Yielding behavior and its effect on uniform elongation of fine grained if steel

Si Gao, Meichuan Chen, Shuai Chen, Naoya Kamikawa, Akinobu Shibata, Nobuhiro Tsuji

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

Interstitial free (IF) steel specimens with different mean grain sizes ranging from 0.4 to 12μm were fabricated by the accumulative roll bonding (ARB) process and subsequent annealing. Tensile tests at room temperature have revealed that by decreasing the mean grain size down to an ultra-fine range, the yielding behavior gradually changes from the continuous yielding to the discontinuous yielding, accompanying a yield drop phenomenon. It has been found that the yield stress of specimens having fine grain sizes shows extra-hardening, deviated from the original HallPetch relation for coarse-grained specimens in accordance with the discontinuous yielding. The HallPetch analysis also has indicated that the loss in the uniform elongation in the ultrafine grain size range is related to the appearance of the discontinuous yielding behavior.

Original languageEnglish
Pages (from-to)73-77
Number of pages5
JournalMaterials Transactions
Volume55
Issue number1
DOIs
Publication statusPublished - 2014

Keywords

  • HallPetch relationship
  • Plastic instability
  • Uniform elongation
  • Yield-drop
  • Yielding behavior

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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