High-toughness low-activation FeCrVO multi-principal-element alloy and preparation method thereof

Abstract

The invention relates to the field of nuclear energy structural materials and preparation, and provides a high-toughness low-activation FeCrVO multi-principal-element alloy and a preparation method thereof. The atomic percentage expression of the alloy is FeaCrbVcOd, a is larger than or equal to 20 and smaller than or equal to 35, b is larger than or equal to 20 and smaller than or equal to 35, cis larger than or equal to 20 and smaller than or equal to 35, d is larger than 0 and smaller than or equal to 3, and a + b + c + d = 100. The preparation process comprises the following steps of removing surface oxide skin of raw material Fe, Cr and V, accurately weighing according to a molar ratio, and adding an element O in a form of low-melting-point V2O5; and smelting a target alloy in a non-consumable vacuum arc furnace or a vacuum magnetic suspension smelting furnace, and obtaining the alloy through a vacuum suction casting or casting method. According to the preparation method, the strength and compression plasticity of the low-activation FeCrV multi-principal-element alloy are remarkably improved innovatively through adding the element O, and the comprehensive tensile property ofthe low-activation FeCrV multi-principal-element alloy is remarkably superior to that of an existing low-activation multi-principal-element alloy; and the alloy has high strength, high toughness, highthermal stability and excellent radiation resistance, and has an application prospect in the field of structural materials for nuclear energy.

Description

Technical field [0001] The invention relates to the field of structural materials for nuclear energy and their preparation technology, and in particular to a high-strength, tough, low-activation FeCrVO multi-principal alloy and its preparation method. Background technique [0002] The development of safe and efficient advanced nuclear energy systems is a major strategic need of the country. The radiation resistance of nuclear structural materials is one of the key factors affecting the safety and economy of nuclear energy reactors, especially the operating environment of fourth-generation reactors and fusion reactors. The complex and harsh service environment with high neutron radiation dose and high temperature puts forward more stringent performance requirements for structural materials used in nuclear energy. To this end, the material is first required to have low activation characteristics, is not easy to activate after neutron irradiation, and has low residual radioacti...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, aiming at the service environment of advanced reactors and fusion reactor structural materials, the advantages of multi-principal alloys in the ability to resist radiation defects, select low-activation alloys, and provide a single-phase BCC At the same time, aiming at the problem of poor toughness of BCC structure multi-principal alloys, innovatively use O element to strengthen the BCC structure low-activation FeCrV multi-principal alloy gold system, and through the melting process, not Limited to arc melting and vacuum magnetic levitation melting processes, FeCrVO-based multi-principal solid solution alloys with high strength, toughness and low activation are prepared

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