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

doi:10.1088/1674-1056/abd6f9

中国物理B ›› 2021, Vol. 30 ›› Issue (5): 56107-056107.doi: 10.1088/1674-1056/abd6f9

所属专题： SPECIAL TOPIC — Ion beam modification of materials and applications

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

Zhen Yang(杨振)^1,†, Junyuan Yang(杨浚源)², Qing Liao(廖庆)², Shuai Xu(徐帅)², and Bingsheng Li(李炳生)^2,‡

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

收稿日期:2020-11-08 修回日期:2020-12-16 接受日期:2020-12-28 出版日期:2021-05-14 发布日期:2021-05-14
通讯作者: Zhen Yang, Bingsheng Li E-mail:yangzh97@mail.sysu.edu.cn;libingshengmvp@163.com
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. U1832133 and 12075194), Sichuan Provial Science and Technology Program, China (Grant No. 2020ZYD055), and the Doctor Research Foundation of Southwest University of Science and Technology (Grant No. 18zx714101).

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

Zhen Yang(杨振)^1,†, Junyuan Yang(杨浚源)², Qing Liao(廖庆)², Shuai Xu(徐帅)², and Bingsheng Li(李炳生)^2,‡

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

Received:2020-11-08 Revised:2020-12-16 Accepted:2020-12-28 Online:2021-05-14 Published:2021-05-14
Contact: Zhen Yang, Bingsheng Li E-mail:yangzh97@mail.sysu.edu.cn;libingshengmvp@163.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. U1832133 and 12075194), Sichuan Provial Science and Technology Program, China (Grant No. 2020ZYD055), and the Doctor Research Foundation of Southwest University of Science and Technology (Grant No. 18zx714101).

摘要/Abstract

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 °C, but not at 450 °C. The causes of observed effects are discussed.

关键词: martensitic steels, Fe and He co-irradiation, microstructure, transmission electron microscopy

Abstract: 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 °C, but not at 450 °C. The causes of observed effects are discussed.

Key words: martensitic steels, Fe and He co-irradiation, microstructure, transmission electron microscopy

中图分类号: (Physical radiation effects, radiation damage)

61.80.-x

61.80.Jh (Ion radiation effects) 68.37.Lp (Transmission electron microscopy (TEM)) 78.40.Kc (Metals, semimetals, and alloys)

Zhen Yang(杨振), Junyuan Yang(杨浚源), Qing Liao(廖庆), Shuai Xu(徐帅), and Bingsheng Li(李炳生). Effect of helium concentration on irradiation damage of Fe-ion irradiated SIMP steel at 300 ℃ and 450 ℃[J]. 中国物理B, 2021, 30(5): 56107-056107.

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

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

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