Carbon Contamination, Its Consequences and Its Mitigation in Ion-Simulation of Neutron-Induced Swelling of Structural Metals
Carbon Contamination, Its Consequences and Its Mitigation in Ion-Simulation of Neutron-Induced Swelling of Structural Metals
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中子引起的结构金属膨胀的离子模拟中的碳污染、其后果及其缓解措施
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
M. Toloczko
中科院分区：
文献类型：
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作者：
L. Shao;J. Gigax;Hyosim Kim;F. Garner;Jing Wang;M. Toloczko
奥氏体和铁素体钢中的中子诱发膨胀对钢中的碳水平及其在基体或沉淀物中的分布敏感。它最近已成为已知的，离子辐照到高dpa水平导致一个渐进的离子束诱导的碳浓度和沉淀的离子范围内的增加，同时减少空隙膨胀。这种非典型的中子现象危及轻水反应堆应用的离子模拟的可靠性。进行了一系列涉及纯铁和结构合金HT9的实验，以确定注入碳的来源和分布。有人发现，带负电荷的碳原子被夹带在自离子束的库仑阻力效应，从而提供在低漂移能量的照射表面，然后通过离子束混合和扩散。开发了一种用于过滤污染物，特别是碳，氧和氮的技术，并导致比不过滤更高，更中子相关的溶胀水平。
Neutron-induced swelling in austenitic and ferritic steels is sensitive to the carbon level in the steel, as well as its distribution in matrix or precipitates. It has recently become known that ion-irradiation to high dpa levels leads to a progressive ion-beam-induced increase in carbon concentration and precipitation within the ion range, with concurrent reductions in void swelling. This neutron-atypical phenomenon imperils the credibility of ion simulation for light water reactor applications. A series of experiments involving pure iron and a structural alloy HT9, were conducted to identify the source and distribution of injected carbon. It was found that negatively-charged carbon atoms are entrained in the self-ion beam by a Coulomb drag effect, and thereby delivered at low drift energy to the irradiated surface, followed by ion-beam-mixing and diffusion. A technique for filtering out contaminants, especially carbon, oxygen and nitrogen, was developed and resulted in higher, more neutron-relevant swelling levels than achieved without filtering.