The influence of orientation and aluminium content on the deformation mechanisms of Hadfield steel single crystals

Elena G. Astafurova, Irina V. Kireeva, Yuriy I. Chumlyakov, Hans J. Maier, Huseyin Sehitoglu

Research output: Contribution to journalArticle

Abstract

The low stacking fault energy and high carbon content in Hadfield steel make twinning the basic deformation mechanism from the onset of plastic deformation in [111] and [011] oriented single crystals in tension at T = 77-300 K. Alloying with aluminium (2.7 Al in wt.%) results in an increase of stacking fault energy from 0.03 J m2 to 0.05 J m-2 and moves twinning to higher degrees of deformation (ϵpl > 15%). In aluminium-free [1-23] crystals twinning starts after 20% strain. For [123], [001] orientations, aluminiumadditions change the dislocation arrangement from a uniform distribution to a planar dislocation arrangment and also suppress twinning. Intersections of dislocation pile-ups were found to be the governing factor for hardening in the aluminium-Alloyed [001] crystals.

Original languageEnglish (US)
Pages (from-to)144-149
Number of pages6
JournalZeitschrift fuer Metallkunde/Materials Research and Advanced Techniques
Volume98
Issue number2
StatePublished - Feb 2007

Keywords

  • Hadfield steel
  • Microstructure
  • Single crystal
  • Stacking fault energy
  • Twinning

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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