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Effects of mode-I stresses on the oxidation and failure mechanisms of Ni-20Cr and Ni-15Cr-8Fe alloys in sulfur dioxide

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Abstract

Two alloys, Ni-20Cr and Ni-15Cr-8Fe, as wire specimens, were exposed to sulfur dioxide between 325 and 800°C, with applied external stresses (mode I). Their mechanical properties have been investigated, and the variation of their radius has been precised by conductivity measurements. For the Ni-20Cr alloy, below 550°C, the failure process combines cracking and corrosion: Cr2S3 crystals formed at the tip of the cracks facilitate their propagation. Above 550°C, no barrier effect is observed, and intergranular corrosion takes place. For the Ni-15Cr-8Fe alloy, mode-I stresses bolster intergranular corrosion.

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Authors and Affiliations

  1. Université d'Artois, Lens, France

    C. Mathieu

  2. Université de Reims, France

    S. Toesca

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  1. C. Mathieu
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  2. S. Toesca
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Mathieu, C., Toesca, S. Effects of mode-I stresses on the oxidation and failure mechanisms of Ni-20Cr and Ni-15Cr-8Fe alloys in sulfur dioxide. Oxid Met 39, 155–165 (1993). https://doi.org/10.1007/BF00665609

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  • DOI: https://doi.org/10.1007/BF00665609

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