Estimation on Nodular Corrosion Resistance of LWR Cladding by Magnetic Method

磁法评估轻水堆堆焊层的抗球蚀能力

• 批准号: 01880026
• 负责人: MIYAKE Chie
• 金额: $ 3.2万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B).
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01880026/
• 关键词: Zircaloy Cladding; Zircaloy-4; Nb-Zircaloy; Nodular Corrosion; Superparamagnetic State; Magnetization Curve; Beta-quench; Intermetallic Compound; 磁化典線; βー処理; 微量添加元素; ジルカロイー2

Although the beta-phase has been reported to be a supersaturated solid solution with additives, such as iron, chromium, nickel, and so forth, we have found that Zircaloy-4 after beta-quench is in a superparamagnetic state which contains ferromagnetic intermetallic precipitates so small a few nm that they can not be detected by usual methods. In the case of Zircaloy-2, the phase may be a similar state to Zircaloy-4, but can not be called a superparamagnetic state because of the nonmagnetism of the responsible precipitates.Zircaloy with additive of niobium was also found to be in a superparamagnetic state caused by the precipitates with about 10nm in diameter of ferromagnetic intermetallic compounds. The intermetallic compounds are a quaternary (Zr_<1-x>Nb_x) (Fe_<1-y>Cr_y)_2 as well as (Zr_<1-x>Nb_x) Fe_2 and Zr (Fe_<1-x>Cr_x)_2.Finally, the out of pile corrosion test was performed on the samples of Zircaloy-4, which were heat-treated under the various conditions, such as quenching or furnace-cooling from the temperatures in the temperature range of beta-phase and beta-phase plus alpha-phase of Zirconium. It was found that beta-quench materials of Zircaloy-4 which is in the superparamagnetic state have a corrosion resistant property for "nodular corrosion".

虽然有报道称β相是含有铁、铬、镍等添加剂的过饱和固溶体，但我们发现β淬火后的Zircaloy-4处于超平磁状态，其中含有小至几纳米的铁磁性金属间相，用常规方法无法检测到。在Zircaloy-2的情况下，相可能是类似于Zircaloy-4的状态，但不能称为超顺磁状态，因为所负责的沉淀是非磁性的。添加铌的锆合金也处于超顺磁状态，这是由直径约10nm的铁磁性金属间化合物析出引起的。金属间化合物为（Zr_<1-x>Nb_x） （Fe_<1-y>Cr_y）_2、（Zr_<1-x>Nb_x） Fe_2和Zr (Fe_<1-x>Cr_x)_2。最后，在锆的β相和β相+ α相温度范围内对锆-4试样进行了淬火或炉冷等不同热处理条件下的桩外腐蚀试验。研究发现，超顺磁状态下的锆-4 β -淬火材料具有“结核腐蚀”的耐腐蚀性能。

项目成果

Chie Miyake and Kunihiro Gotoh: "Magnetic Study of Zircaloy (II) Zircaloy with Additive of Niobium" Journal of Nuclear Materials. (1991)

Chie Miyake 和 Kunihiro Gotoh：“含有铌添加剂的锆合金 (II) 的磁性研究”核材料杂志。

Chie Miyake: "Magnetic Study of Zircaloy (II) Zircaloy with Additive of Niobium" Journal of Nuclear Materials. (1991)

Chie Miyake：“含铌添加剂的锆合金 (II) 的磁性研究”核材料杂志。

Chie Miyake: "Magnetic Study of Zircaloy 'Zirconium in the Nuclear Industry' : 8th Int. Symp." ASTM STP 1023, L. E. P. Van Swam and C. M. Eucken, Eds.487-497 (1989)

Chie Miyake：“Zircaloy‘核工业中的锆’的磁性研究：第八届国际症状。”

Chie Miyake and Toshito Takamiya: "Magnetic Study of Zircaloy" Zirconium in the Nuclear Industry:Eighth International Symposium,ASTM STP 1023,L.F.P.Van Swam and C.M.Eucken,Eds.(American Society for Testing and Materials,Philadelphia). 478 (1989)

Chie Miyake 和 Toshito Takamiya：“锆合金的磁性研究”核工业中的锆：第八届国际研讨会，ASTM STP 1023，L.F.P.Van Swam 和 C.M.Eucken，Eds.（美国测试与材料学会，费城）。

Chie Miyake,Toshito Takamiya: "Magnetic Study of Zircaloy" Zirconium in the Nuclear Industry Eds:L.F.P.Van-Swan and C.M.Eucken ASTM STP. 1023. 487 (1989)

Chie Miyake、Toshito Takamiya：“锆合金的磁性研究”核工业中的锆编辑：L.F.P.Van-Swan 和 C.M.Eucken ASTM STP。