LCF behaviour of 301LN steel: coarse-grained vs. UFG-bimodal structure

0478103 - ÚFM 2018 RIV DE eng C - Conference Paper (international conference)
Man, Jiří - Chlupová, Alice - Kuběna, Ivo - Kruml, Tomáš - Man, O. - Järvenpää, A. - Karjalainen, L. P. - Polák, Jaroslav
LCF behaviour of 301LN steel: coarse-grained vs. UFG-bimodal structure.
LCF8 Eighth International Conference on Low Cycle Fatigue. Berlin: DVM e.V., 2017 - (Beck, T.; Charkaluk, E.), s. 205-210. ISBN 978-3-9814516-5-8.
[LCF8 Eighth International Conference on Low Cycle Fatigue /8./. Dresden (DE), 27.06.2017-29.06.2017]
R&D Projects: GA ČR GA13-32665S
Institutional support: RVO:68081723
Keywords : low cycle fatigue * 301LN austenitic stainless steel * UFG microstructure * reversion annealing * deformation induced martensite
OECD category: Audio engineering, reliability analysis

Low-cycle fatigue (LCF) behaviour of metastable austenitic 301LN steel with different grain sizes – coarse-grained (14 µm) and UFG (1.4 µm) with a grain bimodality – produced by reversion annealing (RA) was investigated. Symmetrical push-pull LCF tests were conducted on flat sheet specimens at room temperature with constant strain rate of 2×10–3 s–1 and constant total strain amplitude ranging from 0.4% to 0.8%. After completion of fatigue tests a ferritescope was adopted for quantitative assessment of volume fraction of deformation induced martensite (DIM). Microstructural changes, distribution and morphology of DIM in the volume of material were characterized at different scales by colour etching, TEM and EBSD techniques. Experimental data on microstructural changes are confronted with the stress-strain response and with the chemical heterogeneity present in the material.
Permanent Link: http://hdl.handle.net/11104/0278867