We study the regularities of oxide formation on steel of the SUH409L ferritic class (Fe–11Cr) in the case of diffusive oxidation (at temperatures of 600–800°C, for 24–150 h in an argon-oxygen mixture with about 20% of oxygen) and its influence on the long-term strength of steel in lead melts at 600°C. It is shown that, as the temperature and duration of oxidation increase, the phase composition of the film evolves, as a result of the intensification of the diffusion of chromium in surface layers, from magnetite to chromium-containing spinel (Fe, Cr)3O4 with formation of the islands of Cr2O3 chromium oxide. The grain size increases from 35–40 mm to 60–80 mm. It is shown that the process of oxidation weakens the negative effect of the lead melt and, hence, the long-term strength of the oxidized steel on a base of 100 h increases by 15%.
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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 52, No. 3, pp. 69–73, May–June, 2016.
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Yas’kiv, O.I., Fedirko, V.M., Kukhar, I.S. et al. Influence of Diffusive Oxidation on the Long-Term Strength of Ferritic Steels in Lead Melts. Mater Sci 52, 371–376 (2016). https://doi.org/10.1007/s11003-016-9966-5
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DOI: https://doi.org/10.1007/s11003-016-9966-5