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

doi:10.1080/09500839.2015.1052029

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 journal › Article › peer-review

19 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 language	English
Pages (from-to)	303-311
Number of pages	9
Journal	Philosophical Magazine Letters
Volume	95
Issue number	6
DOIs	https://doi.org/10.1080/09500839.2015.1052029
Publication status	Published - 2015 Jun 3
Externally published	Yes

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

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.",

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AU - Koyama, Motomichi

AU - Sawaguchi, Takahiro

AU - Tsuzaki, Kaneaki

AU - Noguchi, Hiroshi

PY - 2015/6/3

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