Microstructure and martensitic transformation in 316L austenitic steel during multiaxial low cycle fatigue at room temperature

0508508 - ÚFM 2020 RIV CH eng J - Journal Article
Mazánová, Veronika - Heczko, Milan - Škorík, Viktor - Chlupová, Alice - Polák, Jaroslav - Kruml, Tomáš
Microstructure and martensitic transformation in 316L austenitic steel during multiaxial low cycle fatigue at room temperature.
Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. Roč. 767, NOV (2019), č. článku 138407. ISSN 0921-5093. E-ISSN 1873-4936
R&D Projects: GA MŠMT LM2015069; GA MŠMT(CZ) LQ1601; GA ČR(CZ) GA18-03615S
Institutional support: RVO:68081723
Keywords : Austenitic steel * Multiaxial fatigue * Secondary hardening * α′-martensite * Transmission electron microscopy
OECD category: Materials engineering
Impact factor: 4.652, year: 2019
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0921509319311931?via%3Dihub

Austenitic stainless 316L steel in cold worked condition was subjected to torsional cyclic loading with equivalent
strain amplitudes of 0.3% and 0.4% and multiaxial (in-phase and out-of-phase) cyclic loading with equivalent
strain amplitude of 0.35% at room temperature. Cyclic plastic response has been measured and analyzed.
Internal structure in the as-received state was compared with the deformation microstructures that developed
during cyclic straining with various strain histories. In all three investigated cases the volumes with dislocation
structures corresponding to cyclic strain localization (persistent slip bands, irregular wall and channel structures)
were found. In addition, also islands of deformation induced α′-martensite were observed. Transmission
electron microscopy, selected area electron diffraction and ferritscope measurements allowed to estimate the
fraction and distribution of α′-martensite islands. The shape of fatigue hardening/softening curves has been
discussed in relation with the localization of cyclic plastic strain in the low energy dislocation structures and its
blockade by the islands of α′-martensite.
Permanent Link: http://hdl.handle.net/11104/0301456