Abstract
The healing of cracks in protective oxide scales on four heat-resistant steels has been investigated at 800°C in constant-extension-rate tests, in metallographie and in SEM-examinations. The experimental results suggest the existence of a critical strain rate below which crack healing leads to an instant repair of the cracked scale thuspreventing increased internal corrosion. The existence of this critical strain rate can be explained by model considerations, the results of which are in agreement with the results from the experiments. On the basis of scale cracking data from a previous paper and healing data in the present paper “scale cracking/healing maps” have been developed characterizing the protective capabilities of the oxide scales under tensile strain.
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References
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Schütze, M. The healing behavior of protective oxide scales on heat-resistant steels after cracking under tensile strain. Oxid Met 25, 409–421 (1986). https://doi.org/10.1007/BF01072918
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DOI: https://doi.org/10.1007/BF01072918