Load partitioning between ferrite and cementite during elasto-plastic deformation of an ultrahigh-carbon steel

M. L. Young, J. D. Almer, M. R. Daymond, D. R. Haeffner, D. C. Dunand*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

126 Scopus citations

Abstract

An ultrahigh-carbon steel was heat-treated to form an in situ composite consisting of a fine-grained ferritic matrix with 34 vol.% submicron spheroidized cementite particles. Volume-averaged lattice elastic strains for various crystallographic planes of the α-Fe and Fe3C phases were measured by synchrotron X-ray diffraction for a range of uniaxial tensile stresses up to 1 GPa. In the elastic range of steel deformation, no load transfer occurs between matrix and particles because both phases have nearly equivalent elastic properties. In the steel plastic range after Lüders band propagation, marked load transfer takes place from the ductile α-Fe matrix to the elastic Fe3C particles. Reasonable agreement is achieved between phase lattice strains as experimentally measured and as computed using finite-element modeling.

Original languageEnglish (US)
Pages (from-to)1999-2011
Number of pages13
JournalActa Materialia
Volume55
Issue number6
DOIs
StatePublished - Apr 2007

Keywords

  • Carbides
  • Ferritic steels
  • Metal matrix composites (MMC)
  • Synchrotron radiation
  • X-ray diffraction (XRD)

ASJC Scopus subject areas

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

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