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Tensile properties on dissimilar welds between 11Cr-ferritic/martensitic steel and 316 stainless steel after thermal aging

11Crフェライト/マルテンサイト鋼と316鋼の異材溶接部の熱時効後の引張特性

矢野 康英 ; 丹野 敬嗣 ; 岡 弘  ; 関尾 佳弘 ; 大塚 智史 ; 皆藤 威二 ; 舘 義昭  

Yano, Yasuhide; Tanno, Takashi; Oka, Hiroshi; Sekio, Yoshihiro; Otsuka, Satoshi; Kaito, Takeji; Tachi, Yoshiaki

高速炉用に開発された11Cr-フェライト/マルテンサイト鋼(PNC-FMS)とSUS316鋼との異材溶接部について、30000時間までの熱時効試験を実施し、熱時効の影響を評価した。硬さ測定, 継手引張, 溶金部のミニチュア引張試験による強度試験と透過型電子顕微鏡を用いた組織解析を実施し、両者の相関評価を実施した。その結果、異材溶接継手は全ての温度で健全であることを示し、低温での熱時効硬化に及ぼす組織因子としてCr-リッチ相の形成が大きいことを明らかにした。

Ferritic/martensitic (F/M) steels are expected to be used not only for the long-life core material of fast reactors, but also for the blanket materials of fusion reactor due to their superior swelling resistance. It is important to evaluate the mechanical properties of the dissimilar joints after thermal aging. The present study evaluated and discussed the effect on the tensile properties of EB welded dissimilar joints produced by thermal aging up to 30000 h. Most welds were overmatched for all aging conditions and ultimate tensile strength of aged WM were higher than those of aged base metals (PNC-FMS and 316SS. UTS of the WM aged at 400$$^{circ}$$C was about 1.5 times higher than that of as-received WM (1100 MPa), but there was no significant change in the uniform elongation before and after aging. The Cr-rich phase were observed in a part of WM areas after thermal aging at 400 and 450$$^{circ}$$C. The Cr-rich phase at 400$$^{circ}$$C was finer and more homogenous than those at 450$$^{circ}$$C.

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