Ferrite Growth During Cooling Through the Ferrite-Austenite-Graphite Field in SGI

GARCÍA, LAURA NOEL; CARAZO, FERNANDO DIEGO; BOERI, ROBERTO ENRIQUE

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE

SPRINGER

Lugar: Berlin; Año: 2019

1073-5623

This investigation examines the growth of ferrite during the cooling of spheroidal graphite castirons through the ferrite-austenite-graphite phase field as conditioned by the partitioning ofSilicon. Two different melts are examined. Ferrite growth was assumed to take place underparaequilibrium conditions. The study involves the measurement of the temperature of ferriteprecipitation start under slow cooling conditions by DSC. Thermo-Calc was used to calculatethe equilibrium concentration of Si at the ferrite precipitation start temperature. Calculated Siconcentrations are compared to microsegregation profiles measured on the same alloys in aprevious study. The results led to conclude that partitioning of Silicon does not represent aconstraint for ferrite to grow between the upper and lower limits of the three-phase field,contradicting some of the existing literature.