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Effect of two-steps heat treatments on irradiation hardening in F82H irradiated at 573 K

537Kで照射されたF82Hにおける照射硬化に対する2段熱処理の影響

安堂 正己; 谷川 博康; 若井 栄一; Stoller, R. E.*

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

573K付近の照射で生じる低放射化フェライト鋼の照射硬化挙動を明らかにするために、熱処理条件を変化させたF82H鋼を準備し、中性子照射・イオン照射によって生じた照射硬化についての比較を行った。その結果、573Kで照射されたF82H鋼ではすべての材料について照射硬化を生じたが、焼き戻し温度が高めの条件のF82H鋼では、照射前後の硬さ値が最も低い結果となった。中性子照射材の引張試験の結果では、同様に降伏応力が最も低くなるのに加えて、硬化量($$Delta$$YS)も低減する傾向にあることがわかった。これらの結果から、熱処理条件によって照射硬化量が低減できる可能性があることが明らかとなった。

Radiation hardening and embrittlement due to neutron irradiation around 573 K are the important issues on RAF/M steels. It is expected that the improvement of radiation hardening might be one of effective ways to control the mechanical properties after irradiation. The purposes of this study are to find the condition of heat treatment for minimum of radiation hardening in F82H steel using Neutron/Ion-irradiation and to examine a correlation between tensile property and micro-hardness before/after irradiation. Neutron irradiation was performed in HFIR up to 9 dpa. Ion-irradiation at $$sim$$573 K was carried out at the TIARA facility of JAEA. For the results of tensile test and hardness test of F82H and F82H heat treatment variants neutron-irradiated at 573 K, all specimens caused radiation hardening. The radiation hardening ($$Delta$$H) obtained by hardness test is almost same level, however radiation hardening ($$Delta$$YS) of F82H heat treatment variants is smaller than that of F82H.

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パーセンタイル:28.36

分野:Materials Science, Multidisciplinary

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