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Article Abstract
In the current study, the thermodynamics of the slag-metal equilibrium reaction between Inconel 718 Ni-based alloy and CaF-CaO-AlO-MgO-TiO electroslag remelting (ESR)-type slags were systematically investigated in the temperature range from 1773 to 1973 K (1500 to 1700 °C). The equilibrium Al content increased with increasing temperature, whereas the equilibrium Ti content decreased with increasing temperature at a fixed slag composition. The important factors for controlling the oxidation of Al and Ti in the Inconel 718 superalloy were TiO > AlO > CaO > CaF > MgO in ESR-type slag and Al > Ti in a consumable electrode. The conventional method of sampling by means of a quartz tube could result in contamination of the molten metal and changes in the size of the "special reaction interface". Therefore, a novel method was used in the present study to investigate the slag-metal reaction kinetics to accurately obtain the kinetic parameters. The mass transfer coefficient was determined by coupling with the kinetic model derived from the assumption that the reaction rate ([Al] + (TiO) = [Ti] + (AlO)) was controlled by the mass transfer of [Ti], [Al], (TiO) and (AlO) in the boundary layer, respectively.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5869728 | PMC |
| http://dx.doi.org/10.1038/s41598-018-23556-3 | DOI Listing |
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