Modeling Swelling Resistance in Reduced Activation ODS Steels based on Quantitative Structure Evaluations

2015 Fiscal Year Final Research Report

• Project/Area Number: 25289338
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Nuclear fusion studies
• Research Institution: Kyoto University
• Principal Investigator: Kimura Akihiko 京都大学, エネルギー理工学研究所, 教授 (90195355)
• Co-Investigator(Kenkyū-buntansha): IWATA Noriyuki 京都大学, エネルギー理工学研究所, 特定助教 (40397534) ; OMURA Takamasa 京都大学, エネルギー理工学研究所, 技術職員 (30506861) ; HASHITOMI Okinobu 京都大学, エネルギー理工学研究所, 技術職員 (80506858)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: ODS鋼 / 耐照射性 / ナノ粒子構造解析

Outline of Final Research Achievements

The effect of recrystallization annealing on the irradiation hardening of Al-added and Al-free ODS steels under the different irradiation conditions.
In Al-free ODS steel, fine grains and oxide particles are remained after annealing at 1400℃, while in Al-added ODS steel, recrystallization occurred and oxide particles are larger after annealing at 1350℃. After the irradiation at 300℃ to 10dpa, irradiation hardening of Al-added ODS steel is larger than that of Al-free ODS steel. The effect of annealing on the irradiation hardening is not significant. According to the Nix-Gao analysis result, the effect of cold rolling after annealing appears to reduce the irradiation hardening. After irradiation at 470℃ to 30dpa, irradiation hardening is observed in the ODS steel, which is a contrast to that conventional steels show no hardening after irradiation at temperatures above 425℃. Recrystallization annealing causes enhancement of swelling.

Free Research Field

原子力材料