Effect of tensile dwell on high-temperature low-cycle fatigue and fracture behaviour of cast superalloy MAR-M247

0482087 - ÚFM 2018 RIV GB eng J - Journal Article
Šulák, Ivo - Obrtlík, Karel
Effect of tensile dwell on high-temperature low-cycle fatigue and fracture behaviour of cast superalloy MAR-M247.
Engineering Fracture Mechanics. Roč. 185, NOV (2017), s. 92-100. ISSN 0013-7944. E-ISSN 1873-7315.
[ICMFM 2016 - International Colloquium on Mechanical Fatigue of Metals /18./. Gijón, 05.09.2016-07.09.2016]
R&D Projects: GA ČR(CZ) GA15-20991S
Institutional support: RVO:68081723
Keywords : Nickel-based superalloy * High-temperature low-cycle fatigue * Tensile dwell * Fatigue life * Damage mechanisms
OECD category: Audio engineering, reliability analysis
Impact factor: 2.580, year: 2017

Hot isostatically-pressed, nickel-based superalloy MAR-M247 was tested under fatigue and creep-fatigue conditions. Continuous cycling and cycling with 10 min tensile dwells in each cycle were applied in symmetrical strain control cycle with constant total strain amplitude at 900 °C in air. Cyclic hardening/softening curves, cyclic stress-strain curves and fatigue life curves were obtained. The introduction of tensile dwells resulted in lower fatigue life in total strain representation. Surface relief, specimen sections and fracture surface observations revealed crack initiation sites, crack density and crack paths, and help to clarify the effect of dwells on fatigue behaviour.
Permanent Link: http://hdl.handle.net/11104/0278857