2022 Fiscal Year Final Research Report
Development of a novel multi-directional thermomechanical process to optimize the microstructure of Oxide-Dispersion-Strengthened (ODS) ferritic steel
| Project/Area Number |
20K14445
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 14020:Nuclear fusion-related
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| Research Institution | National Institute for Fusion Science |
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Principal Investigator |
Shen Jingjie 核融合科学研究所, ヘリカル研究部, 助教 (80824747)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | ODS steel / Cold rolling / Thermal annealing / Recrystallization / Mechanical properties / Ion irradiation / Irradiation hardening |
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| Outline of Final Research Achievements |
In this study, a novel thermomechanical process, namely, multi-directional cold rolling followed by thermal annealing, was developed to reduce the recrystallization temperature of oxide-dispersion-strengthened (ODS) steel. This recrystallization process can improve the ductility and creep properties. To investigate the irradiation resistance, ion irradiation experiments were carried out. Results showed that cold rolling can suppress the irradiation hardening by inducing large numbers of defects (dislocations, grain boundaries, etc.). Irradiation hardening of recrystallized samples at room temperature and 673 K was due to the formation of irradiation defects, however, hardening at 973 K was not obviously observed.
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| Free Research Field |
Fusion Reactor Materials Science
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| Academic Significance and Societal Importance of the Research Achievements |
A novel recrystallization process was developed to give rise to a lower recrystallization temperature, homogeneous microstructure, fewer pore defects in matrix, and thus improvements of ductility, creep properties, and formability, which are critical for the fabrication and application of ODS steel.
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