Corrosion rate of parent and weld materials of F82H and JPCA steels under LBE flow with active oxygen control at 450 and 500 C

酸素濃度制御された450Cと500Cの流動鉛ビスマス中におけるF82H鋼とJPCA鋼母材と溶接材の腐食速度

菊地 賢司; 鎌田 勤也*; 小野 幹訓*; 北野 照明*; 林 健一*; 大井川 宏之 

Kikuchi, Kenji; Kamata, Kinya*; Ono, Mikinori*; Kitano, Teruaki*; Hayashi, Kenichi*; Oigawa, Hiroyuki

F82HとJPCAの腐食特性を流動鉛ビスマスループ中で調べた。材料は日本のADSビーム窓候補材であり、電子溶接部も含む。高温部の試験温度は最高450と500度で低温部との温度差は100度である。主流の流速は毎秒0.4から0.6mであり、酸素濃度は2から410mass%に制御した。試験片は丸棒型である。試験後、光学,SEM,X線解析,X線回折により腐食被膜の特性を調べた。その結果、ADSのビーム窓を設計する場合の腐食速度は時間に対して線形則が推奨されるという結論を得た。

Corrosion behavior of F82H and JPCA was studied in the circulating LBE loop. Those are candidate materials of Japanese ADS beam windows. Maximum temperatures were kept to 450 and 500 C with 100 C constant temperature difference. Main flow velocity was 0.4 to 0.6 m/s in every case. Oxygen concentration was controlled to 2410 mass% although there was an exception. Testing time durations were 500 to 3000 hrs. Round bar type specimens were put in the circular tube of the loop. Electron beam welded joint in the middle part of specimens were also studied. Optical micrograph, electron micrograph, X-ray element analyses and X-ray diffraction were investigated. Consequently for a long-term behavior a linear law is recommended to predict corrosion in the ADS beam design.