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Correlation between tensile property and micro-hardness with its micro-deformation zone in irradiated Ferritic/Martensitic steels

照射された低放射化フェライト鋼の引張特性・微小硬さ変化及びそれに対応した微小変形領域の相関

安堂 正己; 谷川 博康; 若井 栄一; Stoller, R.*

Ando, Masami; Tanigawa, Hiroyasu; Wakai, Eiichi; Stoller, R.*

米国HFIR炉及び高崎TIARAで照射した低放射化フェライト鋼F82Hと熱処理を調整したF82H鋼について生じた照射硬化について比較した。中性子照射材及びイオン照射材の結果から、約573Kで照射されたF82H鋼においてはすべて照射硬化を生じたが、そのうち焼き戻し温度が高めのF82Hについては、照射前後での硬さの値が低く留まることがわかった。一方、中性子照射材の室温引張試験の結果では同様に照射硬化が生じるが、焼き戻し温度の高めのF82Hについては、降伏応力が最も低くなるのに加えて、照射硬化量も少ない傾向にあることがわかった。これらの結果は、以前報告されている溶接材の結果と類似していることから、熱処理によってF82H鋼の照射硬化が低減できることを示すものと考えられる。

The correlation between tensile property and micro-hardness with its micro-deformation zone in neutron/ion irradiated Ferritic/Martensitic steels was examined. The materials were F82H IEA heat and heat treatment variants. The neutron irradiation was performed in HFIR up to 9 dpa at 573 K. The ion-beam irradiation experiment was also carried out at the TIARA facility. Hardness and tensile test were performed at irradiated specimens. Irradiation hardening occurred by neutron/ion irradiation at $$sim$$573 K about F82H IEA and F82H heat treatment variants. The lowest hardness is an over-tempered F82H specimen before/after irradiation. For result of tensile tests, the increase of yield stress in an over-tempered F82H is less than that of F82H IEA. These results are similar to the tensile properties of TIG weldment irradiated at 573 K. This shows that a condition of heat treatment for smaller radiation hardening in F82H steel was obtained in this experiment.

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