Nanometer structure oxide dispersion strengthening vanadium alloy and preparation method thereof

Abstract

The invention discloses a nanometer structure oxide dispersion strengthening vanadium alloy and a preparation method thereof. Components of the alloy comprise, by mass part, 3.9%-4.1% of Cr, 3.9%-4.1%of Ti, 0.05%-5% of Zr, 0.1%-4% of Y and the balance V and inevitable impurity. V base, V-Cr base and V-Cr-Ti base alloy powder, or pure metal element powder is used for being mixed with metal Zr powder and YH2 powder; ball milling is carried out after mixing, the ratio of balls to materials is 5:1-10:1, the rotating speed of a ball milling machine is 200-260 turns per minute, the diameter of themilling balls is 5-10 mm, and ball milling time is 50-60 h; solid solution alloy powder obtained after ball milling is subjected to solidifying sintering, the sintering temperature is 950-1450 DEG C,heat preserving time is 1-15 min, and sintering pressure is 10-100 MPa; and the sintered alloy is subjected to vacuum annealing for 0.5-2 h on the vacuum condition at the temperature of 1050-1200 DEGC, and the oxide dispersion strengthening vanadium alloy is obtained.

Description

technical field [0001] The invention relates to a preparation method of a vanadium alloy, in particular to a preparation technology of a high-temperature-resistant, high-strength, radiation-resistant nanostructure nanostructure ODS vanadium alloy used for nuclear reactor core components. Background technique [0002] With economic development and population growth, the non-renewable characteristics of fossil fuels and the environmental pollution problems they bring force us to look for a clean and renewable energy source, and the use of nuclear reactions to obtain energy is an important measure to solve the world's energy crisis. There are two types of nuclear reactions: fission and fusion. Compared with fission, nuclear fusion releases more energy, is rich in fuel, and does not produce long-lived high-radioactive waste (tritium is radioactive but has a half-life of only 12.3 years). Therefore, from the perspective of long-term development, nuclear fusion energy will be an i...

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Problems solved by technology

[0008] The invention patent with application number 201210078491.2 discloses a Ti 3 SiC 2 Dispersion strengthened V-4Cr-4Ti alloy, the room temperature tensile strength of this dispersion strengthened vanadium alloy is ≥600MPa, and the elongation is ≥10%, but the addition of Ti 3 SiC 2 The size of the nano-precipitated phase in the dispersion strengthened vanadium alloy is 50-100nm, and the size of the nano-precipitated phase is larger, which will seriously affect the high-temperature strength and radiation resistance of the alloy.

[0009] H.Kurishita et al. published in "Materials Science and Engineering" A433 (2006) 32-38 "Development of fine-grained V-28Cr-2.3Y and V-52Cr-1.8Y alloys with superior mechanical properties" found that, The oxide dispersion strengthened V-Cr-Y alloy grain size prepared by hot isostatic pressing method can be refined to 0.27μm, and the dispersion distribution in the alloy is 7-43nm rich in Y 2 o 3 , YN and Y precipitates, and their performance data confirm that the refinement of grain and precipitate size can greatly improve the strength of nanostructured oxide dispersion-type strengthened vanadium alloys, but the stability of this nano-precipitate is poor. During the annealing temperature > 1200°C, these Y-rich precipitates will dissolve into the matrix, resulting in a decrease in the strength and radiation resistance of the alloy

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