Fecral-based alloy material for nuclear reactor cladding and preparation method thereof

Abstract

The invention discloses a FeCrAl-based alloy material for nuclear reactor cladding, which comprises, by weight, Cr: 12.5-14.5%, Al: 3.5-5.5%, Mo: 2-3.5%, Nb: 1-2.5%, Si: 0.1 ~0.5%, Zr: 0~0.5%, Mn: 0~0.05%, La+Ce or La+Y: 0.01~0.1%, the balance is iron and impurities meeting industrial standards. The alloy material of the present invention has excellent high-temperature oxidation performance under the condition of 1000°C water vapor, the alloy has relatively high high-temperature strength and structural thermal stability at 800°C, and has very high mechanical strength and high thermal stability at room temperature Plastic toughness.

Description

technical field [0001] The invention belongs to the technical field of iron-based alloy structural materials and special alloy materials, and in particular relates to a FeCrAl-based alloy material for nuclear reactor cladding used in pressurized water reactors and a preparation method thereof. Background technique [0002] The fuel element is the core component of the nuclear power reactor core, and its performance is directly related to the safety and economy of the nuclear reactor operation. Zirconium alloy is currently the only cladding material used in commercial nuclear power light water reactor fuel elements. However, in emergencies (such as the Fukushima nuclear accident in Japan, the pressurized water reactor loss of water accident, etc.), the zirconium alloy cladding reacts violently with high-temperature coolant water, releasing a large amount of heat and explosive gas hydrogen, resulting in deterioration of the mechanical properties of the cladding material , res...

AI Technical Summary

Problems solved by technology

[0004] At present, most commercially available FeCrAl-based alloy materials have remarkable high-temperature oxidation resistance, but the degree of hardening and embrittlement is serious under thermal aging and irradiation conditions in reactor operating conditions, which brings major safety hazards to reactor operation.

Not only that, the commercial FeCrAl-based alloys have poor mechanical plasticity at room temperature, which makes it difficult to process alloy sheets and thin-walled pipes, and cannot meet the actual needs of industrialization.

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