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Morphology of stress corrosion cracking due to exposure to high-temperature water containing hydrogen peroxide in stainless steel specimens with different crevice lengths

異なるき裂長さを有するステンレス鋼試験片を過酸化水素を含む高温水に曝したことによる応力腐食割れの形態

中野 純一; 佐藤 智徳; 加藤 千明; 山本 正弘; 塚田 隆; 加治 芳行

Nakano, Junichi; Sato, Tomonori; Kato, Chiaki; Yamamoto, Masahiro; Tsukada, Takashi; Kaji, Yoshiyuki

ステンレス鋼(SS)の応力腐食割れ(SCC)進展形態に及ぼすすきま構造と過酸化水素(H$$_{2}$$O$$_{2}$$)の関係を評価するため、H$$_{2}$$O$$_{2}$$を含む高温水中でき裂進展試験を行った。異なる疲労予き裂長さを有する小型コンパクト・テンション(CT)試験片を作製し、20$$sim$$300 ppb H$$_{2}$$O$$_{2}$$を561Kの高温水中へ注入した。粒界型SCC(IGSCC)がCT試験片のサイドグルーブ近傍にのみ観察された。予き裂の短縮により、IGSCCの領域はCT試験片の中央部まで拡大した。SSに及ぼすH$$_{2}$$O$$_{2}$$の影響は高レベルのH$$_{2}$$O$$_{2}$$に曝された表面近傍に強く現れた。H$$_{2}$$O$$_{2}$$の残存率の計算はき裂の両側から流れ込んだH$$_{2}$$O$$_{2}$$の影響がき裂開口部を通して流れ込んだそれらよりも明瞭であることを示した。

Crack growth tests were performed in high-temperature water containing hydrogen peroxide (H$$_{2}$$O$$_{2}$$) to evaluate the relationships between the crevice structure and H$$_{2}$$O$$_{2}$$ on stress corrosion cracking (SCC) growth morphology of stainless steel (SS). Small compact tension (CT) specimens with different fatigue pre-crack lengths were prepared. 20$$sim$$300 ppb H$$_{2}$$O$$_{2}$$ was injected into the high-temperature water at 561 K. Intergranular SCC (IGSCC) was observed only near the side grooves of the CT specimens. Owing to pre-crack shortening, the IGSCC area expanded to the central region of the CT specimens. The effects of H$$_{2}$$O$$_{2}$$ on SS appeared intensely near the surfaces exposed to high levels of H$$_{2}$$O$$_{2}$$. The calculations for the percentage of H$$_{2}$$O$$_{2}$$ remaining showed that the effects of H$$_{2}$$O$$_{2}$$ flowed from both sides of the crack were more obvious than those flowed from the crack mouth.

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パーセンタイル:72.96

分野:Materials Science, Multidisciplinary

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