Chin. Phys. Lett.  2018, Vol. 35 Issue (5): 056102    DOI: 10.1088/0256-307X/35/5/056102
Hardening of an ODS Ferritic Steel after Helium Implantation and Thermal Annealing
Chang-Hao Su1,2, Chong-Hong Zhang1**, Yi-Tao Yang1, Zhao-Nan Ding1, Yu-Guang Chen1,2, Akihiko Kimura3
1Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000
2University of Chinese Academy of Sciences, Beijing 100049
3Institute of Advanced Energy, Kyoto University, Kyoto 611-0011, Japan
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Chang-Hao Su, Chong-Hong Zhang, Yi-Tao Yang et al  2018 Chin. Phys. Lett. 35 056102
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Abstract Specimens of an oxide dispersion strengthened (ODS) ferritic steel (15Cr-4Al-0.6Zr-0.1Ti) are implanted with multiple-energy He ions at room temperature to create a damage plateau of 0.4 dpa for the average (corresponding to an He concentration of about 7000 appm) from the near surface to a depth about 1 μm. The specimen is subsequently thermally annealed at 800$^{\circ}\!$C for 1 h in a vacuum so that simple defects can be formed in the as-implanted state that has undergone significant recombination, meanwhile helium bubbles at nano-scale are formed. Hardness of the specimens are tested with the nano-indentation technique. A hardening by 25% is observed. Microstructures of the specimen after irradiation/annealing are investigated with transmission electron microscopy. Helium bubbles are generally located at dislocations and grain boundaries. Using the dispersed barrier strength model, the strength factor of helium bubbles in the ODS ferritic steel is estimated to be between 0.1 and 0.26, which is close to that of helium bubbles in austenitic steels.
Received: 22 December 2017      Published: 30 April 2018
PACS:  61.80.-x (Physical radiation effects, radiation damage)  
  61.82.Bg (Metals and alloys)  
  81.40.Cd (Solid solution hardening, precipitation hardening, and dispersion hardening; aging)  
  61.72.Ff (Direct observation of dislocations and other defects (etch pits, decoration, electron microscopy, x-ray topography, etc.))  
Fund: Supported by the National Natural Science Foundation of China under Grant No U1532262, and the National Magnetic Confinement Fusion Program of China under Grant No 2011GB108003.
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Chang-Hao Su
Chong-Hong Zhang
Yi-Tao Yang
Zhao-Nan Ding
Yu-Guang Chen
Akihiko Kimura
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