Stress-Corrosion Cracking of Sensitized Austenitic Stainless Steels

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  • 敏感化熱処理を施したオーステナイト質ステンレス鋼の応力腐食割れ
  • ビンカンカ ネツ ショリ オ ホドコシタ オーステナイトシツ ステンレス コウ ノ オウリョク フショク ワレ

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Abstract

The effect of sensitizing heat treatment on the susceptibility for cracking and crack propagation in six austenitic stainless steels was studied using U-bend specimens. It has been considered that in general the stress corrosion cracks of austenitic stainless steel in chloride solution are of transcrystalline nature. However, some results of this study showed intergranular cracks in sensitized steel. From the results of 42%MgCl2-experiment, cracks were always transcrystalline in the sensitized specimen as well as in the annealed one, and the crack sensitivity of the steels did not increase by sensitizing treatment. On the contrary, intergranular cracks appeared in some of the sensitized specimen in NaCl solution. In this case, steels were more sensitive to the stress corrosion cracking in sensitized state than in annealed state.In extra-low carbon or stabilized steels, however, the cracks were always transcrystalline regardless of the pre-treatment of the specimen, and the crack sensitivity of these steels did not increase by sensitizing treatment. The current density-potential curves in chloride solution were observed on these steels, and the relationship between the anodic polarizability of steels and the susceptibilit and the path of stress corrosion was discussed. The conditions causing intergranular cracking were also discussed.

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