TWIP effect and plastic instability condition in an Fe-Mn-C austenitic steel

Motomichi Koyama, Takahiro Sawaguchi, Kaneaki Tsuzaki

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The correlation among deformation twin density, work hardening, and tensile ductility was investigated in an Fe-18Mn-1.2C steel. The twin density was varied by changing tensile deformation temperature from 123 to 523 K. The deformation twin density at a 10% plastic strain decreased with increasing deformation temperature except for the condition (123K) in which martensitic transformation occurred. The work hardening rate at the early deformation stage decreased due to the reduction in the deformation twin density; however, the decrease in work hardening rate did not affect the uniform elongation. The uniform elongation was determined by a plastic instability condition. Thus, the important factor for the uniform elongation is the work hardening rate in the later deformation stage. Additionally, we discussed influences of dynamic strain aging and e-martensitic transformation which accelerated fracture.

Original languageEnglish
Pages (from-to)229-236
Number of pages8
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume98
Issue number6
DOIs
Publication statusPublished - 2012
Externally publishedYes

Keywords

  • Austenitic steel
  • Dynamic strain aging
  • High Mn steel
  • High carbon
  • Twinning induced plasticity
  • Work hardening

ASJC Scopus subject areas

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

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