[2G19-22] 圧力容器鋼2

17:35 〜 17:50

[2G19] Effect of Irradiation Temperature on Mn-Ni-Si Clusters in RPV Model Alloys 03

*陳 心潤¹、Shihua Qiao²、Liang Chen²、Takeshi Toyama³、Koji Inoue³、Bo Li¹、Tatsuya Suzuki⁴、Kenta Murakami¹ (1. The University of Tokyo、2. Shanghai JIAOTONG University、3. Tohoku University、4. Nagaoka University of Technology)

キーワード：

Mn-Ni-Si clusters、reactor pressure vessels、atom probe tomography

Fe-4.6 wt. % Ni-1.7 wt. % Mn-0.7 wt. % Si alloys were irradiated with 2.8 MeV Fe²⁺ ions at temperatures of 573 K, 623 K, 673 K, and 698 K, with a dose of 0.9 dpa and a flux of 10⁻⁴ dpa/s, to investigate the details of the Mn-Ni-Si (MNS) precipitation evolution in the RPV steels. MNS clusters with different chemical proportions were observed by atom probe tomography (APT) at different irradiation temperatures. The reaction of Mn-Ni-Si clusters with dislocation loops and dislocations was observed by transmission electron microscopy (TEM) and scanning transmission electron microscopy energy dispersive spectroscopy (STEM-EDS). These results suggest that the effect of irradiation temperature on MNS cluster evolution may depend on the effect of irradiation temperature on dislocation loop evolution.