Stress-Corrosion Cracking of Heat-Treated Austenitic Stainless Steels

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  • 各種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
  • カクシュ 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 heat-treatment temperature on the susceptibility of stress corrosion cracking was studied using a direct load apparatus. The quantitative relationship between applied stress and the time to failure was obtained on annealed 18-8 in boiling 42%MgCl2 solution. Between 400∼800°C, the effect of heating temperature on the susceptibility of stress corrosion was studied in boiling 42%MgCl2 and NaCl solution. In MgCl2 solution, the effect of heating temperature was very small and the crack occurring in this solution was always transgranular. In NaCl solution, on the contrary, the susceptibility was definitely increased by heating at 600 to 800°C, and in this temperature range, the path of cracks was mainly intergranular. In NaCl solution, intergranular corrosion was scarcely observed on the surface of sensitized unloaded specimen though the specimen under tensile stress failed by intergranular cracking. In acidified copper sulphate solution, which has been known to attack sensitized specimens intergranularly without any tensile stress, the propagation of intergranular crack in the stressed specimen was much more serious than the penetration of ordinary intergranular corrosion through the surface the specimen. The conditions causing intergranular cracking were discussed again.

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