INVESTIGADORES
MASSONE Juan Miguel
congresos y reuniones científicas
Título:
Solidification Macrostructure of Compacted Graphite Cast Iron and its relationship with Shrinkage Porosity
Autor/es:
LOPEZ, MARCOS; G. RIVERA; J. M. MASSONE; ROBERTO E. BOERI
Lugar:
Mar del Plata
Reunión:
Congreso; 10th International Symposium on the Science and Processing of Cast Iron ? SPCI10; 2014
Resumen:
This work focuses on the study of
the solidification macrostructure of compacted graphite iron and its
relationship with shrinkage porosity formation. Cast samples especially
developed to present shrinkage porosity were examined
after applying the DAAS technique, which involves hot shake out of the castings
at temperatures above the eutectoid, followed by an austempering. The samples
were then sectioned, polished and etched with Nital 2%. The results were
compared with those obtained earlier by Rivera et al on spheroidal and flake
graphite cast irons. The results show that, similarly to spheroidal and flake
graphite irons, the solidification of compacted graphite iron is dominated by
the presence of relatively large grains of austenite that can be observed by
the naked eye. Differences in the grain size were detected as a function of the
position into the different volumes analyzed, observing a typical ingot
structure. The dispersed shrinkage cavities formed were found inside the grains
and located between the austenite dendrite arms.
The results allow the authors to
propose a novel explanation of the solidification of compacted graphite irons
that shares common features with spheroidal and lamellar graphite irons.