高濃度塩化物環境におけるフェライト系ステンレス鋼の割れ形態

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  • 小川 洋之
    新日本製鉄株式会社生産技術研究所プロセス冶金研究室
  • 伊藤 功
    新日本製鉄株式会社光製鉄所研究室
  • 林 巨幸
    新日本製鉄株式会社光製鉄所研究室

書誌事項

タイトル別名
  • Morphology of Stress Corrosion Cracking of Ferritic Stainless Steels in the Concentrated Chloride Environment
  • コウ ノウド エンカブツ カンキョウ ニ オケル フェライトケイ ステンレス

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説明

The morphology of stress corrosion cracking of the ferritic stainless steel was investigated in the concentrated chloride solution. The test result was as followings: (1) Fe-Cr and Fe-Cr-Mo alloys nucleated intergranular SCC for the high test loading. On the other hand, fine transgranular cracking and pitting corrosion grew for the low test loading, and, in this case, the fatal damage was caused by pitting corrosion. (2) The stress corrosion sensitivity of the ferritic steel was increased with nickel addition. At the same time, twin frequency grew with nickel addition. (3) The cracking morphology of Fe-Cr-Mo-Ni alloys depended on the chloride ion concentration and pH of the test solution. Transgranular SCC nucleated and propagated in the deformation twins in case of low pH and high Cl- ion concentration. On the other hand, intergranular SCC occurs in case of high pH and low Cl- ion concentration.

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