[2G19-22] Reactor Pressure Vessel Steel 2

5:35 PM - 5:50 PM JST(8:35 AM - 8:50 AM UTC)

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

*Xinrun Chen¹, Shihua Qiao², Liang Chen², Takeshi Toyama³, Koji Inoue³, Bo Li¹, Suzuki Suzuki⁴, Kenta Murakami¹ (1. The University of Tokyo, 2. Shanghai JIAOTONG University, 3. Tohoku University, 4. Nagaoka University of Technology)

Keywords:

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.