TY - JOUR

T1 - On the low-cycle fatigue response of pre-strained austenitic Fe 61Mn 24Ni 6.5Cr 8.5 alloy showing TWIP effect

AU - Lambers, H. G.

AU - Rüsing, C. J.

AU - Niendorf, T.

AU - Geissler, D.

AU - Freudenberger, J.

AU - Maier, H. J.

N1 - Funding information: The authors would like to thank M. Frey for the melt processing, D. Seifert for forging and drawing operations as well as A. Voß and A. Voidel for the chemical analysis, Mr. A. Kurtovic, Mr. M. Droste as well as Mr. J.T. Harting for performing the fatigue experiments. Mr. E. Djakow is thanked for doing the compressive deformation of the alloy, Mr. A. Grüning from the University of Kassel is acknowledged for carrying out the residual stress measurements. Financial support by Deutsche Forschungsgemeinschaft within the project “Optimierung des Ermüdungsverhaltens von TWIP-Stählen durch gezielte Vorverformung”, Contract No. NI 1327/1-1, is gratefully acknowledged.

PY - 2012/1/12

Y1 - 2012/1/12

N2 - The low-cycle fatigue behavior of a high manganese austenitic alloy showing TWIP (Twinning-Induced Plasticity) in its homogenized as-received (AsRec) and in pre-strained conditions was determined. Pre-strains were applied both in tension and compression. The fatigue experiments, conducted in total strain control under fully reversed push-pull loading, were accompanied by thorough microstructural investigations utilizing electron backscatter diffraction and transmission electron microscopy. The results clearly lay out the different microstructural evolutions during cyclic loading of the AsRec and the pre-deformed conditions. Cyclic hardening prevails for the AsRec condition due to the increase in dislocation density and the subsequent rearrangement of dislocations into labyrinth and cell structures upon further cycling, whereas pronounced softening accompanied by a decrease in absolute value of mean stress dominated the cyclic deformation response of the pre-deformed conditions.

AB - The low-cycle fatigue behavior of a high manganese austenitic alloy showing TWIP (Twinning-Induced Plasticity) in its homogenized as-received (AsRec) and in pre-strained conditions was determined. Pre-strains were applied both in tension and compression. The fatigue experiments, conducted in total strain control under fully reversed push-pull loading, were accompanied by thorough microstructural investigations utilizing electron backscatter diffraction and transmission electron microscopy. The results clearly lay out the different microstructural evolutions during cyclic loading of the AsRec and the pre-deformed conditions. Cyclic hardening prevails for the AsRec condition due to the increase in dislocation density and the subsequent rearrangement of dislocations into labyrinth and cell structures upon further cycling, whereas pronounced softening accompanied by a decrease in absolute value of mean stress dominated the cyclic deformation response of the pre-deformed conditions.

KW - Dislocation cells

KW - LCF

KW - Microstructure

KW - Pre-deformation

KW - Twinning

UR - http://www.scopus.com/inward/record.url?scp=84858078410&partnerID=8YFLogxK

U2 - 10.1016/j.ijfatigue.2012.01.002

DO - 10.1016/j.ijfatigue.2012.01.002

M3 - Article

AN - SCOPUS:84858078410

VL - 40

SP - 51

EP - 60

JO - International journal of fatigue

JF - International journal of fatigue

SN - 0142-1123

ER -