Author(s)

B. I. Imasogie, U. Wendt

Department of Metallurgical and Materials Engineering Faculty of Technology Obafemi Awolowo University, Ile-Ife, Nigeria..
Institut für Werkstofftechnik und Werkstoffprüfung Technische Universit?t Magdeburg, Germany..

A procedure and specification for evaluating the degree of spheroidization of graphite in spheroidal graphite iron (SGI), using a computer-based image analyzing system has been developed as an aid to structure-property-quality assessment. Both global and feature-specific numerical indices have been programmed and implemented using a Zeiss Jenaphot 2000 projection microscope and SEM interfaced to a computer-based MACROS III analyzer and a CCD video camera. The modular procedure has been tested and used to evaluate the effect of variation in the degree of spheroidization of graphite on the 0.2 % offset yield strength for an iron series ranging from ASTM type I (fully nodular) to ASTM type II-III-IV (mixtures of nodular and compacted/vermicular graphite) and were found to indicate good correlation.

Spheroidal graphite iron (SGI), graphite morphology, characterization, image analysis.

B. Imasogie and U. Wendt, "Characterization Of Graphite Particle Shape In Spheroidal Graphite Iron Using A Computer-Based Image Analyzer," Journal of Minerals and Materials Characterization and Engineering, Vol. 3 No. 1, 2004, pp. 1-12. doi: 10.4236/jmmce.2004.31001.