Fatigue properties of nickel-base superalloy inconel 792-5A at 800°C

0354177 - ÚFM 2011 RIV CZ eng C - Conference Paper (international conference)
Šmíd, Miroslav - Obrtlík, Karel - Petrenec, Martin - Polák, Jaroslav - Hrbáček, K.
Fatigue properties of nickel-base superalloy inconel 792-5A at 800°C.
Metal 2010 - 19th international conference on metallurgy and materials. Ostrava: Tanger s.r.o, 2010, s. 1-6. ISBN 978-80-87294-15-4.
[Metal 2010. International Conference on Metallurgy and Materials /19./. Rožnov pod Radhoštěm (CZ), 18.05.2010-20.05.2010]
R&D Projects: GA ČR GA106/08/1631
Institutional research plan: CEZ:AV0Z20410507
Keywords : Inconel 792-5A * low cycle fatigue * high temperatures * fatigue life curves * dislocation structure
Subject RIV: JL - Materials Fatigue, Friction Mechanics

Smooth specimens were cyclically strained under strain control with constant strain amplitude and constant strain rate. Low cycle fatigue tests were conducted in servo-hydraulic pulsator MTS equipped with a three zone resistance furnace at temperature 800°C in air. Fracture surface was studied in SEM after fatigue test termination. Selected specimens were used to prepare foils for the transmission electron microscope (TEM) observation of microstructure and dislocation arrangement. They were used to obtain cyclic hardening/softening curves, cyclic stress-strain curve and fatigue life curves in the representation of stress amplitude, total strain amplitude and plastic strain amplitude versus number of cycles to fracture. Experimental points can be approximated with the Manson-Coffin law and the Basquin law. Fracture surface examinations revealed fatigue crack initiation sites.
Permanent Link: http://hdl.handle.net/11104/0193237