Název:
EFFECT OF HIP ON LOW CYCLE FATIGUE OF MAR-M247 AT 900°C
Autoři:
Šulák, Ivo ; Obrtlík, Karel ; Škorík, Viktor ; Hrbáček, K. Typ dokumentu: Příspěvky z konference Konference/Akce: METAL 2014. International Conference on Metallurgy and Materials /22./, Brno (CZ), 2014-05-21 / 2014-05-23
Rok:
2014
Jazyk:
eng
Abstrakt: 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.
Klíčová slova:
High temperature; Low cycle fatigue; MAR-M-247 Číslo projektu: EE2.3.30.0063 Poskytovatel projektu: GA MŠk Zdrojový dokument: METAL 2014: 23rd International Conference on Metallurgy and Materials, ISBN 978-80-87294-52-9
Instituce: Ústav fyziky materiálů AV ČR
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Informace o dostupnosti dokumentu:
Dokument je dostupný v příslušném ústavu Akademie věd ČR. Původní záznam: http://hdl.handle.net/11104/0238924