Cyclic plasticity and cyclic creep in austenitic-ferritic duplex steel

0370009 - ÚFM 2012 RIV CH eng J - Journal Article
Polák, Jaroslav - Petrenec, Martin - Man, Jiří - Kruml, Tomáš
Cyclic plasticity and cyclic creep in austenitic-ferritic duplex steel.
Key Engineering Materials. Roč. 465, - (2011), s. 431-434. ISSN 1013-9826.
[Materials Structure & Micromechanics of Fracture VI. Brno, 28.05.2010-30.06.2010]
R&D Projects: GA ČR GA101/07/1500
Institutional research plan: CEZ:AV0Z20410507
Keywords : duplex steel, * mean stress * cyclic creep * cyclic plasticity
Subject RIV: JL - Materials Fatigue, Friction Mechanics

Smooth specimens made from austenitic-ferritic duplex steel were subjected to constant stress amplitude loading with positive mean stresses. Hysteresis loops were recorded during the fatigue life and plastic strain amplitude and cyclic creep rate were determined. Fatigue hardening/softening curves, cyclic creep curves and cyclic stress-strain curves for different positive mean stresses were evaluated. Typical dislocation structures developed in both phases of the duplex steel were identified using TEM, compared with the saturated plastic strain amplitude and correlated with the decrease of the cyclic creep rate during cycling and the slope of the cyclic stress-strain curve.
Permanent Link: http://hdl.handle.net/11104/0203932