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Silicon oxide dispersion strengthening steel and preparation method thereof
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A technology of dispersion strengthening and silicon oxide, which is applied in the field of low-activation radiation-resistant metal materials, can solve the problems of low activation and low elongation, and achieve high elongation, mechanical and radiation-resistant properties.
Active Publication Date: 2018-02-16
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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[0004] Aiming at the problem of low elongation in the existing yttrium oxide dispersion strengthened steel, the purpose of the present invention is to provide a new type of silicon oxide dispersion strengthened steel, which is formed by the dispersion strengthened phase nano-SiO 2 Particles and matrix 8 ~ 20Cr martensitic / ferritic steel composition; In addition, the present invention mainly adopts SiO with low activation characteristics 2 replace Y 2 o 3 As a dispersion strengthening phase, and using SiO 2 The crystal has the characteristics of crystal structure transformation such as quartz, tridymite and cristobalite, and then adjusts the oxide / matrix interface structure through reasonable heat treatment, so as to achieve a significant improvement in its mechanical and radiation resistance properties
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Embodiment 1
[0024] (1) The alloypowder is prepared by the atomization powder making method; wherein, taking the total mass of the alloypowder as 100%, the components and the contents of each component in the alloy powder are as follows: C 0.08%, Cr 9%, W 1.5%, Mn 0.35%, V0.18%, Ta 0.15%, N 0.007%, P≤0.02%, S≤0.01%, S≤0.4%, the balance is Fe;
[0025] (2) SiO with an average particle size of 35nm 2 Add the alloy powder into the ball mill tank, and perform ball milling under an argonatmosphere with a purity of 99.99%, to obtain a mechanically alloyed powder; among them, nano-SiO 2 The mass ratio of the mass and the alloy powder is 1:199, the ball-to-material ratio is 10:1, the ball milling speed is 450r / min, and the ball milling time is 30h;
[0026] (3) After the mechanical alloying powder is moved to the cladding with a degassing port, it is then heated to 500°C and vacuum degassed for 45 minutes until the vacuum degree in the cladding reaches 1×10 -4 When Pa is below, then seal the ...
Embodiment 2
[0033] (1) Prepare alloy powder with a particle size not greater than 150 μm by atomization powder making method; wherein, based on the total mass of the alloy powder as 100%, the components and the content of each component in the alloy powder As follows: C 0.1%, Cr 13%, W1.5%, Mn 0.4%, V 0.2%, Ta 0.15%, N 0.007%, P≤0.02%, S≤0.01%, Ni≤0.4%, the balance is Fe ;
[0034] (2) SiO with an average particle size of 35nm 2 The powder and alloy powder are added to the ball mill tank, and ball milled in an argonatmosphere with a purity of 99.99%, to obtain a mechanically alloyed powder; among them, nano-SiO 2 The mass ratio of the mass and the alloy powder is 2:98, the ball-to-material ratio is 15:1, the ball milling speed is 450r / min, and the ball milling time is 36h;
[0035] (3) After the mechanical alloying powder is moved to the cladding with a degassing port, it is then heated to 500°C and vacuum degassed for 80 minutes until the vacuum degree in the cladding reaches 1×10 -4...
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Abstract
The invention relates to a siliconoxide dispersion strengthening steel and a preparation method thereof, and belongs to the technical field of low-activation and anti-irradiationmetal materials. Thesilicon oxide dispersion strengthening steel is composed of a dispersion strengthening phase nano SiO2 particle and a matrix 8-20 Cr martensite / ferrite steel, the characteristic of conversion of crystal structures such as quartz, scale quartz and square quartz of the SiO2 crystal is mainly used, and the oxide / matrix interface structure is adjusted through reasonable thermal treatment, so that themechanical property and the radiation resistance of the steel can be remarkably improved. In addition, the silicon oxide dispersion strengthening steel is used as first wall structure material of a future fusion reactor and a nuclear fuel cladding material of a fourth-generation fission reactor, thus the safety of the reactor system can be improved, and the power generation efficiency and economical efficiency of the reactor system can be improved.
Description
technical field [0001] The invention relates to a silicon oxide dispersion strengthened steel and a preparation method thereof, belonging to the technical field of low-activation radiation-resistant metal materials. Background technique [0002] Nuclear fusion energy adopts deuterium-tritium fusion reaction. The raw materials are deuterium in seawater and lithium for tritium multiplication. The reserves can be used by human beings for hundreds of millions of years, and it will not produce long-lived radioactive waste. It is a "clean and long-lasting" energy. However, the harsh service environment in future commercial fusion reactors will put forward higher performance requirements for nuclear reactor structural materials. Oxide dispersion strengthened steel is the most potential structural material for future nuclear reactors. [0003] In the existing oxide dispersion strengthened steel, nano-Y 2 o 3 as a particle dispersion strengthening phase. At high temperature, nan...
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