SUS304Lの粒界腐食に及ぼすP,Siの粒界偏析の影響

DOI Web Site Web Site 被引用文献3件 参考文献9件

書誌事項

タイトル別名
  • The Effect of P and Si Segregation to Grain Boundary on the Intergranular Corrosion of Type 304L Stainless Steel
  • SUS304L ノ リュウカイ フショク ニ オヨボス P Si ノ リュウカ
公開日
1990
DOI
  • 10.2355/tetsutohagane1955.76.6_948
公開者
一般社団法人 日本鉄鋼協会

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説明

The correlation between grain boundary segregation and intergranular corrosion in solution heat treated Type 304L stainless steel was examined. Grain boundary composition was analyzed with a high resolution analytical electron microscope (HRAEM). Intergranular corrosion susceptibility was tested in 9 kmol/m3 nitric acid solution containing 1 mol/m3 Ru at 373 K for 1.8 Ms. The followings are found: (1) The amount of phosphorus segregation to grain boundaries in solution heat treated stainless steels were successfully measured quantitatively with HRAEM. The amount of phosphorus segregation increases with higher phosphorus content, and the phosphorus concentration of grain boundary becomes about a hundred times of that of grain interior. (2) Phosphorus and silicon additions cause intergranular corrosion. The correlation between amount of phosphorus segregation and intergranular penetration depth is seen in low silicon content steels. But high silicon content steels show deep intergranular penetration depth, in spite of the small amount of phosphorus segregation. (3) Assuming MCLEAN'S model of equilibrium segregation, the segregation free energy of phosphorus at 1323 K is estimated as about 57 kJ/mol.

収録刊行物

  • 鉄と鋼

    鉄と鋼 76 (6), 948-955, 1990

    一般社団法人 日本鉄鋼協会

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