Deoxidation of Ni-Cr Alloys with Aluminum and Titanium

V. Ya. Dashevskii, A. A. Aleksandrov, L. I. Leont`ev

Abstract


Thermodynamic analysis of the deoxidation process of Ni-Cr melts with aluminum and titanium was carried out. With the increase of chromium content in the melt, the minimum oxygen concentration increases. Aluminum at very low levels practically does not affect the concentration of oxygen in the melt, which is determined by the chromium content. At aluminum content is above ~0.01% for all alloys, aluminum already determines the solubility of oxygen in the melt. The minimum values of the oxygen concentration are achieved with an aluminum content of ~0.2%. For Ni-10% Cr, Ni-20% Cr and Ni-30% Cr alloys, the minimum oxygen concentration is 1,77?10-3, 7,15?10-3 and 9,51?10-3%, respectively. Titanium at low levels also practically does not affect the concentration of oxygen in the melt, which is determined by the chromium content. At titanium content above 0.01-0.03%, depending on the alloy composition, titanium already determines the solubility of the oxygen in the melt. The minimum values of the oxygen concentration are achieved with a titanium content of 0,565% and 0,635%, depending on the alloy composition. For Ni-10% Cr, Ni-20% Cr and Ni-30% Cr alloys, the minimum oxygen concentration is 2,53·10-3%, 6,95·10-3% and 5,86·10-3%, respectively

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References


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DOI: http://dx.doi.org/10.24892/RIJIE/20180402

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