Carbon enrichment during ferrite transformation in Fe-Si-C alloys

H. D. Wu, G. Miyamoto, Z. G. Yang, C. Zhang, H. Chen, T. Furuhara

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

The microstructure evolution, transformation kinetics and especially the C enrichment during isothermal ferrite transformation at 800, 750, 700 °C for Fe-(1.5, 3.0) mass%Si-0.4mass%C alloys were investigated in the present study. Both transformation kinetics and C enrichment in austenite (γ) at grain boundary ferrite (GBF)/γ interfaces suggest that negligible partitioning local equilibrium (NPLE) mode operates during non-partitioned ferrite growth under the conditions investigated. Deviations of C enrichment in γ at Widmanstatten ferrite (WF)/γ interfaces from NPLE limit at early stages were observed. These deviations are deduced to be resulted from intrinsic interface mobility rather than solute drag effect. In addition, mobility of WF/γ interfaces is found to be lower than that for incoherent GBF/γ interfaces reported in literature.

Original languageEnglish
Pages (from-to)68-77
Number of pages10
JournalActa Materialia
Volume149
DOIs
Publication statusPublished - 2018 May 1

Keywords

  • Carbon enrichment
  • EPMA
  • Interface mobility
  • NPLE limit
  • Pro-eutectoid ferrite
  • Si containing steels

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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