Formation mechanism of dislocation patterns under low cycle fatigue of a high-manganese austenitic TRIP steel with dominating planar slip mode

Formation mechanism of dislocation patterns under low cycle fatigue of a high-manganese austenitic TRIP steel with dominating planar slip mode

We investigated the evolution of dislocation patterns under low cycle fatigue in a Fe–17Mn-1.5Al-0.3C (wt. %) steel with transformation-induced plasticity (TRIP). To this end, quasi in-situ electron channelling contrast imaging under controlled diffraction conditions (cECCI) was employed. Cross-corr...

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Veröffentlicht in:International journal of plasticity 2019-10, Vol.121, p.244-260
Hauptverfasser: An, Dayong, Zaefferer, Stefan
Format: Artikel
Sprache:eng
Schlagworte:
Angular resolution
Austenitic stainless steels
CC-EBSD
Cross slip
Dipoles
Dislocations
ECCI
Electron backscatter diffraction
Electron channelling
Low cycle fatigue
Manganese
Metal fatigue
Planar slip
Stacking fault energy
Strain
Stress concentration
TRIP
TRIP steels
Walls
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Zusammenfassung:We investigated the evolution of dislocation patterns under low cycle fatigue in a Fe–17Mn-1.5Al-0.3C (wt. %) steel with transformation-induced plasticity (TRIP). To this end, quasi in-situ electron channelling contrast imaging under controlled diffraction conditions (cECCI) was employed. Cross-correlation based electron backscattering diffraction (CC-EBSD) with high angular resolution was applied to measure the distributions of residual strain/stress and geometrically necessary dislocations (GNDs). Planar slip mode was found to be dominating in this low stacking fault energy (SFE) steel under the small strain amplitudes that were applied here (
ISSN:0749-6419
1879-2154
DOI:10.1016/j.ijplas.2019.06.009