Effect of helium concentration on irradiation damage of Fe-ion irradiated SIMP steel at 300℃and 450℃  

作　　者：Zhen Yang Junyuan Yang Qing Liao Shuai Xu Bingsheng Li 杨振;杨浚源;廖庆;徐帅;李炳生(Sino-French Institute of Nuclear Engineering and Technology,Sun Yat-sen University,Zhuhai 519082,China;State Key Laboratory for Environment-Friendly Energy Materials,Southwest University of Science and Technology,Mianyang 621010,China)

机构地区：[1]Sino-French Institute of Nuclear Engineering and Technology,Sun Yat-sen University,Zhuhai 519082,China [2]State Key Laboratory for Environment-Friendly Energy Materials,Southwest University of Science and Technology,Mianyang 621010,China

出　　处：《Chinese Physics B》2021年第5期81-86,共6页中国物理B（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.U1832133 and 12075194);Sichuan Provial Science and Technology Program,China(Grant No.2020ZYD055);the Doctor Research Foundation of Southwest University of Science and Technology(Grant No.18zx714101).

摘　　要：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℃and 450℃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℃,but not at 450℃.The causes of observed effects are discussed.

关 键 词：martensitic steels Fe and He co-irradiation microstructure transmission electron microscopy 

分 类 号：TG142.24[一般工业技术—材料科学与工程] TL34[金属学及工艺—金属材料] TL50[金属学及工艺—金属学]