High silicon ductile iron: possible uses in the production of parts with ?dual phase ADI? microstructure

BASSO, A.D; CALDERA, M.; RIVERA, G.L.; SIKORA, J.A.

ISIJ INTERNATIONAL

IRON STEEL INST JAPAN KEIDANREN KAIKAN

Lugar: Tokio; Año: 2012 vol. 52 p. 1130 - 1134

0915-1559

The aim of this paper is to study the advantages and disadvantages of using high silicon ductile iron to produce cast parts with "Dual Phase ADI" microstructure. In this study, four ductile irons with different percentages of silicon: 2.4, 3.1, 3.5, and 4.2%, respectively, were used. Samples from each cast were subjected to heat treatment to determine the intercritical interval. Significant increase in the upper and lower critical temperatures was found as the amount of silicon incremented. However, the difference between the lower and upper critical temperatures (intercritical interval amplitude) remained approximately constant for all ductile irons. The materials were metallographically and mechanically characterized in the as-cast conditions and after full annealing heat treatments, Tensile, hardness and impact properties were determined as a function of the silicon level. The results suggest that high silicon ductile iron (Si content ranging from 3.0 to 3.6%) can be used in the manufactured of cast parts with "Dual Phase ADI" microstructures, yielding distinctive advantages in the production process if compared to low and medium silicon ductile irons.