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Oxide dispersion strengthening low activity martensitic steel material and preparation thereof
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A technology for dispersion-strengthening and martensitic steel, applied in the field of oxide dispersion-strengthening low-activation martensitic steel materials and their preparation, can solve problems such as low-activation characteristics, and achieve improved power generation efficiency and economy, anti-irradiation and Good high temperature performance
Inactive Publication Date: 2011-01-26
INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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[0006] In view of the fact that the existing oxide dispersion strengthened martensitic steel does not have low activation characteristics, by strictly controlling the content of easily activated elements, an oxide dispersion strengthened low activation martensitic steel material and its preparation method are proposed.
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Embodiment 1
[0023] Powder making: CLAM steel powder with an average particle size of <20-100 μm is prepared by atomization method or mechanical ball milling method.
[0024] The mass fractions of each component of CLAM steel are: Cr 8.5-9.5%, W 1.3-1.7%, V 0.15-0.25%, Ta 0.12-0.18%, Mn 0.40-0.50%, C 0.08-0.12%, The balance is Fe;
[0025] The strict control requirements for the impurity components that can produce long-lived radionuclides after neutron irradiation are: N<0.002%, Ni<0.005%, Mo<0.005%, Nb<0.001%, Co<0.005%, Cu<0.005 %;
[0026] The control requirements for other impurity elements are: ExO<0.01%, P<0.005%, S<0.005%, Al<0.01%.
[0027] Mechanical alloying: three powders (ODS-CLAM steel: Y 2 o 3 0.30%, Ti 0.30%, CLAM steel powder as the matrix) are uniformly mixed and then placed in a stainless steel tank for sealing and vacuum degassing. Then mechanical alloying was carried out in a ball mill, filled with argon for protection, the rotating speed was 220 rpm, and the bal...
Embodiment 2
[0031]In Example 2, compared with Example 1, only the hot-pressing parameters were adjusted, the sintering temperature was increased to 1250° C., and the hot-pressing time was increased to 5 hr.
[0032] Metallographic and scanning electron microscope observations revealed that the pores in the ODS-CLAM steel obtained in Example 2 were less than those in Example 1, and the density was improved. The grain size of the ODS-CLAM steel obtained in the two examples was about 10 μm.
[0033] ODS-CLAM steel belongs to oxide dispersion strengthened low-activation martensitic steel. Compared with CLAM steel, the dispersed distribution of nano-oxides greatly improves the high temperature performance and radiation resistance of the steel. Although the impact toughness and fracture toughness There is a certain degree of decline but it does not affect its use. For example, the yield strength limit and tensile strength between room temperature and 750 ° C are increased by 35% or more compared...
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Abstract
The invention discloses an oxide dispersion strengthened low-activation martensitic steel. A substrate is a CLAM steel and contains 0.2 to 0.5 percent of Y2O3 and 0.10 to 0.50 percent of Ti. The method comprises the following steps that: CLAM steel powder, Y2O3 powder and Ti powder are evenly mixed and put in a sealed container for degassing, subjected to mechanical alloying, hot isostatic pressing or hot-pressing sintering and densification molding under the protection of high-purity argon gas, then subjected to hot squeezing or forging and rolling and other machining and molding processes, and the needed section material is prepared; and finally, the section material is subjected to the treatment of quenching and tempering to prepare the oxide dispersion strengthened low-activation martensitic steel ODS-CLAM. The oxide dispersion strengthened low-activation martensitic steel has the advantages that: the low-activation martensitic steel realizes a martensite-based alloy with oxide strengthening phases evenly dispersed and distributed and crystal grains of a reasonable size, can be used as a structural steel material, has the characteristics of strong neutron irradiation resistance, good high-temperature performance, low activation, etc. and is suitable for a fusion reactor and other environments with strong neutron irradiation and high-temperature.
Description
technical field [0001] The invention relates to an oxide dispersion-strengthened low-activation martensitic steel material suitable for fusion reactors and a preparation method thereof, which has good comprehensive mechanical properties, especially remarkable high-temperature performance, and can resist strong neutron radiation. Also suitable for use in fission reactors. Background technique [0002] Fusion energy is a kind of "clean" nuclear energy, which requires the structural materials used in it to be low-activation materials. At present, the international research on structural materials for fusion reactors mainly focuses on low-activation ferrite / martensitic steel (RAFM steel). Its main feature is to replace elements such as Mo, Nb and Ni in conventional ferritic iron / martensitic steel with W, Ta, V and Mn to ensure its low activation characteristics. It is generally believed that RAFM steel can be used as the structural steel material for the cladding of future fus...
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