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

A technology of nano-oxide and low-activation steel, which is applied in the field of metal material processing, and can solve the problems of difficulty in preparing large and complex components, high efficiency, and low cost

Active Publication Date: 2021-07-30
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 as well as preparation method and application thereof
  • Nano oxide and carbide dispersion strengthened low-activation steel as well as preparation method and application thereof
  • Nano oxide and carbide dispersion strengthened low-activation steel as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0034] Step 1, mechanically stirring the alloy steel powder and the nanometer oxide powder in a mixer to obtain a mixed powder. Specifically, alloy steel powder is composed of (WFe75% 200g, Cr 900g, TiFe30% 66.7g, SiFe75% 17.8g, MnFe75% 71.1g, Fe281.9g) and nano-diyttrium trioxide 37.5g are mixed under mechanical stirring , to obtain a mixed powder. Wherein, the stirring time is 5 hours; 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; Stable Rare Earth Y 2 o3 , the average particle size is less than 40nm; the mass of oxide powder in the mixed powder accounts for 0.5% of the total content.

[0035] Step 2, wrapping the mixed powder with a steel strip, and forming a flux-cored welding wire through wire drawing...

Embodiment 2

[0042] The main difference between this example and Example 1 is that the composition of the composite metal powder is different, and its main chemical composition and mass percentage are shown in Table 2.

[0043] Table 2 embodiment 2 composite metal powder composition (wt %)

[0044] C Cr W mn Ti Si Y 2 o 3

Embodiment 3

[0046] The main difference between this example and Example 1 is that the composition of the composite metal powder is different, and its main chemical composition and mass percentage are shown in Table 3.

[0047] Table 3 embodiment 3 composite metal powder composition (wt %)

[0048] 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

[0049] image 3 It is the SEM figure of the dispersion strengthened low activation steel material prepared by embodiment 1, wherein image 3 (a) is the SEM image under low power microscope and image 3 (b) is the SEM picture of the SEM photo under high magnification;

[0050] Depend on image 3 It can be seen that for the nano-ODS and MX strengthened low-activation steel piece prepared in Example 1 of the present application, there are fine oxides and MX precipitated inside the alloy structure at room temperature.

[0051] Figure 4 is the STEM figure of the dispersion strengthened ...

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Abstract

The invention belongs to the technical field of metal material processing, and particularly relates to nano oxide and carbide dispersion strengthened low-activation steel as well as a preparation method and application thereof. The preparation method comprises the following steps that (1) alloy steel powder and nano oxide powder are uniformly mixed to obtain composite metal powder; (2) the composite metal powder is wrapped with a steel belt, and a flux-cored wire is obtained through a forming wire drawing technology; and (3) the flux-cored wire serves as a raw material, additive manufacturing is conducted through electric arc fuse wire additive manufacturing equipment, and the low-activation steel can be obtained. According to the layer-by-layer deposition principle, the metal wire is molten through electric arc heat, under the control of a software program, the needed metal component is gradually formed from line to face to body, a mold is not needed, the efficiency is high, the cost is low, and the method has unique advantages in manufacturing of large complex metal components and has wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to nanometer oxide and carbide dispersion strengthened low-activation steel, its preparation method and application. Background technique [0002] Low activation steel, steel parts with low thermal expansion rate, low transmutation, low radiation swelling and other low activation characteristics, are generally considered to be It is the preferred structural material for future nuclear fusion reactors and commercial nuclear fusion power plants. Nanostructured oxide dispersion strengthened (ODS) and intragranular precipitated nano-MX (M=Ti, X=C) phase strengthened low-activation steel as a new generation of nuclear reactor cladding materials has attracted extensive attention and research internationally. However, during the service process, there is an obvious positive correlation between the structural stability of the material and the service performan...

Claims

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Application Information

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Patent Type & Authority Applications(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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