Co-precipitated and collocated carbides and cu-rich precipitates in a Fe-Cu steel characterized by atom-probe tomography

R. Prakash Kolli*, David N. Seidman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

The composition of co-precipitated and collocated NbC carbide precipitates, Fe3C iron carbide (cementite), and Cu-rich precipitates are studied experimentally by atom-probe tomography (APT). The Cu-rich precipitates located at a grain boundary (GB) are also studied. The APT results for the carbides are supplemented with computational thermodynamics predictions of composition at thermodynamic equilibrium. Two types of NbC carbide precipitates are distinguished based on their stoichiometric ratio and size. The Cu-rich precipitates at the periphery of the iron carbide and at the GB are larger than those distributed in the α-Fe (body-centered cubic) matrix, which is attributed to short-circuit diffusion of Cu along the GB. Manganese segregation is not observed at the heterophase interfaces of the Cu-rich precipitates that are located at the periphery of the iron carbide or at the GB, which is unlike those located at the edge of the NbC carbide precipitates or distributed in the α-Fe matrix. This suggests the presence of two populations of NiAl-type (B2 structure) phases at the heterophase interfaces in multicomponent Fe-Cu steels.

Original languageEnglish (US)
Pages (from-to)1727-1739
Number of pages13
JournalMicroscopy and Microanalysis
Volume31
DOIs
StatePublished - Nov 17 2014

Keywords

  • atom-probe tomography
  • cementite
  • heterogeneous precipitation
  • niobium carbide precipitates
  • short-circuit diffusion

ASJC Scopus subject areas

  • Instrumentation

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