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 |
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Pages (from-to) | 303-311 |
Number of pages | 9 |
Journal | Philosophical Magazine Letters |
Volume | 95 |
Issue number | 6 |
DOIs | |
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