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Deoxidation Equilibria of Manganese, Silicon, and Aluminum in Iron-Nickel-Chromium Melts

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Abstract

Oxygen solution in Fe-Ni-Cr melts containing manganese, silicon, and aluminum has been thermodynamically analyzed and experimentally studied at 1873 K (1600 °C). The Fe-10 pctNi-20 pctCr and Fe-40 pctNi-15 pctCr compositions were studied as examples of the most frequently used alloys. Manganese is not a deoxidizer in these alloys, since manganese and chromium have similar affinities for oxygen. At low contents, silicon is also not a deoxidizer. However, above 0.358 pct for the Fe-10 pctNi-20 pctCr alloy and 0.261 pct for the Fe-40 pctNi-15 pctCr alloy, silicon decreases the oxygen concentration in the melts. Aluminum is an effective deoxidizer in the Fe-Ni-Cr melts. It decreases the oxygen concentration when its content is higher than 2.914 × 10−4 pct in the Fe-10 pctNi-20 pctCr alloy and 2.109 × 10−3 pct in the Fe-40 pctNi-15 pctCr alloy. Minimum oxygen concentrations are observed at aluminum contents of about 0.24 pct in the Fe-10 pctNi-20 pctCr alloy and at about 0.23 pct in the Fe-40 pctNi-15 pctCr alloy. The combined deoxidation of Fe-10 pctNi-20 pctCr and Fe-40 pctNi-15 pctCr alloys with silicon and manganese and also with aluminum and silicon was studied. The lower oxygen concentrations were reached as a result of complex deoxidation in comparison with the cases when deoxidized separately by each element at the same concentration levels.

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Authors and Affiliations

  1. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences (IMET RAS), Leninskii prosp., 49, Moscow, 119991, Russia

    Viktor Dashevskii (Professor, Head of Laboratory), Aleksandr Aleksandrov (Senior Researcher), Akim Kanevskii (Senior Researcher) & Leopold Leont’ev (Professor, Chief Researcher)

Authors
  1. Viktor Dashevskii
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  2. Aleksandr Aleksandrov
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  3. Akim Kanevskii
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  4. Leopold Leont’ev
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Correspondence to Aleksandr Aleksandrov.

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Manuscript submitted March 18, 2015.

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Dashevskii, V., Aleksandrov, A., Kanevskii, A. et al. Deoxidation Equilibria of Manganese, Silicon, and Aluminum in Iron-Nickel-Chromium Melts. Metall Mater Trans B 47, 1839–1850 (2016). https://doi.org/10.1007/s11663-016-0609-x

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  • DOI: https://doi.org/10.1007/s11663-016-0609-x

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