FeCrAl-based alloy for accident-resistant nuclear fuel element and preparation method thereof

Abstract

The invention discloses a FeCrAl-based alloy for accident-resistant nuclear fuel element and a preparation method thereof. The problems that a FeCrAl-based alloy material cannot meet the requirement on using of reactor core structural bodies suitable for cladding shells, grillages and the like of fuel elements are solved. The alloy comprises the raw materials in percentage by weight: 12.5 to 14.5 percent of Cr, 3.5 to 5.5 percent of Al, 1.5 to 3 percent of Mo, 1 to 3 percent of Nb, 0.1 to 0.3 percent of Si, 0.1 to 0.3 percent of Ta, 0.1 to 0.3 percent of V, 0 to 0.2 percent of Ga, 0.1 to 0.2 percent of Ni, 0.05 to 0.1 percent of Ce, less than or equal to 0.008 percent of C, less than or equal to 0.005 percent of N, less than or equal to 0.003 percent of O, and the balance of Fe and inevitable impurities. The FeCrAl-based alloy has excellent high-tempreature resistant oxidization performance, heat stability, mechanical performance and the like.

Description

technical field [0001] The invention relates to the technical field of iron-based alloy structural materials and special alloy materials, in particular to a FeCrAl-based alloy for accident-resistant nuclear power fuel elements, and discloses a preparation method of the FeCrAl-based alloy. Background technique [0002] After the Fukushima nuclear accident in Japan, it is required that the fuel element cladding materials for the next generation and future advanced nuclear power water reactors must have better resistance to high-temperature water vapor oxidation, high-temperature strength and High temperature stability, which can provide a greater safety margin and avoid potential core melting accidents, also known as accident-resistant cladding materials. Studies have shown that: FeCrAl-based alloys have good radiation resistance, and the high-temperature oxidation resistance of FeCrAl alloys containing appropriate amounts of Cr, Al, and Si is far superior to that of Zr-2, Zr-...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that none of the FeCrAl-based alloy materials in the prior art can meet the requirements for being suitable for core structures such as fuel element claddings and grids, and the purpose is to provide an accident-resistant nuclear power fuel The FeCrAl-based alloy for components and its preparation method ensure high toughness and high temperature resistance strength while effectively ensuring significant high temperature oxidation resistance

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