0478100 - ÚFM 2018 RIV CH eng J - Journal Article
Järvenpää, A. - Jaskari, M. - Man, Jiří - Karjalalinen, L.P.
Stability of grain-refined reversed structures in a 301LN austenitic stainless steel under cyclic loading.
Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. Roč. 703, č. 4 (2017), s. 280-292. ISSN 0921-5093. E-ISSN 1873-4936
R&D Projects: GA ČR GA13-32665S
Institutional support: RVO:68081723
Keywords : austenitic stainless steel * reversion treatment * grain size * deformation induced martensite * strain-controlled fatigue
OECD category: Audio engineering, reliability analysis
Impact factor: 3.414, year: 2017

Austenite stability against the deformation induced alpha-martensite (DIM) formation and the cyclic deformation behavior of grain-refined structures with the grain size between 13 and 0.6 micrometer under fatigue loading were investigated in a 301LN Cr-Ni austenitic stainless steel. The DIM transformation in the course of cycling at constant total strain amplitudes of 0.4% and 0.6% was recorded by magnetic measurements and microstructures examined by electron backscatter diffraction and X-ray diffraction. The cyclic deformation behavior was followed by the evolution of the stress amplitude. The results evidenced that the austenite stability increases with the decreasing average grain size down to about one micrometer, obtained in annealing at 900 °C for 1 s. On the contrary, the stability decreases drastically in the submicron, non-homogeneous grain structures created at the lower temperatures of 800–700 °C. In these structures, submicron grains seem to be stable, and the precipitation of CrN is considered to contribute to the reduced stability of grains with a few-micron-size present among submicron grains. Under cyclic loading, the level of initial stress amplitude varied considerably in dependence on the refined austenite grain size. At the 0.6% strain amplitude, the initial softening was followed by cyclic hardening. The level of the final stress amplitude was related to the fraction of DIM formed during cycling straining.
Permanent Link: http://hdl.handle.net/11104/0274308