Room-temperature blue brittleness of Fe-Mn-C austenitic steels

Motomichi Koyama, Yusaku Shimomura, Aya Chiba, Eiji Akiyama, Kaneaki Tsuzaki

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Fe-33Mn-xC (x = 0, 0.3, 0.6, 0.8, and 1.1 mass%) fully austenitic steels showed ductility degradation owing to dynamic strain aging (DSA). The elongation increased with increasing carbon concentration at a strain rate of 10− 2 s− 1. However, in the steels with carbon contents of 0.6%, 0.8%, and 1.1%, the elongation decreased with increasing carbon concentration at a strain rate of 10− 5 s− 1 where the DAS effect is distinct. Although all specimens showed ductile fracture with the formation of dimples, the work hardening-true stress relation of the Fe-33Mn-1.1C steel demonstrated fracture before satisfying Considère's criterion even at high strain rates.

Original languageEnglish
Pages (from-to)20-23
Number of pages4
JournalScripta Materialia
Volume141
DOIs
Publication statusPublished - 2017 Dec

Keywords

  • Austenitic steel
  • Blue brittleness
  • Deformation twinning
  • Ductile fracture
  • Dynamic strain aging

ASJC Scopus subject areas

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

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