In situ neutron diffraction study of the low cycle fatigue of the alpha-gamma duplex stainless steel

0048319 - ÚJF 2007 RIV DE eng J - Journal Article
Lukáš, Petr - Muránsky, Ondrej - Polák, Jaroslav - Jenčuš, Peter
In situ neutron diffraction study of the low cycle fatigue of the alpha-gamma duplex stainless steel.
[In situ neutronová difrakční studie nízkocyklové únavy v alfa-gama duplexni nerezové oceli.]
Zeitschrift für Kristallographie. Roč. 23, č. 2 (2006), s. 357-362. ISSN 0044-2968
R&D Projects: GA AV ČR IAA1048107; GA AV ČR IAA2041201; GA ČR GA202/03/0891
Institutional research plan: CEZ:AV0Z10480505; CEZ:AV0Z20410507
Keywords : neutron diffraction * fatique * duplex steel
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 1.897, year: 2006

The mechanism of the low cycle fatigue in alpha-gamma duplex stainless steel was examined by the neutron diffraction technique performed in situ upon mechanical exposure consisting of the tension-compression cycles with the strain amplitude of 0.8 %. Deformation response of both constituent components, i.e. ferrite and austenite, was studied in situ during the individual applied cycle in detail. Furthermore, the evolution of the residual strains in both phases after tensile and compressive unloading was monitored during cycling. Information on the evolution of lattice strains and microstrains has been obtained from the diffraction profiles collected during the fatigue experiment. The results show different deformation behavior and hardening of austenite and ferrite. The evolution of internal stresses and residual stresses detected in both phases during individual cycles is strongly affected by initial stresses present in both phases.

Výsledky difrakčního experimentu provedeného in situ v průběhu nizkocyklového namáhání přinesly informace o vývoji makroskopického i mikroskopického napětí v obou fázích duplexni oceli a přispěly k popisu únavových mechanismů v tomto materiálu.
Permanent Link: http://hdl.handle.net/11104/0138979