Thermodynamic Analysis of Cast Irons Solidification With Various Types of Graphite

被引：2
|
作者：
Elbel, T. [1 ]
Hampl, J. [1 ]
机构：
[1] VSB Tech Univ Ostrava, Fac Met & Mat Engn, 17 Listopadu 15, CS-70833 Ostrava, Czech Republic
来源：
ARCHIVES OF FOUNDRY ENGINEERING | 2012年 / 12卷 / 04期
关键词：
Continuous oxygen activity measurement; Calculation of Gibbs free energy; Cast iron solidification;
D O I：
10.2478/v10266-012-0125-7
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
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 Delta G at the different temperatures and to calculate the single Delta G 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.
引用
收藏
页码：157 / 165
页数：9
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