Design of ultrafine eutectic-dendrite composites with enhanced mechanical properties in Fe-based alloy

T. E. Kim, S. W. Sohn, J. M. Park, C. W. Bang, W. T. Kim, D. H. Kim

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Abstract

The effect of Mn content on the evolution of microstructure and the enhancement of mechanical properties in Fe-Nb-Mn hierarchical composites consisted of ultrafine eutectic and primary dendrite has been studied by using X-ray diffractometry, scanning electron microscopy, transmission electron microcopy and compression test. Fe-11Nb-5Mn hierarchical composite consisted of α′-Fe dendrite and urtrafine α′-Fe + Fe2Nb eutectic, and exhibited a reasonably good combination of mechanical properties, i.e. yield strength of 1283 ± 10 MPa and compressive plastic strain of 7.75 ± 5%, while Fe-11Nb-15Mn composite consisted of É-Fe dendrite and É-Fe + Fe2Nb eutectic structure with some retained γ phase, and exhibited a far better combination of mechanical properties, i.e. higher yield strength of 1462 ± 10 MPa and larger compressive plastic strain of 11.28 ± 2%. The origin for the simultaneous enhancement of high strength and large plastic strain is attributed to É-Fe martensite formation and strain-induced martensitic transformation from É to α′ during deformation.

Original languageEnglish
Pages (from-to)667-671
Number of pages5
JournalMetals and Materials International
Volume19
Issue number4
DOIs
Publication statusPublished - 2013 Jul 1

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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