EFFECT OF HIP ON LOW CYCLE FATIGUE OF MAR-M247 AT 900°C

0435004 - ÚFM 2015 RIV CZ eng C - Conference Paper (international conference)
Šulák, Ivo - Obrtlík, Karel - Škorík, Viktor - Hrbáček, K.
EFFECT OF HIP ON LOW CYCLE FATIGUE OF MAR-M247 AT 900°C.
METAL 2014: 23rd International Conference on Metallurgy and Materials. Ostrava: Tanger Ltd, 2014. ISBN 978-80-87294-52-9.
[METAL 2014. International Conference on Metallurgy and Materials /22./. Brno (CZ), 21.05.2014-23.05.2014]
R&D Projects: GA MŠMT(CZ) EE2.3.30.0063
Institutional support: RVO:68081723
Keywords : MAR-M-247 * High temperature * Low cycle fatigue
Subject RIV: JL - Materials Fatigue, Friction Mechanics

Polycrystalline nickel-base superalloy MAR-M247 is used for high temperature applications requiring excellent combination of fatigue properties, creep resistance and surface stability. These superior high temperature characteristics derive from the microstructure which habitually consists of face centred cubic matrix γ and precipitate γ´ (L12 type ordered structure). In the present work, the high temperature low cycle fatigue behaviour of cast nickel-base superalloy MAR-M247 in as received condition and in hot isostatically pressed (HIP) condition was studied. The microstructure of the materials is characterized by dendritic grains, carbides and casting defects. Distribution and size of defects in both materials were studied. Isothermal low cycle fatigue (LCF) tests were performed on cylindrical specimens under total strain control at 900°C in air. Cyclic stress–strain response and fatigue life of both materials were assessed. Beneficial effects of HIP process on cyclic stress-strain and fatigue life curves are discussed.
Permanent Link: http://hdl.handle.net/11104/0238924