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A kind of Fecral-based alloy material for nuclear reactor core and preparation method thereof
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A technology for nuclear reactors and base alloys, which is applied in the field of FeCrAl-based alloy materials for nuclear reactor cores and its preparation, can solve the problems of poor thermal stability of alloy structures, reduce Cr and Al content, and poor mechanical plasticity at room temperature, etc., to improve mechanical properties, The effects of high high temperature strength and room temperature toughness, good high temperature oxidation performance and corrosion resistance
Active Publication Date: 2019-07-05
NUCLEAR POWER INSTITUTE OF CHINA
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[0006] The object of the present invention is to: provide a kind of FeCrAl-based alloy material for nuclear reactor core, add Mo, Nb, W, Ta, Zr micro-alloying element of specific proportion in matrix, and reduce the content of Cr, Al, solve the existing problem Commercial FeCrAl-based alloy materials have serious hardening and embrittlement under thermal failure and irradiation conditions in reactor operating conditions, poor mechanical plasticity at room temperature, and poor thermal stability of the alloy structure.
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Embodiment 1
[0045] A FeCrAl-based alloy material for a nuclear reactor core is composed of the following components by weight percentage,
[0046] Cr: 12.7%, Al: 4.5%, Mo: 1.9%, W: 0.1%, Nb: 1.0%, Ta: 0.1%, Zr: 0.10%, Ga: 0.1%, Mn: 0.1%, Ce: 0.05%, C: 0.008%, N: 0.005%, O: 0.003%, the balance is Fe and impurities, wherein the impurities meet the requirements of commercial industrial pure iron, the total weight percentage of Cr and Al alloy elements is 17.2%, Mo, Nb, The total weight percentage sum of W, Ta and Zr is 3.2%, and the ratio of the sum of Cr and Al alloy elements to the sum of Mo, Nb and Ta alloy elements is 5.4.
Embodiment 2
[0048] A FeCrAl-based alloy material for a nuclear reactor core is composed of the following components by weight percentage,
[0049] Cr: 14.5%, Al: 5.5%, Mo: 1.5%, W: 0.2%, Nb: 2.0%, Ta: 0.15%, Zr: 0.05%, Ga: 0.2%, Mn: 0.1%, Ce: 0.01%, C: 0.008%, N: 0.005%, O: 0.003%, the balance is Fe and impurities, wherein the impurities meet the requirements of commercial industrial pure iron, the total weight percentage of Cr and Al alloy elements is 20%, Mo, Nb, The total weight percentage sum of W, Ta and Zr is 3.9%, and the ratio of the sum of Cr and Al alloy elements to the sum of Mo, Nb, W, Ta and Zr alloy elements is 5.1.
Embodiment 3
[0051] A FeCrAl-based alloy material for a nuclear reactor core is composed of the following components by weight percentage,
[0052] Cr: 13.1%, Al: 3.9%, Mo: 1.7%, W: 0.1%, Nb: 2.5%, Ta: 0.12%, Zr: 0.08%, Ga: 0.2%, Mn: 0.1%, Ce: 0.05%, C: 0.008%, N: 0.005%, O: 0.003%, the balance is Fe and impurities, wherein the impurities meet the requirements of commercial industrial pure iron, the total weight percentage of Cr and Al alloy elements is 17%, Mo, Nb, The total weight percent sum of W, Ta, Zr alloy elements is 4.5%, and the ratio of the sum of Cr, Al alloy elements to the sum of Mo, Nb, W, Ta, Zr alloy elements is 3.8.
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Abstract
The invention discloses a FeCrAl-based alloy material for a nuclear reactor core and a preparation method thereof. It is composed of the following components in terms of weight percentage, Cr, Al, Mo, Nb, W, Ta, Zr, Ga, Mn, Ce, C, N, O, Fe, impurities, wherein the total weight percentage of Cr, Al alloying elements is greater than or equal to 17%, and the total weight percentage of Cr alloying elements is greater than or equal to 12.7%, Mo, Nb, W, Ta, The total weight percentage content of Zr alloy elements is greater than or equal to 3.1%, and the sum of the total weight percentages of Mo and W alloy elements is less than or equal to 2.0%. The interaction between alloying elements in the FeCrAl-based alloy has excellent high-temperature water vaporoxidation resistance and radiation performance, high high-temperature strength and tissue thermal stability at a high temperature of 800 ° C, and relatively high temperature resistance at room temperature. High mechanical strength and plasticity suitable for processing.
Description
technical field [0001] The invention belongs to the technical field of iron-based alloy structural materials and special alloy materials, and specifically refers to a FeCrAl-based alloy material for a nuclear reactor core 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 powerlight 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 , resulting in nuclear catastrophic conseque...
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