溶解氢和 IG 碳化铬对合金 600 在氢化原水中氧化行为的影响

IF 2.6 3区 工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY Nuclear Engineering and Technology Pub Date : 2024-08-03 DOI:10.1016/j.net.2024.08.003
Yun Soo Lim, Dong Jin Kim, Sung Woo Kim, Seong Sik Hwang, Sung Hwan Cho, Hong Pyo Kim
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引用次数: 0

摘要

利用分析电子显微镜技术详细描述了合金 600 的内部氧化(IO)和优先晶间氧化(PIO)行为,这取决于氢化原水中的溶解氢(DH)含量和 IG 碳化铬。当 DH 浓度使 Ni 处于 Ni/NiO 平衡附近时,氧化层不稳定,很容易剥离。因此,裸金属的晶界受到侵蚀。发生了 PIO,在氧化的晶界处形成了富铬氧化物,即 CrO。当 DH 浓度使镍处于氧化状态时,会出现 NiO;而当 DH 浓度使镍处于还原状态时,氧化晶界内会出现镍/NiO 平衡。通过消耗渗入晶界的氧气,IG 碳化铬对 PIO 行为产生了强烈影响。IO 层的深度随着 DH 浓度的增加而减小。不同的氧化行为取决于 DH 含量和 IG 碳化铬,相信这将对合金 600 的耐 PWSCC 性能产生重大影响。
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Influence of dissolved hydrogen and IG Cr carbide on the oxidation behavior of Alloy 600 in hydrogenated primary water
The internal oxidation (IO) and preferential intergranular oxidation (PIO) behavior of Alloy 600 depending on the dissolved hydrogen (DH) content and the IG Cr carbide in hydrogenated primary water were characterized in detail using analytical electron microscopy techniques. The oxidation layer was unstable when the DH concentration was such that Ni was in the vicinity of Ni/NiO equilibrium and it could easily be peeled off. Hence, the grain boundaries of the bare metal were attacked. PIO occurred and Cr-rich oxide identified as CrO was formed at the oxidized grain boundary. NiO emerged when the DH concentration was such that Ni was in an oxidizing state, whereas Ni enrichment occurred inside the oxidized grain boundary when the DH concentration was such that Ni was in a reducing state with respective to Ni/NiO equilibrium. The IG Cr carbide strongly affected the PIO behavior by means of the consumption of oxygen penetrating into the grain boundary. The depth of the IO layer decreased as the DH concentration increased. The different oxidation behaviors depending on the DH content and IG Cr carbide are believed to affect the PWSCC resistance of Alloy 600 significantly.
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来源期刊
Nuclear Engineering and Technology
Nuclear Engineering and Technology 工程技术-核科学技术
CiteScore
4.80
自引率
7.40%
发文量
431
审稿时长
3.5 months
期刊介绍: Nuclear Engineering and Technology (NET), an international journal of the Korean Nuclear Society (KNS), publishes peer-reviewed papers on original research, ideas and developments in all areas of the field of nuclear science and technology. NET bimonthly publishes original articles, reviews, and technical notes. The journal is listed in the Science Citation Index Expanded (SCIE) of Thomson Reuters. NET covers all fields for peaceful utilization of nuclear energy and radiation as follows: 1) Reactor Physics 2) Thermal Hydraulics 3) Nuclear Safety 4) Nuclear I&C 5) Nuclear Physics, Fusion, and Laser Technology 6) Nuclear Fuel Cycle and Radioactive Waste Management 7) Nuclear Fuel and Reactor Materials 8) Radiation Application 9) Radiation Protection 10) Nuclear Structural Analysis and Plant Management & Maintenance 11) Nuclear Policy, Economics, and Human Resource Development
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