Embrittlement of an ODS Ferritic Steel Under High-energy Heavy-ion Irradiation

LIU Juan; ZHAGN Chonghong; YANG Yitao; SONG Yin; ZHAGN Liqing; GOU Jie; XIAN Yongqiang; CHEN Jiachao; Jinsung Jang

doi:10.11804/NuclPhysRev.32.03.347

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Article Navigation > Nuclear Physics Review > 2015 > 32(3): 347-352

LIU Juan, ZHAGN Chonghong, YANG Yitao, SONG Yin, ZHAGN Liqing, GOU Jie, XIAN Yongqiang, CHEN Jiachao, Jinsung Jang. Embrittlement of an ODS Ferritic Steel Under High-energy Heavy-ion Irradiation[J]. Nuclear Physics Review, 2015, 32(3): 347-352. doi: 10.11804/NuclPhysRev.32.03.347

Citation:

LIU Juan, ZHAGN Chonghong, YANG Yitao, SONG Yin, ZHAGN Liqing, GOU Jie, XIAN Yongqiang, CHEN Jiachao, Jinsung Jang. Embrittlement of an ODS Ferritic Steel Under High-energy Heavy-ion Irradiation[J]. Nuclear Physics Review, 2015, 32(3): 347-352. doi: 10.11804/NuclPhysRev.32.03.347

Embrittlement of an ODS Ferritic Steel Under High-energy Heavy-ion Irradiation

doi: 10.11804/NuclPhysRev.32.03.347

Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;
University of Chinese Academy of Sciences, Beijing 100049, China;
Paul Scherrer Institute, Villigen PSI 5232, Switzerland;

Received Date: 1900-01-01
Rev Recd Date: 1900-01-01
Publish Date: 2015-09-20

Abstract

Oxide dispersion strengthened (ODS) ferritic steels have better high-temperature creep rupture strength and higher irradiation resistance than conventional ferritic steels, and show high prominence of application in advance nuclear reactors. Their stability under high-dose radiation conditions needs to be clarified. In the present study, a commercial ODS ferritic steel MA956 were irradiated with high 20Ne ions at a terminal chamber of the Sector-focused Cyclotron (SFC) at HIRFL (Heavy-ion Research Facility in Lanzhou). With the energy gradient degrader of the irradiation chamber, the primary energy (123.4 MeV) of the Ne-ion was dispersed into 30 different energies between 38.5~ 121.0 MeV, which resulted in a plateau distribution of lattice damage in the specimens. The specimens were irradiated from both sides so that the whole 60 m thickness was nearly uniformly damaged. The specimen temperature was maintained around 440 ℃ during the irradiation. The irradiation dose is about 9x10¹⁶ ions/cm², corresponding to a damage level of 0.7 dpa and a Ne concentration of 350 appm. The specimens before and after irradiation were tested with the Small-punch Test technique, at room temperature and 500 ℃, respectively. The fracture morphology was observed by scanning electron microscopy.The results show that MA956 underwent some loss of ductility and fracture toughness after the irradiation with high-energy 20Ne ions. It may be ascribed to the formation of nano-scale cavities at the oxides/matrix interfaces
in the ODS steel specimens under irradiation .
- ODS ferritic steel,
- heavy ion,
- irradiation damage,
- ductility,
- fracture toughness
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

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Embrittlement of an ODS Ferritic Steel Under High-energy Heavy-ion Irradiation

doi: 10.11804/NuclPhysRev.32.03.347

Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;

University of Chinese Academy of Sciences, Beijing 100049, China;

Paul Scherrer Institute, Villigen PSI 5232, Switzerland;

Received Date: 1900-01-01
Rev Recd Date: 1900-01-01
Publish Date: 2015-09-20

Key words:

Abstract: Oxide dispersion strengthened (ODS) ferritic steels have better high-temperature creep rupture strength and higher irradiation resistance than conventional ferritic steels, and show high prominence of application in advance nuclear reactors. Their stability under high-dose radiation conditions needs to be clarified. In the present study, a commercial ODS ferritic steel MA956 were irradiated with high 20Ne ions at a terminal chamber of the Sector-focused Cyclotron (SFC) at HIRFL (Heavy-ion Research Facility in Lanzhou). With the energy gradient degrader of the irradiation chamber, the primary energy (123.4 MeV) of the Ne-ion was dispersed into 30 different energies between 38.5~ 121.0 MeV, which resulted in a plateau distribution of lattice damage in the specimens. The specimens were irradiated from both sides so that the whole 60 m thickness was nearly uniformly damaged. The specimen temperature was maintained around 440 ℃ during the irradiation. The irradiation dose is about 9x10¹⁶ ions/cm², corresponding to a damage level of 0.7 dpa and a Ne concentration of 350 appm. The specimens before and after irradiation were tested with the Small-punch Test technique, at room temperature and 500 ℃, respectively. The fracture morphology was observed by scanning electron microscopy.The results show that MA956 underwent some loss of ductility and fracture toughness after the irradiation with high-energy 20Ne ions. It may be ascribed to the formation of nano-scale cavities at the oxides/matrix interfaces
in the ODS steel specimens under irradiation .

Citation:

LIU Juan, ZHAGN Chonghong, YANG Yitao, SONG Yin, ZHAGN Liqing, GOU Jie, XIAN Yongqiang, CHEN Jiachao, Jinsung Jang. Embrittlement of an ODS Ferritic Steel Under High-energy Heavy-ion Irradiation[J]. Nuclear Physics Review, 2015, 32(3): 347-352. doi: 10.11804/NuclPhysRev.32.03.347