Experimental Measurements and Numerical Analysis of Al Deoxidation Equilibrium of Molten Fe–Cr–Ni Alloy

Hiroshi Fukaya; Seika Nakajima; Jonah Gamutan; Shigeru Suzuki; Koji Kajikawa; Ken Saito; Takahiro Miki

doi:10.2355/isijinternational.ISIJINT-2020-710

Special Issue on "Recent Progress in Inclusion/ Precipitate Engineering"

Experimental Measurements and Numerical Analysis of Al Deoxidation Equilibrium of Molten Fe–Cr–Ni Alloy

Hiroshi Fukaya , Seika Nakajima, Jonah Gamutan, Shigeru Suzuki, Koji Kajikawa, Ken Saito, Takahiro Miki

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Keywords: quadratic formalism, thermodynamics, activity, excess free Gibbs energy, Redlich–Kister polynomial, aluminum deoxidation equilibrium, Fe–Cr–Ni alloy, sub-regular solution model, inclusion

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2021 Volume 61 Issue 9 Pages 2331-2339

DOI https://doi.org/10.2355/isijinternational.ISIJINT-2020-710

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Abstract

The aluminum deoxidation equilibrium in molten Fe-10 to 40mass%Cr-8mass%Ni and Fe-18mass%Cr-8 to 30mass%Ni alloys was experimentally determined at 1873 K and 1773 K to obtain the thermodynamic parameters at both temperatures, corresponding to the refining and casting processes, respectively. Thermodynamic analysis on Al deoxidation was carried out based on the sub-regular solution model using a Redlich–Kister type polynomial. Fe–Al, Ni–Al, Cr–Al and Fe–Cr–Ni interaction parameters were obtained from experimental results and a thermodynamic assessment. Using these parameters, the Al deoxidation equilibrium over the complete composition range of the Fe–Ni alloy and in more than 50mass%Fe of the Fe–Cr and Fe–Cr–Ni alloys can be calculated for the temperature ranges of both of the refining and casting processes.

Calculated logK’ of the Al deoxidation equilibrium of the Fe–Cr–Ni system at liquidus temperatures. Fullsize Image

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