18-8ステンレス鋼の応力腐食割れ感受性に関する電子顕微鏡的研究

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  • A Study on the Stress Corrosion Cracking Susceptibility of 18-8 Stainless Steel by Electron Microscopy
  • 18-8 ステンレス コウ ノ オウリョク フショク ワレ カンジュセイ ニ カンスル デンシ ケンビキョウテキ ケンキュウ

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It is well known that 18-8 stainless steels are much more susceptible to stress corrosion cracking than Inconel in solutions containing chlorine ions.<BR>This work was attempted to find out whether the susceptibility to stress corrosion cracking of these metals depended on the kind of surface films of the alloys or on the dislocation distribution in the alloys. The effect of additional elements on the dislocation distribution in 18-8 stainless steel was also investigated by transmission electron microscopy.<BR>The surface films formed on 18-8 stainless steel and Inconel, which were immersed in pure water or MgCl2 aqueous solution (Cl−; 500 ppm) for 20 hr at 300°C were investigated by reflection electron diffraction and diffuse reflection spectra.<BR>The films formed on both 18-8 stainless steel and Inconel consisted of Ni(OH)2. On the other hand, there was a remarkable difference in dislocation distribution in these metals; in 18-8 stainless steel the dislocations were confined to slip planes and stacking faults were present, while in Inconel the slip was not restricted to a particular direction and cross slip easily was allowed.<BR>From these results, it has been confirmed that the susceptibility to stress corrosion cracking of 18-8 stainless steel is closely related to stacking fault energy.<BR>The effect of additional elements on the dislocation distribution in 18-8 stainless steel was also discussed.

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  • 日本金属学会誌

    日本金属学会誌 28 (5), 237-244, 1964

    公益社団法人 日本金属学会

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