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Observations on the microstructure of 20Cr-25Ni-Nb stainless steel after exposure to iodine vapor during creep at 750°C

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Abstract

The microstructure of 20Cr-25Ni-Nb stainless steel creep specimens has been examined in detail using optical and electron microscopy, after exposure to iodine vapor, air, or vacuum for periods up to ∼1600 hr at 750°C. The overall corrosion-oxidation rate in iodine vapor was linear and the duplex product which formed was typical of enhanced oxidation of this steel in other environments. Three significant subsurface microstructural changes observed during long-term exposure to iodine vapor were the formation of subsurface intergranular voids, enhanced chromium depletion, and increased intragranular precipitation of chromium-rich particles; each of these effects is discussed in detail and interpreted in terms of the breakdown of the initial protective oxide by iodine vapor.

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  1. Berkeley Nuclear Laboratories, Central Electricity Generating Board, Berkeley, Gloucestershire, England

    R. C. Lobb

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Lobb, R.C. Observations on the microstructure of 20Cr-25Ni-Nb stainless steel after exposure to iodine vapor during creep at 750°C. Oxid Met 15, 147–167 (1981). https://doi.org/10.1007/BF00603759

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  • DOI: https://doi.org/10.1007/BF00603759

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