Please use this identifier to cite or link to this item: https://repositorio.fei.edu.br/handle/FEI/3418
Title: Formation of Cu-rich Nanoprecipitates in Cu Containing Pearlitic SGI
Authors: GARCÍA, LAURA N.
Rodrigo Magnabosco
BOERI, ROBERTO E.
TOLLEY, ALFREDO J.
SAAVEDRA, MARCELA E.
Issue Date: 29-Nov-2020
Abstract: The presence of Cu-rich nanoprecipitates in a pearlitic spheroidal graphite (ductile) cast iron alloyed with 0.82 wt%Cu was studied. The size and distribution of the precipitates were examined by transmission electron microscopy at different locations of the pearlitic matrix. Some areas were nearly free from precipitates, while other regions showed precipitates at the cementite and ferrite lamellae and at the ferrite/cementite interface. Calculation of the thermodynamic equilibrium under stable and metastable conditions using Thermo-Calc led to the identification of the conditions controlling the formation of Cu-rich nanoprecipitates along three different stages depending on the Cu concentration. Together with a differential scanning calorimetry test and elemental diffusional calculations, thermodynamic predictions supported the observation of Cu-rich precipitates despite the low concentration of Cu of the alloy investigated and allowed the authors to explain the observed heterogeneity in the distribution of precipitates as resulting from the heterogeneous distribution of Cu in the alloy caused by microsegregation during solidification. The knowledge gained is relevant for the design of strengthening strategies in SGI based on the dispersion of Cu-rich nanoprecipitates.
Keywords: spheroidal graphite cast irons
Cu-rich nanoprecipitates
nanostructured materials
Thermo-Calc
microsegregations
transmission electron microscopy
Journal: International Journal of Metalcasting
ISSN: 2163-3193
Citation: GARCÍA, L. N.; MAGNABOSCO, R.; BOERI, R. E.; TOLLEY, A. J.; SAAVEDRA, M. E. Formation of Cu-rich nanoprecipitates in Cu containing pearlitic SGI. International Journal of Metalcasting, v. 15, n. 4, p. 1164-1174, 2020.
Access Type: Acesso Aberto
DOI: 10.1007/s40962-020-00543-x
URI: https://repositorio.fei.edu.br/handle/FEI/3418
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