Ductile irons' mechanical properties are strongly influenced by the microstructure of metal matrix, presence of impurities and presence of graphite particles. These particles are characterized by their morphological characteristics (e.g. shape, dimension, etc.): the more the shape of the graphite particles is near to a sphere (nodule), the better the mechanical properties (e.g. toughness and crack propagation resistance) are. The standard that is commonly used to characterize the morphology of graphite particles is only semi-quantitative. In this work, an image processing computer procedure is proposed for the characterization of the shape of graphite nodules. Pictures of the metallographic sections acquired by means of a light optical microscope are processed in order to obtain a simpler image representation where the nodules are black objects over a white background (image binarization). On this binary picture each nodule can be easily examined to estimate all the shape parameters of interest, lime area, eccentricity, solidity, etc. Suitable statistics of the shape parameters are adopted to classify the real data of ductile iron specimens. © 2007 Elsevier B.V. All rights reserved.

Quantitative shape evaluation of graphite particles in ductile iron / DE SANTIS, Alberto; O., Di Bartolomeo; Iacoviello, Daniela; F., Iacoviello. - In: JOURNAL OF MATERIALS PROCESSING TECHNOLOGY. - ISSN 0924-0136. - STAMPA. - 196:1-3(2008), pp. 292-302. [10.1016/j.jmatprotec.2007.05.056]

Quantitative shape evaluation of graphite particles in ductile iron

DE SANTIS, Alberto;IACOVIELLO, Daniela;
2008

Abstract

Ductile irons' mechanical properties are strongly influenced by the microstructure of metal matrix, presence of impurities and presence of graphite particles. These particles are characterized by their morphological characteristics (e.g. shape, dimension, etc.): the more the shape of the graphite particles is near to a sphere (nodule), the better the mechanical properties (e.g. toughness and crack propagation resistance) are. The standard that is commonly used to characterize the morphology of graphite particles is only semi-quantitative. In this work, an image processing computer procedure is proposed for the characterization of the shape of graphite nodules. Pictures of the metallographic sections acquired by means of a light optical microscope are processed in order to obtain a simpler image representation where the nodules are black objects over a white background (image binarization). On this binary picture each nodule can be easily examined to estimate all the shape parameters of interest, lime area, eccentricity, solidity, etc. Suitable statistics of the shape parameters are adopted to classify the real data of ductile iron specimens. © 2007 Elsevier B.V. All rights reserved.
2008
ductile cast iron; image segmentation; shape characterization
01 Pubblicazione su rivista::01a Articolo in rivista
Quantitative shape evaluation of graphite particles in ductile iron / DE SANTIS, Alberto; O., Di Bartolomeo; Iacoviello, Daniela; F., Iacoviello. - In: JOURNAL OF MATERIALS PROCESSING TECHNOLOGY. - ISSN 0924-0136. - STAMPA. - 196:1-3(2008), pp. 292-302. [10.1016/j.jmatprotec.2007.05.056]
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