Helium-implantation Induced Hardening of Two Low-activation Ferritic/Martensitic Steels of China

FAN Jiaqi; YANG Yitao; DING Zhaonan; LI Caisheng; ZHANG Chonghong; XU Yuping; LUO Guangnan

doi:10.11804/NuclPhysRev.34.02.219

Reduced activation ferritic/martensitic steels (RAFM) are important candidate materials for future fusion nuclear reactors because of their high thermal conductivity, low thermal expansion rate and high resistance to irradiation swelling performance. The influence of high concentration helium produced by nuclear reaction (n,α) on the micro-structure and macro-properties is an important issue limiting the service lifetime of the materials. In the present work, helium implantation to three different doses (100, 1 000, 10 000 appm helium, corresponding to 6×10^-3, 6×10^-2, 6×10^-1 dpa) was carried out to investigate irradiation hardening of two RAFM Steels. Multi-energy He ion-beams at 320 kV high-voltage platform were used to get a damage plateau from surface to 1 μm depth in specimens. The continuous-stiffness test by a Nano-indentor G2000 was carried out Data of nano-hardness were analyzed based on Nix-Gao model. It is shown that there is a 1/2-power law relationship between the hardening and the irradiation damage level. Before helium implantation, the hardness of the CLF steel is slightly lower than that of the CNS steel. However, with the increase of helium-implantation dose, the hardening is more obvious in CLF steel. Further investigation of microstructures is needed to get a deeper understanding of the hardening mechanism.

Helium-implantation Induced Hardening of Two Low-activation Ferritic/Martensitic Steels of China

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

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

3. University of Science and Technology of China, Hefei 230022, China;

4. Institute of Plasma, Chinese Academy of Sciences, Hefei 230031, China

Funds: NSFC-CAS Joint Fund for Research based on Large-scale Scienti c Facilities(U1532262); National Magnetic Con nement Fusion Program(2011GB108003)

Received Date: 2016-03-15

Rev Recd Date: 2016-06-21

Publish Date: 2017-06-20

Key words:

CLF /
CNS /
He-implantation /
hardening /
Nano-indentation

Abstract: Reduced activation ferritic/martensitic steels (RAFM) are important candidate materials for future fusion nuclear reactors because of their high thermal conductivity, low thermal expansion rate and high resistance to irradiation swelling performance. The influence of high concentration helium produced by nuclear reaction (n,α) on the micro-structure and macro-properties is an important issue limiting the service lifetime of the materials. In the present work, helium implantation to three different doses (100, 1 000, 10 000 appm helium, corresponding to 6×10^-3, 6×10^-2, 6×10^-1 dpa) was carried out to investigate irradiation hardening of two RAFM Steels. Multi-energy He ion-beams at 320 kV high-voltage platform were used to get a damage plateau from surface to 1 μm depth in specimens. The continuous-stiffness test by a Nano-indentor G2000 was carried out Data of nano-hardness were analyzed based on Nix-Gao model. It is shown that there is a 1/2-power law relationship between the hardening and the irradiation damage level. Before helium implantation, the hardness of the CLF steel is slightly lower than that of the CNS steel. However, with the increase of helium-implantation dose, the hardening is more obvious in CLF steel. Further investigation of microstructures is needed to get a deeper understanding of the hardening mechanism.

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Reference (17)

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Helium-implantation Induced Hardening of Two Low-activation Ferritic/Martensitic Steels of China

doi: 10.11804/NuclPhysRev.34.02.219

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