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A kind of fecral-based alloy for accident-resistant nuclear power fuel element and preparation method thereof

A technology for fuel elements and base alloys, which is applied in the field of preparation of FeCrAl-based alloys for accident-resistant nuclear power fuel elements and FeCrAl-based alloys, which can solve the problems that FeCrAl-based alloy materials cannot meet, and achieve excellent high-temperature oxidation performance and high resistance to high-temperature steam Oxidation ability and toughness, effects of increasing recrystallization temperature and high temperature strength

Active Publication Date: 2019-05-21
NUCLEAR POWER INSTITUTE OF CHINA
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  • Abstract
  • Description
  • Claims
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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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  • A kind of fecral-based alloy for accident-resistant nuclear power fuel element and preparation method thereof

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Embodiment 1

[0035] An accident-resistant FeCrAl-based alloy for nuclear power fuel elements, the specific composition of which is shown in Table 1. In Table 1, 1 to 5 are specific proportions of the present invention, and 1# to 3# are specific proportions of alloys for comparison.

[0036] Among them, 1# is a comparative example without adding metal elements such as Ta and V on the basis of 3, 2# is a comparative example of increasing Cr and Al content on the basis of 3, and 3# is a comparative example of reducing Cr and Al on the basis of 3 content comparison.

[0037] Table 1

[0038]

[0039] Adopt the composition in above-mentioned table 1, adopt following method to prepare alloy, concrete preparation method is:

[0040](1) prepare 20-30 kilograms of ingots with industrial pure iron and high-purity alloys with a purity greater than 99.9% according to the formula in Table 1;

[0041] (2) The above ingot is subjected to a high temperature homogenization annealing temperature. Ann...

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Abstract

The invention discloses a FeCrAl-based alloy for accident-resistant nuclear power fuel elements and a preparation method thereof, which solves the problem that the FeCrAl-based alloy materials in the prior art cannot meet the requirements for being suitable for core structures such as fuel element claddings and grids. The problem. The present invention includes 12.5-14.5wt% Cr, 3.5-5.5wt% Al, 1.5-3wt% Mo, 1-3wt% Nb, 0.1-0.3wt% Si, 0.1-0.3wt% Ta, 0.1-0.3wt% V, 0-0.2wt% Ga, 0.1-0.2wt% Ni, 0.05-0.1wt% Ce, C≤0.008wt%, N≤0.005wt%, O≤0.003wt%, and the rest are Fe and unavoidable impurities. The invention has excellent high temperature oxidation resistance, thermal stability, mechanical properties 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-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/06C22C38/02C22C38/44C22C38/48C22C38/46C21D8/00
CPCC21D8/005C22C38/002C22C38/004C22C38/005C22C38/02C22C38/06C22C38/44C22C38/46C22C38/48
Inventor 杜沛南王辉张瑞谦潘钱付刘超红陈勇王晓敏
Owner NUCLEAR POWER INSTITUTE OF CHINA