Thermodynamic Analysis of the Graphite Flake Formation of Low Manganese and Sulfur Gray Cast Iron

Low manganese and sulfur gray irons were produced by adding inoculant base Fe-Si with small amounts of Al and Ca in the ladle. The effect of the cast thickness, inoculant amount and shakeout time of the green sand molds were studied on the graphite flake formation by microscopically techniques. A th...

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Bibliographic Details
Published in:Archives of metallurgy and materials 2021-01, Vol.66 (1), p.249-258
Main Authors: Reyes-Castellanos, G, Cruz-Ramírez, A, Colin-García, E, Gutiérrez-Pérez, V H
Format: Article
Language:English
Subjects:
Aluminum oxide
cell count
Flakes
Graphite
Gray iron
Green sand
inoculation
Liquid phases
Manganese
Phase diagrams
Sand molds
Silicon
Sulfur
thermodynamic analysis
Thermodynamics
Zirconium dioxide
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Summary:Low manganese and sulfur gray irons were produced by adding inoculant base Fe-Si with small amounts of Al and Ca in the ladle. The effect of the cast thickness, inoculant amount and shakeout time of the green sand molds were studied on the graphite flake formation by microscopically techniques. A thermodynamic analysis was carried out for the cast iron produced with the FactSage 7.2 software. Stability phase diagrams were obtained for both gray cast irons to different manganese (0.1 to 0.9 wt.%) and sulfur (0.01 to 0.12 wt.%) amounts to 1150°C. It was shown that lower amounts of manganese and sulfur allow forming the 3Al2O3·2SiO2, Al2O3, and ZrO2 solid compounds. The thermodynamic results match with those obtained by SEM-EDS. It is possible to form MnS particles in the liquid phase when the solubility product (%Mn) × (%S) equals 0.042 and 0.039 for heats A and B, respectively.
ISSN:1733-3490
2300-1909
DOI:10.24425/amm.2021.134782