Effect of helium concentration on irradiation damage of Fe-ion irradiated SIMP steel at 300 degrees C and 450 degrees C
Effect of helium concentration on irradiation damage of Fe-ion irradiated SIMP steel at 300 degrees C and 450 degrees C
复制标题
氦浓度对铁离子辐照SIMP钢300℃和450℃辐照损伤的影响
DOI：
10.1088/1674-1056/abd6f9
复制
发表时间：
2021
影响因子：
1.7
通讯作者：
Li Bingsheng
中科院分区：
文献类型：
--
作者：
Yang Zhen;Yang Junyuan;Liao Qing;Xu Shuai;Li Bingsheng
SIMP钢是新开发的全马氏体钢，用于铅冷却快堆和加速器驱动系统。高通量中子辐照可通过(n，α)蜕变反应形成致密的He原子，因此评价其抗辐照性能具有重要意义。用Fe和He离子代替中子进行共辐照。样品用6.4 MeV的铁离子辐照，损伤剂量为5dpa，深度为600 nm。在600 nm深度分别进行了3种不同的氦注入比：60appm He/dpa(dpa：每原子的位移)、200 appm He/dpa和600 appm He/dpa。进行了300℃和450℃两种不同的辐照温度。研究了氦浓度对铁辐照SIMP钢组织的影响。用透射电子显微镜观察其微结构损伤。位错环和气泡的形成依赖于氦气注入比和辐照温度。在300℃时，有大量的位错环和氦气泡均匀分布，而在450℃时不均匀分布。
SIMP steel is newly developed fully martensitic steel for lead-cooled fast reactors and accelerator-driven systems. It is important to evaluate its radiation resistance via high flux neutron irradiation, where dense He atoms can be formed via (n, α) transmutation reaction. Co-irradiation with Fe and He ions, instead of neutron, was performed. Specimens were irradiated with 6.4-MeV Fe ions to the damage dose of 5 dpa at a depth of 600 nm. Three different helium injection ratios of 60-appm He/dpa (dpa: displacements per atom), 200-appm He/dpa and 600-appm He/dpa at a depth of 600 nm, were performed. Two different irradiation temperatures of 300 C and 450 C were carried out. The effect of helium concentration on the microstructure of Fe-irradiated SIMP steel was investigated. Microstructural damage was observed using transmission electron microscopy. The formed dislocation loops and bubbles depended on the helium injection ratio and irradiation temperature. Lots of dislocation loops and helium bubbles were homogeneously distributed at 300 C, but not at 450 C. The causes of observed effects are discussed.