Importance of crack-propagation-induced ε-martensite in strain-controlled low-cycle fatigue of high-Mn austenitic steel

Huichao Li, Motomichi Koyama, Takahiro Sawaguchi, Kaneaki Tsuzaki, Hiroshi Noguchi

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

We investigated the roles of deformation-induced ε-martensitic transformation on strain-controlled low-cycle fatigue (LCF) through crack-propagation analysis involving a notching technique that used a focused ion beam (FIB) setup on Fe-30Mn-4Si-2Al austenitic steel. Using the FIB notch, we separated the microstructure evolution into macroscopic cyclic deformation-induced and crack-propagation-induced microstructures. Following this, we clarified the fatigue crack-propagation-induced ε-martensitic transformation to decelerate crack propagation at a total strain range of 2%, obtaining an extraordinary LCF life of 1.1 × 104 cycles.

Original languageEnglish
Pages (from-to)303-311
Number of pages9
JournalPhilosophical Magazine Letters
Volume95
Issue number6
DOIs
Publication statusPublished - 2015 Jun 3
Externally publishedYes

Keywords

  • fatigue
  • focused ion beam
  • high-Mn austenitic steel
  • low-cycle fatigue
  • martensitic transformations
  • reversible transformation-induced plasticity

ASJC Scopus subject areas

  • Condensed Matter Physics

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