TY - JOUR N2 - The contribution summarises the results of oxygen activity determinations, which were measured and registered continuously in castings from cast irons with various types of graphite. The results were used to find the relationship between two variables: natural logarithm of oxygen activities and reverse value of thermodynamic temperature 1 /T. Obtained regression lines were used to calculate oxygen activity at different temperatures, to calculate Gibbs free energy ΔG at the different temperatures and to calculate the single ΔG value for significant temperature of the graphite solidification. The results were processed by a statistical analysis of data files for the different types of graphite with flake, vermicular and spheroidal graphite. Each material has its proper typical oxygen activities range and individual temperature function of Gibbs free energy for analysing and governing casting quality. L1 - http://www.journals.pan.pl/Content/87172/PDF/27_paper.pdf L2 - http://www.journals.pan.pl/Content/87172 PY - 2012 IS - No 4 DO - 10.2478/v10266-012-0125-7 KW - Continuous oxygen activity measurement KW - Calculation of Gibbs free energy KW - Cast iron solidification A1 - Elbel, T. A1 - Hampl, J. PB - The Katowice Branch of the Polish Academy of Sciences DA - 2012 T1 - Thermodynamic Analysis of Cast Irons Solidification With Various Types of Graphite UR - http://www.journals.pan.pl/dlibra/publication/edition/87172 T2 - Archives of Foundry Engineering ER -