EPR試験結果に及ぼすCr欠乏, 析出物及びMoの影響

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タイトル別名
  • The Influences of Cr Depletion, Precipitate and Mo on EPR Test Result
  • EPR シケン ケッカ ニ オヨボス Cr ケツボウ セキシュツブツ オヨビ

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説明

The degree of sensitization of austenitic stainless steels (Type 304, 316, 321, 347) heat-treated at different conditions were evaluated by EPR test, ASTM A262-A, A262-B, A262-C and A262-E tests to study the correlation between the reactivation ratio obtained by EPR test and the intergranular corrosion (IGC) susceptibility obtained by the corrosion tests (A262-A-E tests). To clarify the influence of precipitaties on the results of EPR test and A262-A-E tests, the morphology of the precipitates were observed by Transmission Electron Microscope and Energy Dispersive X-ray Spectrometer, and the dissolution mode was observed by optical microscope. The critical reactivation at which the specimens start to show the IGC susceptibility in the A262E test increased with the following order; Type 316<Type 304<Type 321<Type 347. The causes of this dependency of the critical reactivation ratio on the kinds of steels was discussed in terms of the soluble carbon content and Cr profile near grainboundaries. In the EPR test, the dissolution initiates at the Cr depleted zone, but not at the precipitates.

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