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Heat treatment effect on fracture toughness of F82H irradiated at HFIR

中性子照射されたF82H鋼の破壊靭性における熱処理効果

大久保 成彰; Sokolov, M. A.*; 谷川 博康; 廣瀬 貴規; 實川 資朗; 沢井 友次; Odette, G. R.*; Stoller, R. E.*

Okubo, Nariaki; Sokolov, M. A.*; Tanigawa, Hiroyasu; Hirose, Takanori; Jitsukawa, Shiro; Sawai, Tomotsugu; Odette, G. R.*; Stoller, R. E.*

熱処理条件及び微量添加元素を変化させた低放射化フェライト鋼F82Hの照射硬化及び破壊靭性について調べた。試料は、標準材であるF82H-IEA材,IEA材に各種熱処理を加えたMod1シリーズ及びF82Hにタンタルを0.1%添加したMod3材である。これらの試料をHFIR炉で300$$^{circ}$$Cにて約18dpaまで照射した。照射後の硬さ試験の結果、Mod3材の照射硬化はIEA材と同程度であった。また、Mod1シリーズは、熱処理条件によって照射硬化が比較的抑えられる傾向を示した。破壊靭性試験から求めたMod3材の脆性遷移温度は、IEA材に比べて低く、室温付近であった。また、Mod1材も同様に室温付近であった。以上の結果から、熱処理条件の絞込み及び微量添加元素の調整が、照射後の遷移温度上昇の抑制に効果的であることが明らかになった。

Irradiation hardening and fracture toughness of reduced-activation ferritic/martensitic steel F82H after irradiation were investigated with a focus on changing the fracture toughness transition temperature as a result of several heat treatments. The specimens were standard F82H-IEA (IEA), F82H-IEA with several heat treatments (Mod1 series) and a higher tantalum containing (0.1%) heat of F82H (Mod3). The specimens were irradiated up to 18 dpa at 300 $$^{circ}$$C in High Flux Isotope Reactor under a collaborative research program between JAEA/US-DOE. The results of hardness tests showed that irradiation hardening of IEA was comparable with that of Mod3. However, the fracture toughness transition temperature of Mod3 was lower than that of IEA. The transition temperature of Mod1 was also lower than that of the IEA heat. These results suggest that tightening of specifications on the heat treatment condition and modification of the minor alloying elements seem to be effective to reduce the fracture toughness transition temperature after irradiation.

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パーセンタイル:39.29

分野:Materials Science, Multidisciplinary

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