TY - THES T1 - Quantitative 3D characterization of graphite morphologies in cast iron using FIB microstructure tomography A1 - Velichko,Alexandra Y1 - 2008/10/01 N2 - Cast iron with different graphite morphologies were thoroughly analyzed and their influence on the thermal and electrical properties was studied with the goal of determining clear correlations between manufacturing parameters, microstructure and properties for advanced material development and non-destructive quality control. It was shown, that there is no simple relationship to describe these properties based only on the microstructural parameters volume fraction and specific surface area. Cast iron properties depend mainly on the graphite type. To provide objective graphite classification an automatic algorithm was developed. Particle parameters: roundness, compactness and MaxFeret provide a straight forward classification. Graphite morphology was analyzed with FIB tomography. Graphite crystal structure, nucleation and growth mechanisms were studied using chemical analysis and analysis on TEM-foils. 3D quantitative characterization of the size, shape and spatial connectivity, as well as the growth mechanisms and thus the structure of different graphite morphologies was done. Analysis of 2D sections of the 3D particles suggested improving the 2D classification by using "support vector machine';. Effective properties of cast iron were simulated using tomographic data. It was shown, that for the correct estimation not only volume fraction, size and shape of the graphite particle, but also their crystallographic structure and spatial connectivity has to be taken into consideration. KW - Gefüge KW - Gusseisen KW - Lamellengraphitguss KW - Gusseisen mit Vermiculargraphit KW - Graphit KW - Tomographie KW - Volumentomographie CY - Saarbrücken PB - Universitäts- und Landesbibliothek AD - Postfach 151141, 66041 Saarbrücken UR - http://scidok.sulb.uni-saarland.de/volltexte/2008/1712 ER -