Identification of Cu-rich precipitates in pearlitic spheroidal graphite cast irons

CARAZO, FERNANDO D.; TOLLEY, ALFREDO J.; GARCÍA, LAURA N.; BOERI, ROBERTO E.; CARAZO, FERNANDO D.; TOLLEY, ALFREDO J.; GARCÍA, LAURA N.; BOERI, ROBERTO E.

MATERIALS SCIENCE AND TECHNOLOGY

MANEY PUBLISHING

Lugar: London; Año: 2019 vol. 35 p. 2252 - 2258

0267-0836

This investigation studies the partitioning of Mn and Cu ? and Si? between ferrite and cementite in the pearlite of two alloys containing similar Mn and Si concentrations, but different Cucontents, keeping the Cu concentration within the usual industrial limits. The results confirm thepartitioning of all the elements between ferrite and cementite during pearlite growth. Furthermore, the presence of nanometric Cu-rich precipitates was detected for an alloy with typical Cucontents for achieving pearlitic structures in spheroidal graphite cast irons. This might be linkedto the microsegregation of Cu developed during the solidification step. These precipitates havenot been reported before and cannot be ignored as they can affect the transformation kineticsand the mechanical properties of the alloy.