University of Oulu

Man, Jiří; Järvenpää, Antti; Jaskari, Matias; Kuběna, Ivo; Fintová, Stanislava; Chlupová, Alice; Karjalainen, L. Pentti; Polák, Jaroslav (2018) Cyclic deformation behaviour and stability of grain-refined 301LN austenitic stainless structure. In: 12th International Fatigue Congress (FATIGUE 2018) Volume 165, 2018, 06005.

Cyclic deformation behaviour and stability of grain-refined 301LN austenitic stainless structure

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Author: Man, Jiří1; Järvenpää, Antti2; Jaskari, Matias2;
Organizations: 1Institute of Physics of Materials ASCR, Žižkova 22, 616 62 Brno, Czech Republic
2Kerttu Saalasti Institute, University of Oulu, Pajatie 5, 85500 Nivala, Finland
3Centre for Advanced Steels Research, University of Oulu, P.O. Box 4200, 90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.9 MB)
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Language: English
Published: EDP Sciences, 2018
Publish Date: 2018-09-21


Low cycle fatigue (LCF) behaviour of metastable austenitic 301LN stainless steel with different grain sizes — coarse-grained (13 μm), fine-grained (1.4 μm) and ultrafine-grained (0.6 μm) — produced by reversion annealing after prior cold rolling was investigated. Fully symmetrical LCF tests with constant total strain amplitudes of 0.5% and 0.6% were performed at room temperature with a low constant strain rate of 2×10⁻³ s⁻¹. Microstructural changes in different positions within the gauge part of the specimens were examined by optical microscopy (polarized light) and electron backscatter diffraction (EBSD) technique; for quantitative assessment of the volume fraction of deformation induced martensite (DIM) a Feritscope FMP 30 was adopted. The cyclic stress-strain response and specific changes of hysteresis loop shapes in the very early stage of cycling are confronted with the character of DIM formation and its distribution in the whole volume of the material. A possible effect of strain rate (frequency of cycling) on the destabilization of austenitic structure during cyclic straining of materials with different grain sizes is highlighted.

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Series: MATEC web of conferences
ISSN: 2261-236X
ISSN-E: 2261-236X
ISSN-L: 2261-236X
Volume: 165
Article number: 06005
DOI: 10.1051/matecconf/201816506005
Host publication: 12th International Fatigue Congress, FATIGUE 2018
Conference: International Fatigue Congress
Type of Publication: A4 Article in conference proceedings
Field of Science: 216 Materials engineering
Funding: The support of the present work by the grant No. 13-32665S from GAČR and by the research project RVO 68081723 is gratefully acknowledged.
Copyright information: © The Authors, published by EDP Sciences, 2018. This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (