0385840 - ÚFM 2013 RIV CZ eng C - Conference Paper (international conference)
Tobiáš, Jiří - Chlupová, Alice - Petrenec, Martin - Polák, Jaroslav
Low Cycle Fatigue and Analysis of the Cyclic Stress-strain Response in Superalloy Inconel 738LC.
Proceedings of Engineering Mechanics 2012. Praha: Institute of Theoretical and Applied Mechanics AS CR, v.v.i, 2012 - (Náprstek, J.; Fischer, C.), s. 1407-1411. ISBN 978-80-86246-40-6.
[Engineering Mechanics 2012 /18./. Svratka (CZ), 14.05.2012-17.05.2012]
R&D Projects: GA ČR(CZ) GAP204/11/1453
Institutional support: RVO:68081723
Keywords : low cycle fatigue * Inconel 738LC * hardening/softening curves * cyclic stress-strain curve * fatigue life curve
Subject RIV: JL - Materials Fatigue, Friction Mechanics
Result website:
http://www.engmech.cz/2012/proceedings/

The paper describes the results of fatigue behavior study on cast polycrystalline nickel based superalloy tested at 23 and 800 °C. Cylindrical specimens of Inconel 738LC were cyclically strained under total strain control to fracture and multiple step tests were performed to study the effect of temperature on the internal and effective cyclic stress components. Fatigue life curves were approximated by the Manson- Coffin and Basquin laws. The resulting curves were shifted to lower fatigue lives with increasing temperature. The evolution of the effective and internal stress components and effective elastic modules were derived from the hysteresis loops which were analyzed according to the statistical theory of hysteresis loop. Cyclic stress-strain response at both temperatures and the changes of internal and effective stress components were discussed in relation to microstructural parameters of the superalloy.
Permanent Link: http://hdl.handle.net/11104/0216718