Effect of helium and hydrogen production on irradiation hardening of F82H steel irradiated by ion beams

イオン照射したF82H鋼の照射硬化に及ぼす水素とヘリウム生成の効果

若井 栄一  ; 安堂 正己; 沢井 友次; 大貫 惣明*

Wakai, Eiichi; Ando, Masami; Sawai, Tomotsugu; Onuki, Somei*

F82H鋼の照射硬化に及ぼすヘリウムと水素の効果をTIARAイオン照射実験によって調べた。照射は500Cにて50dpaまで、鉄とヘリウムの2重イオン同時照射又は、鉄とヘリウムと水素の3重イオン同時照射を行った。HeとHの注入比は15appm-He/dpa及び15(150)appm-H/dpaで行った。照射後、微小硬さ測定を行った結果、2重同時照射した試料では、18dpaで材料の軟化が観察され、50dpaで軟化から硬化に特性が転じることがわかった。また、3重イオン照射した試料の硬さは、2重イオン照射した場合より、硬化することがわかった。この効果は水素の量の増加に伴い、促進することがわかった。

Effects of helium and hydrogen production on irradiation hardening of martensitic steel F82H (Fe-8Cr-2W-0.2V-0.04Ta-0.1C) were examined by dual or triple beam experiments. The effects of tempering and cold working were also examined. The irradiations were performed at about 500C to 50 dpa under simultaneous dual beams of 10.5 MeV-Fe and 1.05 MeV-He or triple beams of those and 380keV-H ions. The value of appm-He/dpa for the dual ion beams was about 15, and the values of appm-He/dpa and appm-H/dpa for the triple ion beams were 15 and 15 (or 150), respectively. The hardness of the irradiated specimens measured at room temperature using a micro indentation after the irradiations. Irradiation softening and hardening was observed in F82H-std, F82H+CW and a non-tempered F82H steels irradiated at about 500C to 18 and 50 dpa, respectively, by dual ion beams. The hardness of the specimens irradiated at about 500C to 18 dpa under triple ion beams was harder than that under dual ion beams.