INVESTIGADORES
DOMMARCO ricardo
artículos
Título:
Abrason resistance of high nodule count ductile iron
Autor/es:
DOMMARCO, RICARDO C.; SOUSA, M. E.; SIKORA, J. A.
Revista:
WEAR
Editorial:
Elsevier
Referencias:
Lugar: Amsterdam; Año: 2004 vol. 257 p. 1185 - 1192
ISSN:
0043-1648
Resumen:
Thin wall ductile iron is being used in the industry as a way to improve the strength to weight ratio. Nevertheless, thin walled sections
promote microstructural changes such as an important increase in the nodule count. This paper examines the influence of the nodule count
on the abrasion resistance of ductile iron castings, having different matrix microstructures, and analyzes the main nodule characteristic
affecting abrasion. Different ductile cast iron test samples, from 1.5 to 25mm in thickness, having nodule counts varying between 250 and
2000 nod/mm2, were used. The samples for abrasion tests were heat treated in order to adjust the matrices to fully martensitic, ferritic, pearlitic
and ausferritic microstructures. The abrasion resistance was evaluated according to the ASTM G 65 standard. The results showed that in all
cases, when the nodule count increases the abrasion resistance decreases, as a consequence of the increase in total amount of nodules perimeter
exposed to abrasion which increase the overall rate of wear
and ausferritic microstructures. The abrasion resistance was evaluated according to the ASTM G 65 standard. The results showed that in all
cases, when the nodule count increases the abrasion resistance decreases, as a consequence of the increase in total amount of nodules perimeter
exposed to abrasion which increase the overall rate of wear
2, were used. The samples for abrasion tests were heat treated in order to adjust the matrices to fully martensitic, ferritic, pearlitic
and ausferritic microstructures. The abrasion resistance was evaluated according to the ASTM G 65 standard. The results showed that in all
cases, when the nodule count increases the abrasion resistance decreases, as a consequence of the increase in total amount of nodules perimeter
exposed to abrasion which increase the overall rate of wear