Growth of ferrite needles in compacted graphite cast iron

G. A. DURÁN, T. PÉREZ, R. W. GREGORUTTI, R. C. MERCADER AND J. DESIMONI

Madrid

Conferencia; Industrial Applications of the Mössbauer Effect; 2004

The austempering kinetics transformation of compacted graphite cast irons austempered at 623K is studied The length (l) and the number per unit volume (N) of ferrite needles were followed by Scanning Electron Microscopy (SEM), while Mössbauer spectroscopy (MS) was used to determine the austenite relative areas. The SEM results are compared with theoretical calculations available in the literature and indicate that the diffusion of C atoms in austenite controls the transformation, confirming the indirect MS determinations.