Atomistic simulation of carbide formation in ferrite

R. J. Slooter*, M. H.F. Sluiter, W. G.T. Kranendonk, C. Bos

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

In this study possible routes from dissolved M and C atoms to a M-C (M = Ti, Nb) cluster are studied. Using atomistic modelling to perform relaxation simulations and molecular dynamics (MD) simulations for the Fe-M-C ternary system, the formation of clusters is studied for M. Additionally the stability of M-C clusters is assessed. The clustering of M and C atoms as observed in experiments is also found in simulations. The initial clusters found in this work have a (Fe,M)C composition with a large Fe fraction. Moreover, structurally relaxed clusters reveal that there are growth pathways with a monotone decrease in Gibbs energy, suggesting that the highest energy barrier in the formation of M-C clusters is the diffusion barrier for the atoms forming the cluster. The development of M-C clusters as found in this study suggests a formation mechanism for nano-precipitation of carbides consisting of several steps; first a C cluster forms, then M atoms attach to the C cluster forming a (Fe,M)C cluster, and in the final step the (Fe,M)C cluster transforms to a NaCl-structured carbide.

Original languageEnglish
Article number112455
Number of pages10
JournalComputational Materials Science
Volume230
DOIs
Publication statusPublished - 2023

Keywords

  • Carbides
  • Ferrite
  • MEAM
  • Precipitates

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