2

[0043] The main difference between this example and Example 1 is that the composition of the composite metal powder is different, and the composition and mass percentage of its main chemical components are shown in Table 2.

[0044] Table 2 embodiment 2 composite metal powder composition (wt%)

[0045] C Cr W Mn Ti Si Y 2 O 3

Embodiment 3

[0047] The main difference between this example and Example 1 is that the composition of the composite metal powder is different, and the composition and mass percentage of its main chemical components are shown in Table 3.

[0048] Table 3 embodiment 3 composite metal powder composition (wt%)

[0049] C Cr W Mn Ti Si Y 2 O 3

Fe 0.064 9.0 1.5 0.8 0.5 0.2 0.2 margin

[0050] image 3 is the SEM image of the dispersion-strengthened low-activation steel material prepared in Example 1, wherein image 3 (a) is the SEM image under low magnification and image 3 (b) in the middle is the SEM image of the SEM photo under high magnification;

[0051] Depend on image 3 It can be seen that the nano-ODS and MX-strengthened low-activation steel parts prepared in Example 1 of the present application have fine oxides and MX precipitated inside the alloy structure at room temperature.

[0052] Figure 4 is the STEM image of the dispersion-stren...

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Abstract

The invention belongs to the technical field of metal material processing, and in particular relates to nano-oxide and carbide dispersion-strengthened low-activation steel and a preparation method and application. The preparation method of the present invention includes the following steps: (1) mixing the alloy steel powder and the nano-oxide powder uniformly to obtain a composite metal powder; (2) wrapping the composite metal powder with a steel strip, and obtaining a drug core by forming and drawing technology welding wire; (3) using the flux-cored welding wire as a raw material, and using arc fuse additive manufacturing equipment for additive manufacturing, low activation steel can be obtained. According to the principle of layer-by-layer deposition, the invention uses arc heat to melt the metal wire, and under the control of the software program, the required metal components are gradually formed from the line-surface-body, without the need for molds, with high efficiency and low cost, especially in the manufacture of large and complex Metal components have unique advantages and broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to nano-oxide and carbide dispersion-strengthened low-activation steel and a preparation method and application thereof. Background technique [0002] Low activation steel, steel with low activation characteristics such as low thermal expansion rate, low transmutation, and low irradiation swelling, is generally considered to be due to its good resistance to neutron irradiation, low activation characteristics and relatively mature industrial technology foundation. It is the preferred structural material for future nuclear fusion reactors and commercial nuclear fusion power plants. Nanostructured oxide dispersion strengthened (ODS) and intragranular precipitation of nanometer MX (M=Ti, X=C) phase-strengthened low-activation steel as a new generation of nuclear reactor cladding materials have attracted extensive international attention and research. Howev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/02C22C38/02C22C38/04C22C38/22C22C38/28B33Y70/10
CPCC22C33/0285C22C33/0235C22C33/006C22C38/02C22C38/04C22C38/22C22C38/28B33Y70/10Y02P10/25Y02E30/10
Inventor 严有为周亚举易果强尹圣铭薛丽红余圣甫张鹏
Owner HUAZHONG UNIV OF SCI & TECH
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