[2G07-10] Blanket Materials

[2G08] Phase stability of long-term creep tested F82H

*Hiroyasu TANIGAWA Tanigawa¹, Motoki Nakajima¹, Masami Ando¹, Taichiro Kato¹, Hideo Sakasegawa², Toshiya Nakata³, Takashi Nozawa¹ (1. QST, 2. JAEA, 3. Gifu Univ.)

Keywords:RAFM steel, Long-term creep, Phase stability

The creep test campaign for Reduced activation ferritic/martensitic (RAFM) steel F82H IEA heat was initiated around 1997, and the world’s longest creep test on RAFM steel, over 20 years, was completed with creep fracture times of 176019.5 hours (20.1 years) at 226 MPa/500 ℃ and 213475.0 hours (24.4 years) at 26.5 MPa /650 ℃. In this study, detailed microstructure analyses concerning phase stability, especially the stability of precipitates, were carried out on the gage and grip section of fractured specimens of F82H after long-term creep testing. The phase stability of crept F82H was compared with that observed in aged and irradiated F82H.